Microscopic Study of Neutron-rich Nuclei

富中子核的显微研究

• 批准号: 63540206
• 负责人: SAGAWA Hiroyuki
• 金额: $ 1.28万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540206/
• 关键词: Neutron-rich Nuclei; Heavy-ion Collisions; Glauber Model; Shell Model; Giant Resonances; Direct Reaction Model; ザ-バ-模型; グラウバー模型; ハートリー・フォック模型; 磁気的形状因子

In the years of 1988 and 1989, we studied medium and high-energy heavyーion collisions by using Glauber Model. As a projectile, we adopted radio-active nuclei like ^<11>Li and ^<11>Be. We showed that the wave functions which take into account the small separation energy effect can describe well the reaction cross sections. The projectile fragmentation process also studied by using a new direct reaction model, and the momentum dependence of the cross section of ^<11>Be -> ^<10>Be + n can be reproduced by the wave function with the halo character. The possibility of super-deformation in ^<11>Be is neglected.In the years of 1990, we studied especially the low excited resonances in ^<11>Li and ^<11>Be. The dipole resonance in ^<11>Li is found at the excitation energy Ex 1 MeV with the significant portion of the sum rule value. The spin dependent dipole strengths are also enhanced in ^<11>Be at rather low excitation energy. The experimental evidence of these resonances is found recently by the single-charge and the double charge exchange reactions. We also pointed out a possible bunching of several different multipole resonances near the threshold energy of halo nuclei.

1988年和1989年，我们用Glauber模型研究了中高能重离子碰撞。作为抛射体，我们采用了像^ Li和^ Be这样的放射性原子核<11><11>。结果表明，考虑小分离能效应的波函数能较好地描述反应截面。用一个新的直接反应模型研究了弹丸的碎裂过程，<11><10>用具有晕特征的波函数再现了^ Be -&gt; ^ Be + n碰撞截面的动量依赖关系。在<11>1990年，我们特别研究了^ Li和^ Be的低激发共振<11><11>。在<11>激发能Ex 1 MeV处发现^ Li中的偶极共振，具有求和规则值的显著部分。在相当低的激发能下，~（13）Be的自旋相关偶极强度也得到增强<11>。这些共振的实验证据最近被发现的单电荷和双电荷交换反应。我们还指出了在晕核阈能附近可能存在的几种不同多极共振的聚束现象。

项目成果

M.Arima: "Kaonーnucleon interaction and excited hyperons" Nucl.Phys.A. 506. 553-564 (1990)

M.Arima：“Kaon 核子相互作用和激发超子”Nucl.Phys.A 506. 553-564 (1990)

H.Sagawa: "Momentum distributions of looselyーbound neutrons with peripheral direct reaction model" Phys.Lett.B. 244. 149-154 (1990)

H.Sakawa：“具有外围直接反应模型的松散束缚中子的动量分布”Phys.Lett.B. 244. 149-154 (1990)

鈴木俊夫: Phys.Rev.C. 37. 549-552 (1988)

铃木敏夫：Phys.Rev.C. 37. 549-552 (1988)

H.Sagawa: "Sum rule approach for decoupled dipole mode" Phys.Lett.B. 251. 17-22 (1990)

H.Sakawa：“解耦偶极子模式的求和法则方法” Phys.Lett.B。

M. Arima: "Kaon-nucleon interaction and excited hyperons" Nucl. Phys. A. 506. 553-564 (1990)

M. Arima：“Kaon 核子相互作用和激发超子”Nucl。