Identification of the g9/2 proton and neutron band crossing in the N = Z nucleus 76Sr

P. J. Davies; A. V. Afanasjev; R. Wadsworth; C. Andreoiu; R. A. E. Austin; M. P. Carpenter; D. Dashdorj; S. J. Freeman; P. E. Garrett; A. Gorgen; J. Greene; D. G. Jenkins; F. L. Johnston-Theasby; P. Joshi; A. O. Macchiavelli; F. Moore; G. Mukherjee; W. Reviol; D. Sarantites; D. Seweryniak; M. B. Smith; C. E. Svensson; J. J. Valiente-Dobon; D. Ward

doi:10.1103/PhysRevB.75.011302

Identification of the g_9/2 proton and neutron band crossing in the N = Z nucleus ⁷⁶Sr

P. J. Davies, A. V. Afanasjev, R. Wadsworth, C. Andreoiu, R. A. E. Austin, M. P. Carpenter, D. Dashdorj, S. J. Freeman, P. E. Garrett, A. Gorgen, J. Greene, D. G. Jenkins, F. L. Johnston-Theasby, P. Joshi, A. O. Macchiavelli, F. Moore, G. Mukherjee, W. Reviol, D. Sarantites, D. SeweryniakM. B. Smith, C. E. Svensson, J. J. Valiente-Dobon, D. Ward

Research output: Contribution to journal › Article › peer-review

Abstract

High-spin states in Sr-76 have been studied using Gammasphere plus Microball detector arrays. The known yrast band has been extended beyond the first band crossing, which involves the simultaneous alignment of pairs of g(9/2) protons and neutrons, to a tentative spin of 24h. The data are compared with the results of cranked relativistic mean-field (CRMF) and cranked relativistic Hartree-Bogoliubov (CRHB) calculations. The properties of the band, including the g(9/2) proton/neutron band crossing frequency and moments of inertia, are found to be well reproduced by the CRHB calculations. Furthermore, the unpaired CRMF calculations show quite good agreement with the data beyond the band crossing region, indicating that pairing is weak at these frequencies. The high spin results suggest that there is little evidence for an isoscalar (t=0) np pair field. Moreover, a systematic study of the band crossings in even-even N=Z nuclei for the first time reveals that there is no evidence to support the existence of the Coulomb antipairing effect caused by the Coulomb exchange term.

Original language	English
Article number	011302
Pages (from-to)	-
Number of pages	5
Journal	Physical Review C
Volume	75
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.75.011302
Publication status	Published - Jan 2007

Keywords

N=Z
REGION
GAMMASPHERE
MODEL

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10.1103/PhysRevB.75.011302

Cite this

Davies, P. J., Afanasjev, A. V., Wadsworth, R., Andreoiu, C., Austin, R. A. E., Carpenter, M. P., Dashdorj, D., Freeman, S. J., Garrett, P. E., Gorgen, A., Greene, J., Jenkins, D. G., Johnston-Theasby, F. L., Joshi, P., Macchiavelli, A. O., Moore, F., Mukherjee, G., Reviol, W., Sarantites, D., ... Ward, D. (2007). Identification of the g_9/2 proton and neutron band crossing in the N = Z nucleus ⁷⁶Sr. Physical Review C, 75(1), -. Article 011302. https://doi.org/10.1103/PhysRevB.75.011302

@article{52324eb6a4cd499d971621868777eca3,

title = "Identification of the g9/2 proton and neutron band crossing in the N = Z nucleus 76Sr",

abstract = "High-spin states in Sr-76 have been studied using Gammasphere plus Microball detector arrays. The known yrast band has been extended beyond the first band crossing, which involves the simultaneous alignment of pairs of g(9/2) protons and neutrons, to a tentative spin of 24h. The data are compared with the results of cranked relativistic mean-field (CRMF) and cranked relativistic Hartree-Bogoliubov (CRHB) calculations. The properties of the band, including the g(9/2) proton/neutron band crossing frequency and moments of inertia, are found to be well reproduced by the CRHB calculations. Furthermore, the unpaired CRMF calculations show quite good agreement with the data beyond the band crossing region, indicating that pairing is weak at these frequencies. The high spin results suggest that there is little evidence for an isoscalar (t=0) np pair field. Moreover, a systematic study of the band crossings in even-even N=Z nuclei for the first time reveals that there is no evidence to support the existence of the Coulomb antipairing effect caused by the Coulomb exchange term.",

