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Observation of a He-6(Lambda Lambda) double hypernucleus - art. no. 212502

Authors

Takahashi, H Ahn, JK Akikawa, H Aoki, S Arai, K Bahk, SY Baik, KM Bassalleck, B Chung, JH Chung, MS Davis, DH Fukuda, T Hoshino, K Ichikawa, A Ieiri, M Imai, K Iwata, YH Iwata, YS Kanda, H Kaneko, M Kawai, T Kawasaki, M Kim, CO Kim, JY Kim, SJ Kim, SH Kondo, Y Kouketsu, T Lee, YL McNabb, JWC Mitsuhara, M Nagase, Y Nagoshi, C Nakazawa, K Noumi, H Ogawa, S Okabe, H Oyama, K Park, HM Park, IG Parker, J Ra, YS Rhee, JT Rusek, A Shibuya, H Sim, KS Saha, PK Seki, D Sekimoto, M Song, JS Takahashi, T Takeutchi, F Tanaka, H Tanida, K Tojo, J Torii, H Torikai, S Tovee, DN Ushida, N Yamamoto, K Yasuda, N Yang, JT Yoon, CJ Yoon, CS Yosoi, M Yoshida, T Zhu, L

Citation

H. Takahashi et al., Observation of a He-6(Lambda Lambda) double hypernucleus - art. no. 212502, PHYS REV L, 8721(21), 2001, pp. 2502

Citations number

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW LETTERS

ISSN journal

00319007 → ACNP

Volume

8721

Issue

Year of publication

2001

Database

ISI

SICI code

0031-9007(20011119)8721:21<2502:OOAHLD>2.0.ZU;2-9

Abstract

A double-hyperfragment event has been found in a hybrid-emulsion experiment . It is identified uniquely as the sequential decay of He-6(Lambda Lambda) emitted from a Xi (-) hyperon nuclear capture at rest. ne mass of He-6(Lamb da Lambda) and the Lambda-Lambda interaction energy DeltaB(Lambda Lambda) h ave been measured for the first time devoid of the ambiguities due to the p ossibilities of excited states. The value of DeltaB(Lambda Lambda) is 1-01 0.20(-0.11)(+0.18) mev. This demonstrates that the Lambda-Lambda interactio n is weakly attractive.