Identification of the(9/2+to(5/2−transition inSe69

Nuclear Physics A, 1981

ABSTRACT An unbound level in 49Ti at 8884 keV was photoexcited using a γ-beam obtained from the Cr(n, γ) reaction. The γ-decay and n-decay properties of this level were studied using angular distributions and polarization measurements. Thus spin and parity assignments of some levels in 49Ti were made. The neutron width and the total radiative widths of the 8884 keV level were determined to be: Γn = 0.25 ± 0.05 eV, Γγ = 2.55 ± 0.80 eV.

Nuclear Physics A, 1993

An extensive investigation of '"Sm has been carried out with the (n, n'-y) reaction. Gamma-ray excitation function and angular-distribution measurements were performed at neutron energies up to 4.3 MeV. Many new levels have been established and characterized, and the assignments of several previously known states have been clarified. Level lifetimes were measured following the inelastic neutron-scattering reaction by observing the Doppler shifts of de-exciting-y-rays, and reduced transition rates have been inferred. Recent shell-model calculations were found to describe the '"Sm level scheme very well up to 3.2 MeV. A large number of relatively fast El transitions were observed.

Physical Review C, 2009

The combined data from three fusion-evaporation reaction experiments have been utilized to investigate the semi-magic nucleus 58 28 Ni 30. To detect γ rays in coincidence with evaporated particles, the Ge-detector array Gammasphere was used in conjunction with the charged-particle detectors Microball and LuWuSiA (the Lund Washington University Silicon Array), and a neutron detector array. The results yield a significantly extended level scheme of 58 Ni comprising some 340 γ-ray transitions and include a total of at least 14 discrete particle decays into excited states of the daughter nuclei 54 Fe and 57 Co. The level scheme is compared with large-scale shell-model calculations and cranked Nilsson-Strutinsky calculations.

Gamma-ray coincidence techniques are used to determine new level structures in the N = 81 nucleus 139 Ce, at low spins and excitation energies with the 139 La(p, nγ) reaction at 5.0 and 6.0 MeV incident energy, and at high spins with the 130 Te( 12 C, 3nγ) reaction at 50.5 MeV, respectively. Lifetime determinations are also made in the (p, nγ) reaction with the centroid DSA method. The observed level structures are discussed by comparison with existing calculations and with those in the neighbouring nucleus 140 Ce. PACS. 21.10.-k Properties of nuclei; nuclear energy levels -23.20.Lv gamma transitions and level energies -27.60.+j 90 ≤ A ≤ 149

Physical Review C, 2019

A dedicated spectroscopic study of the β decay of 127 Cd was conducted at the IGISOL facility at the University of Jyväskylä. Following high-resolution mass separation in a Penning trap, β-γ-γ coincidences were used to considerably extend the decay scheme of 127 In. The β-decaying 3/2 + and 11/2 − states in 127 Cd have been identified with the 127 Cd ground state and the 283-keV isomer. Their respective half-lives have been measured to 0.45(12 8) s and 0.36(4) s. The experimentally observed β feeding to excited states of 127 In and the decay scheme of 127 In are discussed in conjunction with large-scale shell-model calculations.

2020

2005

From the analysis of γ-γ-γ coincidence data taken with Gammasphere of the prompt γ rays in the spontaneous fission of 252 Cf, the 2 + → 0 + transition in 88 Se was identified for the first time. Also, the 4 + → 2 + and 6 + → 4 + transitions in 86 Se were identified along with four new states above 4 + in 84 Se. Surprisingly, the 2 + energy rises in 88 Se compared to 86 Se. This increase in energy could arise from the interaction of a low-lying excited 0 + state with different deformation and the 0 + ground state to depress the ground-state energy.

Physical Review C, 2013

The decay of 84 Ga has been reinvestigated at the PARRNe online mass separator of the electron-driven installation ALTO at IPN Orsay. The nominal primary electron beam of 10 μA (50 MeV) on a 238 UC x target in combination with resonant laser ionization were used for the first time at ALTO. Improved level schemes of the neutron-rich 83,84 Ge (Z = 32) isotopes were obtained. The experimental results are compared with the state-of-the-art shell model calculations and discussed in terms of collectivity development in the natural valence space outside the 78 Ni core.

2013

A comprehensive list of the best measured wavelengths in the In II spectrum has been compiled. Uncertainties of the wavelength measurements have been analyzed, and existing inconsistencies have been resolved. An optimized set of fine-structure energy levels that fits all observed wavelengths has been derived. Uncertainties of the energy level values have been reduced by an order of magnitude. An improved value of the ionization limit of In II has been determined by fitting quantum-defect and polarization formulas for several series of levels. Intensities of lines observed by different authors have been analyzed and converted to a uniform scale. A set of recommended values of radiative transition rates has been critically compiled, and uncertainties of these rates have been estimated. The hyperfine structure interval in the 5s 2 S ground state of In III has been determined from the measurements of the 5sng and 5snh series in In II. 53 http://dx.doi.org/10.6028/jres.118.004 hyperfine interaction. With the clock application in mind, Larkins and Hannaford [8] have measured the absolute frequencies of hyperfine components of several transitions in 115 In + , from which they derived the corresponding energy levels and hfs interaction constants. In particular, the wave number of the abovementioned clock transition was found to be 42275.986(7) cm −1 . This result was confirmed two years later by Peik et al. . In 2001, von Zanthier et al. [10] refined this wave number by many orders of magnitude. Their result, 42275.995245348(8) cm −1 , agrees with both previous measurements.

Physical Review C, 2005

The level structure of 249 Bk has been investigated by measuring the γ-ray spectra of an extremely pure 253 Es sample obtained by milking this nuclide from 253 Cf source material produced in the High Flux Isotope Reactor at Oak Ridge National Laboratory. Additional information on the 249 Bk levels was obtained from the β −-decay study of 249 Cm, produced by neutron irradiation of 248 Cm. Using the results of the present study together with the data from previous 248 Cm(α, t) and 248 Cm(3 He, d) reactions, the following single-particle states have been identified in 249 Bk: 7/2 + [633], 0.0 keV; 3/2 − [521], 8.78 keV; 1/2 + [400], 377.55 keV; 5/2 + [642], 389.17 keV; 1/2 − [530], 569.20 keV; 1/2 − [521], 643.0 keV; 5/2 − [523], 672.9 keV; and 9/2 + [624], 1075.1 keV. Four vibrational bands were identified at 767.9, 932.2, 1150.7, and 1223.0 keV with tentative assignments of {7/2 + [633] ⊗ 1 − }9/2 − , {7/2 + [633] ⊗ 0 − }7/2 − , {7/2 + [633] ⊗ 1 − }5/2 − , and {7/2 + [633] ⊗ 0 + }7/2 + , respectively. A band at 899.9 keV was observed in γ-γ coincidence measurements and given a tentative spin assignment of 3/2. It is possibly associated with a 2 − phonon coupled to the ground state, with configuration {7/2 + [633] ⊗ 2 − }3/2 −. Three levels at 624.3, 703.5, and 769.1 keV were assigned spins of 5/2, 7/2, and 9/2, respectively. These could be the members of the 3/2 + [651] band, expected in this energy region.