Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho

Karny, M.; Rykaczewski, K. P.; Grzywacz, R.; Batchelder, J. C.; Bingham, C. R.; Goodin, C.; Gross, C. J.; Hamilton, J. H.; Korgul, A.; Królas, W.; Liddick, S. N.; Li, K.; Maier, K.; Mazzocchi, C.; Piechaczek, A.; Rykaczewski, Konrad; Schapira, D.; Simpson, Delia M.; Tantawy, Mohammed Noor; Winger, J. A.; Yu, C. H.; Zganjar, E. F.; Nikolov, N.; Dobaczewski, J.; Kruppa, A. T.; Nazarewicz, W.; Stoitsov, M. V.

doi:10.1016/j.physletb.2008.04.056

Cited by 48 publications

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“…These spherical HFB calculations with an SkO T functional [4] include the tensor term [5] and were described and used recently in Ref. [6]. For all isotones, the plotted energies of the ν1g 7/2 orbital were lowered by 1.55 MeV as compared to the calculated values, so as to match the experimental value (172 keV) of the relative ν2d 5/2 -ν1g 7/2 energy difference, recently established for the N = 51 isotone 101 Sn [30] with just one neutron above the doubly magic 100 Sn core.…”

Section: Theoretical Interpretationmentioning

confidence: 99%

“…However, any effects related to the evolution of singleparticle levels following an N or Z dependence of the nuclear interaction have to be established before we can assign the observed structural changes to weak nuclear binding. In this article we present the experimental evidence and spherical HFB calculations using an SkO functional [4] involving the tensor term in the nucleon-nucleon interaction [5,6] which both point to an emerging new subshell gap in neutron-rich nuclei beyond 78 Ni, at the neutron number N = 58. The related weakening of the 78 Ni doubly magic core is also discussed * j.a.winger@msstate.edu based on our experimental data on the 0 + -2 + -4 + ground-state band energies in N = 52 84 Ge.…”

Section: Introductionmentioning

confidence: 97%

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New subshell closure atN=58emerging in neutron-rich nuclei beyondNi78

et al. 2010

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The structure of neutron-rich nuclei beyond 78 Ni was studied using postaccelerated radioactive beams of 83,84,85 Ga utilizing β γ and β-n γ spectroscopy. Our data, when combined with energy level systematics, suggests a possible new spherical subshell closure at N = 58 is created by the nearly degenerated ν3s 1/2 and ν2d 5/2 orbitals being well separated from other orbitals above N = 50. The near degeneracy of these states could be evidenced by isomerism in this region. The energies of the 2 + 1 and proposed 4 + 1 states observed in N = 52 84 Ge are interpreted as an indication of a possible weakening of the doubly magic 78 Ni core for nuclei beyond N = 50. The experimental evidence is supported by spherical HFB calculations using the SkO T functional involving the tensor term in the nucleon-nucleon interaction.

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Section: Theoretical Interpretationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

New subshell closure atN=58emerging in neutron-rich nuclei beyondNi78

et al. 2010

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“…The proton radioactivity can be used as an useful tool to extract nuclear structure information such as the shell structure and the coupling between bound and unbound nuclear states [2]. Measurement on the proton energy, half-life and proton branching ratio (fine structure) helps to determine the angular momentum l carried away by the emitted proton and to characterize its wave function inside the nucleus [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

Proton radioactivity within a generalized liquid drop model

2009

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The proton radioactivity half-lives of spherical proton emitters are investigated theoretically. The potential barriers preventing the emission of proton are determined in the quasimolecular shape path within a generalized liquid drop model (GLDM) including the proximity effects between nuclei in a neck and the mass and charge asymmetry. The penetrability is calculated in the WKB approximation. The spectroscopic factor has been taken into account in half-life calculation, which is obtained by employing the relativistic mean field (RMF) theory combined with the BCS method with the force NL3. The half-lives within the GLDM are compared with the experimental data and other theoretical values. GLDM works quite well for spherical proton emitters when the spectroscopic factors are considered, indicating the necessity of introducing the spectroscopic factor and the success of the GLDM for proton emission. Finally, we present two formulae for proton emission half-life similar to the Viola-Seaborg formulae and Royer's formulae of α-decay.

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“…The average energy of recoil ions after the degraders was 74 MeV. The detection setup also included a series of veto detectors, that suppressed particles escaping the DSSD detector with good efficiency [15]: upstream a box consisting of 4 silicon detectors (Si-box) surrounded the DSSD, while a 5 mm-thick Si(Li) detector was placed just behind it in close geometry.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the decays of112Cs and111Xe

et al. 2012

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An experiment to search for the alpha decay of 112 Cs has been performed at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. The alpha decay of 112 Cs was not observed, thus setting the upper limit of the alpha branching ratio at 0.26%. The half-life of 112 Cs was measured as 506 ± 55 µs. In the same measurement the decay properties of its proton decay daughter 111 Xe were also reinvestigated. The newly measured alpha branching ratio for 111 Xe is 10.4 ± 1.9 %. The experimental proton separation energies Sp for odd-Z nuclei above 100 Sn were compared to shell model calculations. The calculated proton separation energies for 103 Sb and 102 Sb point to half-lives of the order of 10 ps and 1 ns, respectively.

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Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho

Cited by 48 publications

References 47 publications

New subshell closure atN=58emerging in neutron-rich nuclei beyondNi78

New subshell closure atN=58emerging in neutron-rich nuclei beyondNi78

Proton radioactivity within a generalized liquid drop model

Experimental study of the decays of112Cs and111Xe

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