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Second random-phase approximation with the Gogny force: First applications
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DOI：10.1103/PhysRevC.86.021304.png)
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We present the first applications of the second random-phase-approximation model with the finite-range Gogny interaction. We discuss the advantages of using such an interaction in this type of calculations where two-particle-two-hole configurations are included. The results found in the present work confirm the well-known general features of the second random-phase approximation spectra: We find a large shift, several MeV, of the response centroids to lower energies with respect to the corresponding random-phase-approximation values. As known, these results indicate that the effects of the one-particle-one-hole/two-particle-two-hole and two-particle-two-hole/two-particle-two-hole couplings are important. It has been found that the changes of the strength distributions with respect to the standard random-phase-approximation results are particularly large in the present case. This important effect is due to some large neutron-proton matrix elements of the interaction and indicates that these matrix elements (which do not contribute in the mean-field calculations employed in the conventional fit procedures of the force parameters) should be carefully constrained to perform calculations beyond the mean-field approach.
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IF:
3.4
论文数:
2.9W
被引数:
5.7W
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