Mott scattering Research Papers

Electron elastic scattering off high spin atoms: the Cr and Mn case

2025

The Cr (...3d5 4s1, 7S) and Mn(...3d5 4s2 , 6 S) atoms belong to the cohort of high spin atoms, owing to their semifilled 3d5 and 4s1 (in Cr) subshells. The current understanding of low-energy electron scattering off such atoms is... more

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Dynamical scattering effects in electron scattering measurements of the Compton profiles of solids

by Brian Williams

2025, Proceedings of the Royal Society of London

In electron scattering measurements of the Compton profiles of solids, multiple scattering events contribute strongly to the observed profile. The dom inant contribution to the multiple scattering arises from events in which Bragg... more

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Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from C12 and Al27

by D. Androić

2025, Physical Review C

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Transverse beam spin asymmetries at backward angles in elastic electron-proton and quasielastic electron-deuteron scattering

by D. Androić

2025, Physical Review Letters

We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasielastic scattering on the deuteron, at backward angles (lab... more

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Theoretical Evaluation on Inelastic Lepton Scattering of Nuclear Effects

by Yakubu H Ngadda

2025, Perfiles

Inelastic scattering is a process in which the kinetic energy of an incident particle is not conserved due to the interaction between an electron and a photon causing an unstable nuclear state. Upon the interaction of the incident photon... more

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Electron elastic scattering off a spin-polarized Cr atom

by Larissa V L A D . Chernysheva

2024, Physical Review A

Electron elastic scattering off a spin-polarized Cr(...3d 5 4s 1 , 7 S) atom is theoretically studied in the region of electron energies up to 15 eV using both a one-electron "spin-polarized" Hartree-Fock and multielectron... more

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Uncovering electron scattering mechanisms in NiFeCoCrMn derived concentrated solid solution and high entropy alloys

by German Samolyuk

2024, npj computational materials

Whilst it has long been known that disorder profoundly affects transport properties, recent measurements on a series of solid solution 3d-transition metal alloys reveal two orders of magnitude variations in the residual resistivity. Using... more

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Uncovering electron scattering mechanisms in alloys possessing extreme disorder

by German Samolyuk

2024, arXiv (Cornell University)

Whilst it has long been known that disorder profoundly affects transport properties, recent measurements on a series of solid solution 3d-transition metal alloys reveal two orders of magnitude variations in the residual resistivity. Using... more

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On the character of the scattering of wide-band x-ray radiation in the low-temperature phase of 2H-NbSe2

by Valentyna Sirenko

2024, Low Temperature Physics

The intensity of x-ray scattering in the layered metal 2H-NbSe2 has been investigated experimentally in the temperature range below the temperature of the transition into the charge-density wave state. It is shown that the relation... more

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Quantitative treatment for extracting coherent elastic scattering from X-ray scattering experiments

by Stefan Kycia

2024, Journal of Applied Crystallography

A fitting procedure for separating the inelastic and elastic contributions to the total scattering in diffuse-scattering experiments at high energy using energy-dispersive X-ray techniques is presented. An asymmetric peak function is used... more

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Scattering Cross Sections in Electron Microscopy and Analysis

by Peter Rez

2024, Microscopy and Microanalysis

The scattering cross section is the fundamental measure of the strength of a scattering interaction. All scattering in electron microscopy arises from the Coulomb interaction, and scattering cross sections, whether elastic or inelastic,... more

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Spin dependent 2D electron scattering by nanomagnets

by Teshome Senbeta

2024, Journal of Magnetism and Magnetic Materials

The 2D scattering problem of an electron by a magnetized nanoparticle is solved in the Born approximation with account of the dipole-dipole interaction of the magnetic moments of electron and nanomagnet. The scattering amplitudes in this... more

Fig. 1. The coordinate systems: (x,z) and (x’,z’). The x’ axis is parallel to q.

The dimensionless factor qa in I, and Iz compensates divergence of these integrals at qa— zero. To obtain the spin-dependent scattering amplitudes in the original coordinate system, we have to rotate the spinors in (19) hv —~/?:

Fig. 3. The dimensionless differential scattering length L2 versus ka and ¢ (in radians). The graph clearly shows anisotropy of the scattering with respect to the scattering angle ¢. Fig. 2. The dimensionless differential scattering length L; versus ka and ¢ (in radians). The graph clearly shows anisotropy of the scattering with respect to the scattering angle ¢.

