Study of single particle and collective states in nuclei near drip lines

滴水线附近原子核中的单粒子和集体态研究

• 批准号: 09640369
• 负责人: SAGAWA Hiroyuki
• 金额: $ 1.73万
• 依托单位: UNIVERSITY OF AIZU
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640369/
• 关键词: Drip Line Nuclei; Giant Resonances; Effectine Charges; Gamow Teller State; Isobaric Gnalogue States; ハロー原子核; スキン原子核; ピグミー共鳴; 相対論的平均場近似; スピン軌道力; ガモフ、テラー状態

In this project, the following terms have been studied intensively :1) proton-neutron RPA response function and excited states in skin nuclei.The existence of thick skin has been observed in He-isotopes and A=20 isobars. In these nuclei, one-body field is very different from those of stable nuclei. For example, the radial dependence of the one-body potential is different from that of Woods-Saxon potential and rather close to harmonic oscillator one. In this study, the response of drip line nuclei ^<24>O, ^<48>Ni and ^<60>Ca have been studied especially focusing on the threshold strength.2) Pigmy resonances and Giant resonances in drip line nuclei We have studied dipole states of oxygen-isotopes in large scale shell model calculations. The calculated photoreaction cross sections in ^<16>O and ^<18>O give reasonable agreement with experimental observations both in the low energy region below hω=15 MeV and in the high energy giant resonance region (15 MeV<hω【less than or equal】30 MeV).3) Isospin violation and restoration in thermal compound systemsExplicit relations between the isospin mixing probability, the spreading width Γ^↓_<IAS> of the Isobaric Analog State (IAS) and the statistical decay width Γ_c of the compound nucleus at finite excitation energy, are derived by using the Feshbach projection.

在该项目中，对以下术语进行了深入的研究：1）皮肤核中质子中的RPA响应函数和激发态。在HE-同位素中已经观察到了厚皮肤的存在，A = 20同位体。在这些核中，一身场与稳定核的核场大不相同。例如，一身电位的径向依赖性不同于木材 - 撒克逊电位的依赖性，而与谐波振荡器相关。在这项研究中，已经研究了钻线核 ^<24> o， ^<48> ni和 ^<60> Ca的响应，特别关注阈值强度。2）小规模的共振和钻线核中的巨大共振，我们研究了大型壳模型计算中的氧气 - 异位型的偶极状态。在 ^<16> o和 ^<18>中计算出的光电反应横截面具有合理的一致性与实验性观察均低于HΩ= 15 MEV的低能区域和高能量巨型巨型共振区域（15 MeV <HΩ[小于或相等] 30 MEV）。通过使用Feshbach投影，得出了同异的类似状态（IAS）（IAS）和化合物核的统计衰变γ_C的γ^↓_ <ias>。

项目成果

C.A.Bertulani: "Energy Dependence of Breakup Cross Sections of Halo Nucleus ^8B" Physical Review. C57. 217-222 (1998)

C.A.Bertulani：“晕核分裂横截面的能量依赖性^8B”物理评论。

G.Colo: "Width of Isobaric Analog Resonance: A Microscopic Approach" Phys.Rev.C57. 3049-3054 (1998)

G.Colo：“等压模拟共振的宽度：微观方法”Phys.Rev.C57。

I.Hamamoto and H.Sagawa: "Response of light drip line nuclei to spin dependent operators"Phys.Rev.. C60. 064314-1-064314-7 (1999)

I.Hamamoto 和 H.Sakawa：“光滴线核对自旋相关算子的响应”Phys.Rev.. C60。

T.Minamizono: "Electromagnefic Moments of β- emltling Nucleus ^<19>O"Physical Letters. B457. 9-16 (1999)

T.Minamizono：“β-核磁矩 ^<19>O”《物理快报》B457（1999）。

H.Kitugawa: "Reaction Cross Sections and Radii of A=17 and A=20 isomers"Zeitschrift fur Physik. A358. 381-387 (1997)

H.Kitukawa：“A=17 和 A=20 异构体的反应截面和半径”Zeitschrift Fur Physik。