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An experimental study of the 16 Oðe; e 0 K þ Þ 16 Ã N reaction has been performed at Jefferson Lab. A thin film of falling water was used as a target. This permitted a simultaneous measurement of the pðe; e 0 K þ ÞÃ; AE 0
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich... more
An active magnetic field compensation system for the HKS aerogel Cherenkov detectors 1 ANGEL NUNEZ, JOERG REINHOLD, Florida International University, JEFFERSON LAB E05-115 (HES/HKS) COLLABORATION -Three segmented aerogel Cerenkov... more
An experimental study of the 16 Oðe; e 0 K þ Þ 16 Ã N reaction has been performed at Jefferson Lab. A thin film of falling water was used as a target. This permitted a simultaneous measurement of the pðe; e 0 K þ ÞÃ; AE 0
Hypernuclear spectroscopy with electron beam at JLab Hall C has been studied since 2000. The first experiment, JLab E89-009, demonstrated the possibility of the (e, e K +) reaction for hypernuclear spectroscopy by achieving an energy... more
Missing mass spectroscopy with the (e, e ′ K +) reaction was performed at Jefferson Laboratory's Hall C for the neutron rich Λ hypernucleus 9 Λ Li. The ground-state (g.s.) energy was obtained to be B g.s.
JLab E12-19-002 Experiment is planned to measure the Λ-binding energies of 3ΛH [Jπ = 1/2+ or 3/2+(T = 0)] and 4ΛH (1+) at JLab Hall C. The expected accuracy for the binding-energy measurement is |ΔBtotal Λ | ≃ 70 keV. The accurate... more
Missing mass spectroscopy with the (e, e ′ K +) reaction was performed at Jefferson Laboratory's Hall C for the neutron rich Λ hypernucleus 9 Λ Li. The ground-state (g.s.) energy was obtained to be B g.s.
JLab E05-115 which is an experiment for Λ hypernuclear spectroscopy with electron beams was carried out at Jefferson Lab (JLab) in 2009. In the experiment, 7 Λ He, 9 Λ Li, 10 Λ Be, 12 Λ B and 52 Λ V were measured by new magnetic... more
A Λ hyperon which has a strangeness can be bound in deep inside of a nucleus since a Λ does not suffer from the Pauli exclusion principle from nucleons. Thus, a Λ could be a useful tool to investigate inside of a nucleus. Since 2000, Λ... more
The lifetime of a Λ particle embedded in a nucleus (hypernucleus) decreases from that of free Λ decay due to the opening of the ΛN → N N weak decay channel. However, it is generally believed that the lifetime of a hypernucleus attains a... more
Spectroscopic study of Λ hypernuclei in the medium-heavy mass region and p-shell region using the (e,e ′ K +) reaction
The lifetime of a particle embedded in a nucleus (hypernucleus) decreases from that of free decay mainly due to the opening of the N → NN weak decay channel. However, it is generally believed that the lifetime of a hypernucleus attains a... more
A hypernulear γ-ray spectroscopy experiment (E13) will be performed using K − beam at the K1.8 beam line of the J-PARC Hadron Experimental Facility in 2015. In this experiment, we will determine the B(M 1) value of the Λ spin-flip... more
An investigation is made of the effect of the (central) A-nucleon potential V~and of the density distribution p of the a particle on the central part of the V~interaction, in the framework of the rigid-core model, adopted originally in... more
Missing-mass spectroscopy with the 3 H(e, e ′ K +) reaction was carried out at Jefferson Lab's (JLab) Hall A in Oct-Nov, 2018. The differential cross section for the 3 H(γ * , K +)Λnn was deduced at ω = E e − E e ′ = 2.102 GeV and at the... more
An experimental study of the 16 Oðe; e 0 K þ Þ 16 Ã N reaction has been performed at Jefferson Lab. A thin film of falling water was used as a target. This permitted a simultaneous measurement of the pðe; e 0 K þ ÞÃ; AE 0
Spectroscopic study of Λ hypernuclei in the medium-heavy mass region and p-shell region using the (e,e ′ K +) reaction
JLab E05-115 which is an experiment for Λ hypernuclear spectroscopy with electron beams was carried out at Jefferson Lab (JLab) in 2009. In the experiment, 7 Λ He, 9 Λ Li, 10 Λ Be, 12 Λ B and 52 Λ V were measured by new magnetic... more
JLab E12-19-002 Experiment is planned to measure the Λ-binding energies of 3ΛH [Jπ = 1/2+ or 3/2+(T = 0)] and 4ΛH (1+) at JLab Hall C. The expected accuracy for the binding-energy measurement is |ΔBtotal Λ | ≃ 70 keV. The accurate... more
In order to produce a neutron-rich hypernucleus for the first time, we carried out an experiment by utilizing the ÿ ; K double charge-exchange reaction on a 10 B target. We observed the production of a 10 Li hypernucleus. The cross... more
A spectroscopic study of A hypernuclei by the (~r +, K +) reaction has been performed for the wide hypernuclear mass range using a new superconducting kaon spectrometer (INS-SKS) at the KEK 12 GeV PS. A v2C spectrum with 2 MeV (FWHM)... more
Scanning systems for detecting double Lambda hypernucler events in nuclear emulsion plates with high statistics are presented. The systems are complexes of optical microscopes and computers to provide fast emulsion scanning and image... more
