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. Rahkila; S. Rinta-Antila; P. Ruotsalainen; M. Sandzelius; J. Sarén; C. Scholey; J. Sorri; S. Stolze; J. Uusitalo; F. R. Xu; Z. J. Bai

doi:10.1103/PhysRevC.86.044310

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 πh 11/2νg 7/2 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. © 2012 American Physical Society.

Original language	English
Article number	044310
Journal	Physical Review C - Nuclear Physics
Volume	86
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.86.044310
Publication status	Published - 8 Oct 2012

Keywords

Isomer decay
gamma transitions and level energies
Lifetimes
90\&lt
=A\&lt
=149

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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., ... Bai, Z. J. (2012). Identification of isomeric states in the N=73 neutron-deficient nuclei 132Pr and 130La. Physical Review C - Nuclear Physics, 86(4), Article 044310. https://doi.org/10.1103/PhysRevC.86.044310

@article{8210eb1707b04d88bf13bcb811e45a38,

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 πh 11/2νg 7/2 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. {\textcopyright} 2012 American Physical Society.",

keywords = "Isomer decay, gamma transitions and level energies, Lifetimes, 90\&lt, =A\&lt, =149",

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.}",

year = "2012",

month = oct,

day = "8",

doi = "10.1103/PhysRevC.86.044310",

language = "English",

volume = "86",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

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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

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 πh 11/2νg 7/2 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. © 2012 American Physical Society.

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 πh 11/2νg 7/2 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. © 2012 American Physical Society.

KW - Isomer decay

KW - gamma transitions and level energies

KW - Lifetimes

KW - 90\&lt

KW - =A\&lt

KW - =149

U2 - 10.1103/PhysRevC.86.044310

DO - 10.1103/PhysRevC.86.044310

M3 - Article

SN - 0556-2813

VL - 86

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 4

M1 - 044310

ER -

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

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Keywords

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