Giant monopole resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions

被引：42

作者：

Vesely, P. ^{[1
]}

Toivanen, J. ^{[1
]}

Carlsson, B. G. ^{[2
]}

Dobaczewski, J. ^{[1
,3
]}

Michel, N. ^{[1
]}

Pastore, A. ^{[4
]}

机构：

[1] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

[2] Lund Univ, LTH, Div Math Phys, S-22100 Lund, Sweden

[3] Univ Warsaw, Fac Phys, Inst Theoret Phys, PL-00681 Warsaw, Poland

[4] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

来源：

PHYSICAL REVIEW C | 2012年 / 86卷 / 02期

基金：

芬兰科学院;

关键词：

BREATHING-MODE; EQUATIONS; MATTER;

D O I：

10.1103/PhysRevC.86.024303

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Background: Following the 2007 precise measurements of monopole strengths in tin isotopes, there has been a continuous theoretical effort to obtain a precise description of the experimental results. Up to now, there is no satisfactory explanation of why the tin nuclei appear to be significantly softer than Pb-208. Purpose: We determine the influence of finite-range and separable pairing interactions on monopole strength functions in semimagic nuclei. Methods: We employ self-consistently the quasiparticle random phase approximation on top of spherical Hartree-Fock-Bogoliubov solutions. We use the Arnoldi method to solve the linear-response problem with pairing. Results: We found that the difference between centroids of giant monopole resonances measured in lead and tin (about 1 MeV) always turns out to be overestimated by about 100%. We also found that the volume incompressibility, obtained by adjusting the liquid-drop expression to microscopic results, is significantly larger than the infinite-matter incompressibility. Conclusions: The zero-range and separable pairing forces cannot induce modifications of monopole strength functions in tin to match experimental data.

引用

页数：9

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