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Experimental Study of Hyperon-Hyperon Interaction by Doubly Strange Nuclei

双奇异核超子-超子相互作用的实验研究

基本信息

批准号：
14340069
负责人：
NAKAZAWA Kazuma
金额：
$ 8.9万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340069/
关键词：
Doubly Strange Nuclei Double Hypernuclei Emulsion NAGARA event Weak Decay Automated speedy scanning system Brookhaven National Lab.J-PARC ダブルストレンジネス KEK-E373 エマルションハイブリッド実験全自動探索システム

项目摘要

For these three years, all the scanning was finished, and the scanning speed arrived at it than former 4times. As a result, an event to show an sequential decay topology of candidate double hypernucleus reached 7 examples and we succeeded in raising statistics for the past dozens of years to several times. Although it was unfortunate that the events which would be interpreted uniquely couldn't be found besides NAGARA event, it was an big result that we could know the useful information for theoretical calculation even by such events which would present multiple interpretations.On the other hand, we succeeded in discovery of the event which probably showed the emission and decay of a Σ^-hyperon from Ξ^-absorption point at a last stage of the scanning. The emission of Σ^-hyperon provides information for the mixing of ΞN⇔ΛΛ⇔ΣΣ and also gives us knowledge relating to H-dibaryon staying at the key position of the mixing. In addition, that is the first information about the weak interaction with double-strangeness, e. g. ΞN→ΣN, ΛΛ→ΣN. We are doing detailed analysis, now, and going to announce its result in the 2nd meeting by physics societies of Japan and USA held in September, this year.Furthermore, the proposed experiment giving us high statistics to Brookhaven Natl. Lab. (BNL) was accepted in the program advisory committee by speedup of the scanning. It would be proved that the successful improvement of scanning technology by this research was admitted. It was a big result we could suggest new experiments which would be available in near future in many domestic and foreign meetings based on that acceptance. These results were known by 12 articles in academic journals and 14 oral presentations in workshop (including 12 Int'l conferences).

在这三年里，所有的扫描都完成了，扫描速度达到了以前的40倍。结果表明，候选双超核序列衰变拓扑的事例达到7例，成功地将过去几十年的统计数字提高了几倍。虽然遗憾的是，除了NAGARA事件之外，没有发现可以唯一解释的事件，但即使是这样可以给出多种解释的事件，我们也可以知道对理论计算有用的信息，这是一个很大的结果。另一方面，我们成功地发现了一个事件，它可能显示了在扫描的最后阶段，一个π ^-超子从π ^-吸收点的发射和衰变。超子的发射提供了关于N-惠Λ Λ惠超子混合的信息，同时也提供了关于H-二重子在混合过程中处于关键位置的信息。另外，这也是关于双奇异弱相互作用的第一个信息。G. N →我们现在正在进行详细的分析，并将在今年9月举行的日本和美国物理学会第二次会议上公布结果。此外，拟议的实验给我们带来了布鲁克海文国家的高统计数据。实验室(BNL)通过加速扫描被程序顾问委员会接受。证明了本研究对扫描技术的成功改进。这是一个很大的成果，我们可以提出新的实验，这些实验将在不久的将来在许多国内外会议上进行。这些结果在学术期刊上发表了12篇文章，在14个研讨会（包括12个国际会议）上作了口头报告。