3 years ago

Experimental techniques and performance of $\Lambda$-hypernuclear spectroscopy with the $(e,e^{\prime}K^{+})$ reaction.

L. Tang, O. Hashimoto, K. Tsukada, C. Chen, D. Kawama, M. Kaneta, S. A. Wood, S. N. Nakamura, S. Nagao, T. Maruta, T. Gogami, J. Reinhold, A. Matsumura, L. Yuan, Y. Okayasu, Y. Fujii

The missing-mass spectroscopy of $\Lambda$ hypernuclei via the $(e,e^{\prime}K^{+})$ 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 ($E_{\Lambda} \simeq0.5$-MeV FWHM) and $B_{\Lambda}$ accuracy ($B_{\Lambda}\leq0.2$ MeV) in $\Lambda$-hypernuclear reaction spectroscopy. This paper describes the characteristics of the $(e,e^{\prime}K^{+})$ 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.

Publisher URL: http://arxiv.org/abs/1709.05682

DOI: arXiv:1709.05682v3

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