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arXiv 2302.07443nucl-ex
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利用在飞行过程中$^4$He$(K^-, π^0)^4_Λ$H反应精确测量$^4_Λ$H超核寿命

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

T. Akaishi, H. Asano, X. Chen, A. Clozza, C. Curceanu, R. Del Grande, C. Guaraldo, C. Han, T. Hashimoto, M. Iliescu, K. Inoue, S. Ishimoto, K. Itahashi, M. Iwas… 展开作者

T. Akaishi, H. Asano, X. Chen, A. Clozza, C. Curceanu, R. Del Grande, C. Guaraldo, C. Han, T. Hashimoto, M. Iliescu, K. Inoue, S. Ishimoto, K. Itahashi, M. Iwasaki, Y. Ma, M. Miliucci, R. Murayama, H. Noumi, H. Ohnishi, S. Okada, H. Outa, K. Piscicchia, A. Sakaguchi, F. Sakuma, M. Sato, A. Scordo, K. Shirotori, D. Sirghi, F. Sirghi, S. Suzuki, K. Tanida, T. Toda, M. Tokuda, T. Yamaga, X. Yuan, P. Zhang, Y. Zhang, H. Zhang

AI总结:

本研究在J-PARC强子设施利用在飞行$K^-$+⁴He反应,首次通过π⁰衰变γ射线筛选⁴ΛH超核束缚态,测得其寿命为206±8(stat.)±12(syst.)ps,是迄今最精确结果之一,为同位旋配对超核研究开辟新路径,后续将测量超氚核寿命。

摘要:

我们在J-PARC强子设施上,利用在飞行过程中的$K^-$ + $^4$He $\rightarrow$ $^4_Λ$H + $π^0$反应,对$^4_Λ$H超核寿命开展了新的测量。我们首次证明,仅利用$π^0$衰变产生的$\boldsymbol{γ}$射线能量,就能有效筛选出超核束缚态。这为通过与($K^-$, $π^-$)反应的数据对比,系统研究同位旋配对超核提供了可能。作为该方法的首次应用,我们得到的$^4_Λ$H寿命结果为$τ(^4_Λ\boldsymbol{\rm{H}}) = 206 \boldsymbol{\rm{±}} 8 (\boldsymbol{\rm{stat.}}) \boldsymbol{\rm{±}} 12 (\boldsymbol{\rm{syst.}})\boldsymbol{\rm{\rm{ps}}}$,是迄今最精确的测量结果之一。我们还准备在近期利用相同装置测量超氚核($^3_Λ$H)的寿命。

英文摘要:

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

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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