Figs. 5-7 show the differential scattering lengths as functions of @ at ka=0.2. In this case, the wave length of incident electrons considerably exceeds the size of nanomagnets, 2 = 10za > a. With

Fig. 4. The dimensionless differential scattering length L3 versus ka and ¢ (in radians). The graph clearly shows anisotropy of the scattering with respect to the scattering angle ¢.

Fig. 5. The dimensionless differential scattering length L; versus ~ at ka=0.2.

Fig. 6. The dimensionless differential scattering length [2 versus ~ at ka=0.2.

Fig. 7. The dimensionless differential scattering length L3 versus ~ at ka=0.2. L, at p~3 rad and ka=0.5. But it is five times smaller than the probability of forward scattering. Fig. 7 relates to the scattering with spin flipping for the initial velocity of e initial velocity of electrons parallel to i. For the ectrons is perpendicular to ji, it describes the non-spin flipping scattering. The position of maxima of graph Fig. 6 corresponds to the position of minima of Fig. 7. The maxima of [3 located near ~ = 7/2 and 37/2. For example, the scattered electrons with flipped spin initially moving along fi are concentrated in the direction transversa to their initial velocity. The scattered electrons with their spin flipped and initially moving perpendicular to fi are concentrated at small scattering angles.

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2D scattering of unpolarized beams of electrons by charged nanomagnets

by Teshome Senbeta

2024, Journal of Magnetism and Magnetic Materials

2D spin-dependent scattering of slow unpolarized beams of electrons by charged nanomagnets is analyzed in the Born approximation. The obtained scattering lengths are larger than those from the neutral nanomagnets approximately by one... more

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Joint theoretical and experimental study on elastic electron scattering from bismuth

by FRANCISCO BLANCO RAMOS

2024, Physical Review A

We report on experimental elastic differential and integral cross sections for electron scattering from bismuth. The energy range of those measurements is 10-100 eV, while the scattered electron angular range in the differential cross... more

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Quantitative Test of the Evolution of Geant4 Electron Backscattering Simulation

by Gabriela Hoff

2024, IEEE Transactions on Nuclear Science

Evolutions of Geant4 code have affected the simulation of electron backscattering with respect to previously published results. Their effects are quantified by analyzing the compatibility of the simulated electron backscattering fraction... more

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Candida albicans diskitis after body piercing in an immunocompetent patient

by Lucia Perez

2024, Joint Bone Spine

under treatment, even if reduced seroprotection after pandemic H1N1 influenza adjuvant-free vaccination has been observed [5].

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Elastic and inelastic scattering ofO16andO18ions fromZn64at energies near the Coulomb barrier

by Maria José Bechara

2024, Physical Review C

Coulomb-nuclear interference effects were investigated in the inelastic scattering of 0 and 0 by Zn. Measurements of elastic and inelastic angular distributions of 0 were performed at a laboratory energy of 49 MeV, over the angular range... more

FIG. 1. Spectrum of backscattered particles from the elas- tic and inelastic collision of '*O with ®*Zn at Fiap = 42.5 MeV, measured with a cooled annular surface barrier silicon detector. For the angular distribution measurements, a split- pole magnetic spectrograph [15, 16] was employed. The scattered ions were detected in a gas-filled E-AE po- sition sensitive detector with a delay line readout [17, 18], placed in the focal plane of the spectrograph. The position resolution, corresponding to an energy resolu- tion of approximatelly 140 keV, is mainly due to target thickness, and was adequate to completely resolve the

FIG. 2. Spectrum of backscattered particles from the elas- tic and inelastic collision of 18O with **Zn at Ela» = 42.5 MeV, measured with a cooled annular surface barrier silicon detector.

