TY - JOUR
T1 - Experimental techniques and performance of Λ-hypernuclear spectroscopy with the (e,e′K+) reaction
AU - Gogami, T.
AU - Chen, C.
AU - Fujii, Y.
AU - Hashimoto, O.
AU - Kaneta, M.
AU - Kawama, D.
AU - Maruta, T.
AU - Matsumura, A.
AU - Nagao, S.
AU - Nakamura, S. N.
AU - Okayasu, Y.
AU - Reinhold, J.
AU - Tang, L.
AU - Tsukada, K.
AU - Wood, S. A.
AU - Yuan, L.
N1 - Funding Information:
At first, we thank the JLab staffs of the physics, accelerator, and engineering divisions for support of the experiment. We also express our appreciation to all of members of HNSS (E89-009) and HKS (E01-011 and E05-115) Collaborations. We thank M. Sumihama and T. Miyoshi for their contributions to the early stage of the hypernuclear experiments at JLab Hall C. We thank teams led by P. Brindza and W. Kellner respectively for their large contributions to designs of detector frames and vacuum systems, and installation of the experimental equipment in JLab Hall C. We appreciate efforts on design and fabrication of the target system by I. Sugai, D. Meekins, and A. Shichijo. We thank N. Chiga for his technical supports at Tohoku University. We thank Research Center for Electron Photon Science, Tohoku University (ELPH), Cyclotron and Radioisotope Center, Tohoku University (CYRIC), and KEK-PS for giving us opportunities of performance tests for the detector and target systems. The HKS experimental program at JLab was supported by JSPS KAKENHI Grants No. 18H01219 , No. 17H01121 , No. 12002001 , No. 15684005 , No. 16GS0201 , Grant-in-Aid for JSPS fellow No. 12J04123 , JSPS Core-to-Core Program No. 21002 , and JSPS Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation No. R2201 . This program was partially supported by JSPS and DAAD under the Japan–Germany Research Cooperative Program, and the Graduate Program on Physics for the Universe, Tohoku University (GP-PU). This work was supported by U.S. Department of Energy Contracts No. DE-AC05-84ER40150 , No. DE-AC05-06OR23177 , No. DE-FG02-99ER41065 , No. DE-FG02-97ER41047 , No. DE-AC02-06CH11357 , No. DE-FG02-00ER41110 , and No. DE-AC02-98CH10886 , and U.S.-NSF Contracts No. 013815 and No. 0758095 .
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/8/21
Y1 - 2018/8/21
N2 - The missing-mass spectroscopy of Λ hypernuclei via the (e,e′K+) reaction has been developed through experiments at JLab Halls A and C in the last two decades. For the latest experiment, E05-115 in Hall C, we developed a new spectrometer system consisting of the HKS and HES; resulting in the best energy resolution (ΔE≃0.5-MeV FWHM) and BΛ accuracy (ΔBΛ≤0.2MeV) in Λ-hypernuclear reaction spectroscopy. This paper describes the characteristics of the (e,e′K+) reaction compared to other reactions and experimental methods. In addition, the experimental apparatus, some of the important analyses such as the semi-automated calibration of absolute energy scale, and the performance achieved in E05-115 are presented.
AB - The missing-mass spectroscopy of Λ hypernuclei via the (e,e′K+) reaction has been developed through experiments at JLab Halls A and C in the last two decades. For the latest experiment, E05-115 in Hall C, we developed a new spectrometer system consisting of the HKS and HES; resulting in the best energy resolution (ΔE≃0.5-MeV FWHM) and BΛ accuracy (ΔBΛ≤0.2MeV) in Λ-hypernuclear reaction spectroscopy. This paper describes the characteristics of the (e,e′K+) reaction compared to other reactions and experimental methods. In addition, the experimental apparatus, some of the important analyses such as the semi-automated calibration of absolute energy scale, and the performance achieved in E05-115 are presented.
KW - (e,eK) reaction
KW - High accuracy energy calibration
KW - Kaon detection
KW - Magnetic spectrometer systems
KW - Missing-mass spectroscopy
KW - Λ hypernuclei
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U2 - 10.1016/j.nima.2018.05.042
DO - 10.1016/j.nima.2018.05.042
M3 - Article
AN - SCOPUS:85048300130
VL - 900
SP - 69
EP - 83
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
ER -