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

Vesely, P.; Toivanen, J.; Carlsson, Gillis LU ; Dobaczewski, J.; Michel, N. and Pastore, A. (2012) In Physical Review C (Nuclear Physics) 86(2).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C (Nuclear Physics)
volume
86
issue
2
publisher
American Physical Society
external identifiers
  • wos:000307274500003
  • scopus:84864634200
ISSN
0556-2813
DOI
10.1103/PhysRevC.86.024303
language
English
LU publication?
yes
id
a51732e9-7ec6-4d72-9dba-ab5ff815d63c (old id 3070133)
date added to LUP
2012-09-26 08:28:55
date last changed
2017-11-05 04:04:21
@article{a51732e9-7ec6-4d72-9dba-ab5ff815d63c,
  abstract     = {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.},
  articleno    = {024303},
  author       = {Vesely, P. and Toivanen, J. and Carlsson, Gillis and Dobaczewski, J. and Michel, N. and Pastore, A.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Giant monopole resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions},
  url          = {http://dx.doi.org/10.1103/PhysRevC.86.024303},
  volume       = {86},
  year         = {2012},
}