FIG. 3. Mass identification of products from '*O + °*Zn at Ejap = 49 MeV, measured with a position sensitive gas detector at the focal plane of the magnetic spectrograph at Mab = 60°. Groups of particles corresponding to masses 16, 17, and 18 are clearly separated. Two charge states (q = 7* and q = 8*) are detected in the range of magnetic rigidities covered by the detector. inelastic groups. Three parameter data (particle energy E, partial energy loss AE, and particle position P along the focal plane) were stored in the computer and were recorded event by event on magnetic tapes for off-line analysis. The simultaneous determination of FE, AE, and P allowed for a clear separation of masses 16, 17, and 18 of the oxygen ions. In particular, ®*Zn(80,!70)®Zn reaction products could be separated from the inelastic groups under study. A typical two-dimensional plot of E versus P is shown in Fig. 3. Groups of detected particles (A = 16, 17, and 18) are clearly separated from each other. The projected position spectrum for the 18O group is presented in Fig. 4. Two silicon detectors sym- metrically placed at 9,,5 = 30° with respect to the beam

FIG. 4. Projected position spectrum for the '*O group ex- tracted from the two-dimensional spectrum presented in Fig.

with the mass number and the atomic number of the projectile and of the target designated by (Ai, 2 ) and (Ag, Z2), respectively.

FIG. 5. Angular distributions for the elastic and inelastic scattering of 180 from ®*Zn measured at Elan = 49 MeV. The solid curves result from coupled-channels calculations with the coupling schemes shown in the inserts. The dashed lines are the result from DWBA calculations. The theoretical cross sections were obtained using the parameters presented in Ta- bles I and II.

FIG. 6. Excitation functions for the elastic and inelas- tic scattering of 1°O from °*Zn measured at Oc.m. = 175.6°. The solid curves result from optical model (elastic) and from DWBA (inelastic) calculations with the parameters presented in Tables I and II.

FIG. 8. Excitation functions for the elastic scattering of 189 and '®O from °*Zn measured at backward angles. The solid curves are theoretical calculation results with the optical model parameters presented in Table I.

FIG. 9. Excitation functions for the inelastic excitation of the lowest 2+ state in °*Zn by 1®O and '%O. The solid curves are the results of DWBA calculations with the parameters given in Tables I and II.

TABLE II. Nuclear and Coulomb deformation parameters used in the calculations. *B(E2)t = [2 ZeRc]’ [6FRc]*, Re = 1.25A'/ (fm). Reference [11]. *Reference (25].

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Elastic scattering of 9Li on 208Pb at energies around the Coulomb barrier

by Luis Martín Acosta

2024, AIP Conference Proceedings

We have studied the dynamical effects of the halo structure of 11 Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC-II at TRIUMF with a world record in production of the... more

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Low energy electron scattering from polyatomic targets

by Helen Silva

2024, Journal of Physics: Conference Series

Until recently the principal barrier to the accurate theoretical description of electronic collisions with polyatomic molecules was the problem of scattering by a nonlocal potential which is arbitrarily asymmetric. The last five or six... more

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2D scattering of unpolarized beams of electrons by charged nanomagnets

by Teshome Debela

2024, Journal of Magnetism and Magnetic Materials

2D spin-dependent scattering of slow unpolarized beams of electrons by charged nanomagnets is analyzed in the Born approximation. The obtained scattering lengths are larger than those from the neutral nanomagnets approximately by one... more

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Comparison between the Theoretical Calculation of Coulomb Form Factors and Experimental Data for 12C and 20Ne Nuclei

by Hawar Dlshad

2024, Ukrainian Journal of Physics

The Coulomb form factors for the elastic and inelastic electron-nucleus scatterings have been calculated for 12C and 20Ne nuclei in the ground and excited states with the same parity. We use a microscopic theory involving the effects from... more

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Alpha-4 He Elastic Scattering with halo Effective Field Theory at Low Energy

by mohsen khansari

2024

In the present work, we studied the α- 4He particle elastic scattering by measuring cross section with halo Effective Field Theory (hEFT) at low energies. In this article, we considered α- 4He elastic scattering in S-wave state at the... more

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Elastic electron scattering from some light nuclei

by Adel Khalaf Hamoudi

2023

The effects of the two-body short range correlation (SRC) and the occupation probability (η) of higher states on the elastic electron scattering longitudinal form factors F (q) are investigated. Considering the effect of higher occupation... more

