Magnetic dipole bands in 190Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei

A. N. Wilson; J. Timár; I. Ahmad; A. Astier; F. Azaiez; M. H. Bergström; D. J. Blumenthal; B. Crowell; M. P. Carpenter; L. Ducroux; B. J.P. Gall; F. Hannachi; H. Hübel; T. L. Khoo; R. V.F. Janssens; A. Korichi; T. Lauritsen; A. Lopez-Martens; M. Meyer; D. Nisius; E. S. Paul; M. G. Porquet; N. Redon; J. F. Sharpey-Schafer; R. Wadsworth; J. N. Wilson; I. Ragnarsson

doi:10.1016/S0370-2693(01)00332-X

Magnetic dipole bands in ¹⁹⁰Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei

A. N. Wilson^*, J. Timár, I. Ahmad, A. Astier, F. Azaiez, M. H. Bergström, D. J. Blumenthal, B. Crowell, M. P. Carpenter, L. Ducroux, B. J.P. Gall, F. Hannachi, H. Hübel, T. L. Khoo, R. V.F. Janssens, A. Korichi, T. Lauritsen, A. Lopez-Martens, M. Meyer, D. NisiusE. S. Paul, M. G. Porquet, N. Redon, J. F. Sharpey-Schafer, R. Wadsworth, J. N. Wilson, I. Ragnarsson

^*Corresponding author for this work

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

Abstract

An experiment aimed at studying high-spin states in ¹⁹⁰Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h_9/2 orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.

Original language	English
Pages (from-to)	6-14
Number of pages	9
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	505
Issue number	1-4
DOIs	https://doi.org/10.1016/S0370-2693(01)00332-X
Publication status	Published - 26 Apr 2001

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Wilson, A. N., Timár, J., Ahmad, I., Astier, A., Azaiez, F., Bergström, M. H., Blumenthal, D. J., Crowell, B., Carpenter, M. P., Ducroux, L., Gall, B. J. P., Hannachi, F., Hübel, H., Khoo, T. L., Janssens, R. V. F., Korichi, A., Lauritsen, T., Lopez-Martens, A., Meyer, M., ... Ragnarsson, I. (2001). Magnetic dipole bands in ¹⁹⁰Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 505(1-4), 6-14. https://doi.org/10.1016/S0370-2693(01)00332-X

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title = "Magnetic dipole bands in 190Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei",

abstract = "An experiment aimed at studying high-spin states in 190Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h9/2 orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.",

author = "Wilson, {A. N.} and J. Tim{\'a}r and I. Ahmad and A. Astier and F. Azaiez and Bergstr{\"o}m, {M. H.} and Blumenthal, {D. J.} and B. Crowell and Carpenter, {M. P.} and L. Ducroux and Gall, {B. J.P.} and F. Hannachi and H. H{\"u}bel and Khoo, {T. L.} and Janssens, {R. V.F.} and A. Korichi and T. Lauritsen and A. Lopez-Martens and M. Meyer and D. Nisius and Paul, {E. S.} and Porquet, {M. G.} and N. Redon and Sharpey-Schafer, {J. F.} and R. Wadsworth and Wilson, {J. N.} and I. Ragnarsson",

year = "2001",

month = apr,

day = "26",

doi = "10.1016/S0370-2693(01)00332-X",

language = "English",

volume = "505",

pages = "6--14",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-4",

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Wilson, AN, Timár, J, Ahmad, I, Astier, A, Azaiez, F, Bergström, MH, Blumenthal, DJ, Crowell, B, Carpenter, MP, Ducroux, L, Gall, BJP, Hannachi, F, Hübel, H, Khoo, TL, Janssens, RVF, Korichi, A, Lauritsen, T, Lopez-Martens, A, Meyer, M, Nisius, D, Paul, ES, Porquet, MG, Redon, N, Sharpey-Schafer, JF, Wadsworth, R, Wilson, JN & Ragnarsson, I 2001, 'Magnetic dipole bands in ¹⁹⁰Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 505, no. 1-4, pp. 6-14. https://doi.org/10.1016/S0370-2693(01)00332-X

TY - JOUR

T1 - Magnetic dipole bands in 190Hg

T2 - First evidence of excitations across the Z = 82 sub-shell in Hg nuclei

AU - Wilson, A. N.

AU - Timár, J.

AU - Ahmad, I.

AU - Astier, A.

AU - Azaiez, F.

AU - Bergström, M. H.

AU - Blumenthal, D. J.

AU - Crowell, B.

AU - Carpenter, M. P.

AU - Ducroux, L.

AU - Gall, B. J.P.

AU - Hannachi, F.

AU - Hübel, H.

AU - Khoo, T. L.

AU - Janssens, R. V.F.

AU - Korichi, A.

AU - Lauritsen, T.

AU - Lopez-Martens, A.

AU - Meyer, M.

AU - Nisius, D.

AU - Paul, E. S.

AU - Porquet, M. G.

AU - Redon, N.

AU - Sharpey-Schafer, J. F.

AU - Wadsworth, R.

AU - Wilson, J. N.

AU - Ragnarsson, I.

PY - 2001/4/26

Y1 - 2001/4/26

N2 - An experiment aimed at studying high-spin states in 190Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h9/2 orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.

AB - An experiment aimed at studying high-spin states in 190Hg was performed with the Eurogam II array. The data have revealed the presence of cascades of magnetic dipole transitions with some unexpected properties. Unlike the MI bands previously observed in the heavier Hg isotopes, these structures have extremely large B(M1)/B(E2) ratios, The observation of a third dipole band with much lower B(M1)/B(E2) values in the same spin/excitation energy regime suggests that the bands may represent configurations occurring in different minima in the potential energy surface. Configuration-dependent Cranked Nilsson-Strutinsky calculations predict the presence of a minimum in the nuclear potential energy surface at a deformation of ε ≅ 0.2, γ ≅ -90°, occurring when a proton is excited across the Z = 82 shell-gap into an h9/2 orbital. It is suggested that the bands exhibiting anomalously large B(M1)/B(E2) ratios may be associated with this minimum.

UR - http://www.scopus.com/inward/record.url?scp=0035953678&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(01)00332-X

DO - 10.1016/S0370-2693(01)00332-X

M3 - Article

AN - SCOPUS:0035953678

SN - 0370-2693

VL - 505

SP - 6

EP - 14

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-4

ER -

Magnetic dipole bands in 190Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei

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Magnetic dipole bands in ¹⁹⁰Hg: First evidence of excitations across the Z = 82 sub-shell in Hg nuclei