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.
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页数：9
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