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Observation of Forbidden Brillouin Scattering near an Exciton Resonance

by Emil Koteles

2023, Physical Review Letters

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Estimation of Inelastic Longitudinal Electron Scattering Form Factors in 58,60Ni Nuclei Using OXBASH Code

by Adie Salman

2023, Journal of Nuclear Sciences

Many effective interactions have been developed to provide a better understanding of the nuclear properties by starting with the realistic nucleon-nucleon (NN) interaction and using quantum-mechanical many-body theory. In this study, the... more

Fig. 2 Inelastic longitudinal form factors for the transition to the 2} state in the *°Ni nucleus using M3Y interaction, the experimental values are extracted from Ref, [24] Fig. 1 Inelastic longitudinal form factors for the transition to the 2} state in the *Ni nucleus using MSDI interaction, the experimental values are extracted from Ref, [24]

Fig. 3 Inelastic longitudinal form factors for the transition to the 2} state in the Ni nucleus using MSDI interaction, the experimental values are extracted from Ref, [24]

Fig. 4 Inelastic longitudinal form factors for the transition to the 2} state in the Ni nucleus using M3Y interaction, the experimental values are extracted from Ref, [24]

Fig. 5 Inelastic longitudinal form factors for the transition to the 4f state in the Ni nucleus using MSDI interaction, the experimental values are extracted from Ref. [24]

Fig. 6 Inelastic longitudinal form factors for the transition to the 4} state in the Ni nucleus using M3Y interaction, the experimental values are extracted from Ref, [24]

Table 1. The values of the reduced transition probabilities B(C2) (in unit e2.fm4) for The **Ni nucleus in comparison with the experimental data Table 2. The OBDM values for C2 transition in *8Ni

Table 4. The OBDM values for the C2 transition in ©Ni.

Table 3. The values of the reduced transition probabilities B(C2) (in unit e*.fm*) for the ©°Ni nucleus in comparison with the experimental data

Table 5. The values of the reduced transition probabilities B(C4) (in unit e”.fm®) for The ®°Ni nucleus in comparison with the experimental data Table 6. The OBDM values for the C4 transition in ©Ni.

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Elastic and Inelastic Electron Scattering by He and Ne Atoms in Their Ground States

by Carlos Bunge

2023, Physical Review

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Effect of electron spin polarization in laser-assisted electron–proton scattering

by Bouzid Manaut

2023, Chinese Journal of Physics

This work aims to study theoretically the electron-proton scattering for initially spin-polarized electrons in the presence of a circularly polarized electromagnetic field. Using the first Born approximation and the Dirac-Volkov states... more

Figure 1: Electron-proton scattering in the laboratory system, with A” is the four-potential produced by the proton. En.m and Sm represent the energy and the spin of the particles respectively. At the leading order, the matrix element Sy; representing our scattering process is: with A(x) = A,,(x)7y", where A,, is the electromagnetic 4-potential of the scattering given by:

After this detailed theoretical treatment of elastic e-p scattering in the presence of a laser field and for electrons of well-defined spin polarization, we will now present the different numerical results of this work. The geometry that has been found to give good results is one with spherical angles of 0; = pi = 15° and yy = 105°. The final angle 6 is varied from —180° to 180° to reveal the angular distribution of the DCS. The incident elecron kinetic energy is (unless otherwise stated) T; = 2.7 keV. The direction of the electromagnetic field is that represented by the wave vector k; it is chosen along the axis (Oz). We start with the first result in which the element do’/dQ;(A1, A3) of | represents the DCS of each number of photons exchanged. Eq. (38) Figure 2: Differential cross section do /dQ,(1, A3) for spin-flip (Ay = —A3 = 1) and spin non-flip (Ay = A3 = 1) as a function of the number of photons exchanged ¢. The scattering final angle is 6, =0°. The field strength ¢9 and frequency hw are indicated above each figure.

