Discovery of a 10 μs isomeric state in 63139Eu

D. M. Cullen; P. J R Mason; C. Scholey; S. Eeckhaudt; T. Grahn; P. T. Greenlees; U. Jakobsson; P. M. Jones; R. Julin; S. Juutinen; S. Ketelhut; A. M. Kishada; M. Leino; A. P. Leppänen; K. Mäntyniemi; P. Nieminen; M. Nyman; J. Pakarinen; P. Peura; M. G. Procter; P. Rahkila; S. V. Rigby; J. Sarén; J. Sorri; J. Uusitalo; B. J. Varley; M. Venhart

doi:10.1103/PhysRevC.83.014316

Discovery of a 10 μs isomeric state in 63139Eu

D. M. Cullen, P. J R Mason, C. Scholey, S. Eeckhaudt, T. Grahn, P. T. Greenlees, U. Jakobsson, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, A. M. Kishada, M. Leino, A. P. Leppänen, K. Mäntyniemi, P. Nieminen, M. Nyman, J. Pakarinen, P. Peura, M. G. ProcterP. Rahkila, S. V. Rigby, J. Sarén, J. Sorri, J. Uusitalo, B. J. Varley, M. Venhart

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Abstract

Recoil-isomer tagging with the Fe54+Mo92 reaction was used to establish a 10(2)-μs isomeric state in Eu139. Prompt versus delayed γ-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g7/2 configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The γ-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in Eu139 is reasoned to be because of difference in shape of the proton g7/2 state and the proton h11/2 ground state to which it decays. © 2011 The American Physical Society.

Original language	English
Article number	014316
Journal	Physical Review C - Nuclear Physics
Volume	83
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.83.014316
Publication status	Published - 28 Jan 2011

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Cullen, D. M., Mason, P. J. R., Scholey, C., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kishada, A. M., Leino, M., Leppänen, A. P., Mäntyniemi, K., Nieminen, P., Nyman, M., Pakarinen, J., Peura, P., ... Venhart, M. (2011). Discovery of a 10 μs isomeric state in 63139Eu. Physical Review C - Nuclear Physics, 83(1), Article 014316. https://doi.org/10.1103/PhysRevC.83.014316

@article{d3981b72ed6f4ceda0ef813fa459fcbc,

title = "Discovery of a 10 μs isomeric state in 63139Eu",

abstract = "Recoil-isomer tagging with the Fe54+Mo92 reaction was used to establish a 10(2)-μs isomeric state in Eu139. Prompt versus delayed γ-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g7/2 configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The γ-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in Eu139 is reasoned to be because of difference in shape of the proton g7/2 state and the proton h11/2 ground state to which it decays. {\textcopyright} 2011 The American Physical Society.",

author = "Cullen, {D. M.} and Mason, {P. J R} and C. Scholey and S. Eeckhaudt and T. Grahn and Greenlees, {P. T.} and U. Jakobsson and Jones, {P. M.} and R. Julin and S. Juutinen and S. Ketelhut and Kishada, {A. M.} and M. Leino and Lepp{\"a}nen, {A. P.} and K. M{\"a}ntyniemi and P. Nieminen and M. Nyman and J. Pakarinen and P. Peura and Procter, {M. G.} and P. Rahkila and Rigby, {S. V.} and J. Sar{\'e}n and J. Sorri and J. Uusitalo and Varley, {B. J.} and M. Venhart",

year = "2011",

month = jan,

day = "28",

doi = "10.1103/PhysRevC.83.014316",

language = "English",

volume = "83",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

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Cullen, DM, Mason, PJR, Scholey, C, Eeckhaudt, S, Grahn, T, Greenlees, PT, Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Kishada, AM, Leino, M, Leppänen, AP, Mäntyniemi, K, Nieminen, P, Nyman, M, Pakarinen, J, Peura, P, Procter, MG, Rahkila, P, Rigby, SV, Sarén, J, Sorri, J, Uusitalo, J, Varley, BJ & Venhart, M 2011, 'Discovery of a 10 μs isomeric state in 63139Eu', Physical Review C - Nuclear Physics, vol. 83, no. 1, 014316. https://doi.org/10.1103/PhysRevC.83.014316

TY - JOUR

T1 - Discovery of a 10 μs isomeric state in 63139Eu

AU - Cullen, D. M.

AU - Mason, P. J R

AU - Scholey, C.

AU - Eeckhaudt, S.

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Jakobsson, U.

AU - Jones, P. M.

AU - Julin, R.

AU - Juutinen, S.

AU - Ketelhut, S.

AU - Kishada, A. M.

AU - Leino, M.

AU - Leppänen, A. P.

AU - Mäntyniemi, K.

AU - Nieminen, P.

AU - Nyman, M.

AU - Pakarinen, J.

AU - Peura, P.

AU - Procter, M. G.

AU - Rahkila, P.

AU - Rigby, S. V.

AU - Sarén, J.

AU - Sorri, J.

AU - Uusitalo, J.

AU - Varley, B. J.

AU - Venhart, M.

PY - 2011/1/28

Y1 - 2011/1/28

N2 - Recoil-isomer tagging with the Fe54+Mo92 reaction was used to establish a 10(2)-μs isomeric state in Eu139. Prompt versus delayed γ-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g7/2 configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The γ-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in Eu139 is reasoned to be because of difference in shape of the proton g7/2 state and the proton h11/2 ground state to which it decays. © 2011 The American Physical Society.

AB - Recoil-isomer tagging with the Fe54+Mo92 reaction was used to establish a 10(2)-μs isomeric state in Eu139. Prompt versus delayed γ-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g7/2 configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The γ-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in Eu139 is reasoned to be because of difference in shape of the proton g7/2 state and the proton h11/2 ground state to which it decays. © 2011 The American Physical Society.

U2 - 10.1103/PhysRevC.83.014316

DO - 10.1103/PhysRevC.83.014316

M3 - Article

SN - 0556-2813

VL - 83

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 1

M1 - 014316

ER -

Discovery of a 10 μs isomeric state in 63139Eu

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