Nuclear Data Sheets for A = 251–259 (odd)

Browne, E.; Tuli, J.K.

doi:10.1016/j.nds.2013.08.002

Cited by 44 publications

(12 citation statements)

References 285 publications

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“…As can be seen from panel (a) the K 0 = 9/2 energy, computed as the HFB-EFA plus the rotational energy, displays as a function of the quadrupole moment, a behavior reminiscent of the one found for 252 No. The absolute minimum of the K 0 = 9/2 path appears at Q 20 = 16 b and corresponds to a parity-conserving configuration [see, panel (b)] with π = -1, which agrees well with the experimental [57] K π = 9/2 − ground state for this nucleus. The 9/2 − fission iso-mer at Q 20 = 52 b lies 2.22 MeV above the ground state from which, it is separated by the inner barrier (Q 20 = 30 b) with the height of 11.67 MeV.…”

Section: B the Nucleus 253 Nosupporting

confidence: 75%

Microscopic description of fission in nobelium isotopes with the Gogny-D1M energy density functional

Rodrı́guez-Guzmán

Robledo

2016

Eur. Phys. J. A

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Constrained mean-field calculations, based on the Gogny-D1M energy density functional, have been carried out to describe fission in the isotopes 250−260 No. The even-even isotopes have been considered within the standard Hartree-Fock-Bogoliobov (HFB) framework while for the odd-mass ones the Equal Filling Approximation (HFB-EFA) has been employed. Ground state quantum numbers and deformations, pairing energies, one-neutron separation energies, inner and outer barrier heights as well as fission isomer excitation energies are given. Fission paths, collective masses and zero-point quantum vibrational and rotational corrections are used to compute the systematic of the spontaneous fission half-lives tSF both for even-even and odd-mass nuclei. Though there exists a strong variance of the predicted fission rates with respect to the details involved in their computation, it is shown that both the specialization energy and the pairing quenching effects, taken into account within the self-consistent HFB-EFA blocking procedure, lead to larger tSF values in odd-mass nuclei as compared with their even-even neighbors. Alpha decay lifetimes have also been computed using a parametrization of the Viola-Seaborg formula. The high quality of the Gogny-D1M functional regarding nuclear masses leads to a very good reproduction of Qα values and consequently of lifetimes.

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Section: B the Nucleus 253 Nosupporting

confidence: 75%

Microscopic description of fission in nobelium isotopes with the Gogny-D1M energy density functional

Rodrı́guez-Guzmán

Robledo

2016

Eur. Phys. J. A

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“…The decays from 161 open-shell odd-A and odd (Z)-odd(N) radioactive  emitters in the mass region of are mentioned. In Table I [29][30][31][32][33][34][35][36], column 7, are taken into account in deducing the preformation probability. The first five columns of Table I identify, respectively, the parent and daughter nuclei, and the ground-state spin and parity of them ( ( ) ) in addition to the considered value of minimum angular momentum carried out by the emitted  particle ( ).…”

Section: Resultsmentioning

confidence: 99%

“…he estimated  preformation probability, (Eq. (13)), in the mentioned parent nuclei based on the experimental partial half-lives ( (s)) [29][30][31][32][33][34][35][36]. The uncertainties in the experimental half-life time and the intensity are both considered in the listed partial half-lives.…”

Section: Discussionmentioning

confidence: 99%

Preformation probability inside α emitters having different ground state spin-parity than their daughters

2015

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ABSTRACT:The ground-state spin and parity of a formed daughter in the radioactive -emitter is expected to influence the preformation probability of the  and daughter clusters inside it. We investigate the  and daughter preformation probability inside odd-A and doubly-odd radioactive nuclei when the daughter and parent are of different spin and/or parity. We consider only the ground-state to ground-state unfavored decays. This is to extract precise information about the effect of the difference in the ground states spin-parity of the involved nuclei far away any influences from the excitation energy if the decays are coming from isomeric states. The calculations are done for 161 -emitters, with and , in the framework of the extended cluster model, with WKB penetrability and assault frequency. We used a Hamiltonian energy density scheme based on Skyrme-SLy4 interaction to compute the interaction potential. The  plus cluster preformation probability is extracted from the calculated decay width and the experimental half-life time. We discussed in detailed steps the effect of angular momentum of the emitted -particle on the various physical quantities involved in the unfavored decay process and how it is finally increases the half-life time. We found that if the ground states spin and/or parity of parent and daughter nuclei are different, then the preformation probability of the -cluster inside parent is less than it would be if they have similar spin-parity. We modified the formula that gives the preformation probability in terms of the numbers of protons and neutrons outside the shell closures of parent, to account for this hindrance in the preformation probability for the unfavored decays between ground states.2

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“…. The spins proposed in the evaluation[53] should be excluded since the lowest unobserved transitions, because they were highly converted, were ignored in the evaluated level scheme.…”

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confidence: 99%