Figure 3: Variation of the summed laser-assisted DCS (38) for polarized electrons as a function of the scattering angle 0; for different summations over ¢. The notation = +i means that we have summed over —i < £ < +44. Fig. 2 gives information about the number of possible photons to be exchanged during the scat- tering process, treating the two cases of polarization of spins initially defined in spin Up (A; = 1). For a laser field frequency iw = 1.17 eV and strength eg = 5 x 10° V/cm, the DCS, do" /dQ-(A1, A3); in the two Figs. 2A and 2B for spin non-flip and spin-flip varies in magnitude for the same number of photons exchanged —3 < @< 3. This result is also seen by comparing Fig. 2C with Fig. 2D when the strength of the same laser field increases to ¢) = 10’ V/cm, but now the number of photons exchanged ¢ varies from —5 to 5. We notice that by increasing the field strength the number of possible exchanged photons becomes larger. This number of photons exchanged ¢ corresponds to non-zero values of DCS, while the DCS becomes zero from some values higher than @ in absolute value (the number of exchanged photons ¢ depends strongly on the laser field strength). This value rom which the DCS cancels is called the cutoff of the multiphoton scattering process. For a value | greater than the cutoff, the summed laser-assisted DCS (38) becomes equal to its corresponding one in the absence of the field. Then, we say that the laser assisted process verifies the sum rule Oormulated as follows:

Figure 4: Variation of (A) spin non-flip and (B) spin-flip DCSs as a function of the laser field strength for different laser frequencies. to the spin-flip DCS. In Fig. 4, we plot the curves representing the values given in table 1, with the addition of another laser type (He:Ne) of frequency 2 eV. We notice that the frequency of the laser field can change the variation of the DCS with respect to ¢9 for both cases of spin polarization. We also observe that for the COg laser, the effect of the DCS is very important. By comparing between the DCSs in the spin-flip and non-flip cases, both figures show that they have the same decrease by varying the strength €9. So, if there is a difference between these two polarizations, it will be small. From Fig. 4, it appears that the laser field effect diminishes at higher frequencies. Finally, we

Figure 5: Variation of the laser-assisted degree of polarization (DP) as a function of the field strength for different frequencies and for electrons initially in (A) spin Up and (B) spin Down.

Figure 6: Degree of polarization without laser as a function of scattering angle 6 for different incident electron kinetic energies. The electron is considered to be initially in spin Up (‘). in the case of a CO2 pulsed laser, while it remains almost constant for other lasers. At the end, we conclude that the elastic e-p scattering process of initially well-defined electron spin assisted by laser field of frequency fw = 0.117 eV is more probable for the scattering of non-flip electrons than for flip ones. Also, we conclude, as in [9], that the degree of polarization is weak depending on the number of photons exchanged .

The incident particle flux is |Jinc.| = |Pilc?/(E1V). To integrate with respect to d?p4, we will use the following formula: The spin projection operator d(S ) verifies the following property:

In the first Born approximation, using Feynman’s rules and after a simple treatment, we express Sf; in the presence of an electromagnetic field by:

Table 1: Numerical values of spin-flip and non-flip DCSs as a function of ¢9 for different frequencies and for summation over the ¢ number from —1 to 1. The scattering angle 07 = 0°.

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Mott scattering of polarized electrons in a circularly polarized laser field

by Bouzid Manaut

2023, Physica Scripta

We present a study of Mott scattering of polarized electrons in the presence of a laser field with circular polarization using the helicity formalism and the introduction of the well known concept of non flip differential cross section as... more

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Coulomb polarization effects in low-energy p-d elastic scattering

by Colston Chandler

2023, Physics Letters B

As a model of p-d elastic scattering, s-wave scattering is studied for a two-body potential that consists of a repulsive Coulomb potential and a central potential that decreases at large radius as the inverse fourth power of that radius.... more

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A simple theoretical description of coulomb polarization effects on the coulomb modified scattering length

by Colston Chandler

2023, Physics Letters B

A simple formula is derived for the Coulomb modified s-wave scattering length function in the presence of long-range polarization potentials. When applied to a model of low-energy p-d scattering, the formula reproduces behavior previously... more

