高温における巨大共鳴幅の振る舞い(原子核における散逸・拡散・揺らぎの理論,研究会報告)

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rights: 素粒子論グループ素粒子研究編集部rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf:http://ci.nii.ac.jp/naid/110006413333/The physical content of the giant resonance(GR) width is nivestigated based on the fully microscopic theory [i.e. the thermal RPA(TRPA) on top of the thermal HFB(THFB)]. The experimental FWHM is interpreted as the total width obtained by folding both strength distributions with the fragmentation width due to the p-h RPA states, Γ_f, and the spreading width due to the 2p-2h states, Γ^↓. In the high temperature limit, the temperature-dependence of these widths are estimated as Γ_f α(kT)^<-3/2> and Γ^↓ α(kT)^<-3/2>, which indicate that the saturation of the width takes place at moderately high tempetatures before the occurence of the motional narrowing of the GDR width expected at very high temperatures. Usefulness of the microscopic treatment is demonstrated also in the calculation of the anisotropy coefficient of gamma-ray angular distribution from the decay of the GDR built on the hot rotating nucleus. It is stressed that fluctuation of physical quantities can be correctly calculated within the framework of mean field approximation for microscopic theory.
素粒子論グループ素粒子研究編集部の論文
1994-10-20