Giant spin resonances and effective Mλg-factors

Castel, B.; Hamamoto, I.

doi:10.1016/0370-2693(76)90526-8

Cited by 44 publications

(11 citation statements)

References 21 publications

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“…The corresponding values of κ (01) 1 and k (21) 1 are in agreement with the rough estimates in Ref. [42]. The spin-quadrupole interaction weakly affects the GT strength distributions.…”

Section: Iron Isotopessupporting

confidence: 85%

Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

et al. 2010

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We propose a new method to calculate stellar weak-interaction rates. It is based on the thermofield dynamics formalism and allows calculation of the weak-interaction response of nuclei at finite temperatures. The thermal evolution of the GT + distributions is presented for the sample nuclei 54,56 Fe and 76,78,80 Ge. For Ge we also calculate the strength distribution of first-forbidden transitions. We show that thermal effects shift the GT + centroid to lower excitation energies and make possible negative-and low-energy transitions. In our model we demonstrate that the unblocking effect for GT + transitions in neutron-rich nuclei is sensitive to increasing temperature. The results are used to calculate electron capture rates and are compared to those obtained from the shell model.

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“…The corresponding values of κ (01) 1 and k (21) 1 are in agreement with the rough estimates in Ref. [42]. The spin-quadrupole interaction weakly affects the GT strength distributions.…”

Section: Iron Isotopessupporting

confidence: 85%

Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

et al. 2010

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“…For example, this was found already in one of the first papers on the subject Ref. [40], where the distributions of the electric E1 and E3 transitions at T = 0 in 208 Pb were calculated and in many subsequent studies (see, e.g., [10,11,41]. The same effect is predicted for the charge-exchange allowed and first-forbidden transitions as well [17,27].…”

Section: B Finite Temperaturessupporting

confidence: 57%

“…However, being applied to hot nuclei, this method has its own shortcomings mainly because it partially employs the Brink hypothesis when treating GT 0 transitions from nuclear excited states. As follows from experimental studies of giant dipole resonances (GDR) in hot nuclei, the GDR strength function exhibits a temperature dependence (see, e.g., the monograph [10] and one of the latest reviews [11]), i.e., the validity of the Brink hypothesis is not obvious. Moreover, theoretical calculations performed for charge-exchange GT transitions in the framework of the shell-model Monte Carlo (SMMC) method demonstrate that with increasing temperature the GT centroid shifts to lower energies and the width of the distribution increases with the appearance of low-lying states [12].…”

Section: Introductionmentioning

confidence: 99%

Inelastic neutrino scattering off hot nuclei in supernova environments

Dzhioev¹,

Vdovin²,

Wambach

et al. 2014

Phys. Rev. C

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We study inelastic neutrino scattering off hot nuclei for temperatures relevant under supernova conditions. The method we use is based on the quasiparticle random phase approximation extended to finite temperatures within the thermo field dynamics (TQRPA). The method allows a transparent treatment of upward and downward transitions in hot nuclei, avoiding the application of Brink's hypothesis. For the sample nuclei 56 Fe and 82 Ge we perform a detailed analysis of thermal effects on the strength distributions of allowed Gamow-Teller (GT) transitions which dominate the scattering process at low neutrino energies. For 56 Fe and 82 Ge the finite temperature cross-sections are calculated by taking into account the contribution of allowed and forbidden transitions. The observed enhancement of the cross-section at low neutrino energies is explained by considering thermal effects on the GT strength. For 56 Fe we compare the calculated cross-sections to those obtained earlier from a hybrid approach that combines large-scale shell-model and RPA calculations.

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“…The fact that these constants came out to be close to the HO values [35] reflects the essential self-consistent character of our approach. The strengths of the spin-spin interaction, the only ones left out, were fixed in the standard way [35,60]. Finally, we used bare charges for the Eλ transitions and a quenching factor g s = 0.7 for the spin gyromagnetic ratios.…”

Section: Rpa Analysis Of Nd Bandsmentioning

confidence: 99%

Microscopic structure of deformed and superdeformed collective bands in rotating nuclei

et al. 2007

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We investigate in self-consistent cranked Nilsson plus quasiparticle random-phase approximation the structure of 190,192,194Hg in their evolution from normal to superdeformation and from low to high rotational frequencies. The analysis of the energy levels suggests a splitting of few normally deformed bands into two or more branches. The investigation of the dynamical moments of inertia supports the octupole character of the low-lying negative parity superdeformed bands, in agreement with previous theoretical predictions and experimental findings. As a more direct confirm of their octupole nature, we obtain strong E1 transitions linking those bands to the yrast superdeformed band, in agreement with experiments. A similar result is shown to hold also for 152Dy. Like in 152Dy, the collectivity of the low-lying scissors mode gets enhanced with the onset of superdeformation

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Giant spin resonances and effective Mλg-factors

Cited by 44 publications

References 21 publications

Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

Gamow-Teller strength distributions at finite temperatures and electron capture in stellar environments

Inelastic neutrino scattering off hot nuclei in supernova environments

Microscopic structure of deformed and superdeformed collective bands in rotating nuclei

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