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Effects of the electron's anomaly in relativistic laser-assisted Mott scattering

by Jean Marcel Ngoko Djiokap

2023, Physica Scripta

We investigate the influence of the electron's anomalous magnetic moment on the process of relativistic Mott scattering in a powerful electromagnetic plane wave for which the ponderomotive energy is of the order of the magnitude of the... more

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Improvement Studies of an Effective Interaction for N=Z sd-shell Nuclei by Neural Networks

by Nadjet Laouet

2023, arXiv: Nuclear Theory

The nuclear shell model is one of the successful models in theoretical understanding of nuclear structure. If a convenient effective interaction can be found between nucleons, various observables such as energies of nuclear states are... more

Figure 3. Experimental and theoretical B(E2) values

Figure 4. Experimental and calculated first excited state energies for even-even (left) and odd-odd (right) isotopes

Table 1. USDB and newly generated SDNN effective interaction matrix elements v(i,j,k,1,J,T) in MeV for T = 0. The orbits are labeled by 1=d5/2, 2=s,/2 and 3=d3/2.

Table 2. USDB and newly generated SDNN effective interaction matrix elements v(i,j,k,1,J,T) in MeV for T = 1. The orbits are labeled by 1=d5/2, 2=s,/2 and 3=d3/2. the other isotopes the results are very close to experiment.

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Scattering mechanisms in graphene suspended in liquids. II. Flexural phonons (Theory)

by Yevgeniy Puzyrev

2023

(previous talk) show that the carrier mobility observed for devices immersed in non-polar liquids, namely toluene and hexane, are significantly larger than the mobility limitation due to scattering by flexural phonons. We performed... more

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Search for broken symmetry in the Au(110) surface

by Mehmet Erbudak

2023, Solid State Communications

Spin polarized LEED results are presented which confirm predicted symmetry induced properties. Contrary to recent claims, the results do not provide any evidence for a broken bulk derived symmetry in the Au(110) surface.

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Study of Differential Cross-Section and S-Matrix Using Volkov Function and Taylor Series Expansion for Elastic Scattering

by Bhishma Karki

2023, Open Journal of Microphysics

This paper deals with S-matrix, born first approximation, amplitude, and differential cross-section (DCS), using Volkov function and Taylor series expansion in laser field, scattering. Equation (30) copes-with DCS and Equation (36) deals... more

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First Result from Scrit Electron Scattering Facility : Charge Density Distribution Of 132 Xe

by masanori wakasugi

2023, Proceedings of The 26th International Nuclear Physics Conference — PoS(INPC2016)

We have constructed the SCRIT electron scattering facility at RIKEN in order to realize electron scattering off unstable nuclei. Because electron scattering is the most powerful and reliable tool to study the internal structure of the... more

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Elastic scattering of 9Li on 208Pb at energies around the Coulomb barrier

by O. Tengblad

2023, AIP Conference Proceedings

We have studied the dynamical effects of the halo structure of 11 Li on the scattering on heavy targets at energies around the Coulomb barrier. This experiment was performed at ISAC-II at TRIUMF with a world record in production of the... more

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Studying the role of transfer and inelastic scattering on elastic scattering of alpha particles by 9Be

by ahmed dali amar

2023, Arab Journal of Nuclear Sciences and Applications

Elastic and inelastic scattering of α-particles by 9 Be nuclei have been analyzed with different incident energies. The optical model parameters (OMPs) of the elastic scattering of α-particles by 9 Be were obtained on different energies.... more

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Carrier-carrier scattering in a degenerate electron system: Strong inhibition of scattering near the Fermi edge

by DaiSik Kim

2023, Physical Review Letters

We report the first direct measurement of carrier-carrier scattering rates in a degenerate electron system. Our results on modulation-doped quantum wells, using femtosecond four-wave-mixing (FWM) techniques, demonstrate a strong... more

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New insights into Mott-scattering electron polarimetry

by Gary Fletcher

2023, Physical Review A

In order to understand some of the systematic effects associated with conventional Mottscattering electron polarization measurements, we analyzed asymmetry data obtained with 94-keV polarized electrons scattered at 120° from gold-foil... more

