Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

Ekawa, Hiroyuki; Ashikaga, Sakiko; Hasegawa, Shoichi ; Hashimoto, Tadashi ; Hayakawa, Shuhei; Hosomi, Kenji ; Ichikawa, Yudai ; Imai, Kenichi; Kimbara, Shinji*; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki ; Sato, Susumu ; Suzuki, Kazuki; Tamura, Hirokazu; Tanida, Kiyoshi ; Yamamoto, Takeshi ; Yoshida, Junya; 85 of others*

A double- hypernucleus, ${}_{LambdaLambda}mathrm{Be}$ , was observed by the J-PARC E07 collaborationin nuclear emulsions tagged by the $(K^{-},K^{+})$ reaction. This event was interpreted as a production and decay of ${}_{LambdaLambda}^{;10}mathrm{Be}$ , ${}_{LambdaLambda}^{;11}mathrm{Be}$ , or ${}_{LambdaLambda}^{;12}mathrm{Be}^{*}$ via $Xi^{-}$ capture in ${}^{16}mathrm{O}$ .By assuming the capture in the atomic 3D state, the binding energy of two hyperons( $B_{LambdaLambda}$ )of these double- hypernuclei are obtained to be, , and , respectively. Based on the kinematic fitting, ${}_{LambdaLambda}^{;11}mathrm{Be}$ is the most likely explanation for the observed event.

Language	:	English
Journal	:	Progress of Theoretical and Experimental Physics (Internet)
Volume	:	2019
Number	:	2
Pages	:	p.021D02_1 - 021D02_11
Publication Year/Month	:	2019/02
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Paper URL	:	https://doi.org/10.1093/ptep/pty149
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	ハイパー核
Research Facility	:	J-PARC原子核素粒子実験施設
Press Release	:	新種の超原子核(二重ラムダ核)を発見; 中性子星の内部構造の謎に迫る
Article of JAEA R&D Review	:	Observation of a New Double Lambda Hypernucleus during a J-PARC Experiment; As a Microscopic Image, the Second Case Where the Nuclide is Identified[/]
Cooperating Institute	:	J-PARC; 岐阜大学; 高エネルギー加速器研究機構

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Registration No. : AA20180594
JAEA Abstracts No. : 47000862
Paper Submission No. : 21501

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