Bibliographic Details
| Title: |
Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment. |
| Authors: |
Ekawa, H, Agari, K, Ahn, J K, Akaishi, T, Akazawa, Y, Ashikaga, S, Bassalleck, B, Bleser, S, Endo, Y, Fujikawa, Y, Fujioka, N, Fujita, M, Goto, R, Han, Y, Hasegawa, S, Hashimoto, T, Hayakawa, S H, Hayakawa, T, Hayata, E, Hicks, K |
| Source: |
Progress of Theoretical & Experimental Physics: PTEP; Feb2019, Vol. 2019 Issue 2, pN.PAG-N.PAG, 1p |
| Subject Terms: |
HYPERFRAGMENTS, NUCLEAR emulsions, HYPERONS, MAGNETIC spectrometer, PARTICLE density (Nuclear chemistry) |
| Abstract: |
A double- |$\Lambda$| hypernucleus, |${}_{\Lambda\Lambda}\mathrm{Be}$|, was observed by the J-PARC E07 Collaboration in nuclear emulsions tagged by the (|$K^{-}, K^{+}$|) reaction. This event was interpreted as the production and decay of |$ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$|, |${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$|, or |${}_{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$| via |$\Xi^{-}$| capture in |${}^{16}\mathrm{O}$|. By assuming capture in the atomic 3D state, the binding energies of two |$\Lambda$| hyperons (|$B_{\Lambda\Lambda}$|) of these double- |$\Lambda$| hypernuclei are obtained to be |$15.05 \pm 0.11\,\mathrm{MeV}$|, |$19.07 \pm 0.11\,\mathrm{MeV}$|, and |$13.68 \pm 0.11\,\mathrm{MeV}$|, respectively. Based on the kinematic fitting, |${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$| is the most likely explanation for the observed event. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
