Properties of warm nuclei in the quasi-continuum

Guttormsen, M.; Agvaanluvsan, U.; Algin, E.; Bürger, A.; Larsen, A. C.; Mitchell, G. E.; Nyhus, H. T.; Siem, S.; Toft, H. K.; Voinov, A.

doi:10.1051/epjconf/20100204001

Cited by 2 publications

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References 8 publications

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“…For s-wave neutron resonances and assuming a major contribution from dipole radiation and parity symmetry for all excitation energies, the general expression in Eq. (23) will at S n reduce to…”

Section: Gamma-ray Strength Functions a Normalization And Experimenta...mentioning

confidence: 99%

“…A simple microscopic model [21][22][23] has been developed for further investigation of the underlying nuclear structure resulting in the measured level density functions. The model distributes Bardeen-Cooper-Schrieffer (BCS) quasi-particles on single-particle orbitals to make all possible proton and neutron configurations for a given excitation energy E. On each configuration, collective energy terms from rotation and vibration are schematically added.…”

Section: Nuclear Properties Extracted With a Combinatorial Bcs Modelmentioning

confidence: 99%

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Level densities andγ-ray strength functions in Sn isotopes

et al. 2010

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The nuclear level densities of 118,119 Sn and the γ-ray strength functions of 116,118,119 Sn below the neutron separation energy are extracted with the Oslo method using the ( 3 He, αγ) and ( 3 He, 3 He γ) reactions. The level density function of 119 Sn displays step-like structures. The microcanonical entropies are deduced from the level densities, and the single neutron entropy of 119 Sn is determined to be (1.7±0.2) k B . Results from a combinatorial model support the interpretation that some of the low-energy steps in the level density function are caused by neutron pair-breaking. An enhancement in all the γ-ray strength functions of 116−119 Sn, compared to standard models for radiative strength, is observed for the γ-ray energy region of (4 − 11) MeV. These small resonances all have a centroid energy of 8.0(1) MeV and an integrated strength corresponding to 1.7(9)% of the classical Thomas-Reiche-Kuhn sum rule. The Sn resonances may be due to electric dipole neutron skin oscillations or to an enhancement of the giant magnetic dipole resonance.

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Section: Gamma-ray Strength Functions a Normalization And Experimenta...mentioning

confidence: 99%

Section: Nuclear Properties Extracted With a Combinatorial Bcs Modelmentioning

confidence: 99%

Level densities andγ-ray strength functions in Sn isotopes

et al. 2010

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Polarizability effects in atomic nuclei

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2020

Int. J. Mod. Phys. E

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This work sheds light upon how the atomic nucleus polarizes throughout the nuclear chart. Deviations from the well-known behavior of the nuclear dipole polarizability — which smoothly increases with increasing atomic mass number — are investigated. Relative enhancements are found for light nuclei as the nuclear symmetry energy decreases and, within a nucleus, as its excitation energy increases. These two properties are related by a diminishing binding energy of the nuclear system. Contrarily, hindrances of nuclear polarizability are observed in the photo-neutron cross-section data and photon-strength functions of semi-magic nuclei with [Formula: see text], 50 and 82, which support the presence of shell effects at low-lying excitations and — assuming validity of the Brink-Axel hypothesis — at high-excitation energies up to the quasi-continuum region. These features assign the nuclear dipole polarizability as a sensitive measure of the long-range correlations of the nuclear force, and provide a new spectroscopic probe to investigate collective phenomena, shell closures, and the elusive nuclear symmetry energy. Particular cases of quadrupole collectivity are also discussed in terms of the available, and yet so scarce, information on nuclear polarizability (e.g. Sn and Ni isotopes).

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Properties of warm nuclei in the quasi-continuum

Cited by 2 publications

References 8 publications

Level densities andγ-ray strength functions in Sn isotopes

Level densities andγ-ray strength functions in Sn isotopes

Polarizability effects in atomic nuclei

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