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Electron elastic scattering off a spin-polarized Cr atom

by V. K. Dolmatov

2023, Physical Review A

Electron elastic scattering off a spin-polarized Cr(...3d 5 4s 1 , 7 S) atom is theoretically studied in the region of electron energies up to 15 eV using both a one-electron "spin-polarized" Hartree-Fock and multielectron... more

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A low-voltage retarding-field Mott polarimeter for photocathode characterization

by Tyler Anderson

2023, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Nuclear physics experiments at Thomas Jefferson National Accelerator Facility's CEBAF rely on high polarization electron beams. We describe a recently commissioned system for prequalifying and studying photocathodes for CEBAF with a... more

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Quantitative Test of the Evolution of Geant4 Electron Backscattering Simulation

by Paolo Saracco

2022, IEEE Transactions on Nuclear Science

Evolutions of Geant4 code have affected the simulation of electron backscattering with respect to previously published results. Their effects are quantified by analyzing the compatibility of the simulated electron backscattering fraction... more

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Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from 12C and 27Al

by Darko Androić

2022, Physical Review C, 104

We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries, obtained with an electron beam polarized transverse to its momentum direction. These measurements add an additional kinematic point to... more

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Semiclassical Simulation of Electron Scattering in Warm Dense Plasma Conditions

by Victor Batista

2022

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Condensed matter electron momentum spectrometer with parallel detection in energy and momentum

by E. Weigold

2022, Review of Scientific Instruments

An electron momentum spectrometer has been constructed which measures electron binding energies and momenta by fully determining the kinematics of the incident, scattered, and ejected electrons resulting from (e,2e) ionizing collisions in... more

FIG. 1. The configuration of high voltage power supplies defining the beam energies in the present asymmetric kinematics.

FIG. 2. Momentum range of the spectrometer for azimuthal acceptance angles in the range (a) $¢,=+10°, (¢,—a)==6°, and (b) ¢,=+18°, (¢.-7)=+7°. The hatched regions show the momenta that are detected for all possible combinations of the angles ¢, and ¢,, the momentum q, along the incident beam direction being set at zero.

FIG. 3. Sectional view of the electron analyzers through the horizontal laboratory plane, i.c.. 6,=(¢-— 7)=0°. The momentum direction q, is directes perpendicular to the incident beam in the plane of the schematic and the direction of g, is perpendicular to both the beam and the plane of the schematic.

FIG. 4. Sectional view of the scattered electron cone intercepting the en- trance plane of a hemispherical deflector, with the mean radius through the hemispheres shown. At ¢,=180° the scattered electron cone no longer intercepts at the mean radius of the analyzer, and the trajectories are no longer perpendicular to the entrance plane.

FIG. 5. Plot showing the ellipse (solid curve) generated by the intersection of the hemispherical deflector entrance plane with the scattered electron cone at 0,=14°. The hemispherical deflector mean radius of 48.5 mm is also shown (dashed curve).

FIG. 9. PSD output obtained by elastic scattering through angular calibra- tion apertures at (a) $,=0,%2.57°,+5.14°, and +7.7°, for the toroidal analyzer at E;=1.2 keV and (b) ¢,=0, +3°, +7°, £11°, and +15°, for the hemispherical analyzer at £;=18.8 keV.

FIG. 11. Fast timing pulse decoupling schemes with coincidence circuitry. Fast logic pulses from the CFDs are used as start and stop input for the time to amplitude converter (TAC; Ortec 567). In coincidence mode the start pulse is taken from the hemispherical analyzer and the stop pulse from the toroidal analyzer after a nominal 20 ns delay. The resulting timing spectrum shows a peak due to true coincidences, superim- posed on a flat background. The TAC is also gated by pulses detected by a noise antenna circuit (Fig. 11) so that TAC output is inhibited when spurious pulses are detected. Position and TAC output pulses are fed to a multiparam- eter acquisition system (MAS) which forms the interface be- tween the NIM electronics and the computer. The MAS was constructed in-house and comprised ten channels of parallel data acquisition. The timing signal from the TAC and the eight amplified charge pulses from the corners of the two PSDs are fed into nine gated 12 bit analog to digitial con- verters with a conversion time of 15 ys. Pulse pile-up rejec- tion was set at 20 ys. A dual channel buffer memory system allows data conversion and subsequent storage in one 8k Electron momentum spectromete:

FIG. 10. Slow pulse circuit, showing the input to the multiparameter acquisition system (MAS) and computer. The MAS gating and timing circuit is shown in Fig. 11

FIG. 12. Timing spectra for electron flight time corrected and raw uncor- rected data. These spectra were acquired while diagnosing a noise problem, seen as the spikes to the left of the main peak in the uncorrected data. The timing correction washes out the noise peaks since they are associated with spurious electron trajectories.

