Observation of a He-6(Lambda Lambda) double hypernucleus
Year: 2001
Type: article
Abstract: A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ${}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}^{6}\mathrm{He}$ emitted from a ${\ensuremath{\Xi}}^{\ensuremath{-}}$ hyperon nuclear capture at rest. The mass of ${}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}^{6}\mathrm{He}$ and the $\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\Lambda}$ interaction energy $\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$ have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of $\ensuremath{\Delta}{B}_{\ensuremath{\Lambda}\ensuremath{\Lambda}}$ is $1.01\ifmmode\pm\else\textpm\fi{}{0.20}_{\ensuremath{-}0.11}^{+0.18}\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$. This demonstrates that the $\ensuremath{\Lambda}\ensuremath{-}\ensuremath{\Lambda}$ interaction is weakly attractive.
Authors: H. Takahashi, JK Ahn, H. Akikawa, S. Aoki, K. Arai, SY Bahk, K. M. Baik, B. Bassalleck, Chung Jh, Chung, D.H. Davis, Tomokazu Fukuda, K. Hoshino, A. K. Ichikawa, M. Ieiri, K. Imai, YH Iwata, YS Iwata, Hiroyuki Kanda, M. Kaneko, Takeshi Kawai, M. Kawasaki, CO Kim, Jae-Young Kim, Sung‐Jae Kim, Sang‐Ha Kim, Y. Kondō, T. Kouketsu, YL Lee, J. W. C. McNabb, Manabu Mitsuhara, Y. Nagase, C. Nagoshi, K. Nakazawa, H. Noumi, S. Ogawa, H. Okabe, K. Oyama, HM Park, IG Park, Joseph D. Parker, YS Ra, J. H. Rhee, A. Rusek, H. Shibuya, KS Sim, PK Saha, Daikichi Seki, M. Sekimoto, Jun S. Song, Toshiya Takahashi, F. Takéutchi, H. Tanaka, K. Tanida, J. Tojo, H. Torii, S. Torikai, D.N. Tovee, N. Ushida, Kazuhiro Yamamoto, N. Yasuda, Yang Jt, CJ Yoon, C.S. Yoon, M. Yosoi, T. Yoshida, Li Zhu
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W120232273