The investigation of light hypernuclei is quite important for understanding the basic YN interaction and the mechanism of hypernuclear structure. We started the commissioning of the decay pion spectroscopy of light hypernuclei at MAMI-C... more
This proposal is an extension request of the partially approved proposal of JLab E01-011. The experimental goal of the E01-011 experiment was to prove the effectiveness of (e, e'K +) hypernuclear spectroscopy by employing the "tilt... more
The goal of this study is to determine the spin-orbit splitting of 1p proton orbits in oxygen isotopes. An experiment for the exclusive measurement of the (p, 2p) reaction was carried out at the SHARAQ beamline at RI Beam Factory, RIKEN.... more
An nnΛ is a neutral baryon system with no charge. The study of the pure Λ-neutron system such as nnΛ gives us information on the Λn interaction. The nnΛ search experiment (E12-17-003) was performed at JLab Hall A in 2018. In this article,... more
JLab E05-115 which is an experiment for Λ hypernuclear spectroscopy with electron beams was carried out at Jefferson Lab (JLab) in 2009. In the experiment, 7 Λ He, 9 Λ Li, 10 Λ Be, 12 Λ B and 52 Λ V were measured by new magnetic... more
The present status and future prospects of precision γ-ray spectroscopy of Λ hypernuclei are described. A new experiment (J-PARC E13) has been performed at the J-PARC K1.8 line employing a newly-developed germanium (Ge) detector array,... more
A spectroscopy of a 10 Λ Be hypernucleus was carried out at JLab Hall C using the (e, e ′ K +) reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was used to... more
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich... more
The design, construction, and performance of a segmented-target, cathode-strip, tracking-detector is discussed. The chamber was made of low-Z materials in order to allow photons to leave the target region. It was used to determine the... more
Spectroscopy of a ^10_ΛBe hypernucleus was carried out at JLab Hall C using the (e,e^'K^+) reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was used to... more
Missing mass spectroscopy with the (e, e ′ K +) reaction was performed at Jefferson Laboratory's Hall C for the neutron rich Λ hypernucleus 9 Λ Li. The ground-state (g.s.) energy was obtained to be B g.s.
The lifetime of a particle embedded in a nucleus (hypernucleus) decreases from that of free decay mainly due to the opening of the N → NN weak decay channel. However, it is generally believed that the lifetime of a hypernucleus attains a... more
A Λ hyperon which has a strangeness can be bound in deep inside of a nucleus since a Λ does not suffer from the Pauli exclusion principle from nucleons. Thus, a Λ could be a useful tool to investigate inside of a nucleus. Since 2000, Λ... more
Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using the (e, e K +) reaction was completed, two additional experiments, E01-011 and E05-115, were performed at Jefferson Lab. These later experiments used a... more
In this paper, a preliminary result from the latest hypernuclear γ-ray spectroscopy experiment (KEK-E566) is presented together with a short discussion. The experiment was performed at the KEK-PS K6 beam line in 2005. In this experiment,... more
Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward... more
We discuss the enhancement of Λ-Σ coupling effect in neutron-excess Λ-hypernuclei. A hyperheavy 6 Λ H would be a promising candidate for observing this coupling effect.
The goal of this study is to determine the spin-orbit splitting of 1p proton orbits in oxygen isotopes. An experiment for the exclusive measurement of the (p, 2p) reaction was carried out at the SHARAQ beamline at RI Beam Factory, RIKEN.... more
JLab E12-19-002 Experiment is planned to measure the Λ-binding energies of 3ΛH [Jπ = 1/2+ or 3/2+(T = 0)] and 4ΛH (1+) at JLab Hall C. The expected accuracy for the binding-energy measurement is |ΔBtotal Λ | ≃ 70 keV. The accurate... more
The missing mass spectroscopy of the 7 Λ He hypernucleus was performed, using the 7 Li(e, e ′ K +) 7 Λ He reaction at JLab Hall-C. The Λ binding energy of the ground state (1/2 +) was determined with a smaller error than that of the... more
A spectroscopy of a 10 Λ Be hypernucleus was carried out at JLab Hall C using the (e, e ′ K +) reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was used to... more
Hypernuclear spectroscopy with electron beam at JLab Hall C has been studied since 2000. The first experiment, JLab E89-009, demonstrated the possibility of the (e, e K +) reaction for hypernuclear spectroscopy by achieving an energy... more
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich... more
High energy CW electron beams at new accelerator facilities allow electromagnetic production and precision study of hypernuclear structure, and we report here on the first experiment demonstrating the usefulness of the (e,e ′ K +)... more
Since the 1st generation experiment, E89-009, which was successfully carried out as a pilot experiment of (e,e'K+) hypernuclear spectroscopy at JLab Hall C in 2000, precision hypernuclear spectroscopy by the (e,e'K+) reactions made... more