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초록
Bound systems of Xi(-)-N-14 are studied via Xi(-) capture at rest followed by emission of a twin single- Lambda hypernucleus in the emulsion detectors. Two events forming extremely deep Xi(-) bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as Xi(-) +N-14 -> He-5(Lambda) + He-5(Lambda) + He-4 + n. Since there are no excited states for daughter particles, the binding energy of the Xi(-) hyperon, B Xi(-), in the N-14 nucleus was uniquely determined to be 6.27 +/- 0.27MeV. Another Xi(-)-N-14 system via the decay Be-9(Lambda) +He-5(Lambda) + n brings a B Xi- value, 8.00 +/- 0.77MeV or 4.96 +/- 0.77MeV, where the two possible values of B Xi- correspond to the ground and the excited states of the daughter Be-9(Lambda) nucleus, respectively. Because the B(Xi-)values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear 1p state of the Xi(-)-N-14 system, these newevents give the first indication of the nuclear 1s state of the Xi hypernucleus, C-15(Xi).
키워드
- 제목
- First observation of a nuclear <i>s</i>-state of a Ξ hypernucleus,15ΞC
- 저자
- Yoshimoto, M.; Ahn, J. K.; Bassalleck, B.; Ekawa, H.; Endo, Y.; Fujita, M.; Han, Y.; Hashimoto, T.; Hayakawa, S. H.; Hicks, K.; Hoshino, K.; Hoshino, S.; Hwang, S. H.; Ichikawa, Y.; Ichikawa, M.; Imai, K.; Ishikawa, Y.; Kanauchi, H.; Kasagi, A.; Kim, S. H.; Kinbara, S.; Lin, P. M.; Ma, T. L.; Miwa, K.; Moe, A. T.; Nagase, Y.; Nakazawa, K.; Nanamura, T.; Naruki, M.; Nyaw, A. N. L.; Pochodzalla, J.; Sako, H.; Sato, S.; Soe, M. M.; Soe, M. K.; Sohn, J. Y.; Takahashi, H.; Takahashi, T.; Tamura, H.; Tanida, K.; Theint, A. M. M.; Tint, K. T.; Ukai, M.; Yamamoto, T. O.; Yang, S. B.; Yoon, C. S.; Yoshida, J.; Zhang, D. H.; Zhang, Z.
- 발행일
- 2021-07
- 유형
- Article
- 권
- 2021
- 호
- 7