Calculation of Gamow-Teller β-strength functions in the rubidium region in the RPA approximation with Nilsson-model wave functions

Krumlinde, J.; Möller, P.

doi:10.1016/0375-9474(84)90406-8

Cited by 173 publications

(129 citation statements)

References 13 publications

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“…Since then, improvements in the weak rates have been focused on the description of the nuclear-structure aspect of the problem. Different approaches are found in the literature and can be roughly divided into shell model (SM) [7][8][9][10] and proton-neutron quasiparticle random-phase approximation (QRPA) [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] categories. Hybrid models using RPA methods on top of a temperature-dependent description of the parent nucleus using a shell-model Monte Carlo approach have also been developed to calculate stellar EC rates [26].…”

Section: Introductionmentioning

confidence: 99%

Contribution of excited states to stellar weak-interaction rates in odd-Anuclei

Sarriguren¹

2016

Phys. Rev. C

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Weak-interaction rates, including β decay and electron capture, are studied in several odd-A nuclei in the pf -shell region at various densities and temperatures of astrophysical interest. Special attention is paid to the relative contribution to these rates of thermally populated excited states in the decaying nucleus. The nuclear structure involved in the weak processes is studied within a quasiparticle random-phase approximation with residual interactions in both particle-hole and particle-particle channels on top of a deformed Skyrme Hartree-Fock mean field with pairing correlations. In the range of densities and temperatures considered, it is found that the total rates do not differ much from the rates of the ground state fully populated. In any case, the changes are not larger than the uncertainties due to the nuclear-model dependence of the rates.

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Section: Introductionmentioning

confidence: 99%

Contribution of excited states to stellar weak-interaction rates in odd-Anuclei

Sarriguren¹

2016

Phys. Rev. C

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“…The average difference between the mean proton energies x • of the odd-odd and even-odd spectra is 1. 7 5 . MeV which is expected since the pairing gap z is A = 12/SA, and thus 2A is ~2 MeV in 5 ' this region.…”

Section: Results: Closed Shell Regionmentioning

confidence: 99%

“…Without detailed knowledge of S^ either from experiments such as total absorption 7-ray spectroscopy or from theory it is rarely possible to repro duce the correct centroid and shape of the proton spectrum -simultaneously with b p , the half-life, and to some extent the final state proton branching ratios. Since no S,j measurements in our region of interest are available (except for 147m Dy 6 ) we have performed calculations of GT /^-strength functions using deformed Nilsson model wave functions in a modified oscillator potential 7 . Pairing is treated in BCS approximation.…”

Section: Introductionmentioning

confidence: 99%

Beta-delayed proton decay in the lanthanide region

Nitschke¹,

Wilmarth²,

Gilat³

et al. 1987

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A total of 24 new /^-delayed proton precursors and several new decay branches in the region of 56 < Z < 72 and N < 82 have been identified with the OASIS on-line mass separator facility at the SuperHILAC in Berkeley. Proton spectra and halflives were measured for all precursors. Additional properties determined for many of the isotopes include spins and parities of the precursors, final state feedings, proton branching ratios, (Qsc-Sp) energy differences, and new levels in the proton decay daughters. Mixed /?-delayed proton decay from precursor isomers and ground states has been observed. The proton decay has been compared to statistical model calculations using Gamow -Teller (GT) /7-strength functions obtained from RPA calculations with Nilsson model wave functions. For the N = 81 precursors 151 Yb, '^Er, and ""Dy, pronounced structure in the proton spectra has been observed. An interpretation of this structure in the framework of "doorway" states is proposed.

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“…Figure 1 shows the systematic trend of half-lives as a function of neutron number for the Pm, Pr, Nd, Ce, La, Ba [5] in comparison with the prediction of two theoretical models. One is the KTUY mass formula [6] combined with a gross theory of β -decay (GT) [7], and the other is Finite Range Droplet mass model (FRDM) [8] combined with the deformed quasi particle random phase approximation (QRPA) [9]. As shown in the figure, the difference between the prediction of two theoretical models are large, ranging in some cases up to one order of magnitude (see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…[5]. Half-lives predicted by two theoretical models FRDM+QRPA [8,9] and KTUY+GT [6,7] are shown in green and red, respectively.…”

Section: Introductionmentioning

confidence: 99%

β-decay of neutron-rich Z∼60 nuclei and the origin of rare earth elements

Nishimura

Lorusso

et al. 2014

AIP Conference Proceedings

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Abstract. A large fraction of the rare-earth elements observed in the solar system is produced in the astrophysical rapid neutron capture process (r-process). However, current stellar models cannot completely explain the relative abundance of these elements partially because of nuclear physics uncertainties. To address this problem, a β -decay spectroscopy experiment was performed at RI Beam Factory (RIBF) at RIKEN, aimed at studying a wide range of very neutron-rich nuclei with Z∼60 that are progenitors of the rare-earth elements with mass number A∼160. The experiment provides a test of nuclear models as well as experimental inputs for r-process calculations. This contribution presents the experimental setup and some preliminary results of the experiment.

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Calculation of Gamow-Teller β-strength functions in the rubidium region in the RPA approximation with Nilsson-model wave functions

Cited by 173 publications

References 13 publications

Contribution of excited states to stellar weak-interaction rates in odd-Anuclei

Contribution of excited states to stellar weak-interaction rates in odd-Anuclei

Beta-delayed proton decay in the lanthanide region

β-decay of neutron-rich Z∼60 nuclei and the origin of rare earth elements

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