Single-particle and collective structures in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Cr</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>55</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">V</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>55</mml:mn></mml:mrow></mml:mmultiscripts></mml:

Deacon, A. N.; Steppenbeck, D.; Zhu, S.; Freeman, S. J.; Janssens, R. V. F.; Carpenter, M. P.; Fornal, B.; Honma, Michio; Kay, B. P.; Kondev, F. G.; Kozemczak, J.; Larabee, A. J.; Lauritsen, T.; Lister, C. J.; Robinson, Andrew; Seweryniak, D.; Smith, J. F.; Sun, Y.; Wang, X.; Fang, Xu; Yang, Ying-Chun

doi:10.1103/physrevc.83.064305

Cited by 11 publications

(3 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most recently, it has been reported that the breakdown of the N = 40 magicity can possibly be extended even to Ti isotopes [23] having less proton-neutron quadrupole collectivity than the Cr and * togashi@cns.s.u-tokyo.ac.jp Fe isotopes. This abrupt nuclear-structure change from Ni to lower-Z isotopes is analogous to what is observed in the so-called "island of inversion" region around 32 Mg [24] where neutron excitation induces a large deformation. The evolution of the N = 40 shell gap contributes greatly to the formation of the island of inversion in Cr and Fe isotopes.…”

Section: Introductionsupporting

confidence: 58%

“…Another significant nuclear-structure issue in the unnatural-parity states in Cr and Fe isotopes is their nuclear shapes; in particular, how these shapes are polarized by an additional neutron in the 0g 9/2 orbit. The development of deformation is indicated experimentally from the regular spacing between ∆I = 2 energy levels observed up to high-spin states [27,28,[30][31][32]. While various models show the dominance of prolate deformation in the ground states of Cr isotopes (see [33] for instance), an oblate deformation in the unnatural-parity band of 59 Cr has been suggested in [29] from the observed isomeric 9/2 + state located at 503 keV, which should be the lowest among unnatural-parity states.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

et al. 2015

View full text Add to dashboard Cite

We investigate unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes using large-scale shell-model calculations. These shell-model calculations are carried out within the model space of fp-shell + 0g 9/2 + 1d 5/2 orbits with the truncation allowing 1 ω excitation of a neutron. The effective Hamiltonian consists of GXPF1Br for fp-shell orbits and V MU with a modification for the other parts. The present shell-model calculations can describe and predict the energy levels of both natural-and unnatural-parity states up to the high-spin states in Cr and Fe isotopes with N 35. The total energy surfaces present prolate deformations on the whole and indicate that the excitation of one neutron into the 0g 9/2 orbit plays the role of enhancing prolate deformation. For positive (unnatural)-parity states in odd-mass Cr and Fe isotopes, their energy levels and prolate deformations indicate the decoupling limit of the particle-plus-rotor model. The sharp drop of the 9/2 + 1 levels in going from N = 29 to N = 35 in odd-mass Cr, Fe, and Ni isotopes is explained by the Fermi surface approaching the ν0g 9/2 orbit.

show abstract

Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

et al. 2015

View full text Add to dashboard Cite

show abstract

“…These observations, combined with the large B(E2, 2 + 1 → 0 + ) value measured for 70 Ni 42 [20], lead to the conclusion that any "island" of nuclei with indications of a significant N = 40 gap is rather localized. A main contributor to this situation is the monopole tensor force [21,22] between protons in the pf shell and g 9/2 neutrons, where the occupation of the latter orbital leads to the onset of deformation, as evidenced, for example, by the presence of rotational bands in neutron-rich 55−57 Cr and 59−61 Fe nuclei [23][24][25][26][27]. On the other hand, couplings of protons and/or neutrons to the 68 Ni core do not always result in a large polarization of the core.…”

Section: Introductionmentioning

confidence: 99%

Nature of yrast excitations nearN=40: Level structure of67Ni

et al. 2012

Self Cite

View full text Add to dashboard Cite

Excited states in67 Ni were populated in deep-inelastic reactions of a 64 Ni beam at 430 MeV on a thick 238 U target. A level scheme built on the previously known 13-µs isomer has been delineated up to an excitation energy of 5.3 MeV and a tentative spin and parity of (21/2 − ). Shell model calculations have been carried out using two effective interactions in the f 5/2 pg 9/2 model space with a 56 Ni core. Satisfactory agreement between experiment and theory is achieved for the measured transition energies and branching ratios. The calculations indicate that the yrast states are associated with rather complex configurations, herewith demonstrating the relative weakness of the N = 40 subshell gap and the importance of multi particle-hole excitations involving the g 9/2 neutron orbital.

show abstract

Excited Nuclear States for V-55 (Vanadium)

Sukhoruchkin¹,

Soroko²

2015

Supplement to I/25 a-E

View full text Add to dashboard Cite

Single-particle and collective structures inCr55andV55

Cited by 11 publications

References 53 publications

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

Large-scale shell-model calculations for unnatural-parity high-spin states in neutron-rich Cr and Fe isotopes

Nature of yrast excitations nearN=40: Level structure of67Ni

Excited Nuclear States for V-55 (Vanadium)

Contact Info

Product

Resources

About