Observation of Double-strangeness Nuclei using Nuclear-emulsion Technology

Aung Nay Lin Nyaw; Hiroyuki EKAWA; FUJITA Manami; HAYAKAWA Shuhei; KASAGI Ayumi; Phyo Myat Lin; Kazuma NAKAZAWA; Junya YOSHIDA; Masahiro YOSHIMOTO

doi:10.11454/ephotogrst.30.2_22

Aung Nay Lin Nyaw , Hiroyuki EKAWA, FUJITA Manami, HAYAKAWA Shuhei, KASAGI Ayumi, Phyo Myat Lin, Kazuma NAKAZAWA, Junya YOSHIDA, Masahiro YOSHIMOTO

著者情報

キーワード: Double hypernuclei, Double strangeness, Binding energy, J-PARC E07, Nuclear emulsion

ジャーナルオープンアクセス

2020 年 30 巻 2 号 p. 22-25

DOI https://doi.org/10.11454/ephotogrst.30.2_22

詳細

抄録

The J-PARC E07 experiment aimed to systematically detect double-strangeness nuclei with emulsion technologies. Thirty-three events were detected within 2 years by following of Ξ - tracks. One event of D001 among them was examined to identify the production and decay pro- cesses by energy and momentum conservation obtained from the track lengths and emission angles of daughter particles. The event was de- termined to be Λ1 Λ0 Be (8Be and two Λ particles) as the most likely case assuming Ξ - capture in the atomic 3D state of 14N. The binding energy of the two Λ hyperons and the core nucleus of this double-Λ hypernucleus was 15.22 ± 2.78 MeV, and the Λ-Λ interaction strength was 1.80 ± 2.78 MeV.

責任著者(Corresponding author)

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