<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay properties of neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes from deformed quasiparticle random-phase approximation

Sarriguren, P.

doi:10.1103/physrevc.91.044304

Cited by 49 publications

(24 citation statements)

References 76 publications

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“…The potential energy curves calculated in Ref. [59] show two minima for even-even palladium isotopes from A = 114 to A = 118. Prolate-type deformation is predicted for ground states and an oblate-type for the isomers in Pd isotopes [59,60].…”

Section: Properties Of States and Deformations In 117 Pdmentioning

confidence: 93%

“…[59] show two minima for even-even palladium isotopes from A = 114 to A = 118. Prolate-type deformation is predicted for ground states and an oblate-type for the isomers in Pd isotopes [59,60]. Deformed shell-model calculations for eveneven palladium isotopes [1] predict quadrupole deformation with β 2 > 0.2.…”

Section: Properties Of States and Deformations In 117 Pdmentioning

confidence: 96%

“…In many theoretical works [2,40,[59][60][61], two potential minima for a prolate and an oblate shape, as well as a triaxial shape, are predicted in the palladium nuclei in the A = 110-120 region. The potential energy curves calculated in Ref.…”

Section: Properties Of States and Deformations In 117 Pdmentioning

confidence: 99%

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Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

et al. 2018

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Monoisotopic samples of exotic, neutron-rich 117 Rh nuclei, produced in the proton-induced fission of 238 U and separated using the IGISOL mass separator coupled to the JYFLTRAP Penning trap, were used to perform β and γ coincidence spectroscopy of 117 Pd. The spin parity of the ground state of 117 Pd was determined to be 1/2 + and the 19.1 ms isomer at 203.2 keV was assigned a spin-parity 7/2 − . The 117 Rh β − -decay scheme was considerably extended, and various sequences of the levels were interpreted as resulting from the prolate, oblate, and triaxial nuclear shapes. Some of the β − decays were considered as the allowed Gamow-Teller transitions. The experimental distribution of Gamow-Teller strength is discussed.

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Section: Properties Of States and Deformations In 117 Pdmentioning

confidence: 93%

Section: Properties Of States and Deformations In 117 Pdmentioning

confidence: 96%

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Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

et al. 2018

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“…Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. structure [9][10][11][12][13]. This relationship is particularly strong for nuclei close to shell closures.…”

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confidence: 90%

Evidence for Gamow-Teller Decay ofNi78Core from Beta-Delayed Neutron Emission Studies

et al. 2016

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The β-delayed neutron emission of 83;84 Ga isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the β decay of midmass nuclei. The large decay strength deduced from the observed intense neutron emission is a signature of Gamow-Teller transformation. This observation was interpreted as evidence for allowed β decay to 78 Ni core-excited states in 83;84 Ge favored by shell effects. We developed shell model calculations in the proton fpg 9=2 and neutron extended fpg 9=2 þ d 5=2 valence space using realistic interactions that were used to understand measured β-decay lifetimes. We conclude that enhanced, concentrated β-decay strength for neutron-unbound states may be common for very neutron-rich nuclei. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models. DOI: 10.1103/PhysRevLett.117.092502 β-delayed neutron emission from fission fragments was first observed in 1939 following the neutron bombardment of uranium salts [1]. It was recognized that the delayed neutron energies and emission probabilities, P n , are important parameters to model environments that involve neutron-rich isotopes. Two of the main applications are in nuclear reactor physics [2] and r-process nucleosynthesis [3]. Because β-delayed neutron precursors are neutron rich and far from stability, they are always relatively difficult to produce and study. Advances in detector capabilities allowed for pioneering measurements of neutron emission spectra of fission fragments [4,5]. In these experiments, resonancelike behavior was observed in the neutron emission spectrum [4,6].These efforts were halted in the following decade by several factors. First, it became increasingly difficult to produce species with larger neutron excess. Second, the very influential work by Hardy, Johnson, and Hansen on "pandemonium" attributed the features of the neutron spectra to purely statistical effects and warned against overinterpretation of the measurements [7]. Misinterpretations of their work attributed decay observables of all heavy nuclei to gross features of the decay strength and statistical fluctuations of the level density. A more accurate depiction of their work is that neutron emission characteristics cannot be interpreted without considering the effects of high level density. The pandemonium controversy [8] arose partly from the fact that, at the time, there was no capability to compute nuclear properties using a sufficiently complete microscopic model of the nucleus.State-of-the-art models are now capable of computing decay properties of atomic nuclei, such as lifetimes and branching ratios. It has become increasingly clear that the β-decay observables are profoundly influenced by nuclearPublished by the American Physical Society under the terms of the Creative Commons Attribution 3.0 Lic...

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“…The effects of deformation on the decay properties of neutronrich isotopes in medium-mass nuclei from Ge up to Pd have been studied in Refs. [29][30][31][34][35][36], demonstrating the need for theoretical formalisms accounting for nuclear deformation.…”

Section: Introductionmentioning

confidence: 99%

β -decay properties of neutron-rich rare-earth isotopes

Sarriguren

2017

Phys. Rev. C

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In this paper, β-decay properties of even-even neutron-rich isotopes in the rare-earth mass region are studied within a microscopic theoretical approach based on a proton-neutron quasiparticle random-phase approximation. The underlying mean field is constructed self-consistently from a deformed Hartree-Fock calculation with Skyrme interactions and pairing correlations to which particle-hole and particle-particle residual interactions are added. Nuclei in this mass region participate in the astrophysical rapid neutron capture process and are directly involved in the generation of the rare-earth peak in the isotopic abundance pattern centered at A 160. The energy distributions of the Gamow-Teller strength as well as the β-decay half-lives and the β-delayed neutron-emission probabilities are discussed and compared with the available experimental information and with calculations based on different approaches.

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β-decay properties of neutron-rich Ge, Se, Kr, Sr, Ru, and Pd isotopes from deformed quasiparticle random-phase approximation

Cited by 49 publications

References 76 publications

Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

Evidence for Gamow-Teller Decay ofNi78Core from Beta-Delayed Neutron Emission Studies

β -decay properties of neutron-rich rare-earth isotopes

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