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論文

X ray spectroscopy on $$Xi$$$$^-$$ atoms (J-PARC E03, E07 and future)

山本 剛史; 藤田 真奈美; 後神 利志*; 原田 健志*; 早川 修平*; 細見 健二; 市川 裕大; 石川 勇二*; 鎌田 健人*; 叶内 萌香*; et al.

EPJ Web of Conferences, 271, p.03001_1 - 03001_5, 2022/11

https://doi.org/10.1051/epjconf/202227103001

X-ray spectroscopy of hadronic atoms give us various information on the strong interaction between hadrons and nuclei. At J-PARC, we are aiming for the world-first detection of the X rays from atoms with a doubly strange hyperon, $$Xi$$$$^-$$. Recently, two experiments, J-PARC E07 and J-PARC E03, have been performed for the detection of X rays from $$Xi$$$$^-$$ atoms. Overview and status of these measurements will be presented. We will also discuss future plan of X-ray spectroscopy on $$Xi$$$$^-$$-atoms, which can be performed together with high resolution $$Xi$$$$^-$$ hyper nuclear spectroscopy using newly constructed S-2S spectrometer. Preparation status will be shown in this contribution.

論文

Development of a Ge detector array and an in-beam calibration system for highly precise measurement of $$Xi^-$$ atomic X-rays

藤田 真奈美; 細見 健二; 石川 勇二*; 叶内 萌香*; 小池 武志*; 小椋 裕*; 田村 裕和; 谷田 聖; 鵜養 美冬*; 山本 剛史

Nuclear Instruments and Methods in Physics Research A, 1042, p.167439_1 - 167439_9, 2022/11

https://doi.org/10.1016/j.nima.2022.167439
 被引用回数：2 パーセンタイル：37.57(Instruments & Instrumentation)

$$Xi^-$$ atomic X-ray spectroscopy is a powerful method of studying the $$Xi$$N interaction, for which very limited experimental data are currently available. For this reason, we constructed a germanium (Ge) detector array referred to as Hyperball-X and conducted the first-ever $$Xi^-$$ atomic X-ray measurements in 2016 and 2017 at J-PARC. We developed a novel method for in-beam energy calibration of Ge detectors. Three $$gamma$$ rays (202 keV, 307 keV, and 511 keV) from $$^{176}$$Lu in LSO scintillation counters and $$^{22}$$Na source were used as reference. The $$beta-gamma$$ and $$gamma-gamma$$ coincidence detection using the Ge detectors and LSO counters allows for continuous in-beam calibration with this new calibration method, and the calibration uncertainty is reduced to less than $$pm$$100 eV for energies ranging from 202 to 511 keV.

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