Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75

S. V. Rigby; D. M. Cullen; P. J.R. Mason; D. T. Scholes; C. Scholey; P. Rahkila; S. Eeckhaudt; T. Grahn; P. Greenlees; P. M. Jones; R. Julin; S. Juutinen; H. Kettunen; M. Leino; A. P. Leppänen; P. Nieminen; M. Nyman; J. Pakarinen; J. Uusitalo

doi:10.1103/PhysRevC.78.034304

Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75

S. V. Rigby, D. M. Cullen, P. J.R. Mason, D. T. Scholes, C. Scholey, P. Rahkila, S. Eeckhaudt, T. Grahn, P. Greenlees, P. M. Jones, R. Julin, S. Juutinen, H. Kettunen, M. Leino, A. P. Leppänen, P. Nieminen, M. Nyman, J. Pakarinen, J. Uusitalo

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Abstract

An experiment has been performed to populate several extremely neutron-deficient nuclei around the mass-140 region of the nuclear chart, using a beam of Fe54 on a Mo92 target at an energy of 315 MeV. Analysis of these data using recoil-isomer tagging has established that the yrast πh11/2?νh11/2, Jπ=(8+), bandhead state in Pm136 is isomeric with a half-life of 1.5(1) μs. This isomeric state decays via a 43-keV, probable-E1 transition to a Jπ=(7-) state. Consideration of the theoretical Nilsson orbitals near the Fermi surface suggests that the Jπ=(8+) state has a νh11/2[505]112-? πh11/2[532]52- configuration, which decays to the Jπ=(7-) state with a νh11/2[505]112-?πd5/2[411]32+ configuration. Differences in the shape-driving effects for these two configurations is reasoned to be responsible for the long half-life of the Jπ=(8+) isomeric state. The non-observation of other γ rays in prompt or delayed coincidence with the 43-keV transition suggests that this transition may feed another, longer lived isomeric state with a half-life of the order of milliseconds or greater. However, the present experiment was not sensitive to the decay of this new Jπ=(7-) state by internal conversion or even β decay.

Original language	English
Article number	034304
Journal	Physical Review C - Nuclear Physics
Volume	78
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.78.034304
Publication status	Published - 3 Sept 2008

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Rigby, S. V., Cullen, D. M., Mason, P. J. R., Scholes, D. T., Scholey, C., Rahkila, P., Eeckhaudt, S., Grahn, T., Greenlees, P., Jones, P. M., Julin, R., Juutinen, S., Kettunen, H., Leino, M., Leppänen, A. P., Nieminen, P., Nyman, M., Pakarinen, J., & Uusitalo, J. (2008). Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75. Physical Review C - Nuclear Physics, 78(3), Article 034304. https://doi.org/10.1103/PhysRevC.78.034304

@article{8847011e4a7f4639ae87d0ed12155fe0,

title = "Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75",

abstract = "An experiment has been performed to populate several extremely neutron-deficient nuclei around the mass-140 region of the nuclear chart, using a beam of Fe54 on a Mo92 target at an energy of 315 MeV. Analysis of these data using recoil-isomer tagging has established that the yrast πh11/2?νh11/2, Jπ=(8+), bandhead state in Pm136 is isomeric with a half-life of 1.5(1) μs. This isomeric state decays via a 43-keV, probable-E1 transition to a Jπ=(7-) state. Consideration of the theoretical Nilsson orbitals near the Fermi surface suggests that the Jπ=(8+) state has a νh11/2[505]112-? πh11/2[532]52- configuration, which decays to the Jπ=(7-) state with a νh11/2[505]112-?πd5/2[411]32+ configuration. Differences in the shape-driving effects for these two configurations is reasoned to be responsible for the long half-life of the Jπ=(8+) isomeric state. The non-observation of other γ rays in prompt or delayed coincidence with the 43-keV transition suggests that this transition may feed another, longer lived isomeric state with a half-life of the order of milliseconds or greater. However, the present experiment was not sensitive to the decay of this new Jπ=(7-) state by internal conversion or even β decay.",

