Production of Light Single-LAMBDA and Double-LAMBDA Hypernuclei in XI^- Atomic Capture Reaction

XI^- 原子捕获反应中轻单 LAMBDA 和双 LAMBDA 超核的产生

• 批准号: 06640415
• 负责人: YAMADA Taiichi
• 金额: $ 1.41万
• 依托单位: Kanto Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06640415/
• 关键词: Hypernuclei; Hyperon; Strangeness; Nuclear theory; Atomic capture reaction; Double-LAMBDA hypernucleus; Nuclear deep-hole state; Selection rule; ハイパー核; ストレンジネス; ダブルラムダ核; 核反応; グナイ粒子

1) The production rates per XI for the LAMBDALAMBDA^<12>Be+p, LAMBDALAMBDA^<12>B+n, LAMBDALAMBDA^<11>Be+d, LAMBDALAMBDA^9Li+alpha, LAMBDALAMBDA^<10>Be+t, LAMBDALAMBDA^6He+^7Li, LAMBDALAMBDA^5He+^8Be, LAMBDA^8Li+LAMBDA^5He, LAMBDA^9Be+LAMBDA^4H and LAMBDA^<12>B+LAMBDA channels (including their excited channels) via the ^<12>C-XI^- atomic states have investigated within the fame of the doorway double-LAMBDA hypernuclear picture (direct reaction picture). We found that in the stopped XI^- reaction the excited double-LAMBDA hypernuclear states for LAMBDALAMBDA^<12>B,LAMBDALAMBDA^<12>Be and LAMBDALAMBDA^<11>Be are greatly produced via the resonant states of the final double-LAMBDA hypernuclear channels. The following sequential process is possible ; (^<12>C,XI^-) atom * LAMBDALAMBDA^<12>B^<**>+n * LAMBDALAMBDA^<11>Be+p+n or LAMBDALAMBDA^<11>B+n+n. This process is similar to the sequential process for LAMBDALAMBDA^<13>B production observed in the KEK-E176 experiment, (^<14>N,XI^-) atom ** LA … More MBDALAMBDA^<14>C^*+n * LAMBDALAMBDA^<13>B+p+n. The calculated double-LAMBDA sticking probability is about 5 %, which is in correspondence to the experimental data.2) The excitation functions of the ^9Be(K^-, K^+)XI^9He reaction at P_K=1.6 GeV/c and rheta=0ﾟwere ecaluated with the Woods-Saxon type (VO=-24 and -16 MeV) and folding-type (YNG-ND No.1 and No.2) XI^--^8Linuclear potentials. The XI^--^8Li nuclear potentials except the folding potential (YNG-ND No.1) gives a broad peak at the XI bound-state region, which cross section is 0.02 - 0.08mub (0.2nb for YNG-ND No.1). The peak consists of the three component coming from the three XI^9He bound states. We estimated the production cross section of XI^9He (g.s.) * LAMBDALAMBDA^8He + n for the XI^--^8Li nuclear potentials. The calculated production rates were about 0.4%, and then, the production cross sections were 0.03 - 0.1 nb (0.3 pb) for the XI^--^8Li nuclear potentials except the folding potential (YNG-ND No.1)3) A selection rule for fragmentations of doorway s-hole states in light nuclei was given. In the two-body fragmentation process of the doorway s-hole states in light nuclei, smaller fragments than the alpha particle (p, n, d, t, and 3He) are allowed, while the fragments such as the alpha particle and the larger particles are forbidden, in spite of the fact that the Q value for the alpha fragment is similar to or even larger than those for the p, n, and d fragments. The selection rule comes from the spatial symmetry of the dooray s-hole states, The spectroscopic factors and partial widths for the two-body fragmentations of the s-hole of ^<11>B and ^<15>N are calculated to show the selection rule. The calculated escaping widths for the ^1B (s-hole) and ^<15>N (s-hole) doorway states are ingood correspondence with the experimental widths. This may suggest that the following scenario is realized ; in the light nuclei the fragmentation process of the s-hole state in the doorway stage is superior or competitive to that in the compound nuclear stage. Less

