Shell structure from 100Sn to 78Ni: Implications for nuclear astrophysics

Grawe, H.; Blazhev, A.; Górska, M.; Mukha, I.; Plettner, C.; Roeckl, E.; Nowacki, F.; Grzywacz, R.; Sawicka, M.

doi:10.1140/epjad/i2005-06-025-1

Cited by 33 publications

(39 citation statements)

References 36 publications

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“…Spectroscopic information in the very neutron-rich region has been extracted only for the Pd (Z = 46) [13,14] and Cd (Z = 48) isotopes [15][16][17][18]. However, the persistence of the N = 82 magicity is questioned within various theoretical approaches [19,20]. Shell-model calculations including the tensor interaction suggest that a large N = 82 shell gap is preserved [19].…”

Section: Introductionmentioning

confidence: 99%

“…However, the persistence of the N = 82 magicity is questioned within various theoretical approaches [19,20]. Shell-model calculations including the tensor interaction suggest that a large N = 82 shell gap is preserved [19]. In contrast, Hartree-Fock-Bogoliubov (HFB) calculations with the Skyrme force point toward a reduced gap due to a diffused potential caused by the large excess of neutrons [20].…”

Section: Introductionmentioning

confidence: 99%

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Collectivity evolution in the neutron-rich Pd isotopes toward theN=82shell closure

et al. 2013

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The neutron-rich, even-even 122,124,126 Pd isotopes were studied via in-beam γ -ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory. Excited states at 499(9), 590(11), and 686(17) keV were found in the three isotopes, which we assign to the respective 2 + 1 → 0 + gs decays. In addition, candidates for the 4 + 1 states at 1164(20) and 1300(22) keV were observed in 122 Pd and 124 Pd, respectively. The resulting E x (2 + 1 ) systematics are similar to the Xe (Z = 54) isotopic chain and theoretical predictions by the proton-neutron interacting boson model (IBM-2), indicating the magic nature of N = 82 in the Pd isotopes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Collectivity evolution in the neutron-rich Pd isotopes toward theN=82shell closure

et al. 2013

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“…Recent shell model extrapolations of the Z = 28 and N = 50 shell gaps from 68 Ni and 90 Zr, respectively, to 78 Ni yielded persistence of the proton and neutron shell gaps with ∼ 5.1 MeV (see fig. 5) and ∼ 3.5 MeV, respectively [6]. This is in agreement with experimental evidence on the persistence of ν0g 2 9/2 seniority isomerism from N = 42 ( 70 Ni) to N = 48 ( 78 Zn, 76 Ni) [37,38,39,40] and the N = 50 shell strength in Ge isotopes [36].…”

Section: From 48 Ca To 78 Nisupporting

confidence: 90%

“…Sn core, respectively. The interactions for the νg 9/2 orbit below N = 50 is from an empirical fit [7,23] and for the νf 7/2 orbit above N = 82 from extrapolation from the 208 Pb region [6].…”

Section: Valence Mirrors and Break-down Of The Seniority Schemementioning

confidence: 99%

“…-In light nuclei within unique harmonic-oscillator shells starting with an ls-closed N = Z doubly magic nucleus as 16 [5,6,9]. Simultaneously the isotones in the HO oscillator semi-magic nuclei due the shell quenching and particle-hole excitations across the shell develop deformation as observed in -In medium-heavy nuclei starting from a jj-closed doubly magic nucleus as 68 Ni or 100 Sn and going neutronrich along an isotopic (Ni or Sn) chain by adding neutrons the apparent spin-orbit splitting of proton πj = l±1/2 orbits is reduced when filling the νj = l+1+1/2 due to the ∆l = 1 tensor monopole.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear structure far off stability —Implications for nuclear astrophysics

Grawe¹,

Blazhev²,

Górska³

et al.

The 2nd International Conference on Nuclear Physics in Astrophysics

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Abstract. The single-particle structure and shell gap of 100 Sn as inferred from previous in-beam γ-ray spectroscopy has been confirmed in recent studies of seniority and spin-gap isomers by γγ, βγ, βpγ, pγ and 2pγ spectroscopy. The results for 94,95 Ag, 98 Cd and its N = 50 isotones 96 Pd and 94 Ru stress the importance of large-scale shell model calculations employing realistic interactions for the isomerism, np-nh excitations, seniority mixing and E2 polarisation of the 100 Sn core. The strong monopole interaction of the ∆l = 0, 1 spin/isospin-flip partners πg 9/2 -νg 7/2 along the N = 50 isotones and the πf 5/2 -νg 9/2 pair of nucleons along the Z = 28 Ni isotopes are decisive for the evolution of the shell structure towards 100 Sn and 78 Ni. It can be traced back to the tensor force in the effective nucleon-nucleon interaction and provides a straightforward explanation for new shells in neutron-rich light nuclei, implying qualitative predictions for new N = 32, 34 subshells in Ca isotopes, persistence of the 78 Ni proton and neutron shell gaps and non-equivalence of the g 9/2 valence mirror Ni isotopes and N = 50 isotones. This is corroborated by recent experimental data on 56,58 Cr and 70-76 Ni. The implication of monopole driven shell evolution for apparent spin-orbit splitting towards N Z and structure along the astrophysical r-path between N = 50 and N = 82 is discussed.

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Nuclear Data Sheets for A = 97

Nica

2010

Nuclear Data Sheets

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Shell structure from 100Sn to 78Ni: Implications for nuclear astrophysics

Cited by 33 publications

References 36 publications

Collectivity evolution in the neutron-rich Pd isotopes toward theN=82shell closure

Collectivity evolution in the neutron-rich Pd isotopes toward theN=82shell closure

Nuclear structure far off stability —Implications for nuclear astrophysics

Nuclear Data Sheets for A = 97

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