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Journal articles
Giant monopole resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions
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 208Pb. 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.
http://hal.in2p3.fr/in2p3-00730985
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Tuesday, September 11, 2012 - 3:59:23 PM
Last modification on : Tuesday, November 30, 2021 - 8:32:04 AM
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Tuesday, September 11, 2012 - 3:59:23 PM
Last modification on : Tuesday, November 30, 2021 - 8:32:04 AM
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