1）lambdalambda^<2> lambdalambda^<2> lambdalambda^<11> be+d，lambdalambda^<11> lambdalambda^<11> lambdalambda^<10> be+t，lambdalambda lambda^8li^5he，lambda^9be+lambda^4h和lambda^<2> b+lambda annels（包括他们激动的频道）通过^<2> c-xi^ - 原子状态进行了调查。超核图片n停止的XI^ - 反应Lambdalambda^<2> b，Lambdalambda^<11> be是通过最终的双lambda超核通道的谐振状态产生的。可能;（^<12> c，xi^ - ）原子 * lambdalambda^<11>+n * lambdalambda^<11> be+p+n。 ，（^14> n，xi^ - ）原子** la…更多mbdalambda^<14> c^+n。 k^ - ，k^+）xi^9He在p_k = 1.6 gev/c和rheta = 0゜与木材 - 撒克逊人类型（vo = -24 and-16 meV）和折叠型（yng-nd No.） 1和No.2）xi^ - ^8linucles xi^ - ^8li核电位除了折叠电势（YNG-ND No.1）在XI结合状态区域给出了BOAD峰，该区域的交叉截面为0.02。 08MUB（YNG-ND No.1的0.2NB）。 Xi^ - ^8LI核电位。钙的生产率约为0.4％，生产横截面为0.03-0.1 Nb（0.3 pb），XI^ - ^8li核电位折叠l（YNG-ND No.1） ）3）允许使用Alpha粒子（p，n，d，t，t和3he）的门口s孔碎裂的选择规则。被禁止，尽管Q S类似于p，n和d片段的Q，但选择规则来自 ^<11> b和 ^<15>的门。 n被钙化以显示 ^1b（S孔）和 ^<15> n（s-hole）门口的计算出的宽度。在门口阶段的S孔状态的过程中是较少的。

项目成果

T.Yamada: "Double-Λ,Twin-Λ and Single-Λ Hypernuclear Production for Stopped Ξ^-Particle in ^<12>C" Preprint KGU-P9601 (Kanto Gakuin University). (1996)

T.Yamada：“^12C 中停止的 Ξ^ 粒子的双Λ、双Λ 和单Λ 超核生产”预印本 KGU-P9601（关东学院大学）（1996 年）。

T.Yamada and Y.Yamamoto: "SIGMA^- atoms and ^4_MAHe Hypernucleus with SIGMA-N Interactions" Progress of Theoretical Physics Supplement. No.117. 241-250 (1994)

T.Yamada 和 Y.Yamamoto：“SIGMA^- 原子和 ^4_MAHe 超核与 SIGMA-N 相互作用”理论物理进展补充。

T.Yamada: "Double -LAMBDA and Twin-LAMBDA Hypernuclear Production in XI^--atomic Capture into ^<12>C" Genshikaku Kenkyuu. 40. 23-25 (1995)

T.Yamada：“XI^-原子捕获到 ^<12>C 中的双 LAMBDA 和双 LAMBDA 超核生产”Genshikaku Kenkyuu。

T.Yamada and K.Ikeda: "Double-LAMBDA Hypernuclear Production via XI Hypernuclear States in the ^9Be (K^-, K^+) XI^9He reaction" Preprint KGU-P9602 (Kanto Gakuin University). (1996)

T.Yamada 和 K.Ikeda：“^9Be (K^-, K^ ) XI^9He 反应中通过 XI 超核状态产生双 LAMBDA 超核”预印本 KGU-P9602（关东学院大学）。

T.Yamada: "Resonances of Nuclear Cluster Systems with Complex-Scaled Resonating Group Method" The Journal of Thechnological Researches,The College of Engineering,Kanto Gakuin University. 38. 37-45 (1995)

T.Yamada：“Resonances of Nuclear Cluster Systems with Complex-Scales Resonating Group Method”《技术研究杂志》，关东学院大学工学院。