1987 Fiscal Year Final Research Report Summary
Study of the Structure of High Spin States
| Project/Area Number |
61540197
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Institute of Physics, College of Arts and Sciences, University of Tokyo |
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Principal Investigator |
OHNISHI Naoki College of Arts and Sciences, University of Tokyo, 教養学部, 教授 (30016068)
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| Co-Investigator(Kenkyū-buntansha) |
ICHIMURA Munetake College of Arts and Sciences, University of Tokyo, 教養学部, 教授 (10012436)
TERASAWA Tokuo College of Arts and Sciences, University of Tokyo, 教養学部, 教授 (70012292)
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| Project Period (FY) |
1986 – 1987
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| Keywords | high spin isomer / proton-neutron interaction in high spin states / high K-isomer / K-isomerithm and gamma softness / Wobbling mode / 多体系の量子化 / TDHFの周期解 / 非可積分位相と量子化 |
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| Research Abstract |
The structure and the dynamics of high spin states associated with high-j orbitals are investiged. A possible mechanism for the phenomena of second backbending is rotation alignment of two protons and two neutrons of broken pair in the high-j orbitals and gives rise to formation of a new rotational band (t-band). The calculations carried out by utilizing the intermediate coupling model of particle system of teh high-j orbitals and the gamma-soft rotor shows that the proton-neutron interaction stabilized the t-band and keep their characteristic feature even in vrare states in the low spin side of the second band crossing angular momentum and that the band head becomes a high-spin isomer of about 3 nsec lifetime.
The isomer of 10^+ state in ^<184>Os isotope is considered to be a band head of high-K band consisting of two neutron in high-j orbital i_<13/2>. The observed lifetime is much shorter than the value estimated by a simple perturbation calculation for Coriolis force. By taking account gamma softness of the core the short lifetime is reproduced in terms of the intermediate coupling model. It is made clear that K-isomerism is strongly affected by the gamma softness. The wobbling mode considered to be important in high spin states is quantized in a semi-classical manner. A non-integrable phase is involved in the procedure of quatization. The phase is estimated by surface integral of the action flux. The phase is found interesting in the contex of the Berry phase.
A new algorithm is established to obtain periodic solutions of the time dependent Hartree-Fock equation, which are necessary in quatization of states following the prescription obtained through the path integral formalism.
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Research Products
(11 results)
