Nuclear capture at rest of Ξ− hyperons

Nuclear capture at rest of Ξ− hyperons
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Ξ−超子静止时的核捕获

DOI：
10.1016/j.nuclphysa.2009.07.005
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发表时间：
2009
期刊：
Nuclear Physics
影响因子：
--
通讯作者：
C. Yoon
C. Yoon
中科院分区：
--
文献类型：
--
作者：
S. Aoki;S. Bahk;S. Chung;H. Funahashi;C. Hahn;M. Hanabata;T. Hara;S. Hirata;K. Hoshino;K. Hoshino;M. Ieiri;T. Iijima;K. Imai;Y. Itow;T. Jin;M. Kazuno;C. Kim;J. Kim;S. Kim;K. Kodama;T. Kuze;Y. Maeda;A. Masaike;A. Masuoka;Y. Matsuda;A. Matsui;Y. Nagase;C. Nagoshi;M. Nakamura;S. Nakanishi;T. Nakano;K. Nakazawa;K. Niwa;H. Oda;H. Okabe;S. Ono;R. Ozaki;B. Park;I. G. Park;K. Sakai;T. Sasaki;Y. Sato;H. Shibuya;H. Shimizu;J. Song;M. Sugimoto;H. Tajima;H. Takahashi;R. Takashima;F. Takeutchi;Kazuhiro Tanaka;M. Teranaka;I. Tezuka;H. Togawa;T. Tsunemi;M. Ukai;N. Ushida;T. Watanabe;N. Yasuda;J. Yokota;C. Yoon

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进行乳液计数器混合实验（KEK E176）来寻找双奇异系统，例如双-{lambda}超核和H-二重子。 (K{sup -}, K{sup +}) 反应中产生的超过 10% 的 {xi}{sup -} 超子静止在核乳液中。我们已经获得了本报告中描述的 98 个在 {xi}{sup -} 超子静止时的核俘获候选事件。其中，四个事件被确定为双 λ 超核的连续弱衰变。已估计了从捕获点背靠背发射孪生单 lambda 超核的两个事件的 {xi}{sup -}-({sup 12}C、{sup 14}N 和 {sup 16}O) 态的结合能。在捕获点附近搜索了 H-二重子的 {sigma}{sup -}p 衰变顶点，但没有观察到任何证据。在 90% 置信水平下，对于小于 0.1 ns 的寿命，H 发射分支比的上限为 5-10%。研究了静止状态捕获 {xi}{sup -} 后核碎片的单陌生和双陌生的捕获概率。
An emulsion-counter hybrid experiment (KEK E176) was carried out to search for double strangeness systems such as double-{lambda} hypernuclei and H-dibaryons. More than 10% of {xi}{sup -} hyperons produced in the (K{sup -}, K{sup +}) reaction were brought to rest in the nuclear emulsion. We have obtained 98 candidate events of nuclear capture at rest of {xi}{sup -} hyperons which are described in this report. Among those, four events were identified as sequential weak decay of double-{lambda} hypernuclei. The binding energies of {xi}{sup -}-({sup 12}C, {sup 14}N and {sup 16}O) states have been estimated for two events which emit twin single-{lambda} hypernuclei back to back from the capture point. The {sigma}{sup -}p decay vertex of an H-dibaryon was searched for near the capture point and no evidence was observed. Upper limits for the branching ratio of H emission are 5-10% for a lifetime less than 0.1 ns at the 90% confidence level. The trapping probabilities of single and double strangeness to a nuclear fragment following {xi}{sup -} capture at rest have been studied.