author = "Rigby, {S. V.} and Cullen, {D. M.} and Mason, {P. J.R.} and Scholes, {D. T.} and C. Scholey and P. Rahkila and S. Eeckhaudt and T. Grahn and P. Greenlees and Jones, {P. M.} and R. Julin and S. Juutinen and H. Kettunen and M. Leino and Lepp{\"a}nen, {A. P.} and P. Nieminen and M. Nyman and J. Pakarinen and J. Uusitalo",

year = "2008",

month = sep,

day = "3",

doi = "10.1103/PhysRevC.78.034304",

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Rigby, SV, Cullen, DM, Mason, PJR, Scholes, DT, Scholey, C, Rahkila, P, Eeckhaudt, S, Grahn, T, Greenlees, P, Jones, PM, Julin, R, Juutinen, S, Kettunen, H, Leino, M, Leppänen, AP, Nieminen, P, Nyman, M, Pakarinen, J & Uusitalo, J 2008, 'Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75', Physical Review C - Nuclear Physics, vol. 78, no. 3, 034304. https://doi.org/10.1103/PhysRevC.78.034304

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T1 - Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75

AU - Rigby, S. V.

AU - Cullen, D. M.

AU - Mason, P. J.R.

AU - Scholes, D. T.

AU - Scholey, C.

AU - Rahkila, P.

AU - Eeckhaudt, S.

AU - Grahn, T.

AU - Greenlees, P.

AU - Jones, P. M.

AU - Julin, R.

AU - Juutinen, S.

AU - Kettunen, H.

AU - Leino, M.

AU - Leppänen, A. P.

AU - Nieminen, P.

AU - Nyman, M.

AU - Pakarinen, J.

AU - Uusitalo, J.

PY - 2008/9/3

Y1 - 2008/9/3

N2 - An experiment has been performed to populate several extremely neutron-deficient nuclei around the mass-140 region of the nuclear chart, using a beam of Fe54 on a Mo92 target at an energy of 315 MeV. Analysis of these data using recoil-isomer tagging has established that the yrast πh11/2?νh11/2, Jπ=(8+), bandhead state in Pm136 is isomeric with a half-life of 1.5(1) μs. This isomeric state decays via a 43-keV, probable-E1 transition to a Jπ=(7-) state. Consideration of the theoretical Nilsson orbitals near the Fermi surface suggests that the Jπ=(8+) state has a νh11/2[505]112-? πh11/2[532]52- configuration, which decays to the Jπ=(7-) state with a νh11/2[505]112-?πd5/2[411]32+ configuration. Differences in the shape-driving effects for these two configurations is reasoned to be responsible for the long half-life of the Jπ=(8+) isomeric state. The non-observation of other γ rays in prompt or delayed coincidence with the 43-keV transition suggests that this transition may feed another, longer lived isomeric state with a half-life of the order of milliseconds or greater. However, the present experiment was not sensitive to the decay of this new Jπ=(7-) state by internal conversion or even β decay.

AB - An experiment has been performed to populate several extremely neutron-deficient nuclei around the mass-140 region of the nuclear chart, using a beam of Fe54 on a Mo92 target at an energy of 315 MeV. Analysis of these data using recoil-isomer tagging has established that the yrast πh11/2?νh11/2, Jπ=(8+), bandhead state in Pm136 is isomeric with a half-life of 1.5(1) μs. This isomeric state decays via a 43-keV, probable-E1 transition to a Jπ=(7-) state. Consideration of the theoretical Nilsson orbitals near the Fermi surface suggests that the Jπ=(8+) state has a νh11/2[505]112-? πh11/2[532]52- configuration, which decays to the Jπ=(7-) state with a νh11/2[505]112-?πd5/2[411]32+ configuration. Differences in the shape-driving effects for these two configurations is reasoned to be responsible for the long half-life of the Jπ=(8+) isomeric state. The non-observation of other γ rays in prompt or delayed coincidence with the 43-keV transition suggests that this transition may feed another, longer lived isomeric state with a half-life of the order of milliseconds or greater. However, the present experiment was not sensitive to the decay of this new Jπ=(7-) state by internal conversion or even β decay.

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U2 - 10.1103/PhysRevC.78.034304

DO - 10.1103/PhysRevC.78.034304

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JF - Physical Review C - Nuclear Physics

IS - 3

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ER -

Decay of a πh11/2νh11/2 microsecond isomer in 61136Pm75

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