Coexistence in odd-mass nuclei

Heyde, K.; Isacker, P. Van; Waroquier, Michel; Wood, John L.; Meyer, R.A.

doi:10.1016/0370-1573(83)90085-6

Cited by 501 publications

(160 citation statements)

References 84 publications

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“…This is similar to the case of 11/2 − states [42], where the experimental data were well explained in the context of shape-coexistence/shape-evolution employing a WoodsSaxon mean-field with the odd valence proton diabatically blocked when changing the β 2 deformation parameter. In addition, similarities of excitation energy curves between 11/2 − states in Sb isotopes and that of 3 − octupole collective states in neighboring Sn isotopes indicate considerable mixing, in Sb isotopes, between quasiparticle 11/2 − states and 3 − ⊗ 2d 5/2 particle-couplevibrational states [3].…”

Section: A Influence Of Deformation Effectsupporting

confidence: 79%

Shell evolution aboveZ,N=50within Skyrme density functional theory: The impact of deformation and tensor interactions

Shi

2017

Phys. Rev. C

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Background Recent years have seen considerable effort in associating the shell evolution (SE) for a chain of isotones or isotopes with the underlying nuclear interactions. In particular, it has been fairly well established that the tensor part of the Skyrme interaction is indispensable for understanding certain SE above Z, N =50 shell closures, as a function of nucleon numbers.Purpose The purpose of the present work is twofold: (1) to study the effect of deformation due to blocking, on the SE above Z, N = 50 shell closures; (2) to examine the optimal parameterizations in the tensor part which gives a proper description of the SE above Z, N =50 shell closures.Methods I use Skyrme-Hartree-Fock-Bogoliubov (SHFB) method to compute the even-even vacua of the Z = 50 isotopes and N = 50 isotones. For Sb and odd-A Sn isotopes, I perform calculations with a blocking procedure which accounts for the polarization effects, including deformations.Results The blocking SHFB calculations show that the light odd-A Sb isotopes, with only one valence proton occupying down-sloping Ω = 11/2 − and Ω = 7/2 + Nilsson orbits, assume finite oblate deformations. This reduces the energy differences between 11/2 − and 7/2 + states by about 500 keV for 51Sb56−66, bringing the energy-difference curve closer to the experimental one. With UNE2T1 energy density functional (EDF), which differs from unedf2 parameterization by tensor terms, a better description of the slope of ∆e(π1h 11/2 − π1g 7/2 ) as a function of neutron number has been obtained. However, the trend of ∆e(π1g 7/2 − π2d 5/2 ) curve is worse using UNE2T1 EDF. ∆e(ν3s 1/2 − ν2d 5/2 ), and ∆e(ν1g 7/2 − ν2d 5/2 ) curve for N =50 isotones using UNE2T1 seems to be consistent with experimental data. The neutron SE of ∆e(ν1h 11/2 − ν1g 7/2 ), and ∆e(ν1g 7/2 − ν2d 5/2 ) for Sn isotopes are shown to be sensive to αT tensor parameter.Conclusions Within the Skyrme self-consistent mean-field model, the deformation degree of freedom has to be taken into account for Sb isotopes, N =51 isotones, and odd-A Sn isotopes when discussing variation of quantities like shell gap etc. The tensor terms are important for describing the strong variation of ∆E(Ω π = 11/2 − − 7/2 + ) in Sb isotopes. The SE of 1/2 + , and 7/2 + states in N =51 isotones may show signature for the existence of tensor interaction. The experimental excitation energies of 11/2 − , and 7/2 + states in odd-A Sn isotopes close to 132 Sn give prospects for constraining the αT parameter.

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Section: A Influence Of Deformation Effectsupporting

confidence: 79%

Shell evolution aboveZ,N=50within Skyrme density functional theory: The impact of deformation and tensor interactions

Shi

2017

Phys. Rev. C

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“…Even-even mercury isotopes have been found to be a prolific testing ground for the phenomenon of shape coexistence [1][2][3], whereby different types of deformation coexist at low excitation energy within the same nucleus. Shape coexistence in the neutron-deficient mercury nuclei has been observed by using different techniques, ranging from optical [4] and laser spectroscopy [5,6] to in-beam spectroscopy [7,8] and decay spectroscopy [9,10].…”

Section: Introductionmentioning

confidence: 99%

Shape coexistence in180Hg studied through theβdecay of180Tl

Elseviers¹,

Andreyev²,

Antalic³

et al. 2011

Phys. Rev. C

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The β + /EC decay of 180 Tl and excited states in the daughter nucleus 180 Hg have been investigated at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. Many new low-lying energy levels were observed in 180 Hg, of which the most significant are the 0 + 2 at 419.6 keV and the 2 + 2 at 601.3 keV. The former is the bandhead of an excited band in 180 Hg assumed originally to be of prolate nature. From the β feeding to the different states in 180 Hg, the ground-state spin of 180 Tl was deduced to be (4 − ,5 − ).

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“…Here, the three lowest energy states having spin/parity 0 + correspond to spherical, oblate and prolate shapes, all within an energy spanning only 650 keV. These phenomena are described by particle-hole excitations of proton pairs across the closed shell [10,11]. The interaction of additional proton-hole pairs and valence neutrons will lead to a minimum in energy around mid-shell.…”

Section: Introductionmentioning

confidence: 99%

Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb

et al. 2008

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Accurate atomic mass measurements of neutron-deficient and neutron-rich nuclides around the doubly-magic 208 Pb and of neutron-rich cesium isotopes were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. Pb,[190][191][192][193][194][195][196][197] 209,215,216 Bi, 203,205,229 Fr, and 214,229,230 Ra were determined. The obtained relative mass uncertainty in the range of 2 · 10 −7 to 2 · 10 −8 is not only required for safe identification of isomeric states but also allows mapping the detailed structure of the mass surface. A mass adjustment procedure was carried out and the results included into the Atomic Mass Evaluation. The resulting separation energies are discussed and the mass spectrometric and laser spectroscopic data are examined for possible correlations.

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Coexistence in odd-mass nuclei

Cited by 501 publications

References 84 publications

Shell evolution aboveZ,N=50within Skyrme density functional theory: The impact of deformation and tensor interactions

Shell evolution aboveZ,N=50within Skyrme density functional theory: The impact of deformation and tensor interactions

Shape coexistence in180Hg studied through theβdecay of180Tl

Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb

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