keywords = "N=Z, REGION, GAMMASPHERE, MODEL",

author = "Davies, {P. J.} and Afanasjev, {A. V.} and R. Wadsworth and C. Andreoiu and Austin, {R. A. E.} and Carpenter, {M. P.} and D. Dashdorj and Freeman, {S. J.} and Garrett, {P. E.} and A. Gorgen and J. Greene and Jenkins, {D. G.} and Johnston-Theasby, {F. L.} and P. Joshi and Macchiavelli, {A. O.} and F. Moore and G. Mukherjee and W. Reviol and D. Sarantites and D. Seweryniak and Smith, {M. B.} and Svensson, {C. E.} and Valiente-Dobon, {J. J.} and D. Ward",

year = "2007",

month = jan,

doi = "10.1103/PhysRevB.75.011302",

language = "English",

volume = "75",

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journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Davies, PJ, Afanasjev, AV, Wadsworth, R, Andreoiu, C, Austin, RAE, Carpenter, MP, Dashdorj, D, Freeman, SJ, Garrett, PE, Gorgen, A, Greene, J, Jenkins, DG, Johnston-Theasby, FL, Joshi, P, Macchiavelli, AO, Moore, F, Mukherjee, G, Reviol, W, Sarantites, D, Seweryniak, D, Smith, MB, Svensson, CE, Valiente-Dobon, JJ & Ward, D 2007, 'Identification of the g_9/2 proton and neutron band crossing in the N = Z nucleus ⁷⁶Sr', Physical Review C, vol. 75, no. 1, 011302, pp. -. https://doi.org/10.1103/PhysRevB.75.011302

TY - JOUR

T1 - Identification of the g9/2 proton and neutron band crossing in the N = Z nucleus 76Sr

AU - Davies, P. J.

AU - Afanasjev, A. V.

AU - Wadsworth, R.

AU - Andreoiu, C.

AU - Austin, R. A. E.

AU - Carpenter, M. P.

AU - Dashdorj, D.

AU - Freeman, S. J.

AU - Garrett, P. E.

AU - Gorgen, A.

AU - Greene, J.

AU - Jenkins, D. G.

AU - Johnston-Theasby, F. L.

AU - Joshi, P.

AU - Macchiavelli, A. O.

AU - Moore, F.

AU - Mukherjee, G.

AU - Reviol, W.

AU - Sarantites, D.

AU - Seweryniak, D.

AU - Smith, M. B.

AU - Svensson, C. E.

AU - Valiente-Dobon, J. J.

AU - Ward, D.

PY - 2007/1

Y1 - 2007/1

N2 - High-spin states in Sr-76 have been studied using Gammasphere plus Microball detector arrays. The known yrast band has been extended beyond the first band crossing, which involves the simultaneous alignment of pairs of g(9/2) protons and neutrons, to a tentative spin of 24h. The data are compared with the results of cranked relativistic mean-field (CRMF) and cranked relativistic Hartree-Bogoliubov (CRHB) calculations. The properties of the band, including the g(9/2) proton/neutron band crossing frequency and moments of inertia, are found to be well reproduced by the CRHB calculations. Furthermore, the unpaired CRMF calculations show quite good agreement with the data beyond the band crossing region, indicating that pairing is weak at these frequencies. The high spin results suggest that there is little evidence for an isoscalar (t=0) np pair field. Moreover, a systematic study of the band crossings in even-even N=Z nuclei for the first time reveals that there is no evidence to support the existence of the Coulomb antipairing effect caused by the Coulomb exchange term.

AB - High-spin states in Sr-76 have been studied using Gammasphere plus Microball detector arrays. The known yrast band has been extended beyond the first band crossing, which involves the simultaneous alignment of pairs of g(9/2) protons and neutrons, to a tentative spin of 24h. The data are compared with the results of cranked relativistic mean-field (CRMF) and cranked relativistic Hartree-Bogoliubov (CRHB) calculations. The properties of the band, including the g(9/2) proton/neutron band crossing frequency and moments of inertia, are found to be well reproduced by the CRHB calculations. Furthermore, the unpaired CRMF calculations show quite good agreement with the data beyond the band crossing region, indicating that pairing is weak at these frequencies. The high spin results suggest that there is little evidence for an isoscalar (t=0) np pair field. Moreover, a systematic study of the band crossings in even-even N=Z nuclei for the first time reveals that there is no evidence to support the existence of the Coulomb antipairing effect caused by the Coulomb exchange term.

KW - N=Z

KW - REGION

KW - GAMMASPHERE

KW - MODEL

U2 - 10.1103/PhysRevB.75.011302

DO - 10.1103/PhysRevB.75.011302

M3 - Article

SN - 2469-9985

VL - 75

SP - -

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 011302

ER -