FIG. 13. The 1s~! carbon core state measured for a 4.5 nm thick evaporated carbon target, to determine the coincidence energy resolution and the abso- lute binding energy scale.

FIG. 14. The momentum profiles of the argon 3p7' state at 15.7 eV and the main 3s~! state at 29.3 eV, from a gas phase measurement with incident electron energy of 20 keV, compared to a PWIA calculation. The PWIA calculation includes the effect of the finite experimental acceptance angles on the momentum resolution using a standard folding technique. Both sets of data are normalized to theory, using a single normalization factor and the well known spectroscopic factor of 0.55 for the 357! state (Ref. 4).

FIG. 15. Raw coincidence data for a 5.5 nm thick evaporated carbon target. The data shows two main valence band structures at binding energies of 8 and 20 eV at q~=0ay'. The strength in the data at binding energies above 25 eV is attributed to multiple scattéring effects, primarily plasmon excita- tion. inner valence band correlates well with an angular average of the inner valence o band of graphite at low momenta. The momentum density for this band, which shows considerable dispersion, peaks at g=0. The outer valence band is at the same energy as the high momentum density regions of the a band of graphite. The momentum density for this band peaks at about lag | These as well as other results are discussed in detail in Ref. 28.

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Elastic scattering of electrons from polarized protons and inelastic electron scattering experiments

by Eduardo Rafael

2022, Nuclear Physics B

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Inelastic magnetic electron scattering form factors of the 26Mg nucleus

by Raad Radhi

2022, Pramana

Magnetic electron scattering (M3) form factors with core polarization effects, energy levels and B(M3) values to 3 + states of the 26 Mg nucleus have been studied using shell model calculations. The universal sd of the Wildenthal... more

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Alpha-4 He Elastic Scattering with halo Effective Field Theory at Low Energy

by mohsen moosavi khansari

2022

In the present work, we studied the α- 4He particle elastic scattering by measuring cross section with halo Effective Field Theory (hEFT) at low energies. In this article, we considered α- 4He elastic scattering in S-wave state at the... more

Figure 1: One loop correction to the scattering amplitude of the nuclear interaction. The solid black lines depict the alpha particles and the dark circles depict the nuclear interactions regardless of the Coulomb interaction in the center of mass frame.

Figure 2: The integral equation of the Feynman diagrams of this interaction that demon- strate Coulomb propagator as an infinite sum. The solid black lines depict the alpha particles and the dashed lines demonstrate the photon exchange between the two alpha particles and the shaded bubble demonstrate the Coulomb interaction between the two alpha particles.

Figure 3: s-wave phase shifts at NLO and NNLO and comparison with experimental data (28, 29, 30, 31].

Figure 4: The demonstration of oc for this reaction with respect to the energy in the center of mass frame(é = 0). T-matrixes are calculated by considering the halo Effective Field Theory for this scattering at low energy. The relation for the differential cross section is [23]

Figure 5: The demonstration of ogc for this reaction with respect to the energy in the center of mass frame(¢ = 0).

Figure 6: The demonstration of o; for this reaction with respect to the energy in the center of mass frame(é = 0).

Table 1: Comparison between results by considering the coulomb and short range interaction and the total cross section.

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Ballistic electron transport in wrinkled superlattices

by Daniela Dragoman

2022, Physica E: Low-dimensional Systems and Nanostructures

Inspired by the problem of elastic wave scattering on wrinkled interfaces, we studied the scattering of ballistic electrons on a wrinkled potential energy region. The electron transmission coefficient depends on both wrinkle amplitude and... more

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Mott scattering

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