Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La

M. J. Taylor, G. A. Alharshan, D. M. Cullen, M. G. Procter, N. M. Lumley, T. Grahn, P. T. Greenlees, K. Hauschild, A. Herzan, U. Jakobsson, P. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, A. Lopez-Martens, P. Nieminen, J. Partanen, P. Peura, P. RahkilaS. Rinta-Antila, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, J. Uusitalo, F. R. Xu, Z. J. Bai

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Abstract

Decays from isomeric states in the neutron-deficient N=73 nuclei 132Pr and 130La have been observed for the first time. Half-lives of 486(70) ns and 2.46(4) μs were measured for two isomeric states in 132Pr. The decay from the 486ns (8-) isomer has been interpreted as a hindered E1 transition from the bandhead state of the excited πh11/2νg7/2 configuration. The decay from the 2.5 μs (8+) isomer is consistent with the Weisskopf estimate for a low-energy E2 transition. An analogous 0.74(3) μs decay from an (8+) isomer in the neighboring isotone 130La has also been observed which similarly can be explained if the transition has E2 character. The Weisskopf interpretation for the isomer hindrance is strengthened by the lack of evidence for shape or K isomerism due to the γ-soft shapes predicted by configuration-constrained potential-energy- surface calculations.

Original languageEnglish
Article number044310
JournalPhysical Review C - Nuclear Physics
Volume86
Issue number4
DOIs
Publication statusPublished - 8 Oct 2012

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isomers
neutrons
nuclei
decay
configurations
half life
potential energy
estimates
energy

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Taylor, M. J. ; Alharshan, G. A. ; Cullen, D. M. ; Procter, M. G. ; Lumley, N. M. ; Grahn, T. ; Greenlees, P. T. ; Hauschild, K. ; Herzan, A. ; Jakobsson, U. ; Jones, P. ; Julin, R. ; Juutinen, S. ; Ketelhut, S. ; Leino, M. ; Lopez-Martens, A. ; Nieminen, P. ; Partanen, J. ; Peura, P. ; Rahkila, P. ; Rinta-Antila, S. ; Ruotsalainen, P. ; Sandzelius, M. ; Sarén, J. ; Scholey, C. ; Sorri, J. ; Stolze, S. ; Uusitalo, J. ; Xu, F. R. ; Bai, Z. J. / Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La. In: Physical Review C - Nuclear Physics. 2012 ; Vol. 86, No. 4.
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title = "Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La",
abstract = "Decays from isomeric states in the neutron-deficient N=73 nuclei 132Pr and 130La have been observed for the first time. Half-lives of 486(70) ns and 2.46(4) μs were measured for two isomeric states in 132Pr. The decay from the 486ns (8-) isomer has been interpreted as a hindered E1 transition from the bandhead state of the excited πh11/2νg7/2 configuration. The decay from the 2.5 μs (8+) isomer is consistent with the Weisskopf estimate for a low-energy E2 transition. An analogous 0.74(3) μs decay from an (8+) isomer in the neighboring isotone 130La has also been observed which similarly can be explained if the transition has E2 character. The Weisskopf interpretation for the isomer hindrance is strengthened by the lack of evidence for shape or K isomerism due to the γ-soft shapes predicted by configuration-constrained potential-energy- surface calculations.",
author = "Taylor, {M. J.} and Alharshan, {G. A.} and Cullen, {D. M.} and Procter, {M. G.} and Lumley, {N. M.} and T. Grahn and Greenlees, {P. T.} and K. Hauschild and A. Herzan and U. Jakobsson and P. Jones and R. Julin and S. Juutinen and S. Ketelhut and M. Leino and A. Lopez-Martens and P. Nieminen and J. Partanen and P. Peura and P. Rahkila and S. Rinta-Antila and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and C. Scholey and J. Sorri and S. Stolze and J. Uusitalo and Xu, {F. R.} and Bai, {Z. J.}",
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Taylor, MJ, Alharshan, GA, Cullen, DM, Procter, MG, Lumley, NM, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Jakobsson, U, Jones, P, Julin, R, Juutinen, S, Ketelhut, S, Leino, M, Lopez-Martens, A, Nieminen, P, Partanen, J, Peura, P, Rahkila, P, Rinta-Antila, S, Ruotsalainen, P, Sandzelius, M, Sarén, J, Scholey, C, Sorri, J, Stolze, S, Uusitalo, J, Xu, FR & Bai, ZJ 2012, 'Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La', Physical Review C - Nuclear Physics, vol. 86, no. 4, 044310. https://doi.org/10.1103/PhysRevC.86.044310

Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La. / Taylor, M. J.; Alharshan, G. A.; Cullen, D. M.; Procter, M. G.; Lumley, N. M.; Grahn, T.; Greenlees, P. T.; Hauschild, K.; Herzan, A.; Jakobsson, U.; Jones, P.; Julin, R.; Juutinen, S.; Ketelhut, S.; Leino, M.; Lopez-Martens, A.; Nieminen, P.; Partanen, J.; Peura, P.; Rahkila, P.; Rinta-Antila, S.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Scholey, C.; Sorri, J.; Stolze, S.; Uusitalo, J.; Xu, F. R.; Bai, Z. J.

In: Physical Review C - Nuclear Physics, Vol. 86, No. 4, 044310, 08.10.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La

AU - Taylor, M. J.

AU - Alharshan, G. A.

AU - Cullen, D. M.

AU - Procter, M. G.

AU - Lumley, N. M.

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Hauschild, K.

AU - Herzan, A.

AU - Jakobsson, U.

AU - Jones, P.

AU - Julin, R.

AU - Juutinen, S.

AU - Ketelhut, S.

AU - Leino, M.

AU - Lopez-Martens, A.

AU - Nieminen, P.

AU - Partanen, J.

AU - Peura, P.

AU - Rahkila, P.

AU - Rinta-Antila, S.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Uusitalo, J.

AU - Xu, F. R.

AU - Bai, Z. J.

PY - 2012/10/8

Y1 - 2012/10/8

N2 - Decays from isomeric states in the neutron-deficient N=73 nuclei 132Pr and 130La have been observed for the first time. Half-lives of 486(70) ns and 2.46(4) μs were measured for two isomeric states in 132Pr. The decay from the 486ns (8-) isomer has been interpreted as a hindered E1 transition from the bandhead state of the excited πh11/2νg7/2 configuration. The decay from the 2.5 μs (8+) isomer is consistent with the Weisskopf estimate for a low-energy E2 transition. An analogous 0.74(3) μs decay from an (8+) isomer in the neighboring isotone 130La has also been observed which similarly can be explained if the transition has E2 character. The Weisskopf interpretation for the isomer hindrance is strengthened by the lack of evidence for shape or K isomerism due to the γ-soft shapes predicted by configuration-constrained potential-energy- surface calculations.

AB - Decays from isomeric states in the neutron-deficient N=73 nuclei 132Pr and 130La have been observed for the first time. Half-lives of 486(70) ns and 2.46(4) μs were measured for two isomeric states in 132Pr. The decay from the 486ns (8-) isomer has been interpreted as a hindered E1 transition from the bandhead state of the excited πh11/2νg7/2 configuration. The decay from the 2.5 μs (8+) isomer is consistent with the Weisskopf estimate for a low-energy E2 transition. An analogous 0.74(3) μs decay from an (8+) isomer in the neighboring isotone 130La has also been observed which similarly can be explained if the transition has E2 character. The Weisskopf interpretation for the isomer hindrance is strengthened by the lack of evidence for shape or K isomerism due to the γ-soft shapes predicted by configuration-constrained potential-energy- surface calculations.

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U2 - 10.1103/PhysRevC.86.044310

DO - 10.1103/PhysRevC.86.044310

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JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

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M1 - 044310

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