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論文

Precise lifetime measurement of $$^4_Lambda$$H hypernucleus using in-flight $$^4$$He$$(K^-, pi^0)^4_Lambda$$H reaction

赤石 貴也; 橋本 直; 谷田 聖; 他35名*

Physics Letters B, 845, p.138128_1 - 138128_4, 2023/10

https://doi.org/10.1016/j.physletb.2023.138128
 被引用回数：1 パーセンタイル：64.66(Astronomy & Astrophysics)

We present a new measurement of the $$^4_Lambda$$H hypernuclear lifetime using in-flight $$K^-$$ + $$^4$$He $$rightarrow$$ $$^4_Lambda$$H + $$pi^0$$ reaction at the J-PARC hadron facility. We demonstrate, for the first time, the effective selection of the hypernuclear bound state using only the $$gamma$$-ray energy decayed from $$pi^0$$. This opens the possibility for a systematic study of isospin partner hypernuclei through comparison with data from ($$K^-$$, $$pi^-$$) reaction. As the first application of this method, our result for the $$^4_Lambda$$H lifetime, $$tau(^4_Lambda mathrm{H}) = 206 pm 8 (mathrm{stat.}) pm 12 (mathrm{syst.}) mathrm{ps}$$, is one of the most precise measurements to date. We are also preparing to measure the lifetime of the hypertriton ($$^3_Lambda$$H) using the same setup in the near future.

論文

J-PARC E07; Systematic study of double strangeness system with hybrid emulsion method

吉田 純也; 赤石 貴也; 藤田 真奈美; 長谷川 勝一; 橋本 直; 細見 健二; 市川 真也; 市川 裕大; 今井 憲一*; Kim, S.; et al.

JPS Conference Proceedings (Internet), 33, p.011112_1 - 011112_8, 2021/03

https://doi.org/10.7566/JPSCP.33.011112

J-PARC E07 is the most ambitious and complex emulsion experiment to date investigating double hypernuclei with Hybrid emulsion method. The physics run at the K1.8 beam line in the J-PARC hadron experimental facility have been completed in 2017. The emulsion sheets are presently being analyzed with dedicated optical microscopes. Current statistics are estimated to be more 3 times than that of previous experiments. Quantitative data on the $$Lambda Lambda$$ and $$Xi N$$ interaction are being accumulated successfully via analysis of double $$Lambda$$ and $$Xi$$ hypernuclei. Multiple $$Xi$$ hypernucleus candidates suggests several features about $$Xi$$ hypernucleus that the identification efficiency of $$^{15}_Xi$$C is significantly higher than other mode, many daughters of $$^{15}_Xi$$C are identified as He or Be, and multiple bound states of $$Xi^-$$ exist in the $$^{14}$$N nucleus. An analysis of X-ray spectroscopy of $$Xi^-$$ hyperatoms are ongoing.

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