dorsal/arxiv
View SchemaRelativistic QRPA description of isoscalar compression modes in open-shell nuclei in the A$\approx$60 mass region
| Authors | N. Paar, D. Vretenar, T. Niksic, P. Ring |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0606054 |
| URL | https://arxiv.org/abs/nucl-th/0606054 |
| DOI | 10.1103/PhysRevC.74.037303 |
| Journal | Phys.Rev. C74 (2006) 037303 |
Abstract
Very recent inelastic $\alpha$-scattering data on the isoscalar monopole and dipole strength distributions in $^{56}$Fe, $^{58}$Ni, and $^{60}$Ni are analyzed in the relativistic quasiparticle random-phase approximation (RQRPA) with the DD-ME2 effective nuclear interaction (nuclear matter compression modulus K$_{nm}= 251$ MeV). In all three nuclei the calculation nicely reproduces the observed asymmetric shapes of the monopole strength, and the bimodal structure of the dipole strength distributions. The calculated centroid and mean energies are in very good qualitative agreement with the experimental values both for the monopole, and for the low- and high-energy components of the dipole transition strengths. It is noted, however, that while DD-ME2 reproduces in detail the excitation energies of the giant monopole resonances (GMR) in nuclei with $A \ge 90$, the theoretical centroids are systematically above the experimental values in lighter nuclei with $A \leq 60$. The latter can be reproduced with an effective interaction with a lower value of K$_{nm} \approx $ 230 MeV but, because of the asymmetric shapes and pronounced fragmentation of the monopole strength distributions, isoscalar GMR data in light nuclei cannot provide accurate estimates of the nuclear matter compression modulus.
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"abstract": "Very recent inelastic $\\alpha$-scattering data on the isoscalar monopole and\ndipole strength distributions in $^{56}$Fe, $^{58}$Ni, and $^{60}$Ni are\nanalyzed in the relativistic quasiparticle random-phase approximation (RQRPA)\nwith the DD-ME2 effective nuclear interaction (nuclear matter compression\nmodulus K$_{nm}= 251$ MeV). In all three nuclei the calculation nicely\nreproduces the observed asymmetric shapes of the monopole strength, and the\nbimodal structure of the dipole strength distributions. The calculated centroid\nand mean energies are in very good qualitative agreement with the experimental\nvalues both for the monopole, and for the low- and high-energy components of\nthe dipole transition strengths. It is noted, however, that while DD-ME2\nreproduces in detail the excitation energies of the giant monopole resonances\n(GMR) in nuclei with $A \\ge 90$, the theoretical centroids are systematically\nabove the experimental values in lighter nuclei with $A \\leq 60$. The latter\ncan be reproduced with an effective interaction with a lower value of K$_{nm}\n\\approx $ 230 MeV but, because of the asymmetric shapes and pronounced\nfragmentation of the monopole strength distributions, isoscalar GMR data in\nlight nuclei cannot provide accurate estimates of the nuclear matter\ncompression modulus.",
"arxiv_id": "nucl-th/0606054",
"authors": [
"N. Paar",
"D. Vretenar",
"T. Niksic",
"P. Ring"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.74.037303",
"journal_ref": "Phys.Rev. C74 (2006) 037303",
"title": "Relativistic QRPA description of isoscalar compression modes in open-shell nuclei in the A$\\approx$60 mass region",
"url": "https://arxiv.org/abs/nucl-th/0606054"
},
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