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. © 2008 The American Physical Society.

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

Keywords

ROTATIONAL BAND STRUCTURES
INERTIA
NUCLEI
REGION

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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{49155279369e4e22a2f7d8c55270e354,

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. {\textcopyright} 2008 The American Physical Society.",

keywords = "ROTATIONAL BAND STRUCTURES, INERTIA, NUCLEI, REGION",

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",

note = "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. Leppanen, A. -P. Nieminen, P. Nyman, M. Pakarinen, J. Uusitalo, J.",

year = "2008",

month = sep,

day = "3",

doi = "10.1103/PhysRevC.78.034304",

language = "English",

volume = "78",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

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

TY - JOUR

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.

N1 - 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. Leppanen, A. -P. Nieminen, P. Nyman, M. Pakarinen, J. 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. © 2008 The American Physical Society.

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. © 2008 The American Physical Society.

KW - ROTATIONAL BAND STRUCTURES

KW - INERTIA

KW - NUCLEI

KW - REGION

U2 - 10.1103/PhysRevC.78.034304

DO - 10.1103/PhysRevC.78.034304

M3 - Article

SN - 0556-2813

VL - 78

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 3

M1 - 034304

ER -

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

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Keywords

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