학술논문
Precise lifetime measurement of Λ4H hypernucleus using in-flight 4He(K−,π0)Λ4H reaction
Document Type
article
Author
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
Source
Physics Letters B, Vol 845, Iss , Pp 138128- (2023)
Subject
Language
English
ISSN
0370-2693
Abstract
We present a new measurement of the Λ4H hypernuclear lifetime using in-flight K− + 4He → Λ4H + π0 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 π0. 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 Λ4H lifetime, τ(HΛ4)=206±8(stat.)±12(syst.)ps, is one of the most precise measurements to date. We are also preparing to measure the lifetime of the hypertriton (Λ3H) using the same setup in the near future.