Improved measurement of the half-life of the Jπ = 8- nuclear isomer 152m2 Eu

Humby, Peter; Simon, Anna; Beausang, C. W.; Ross, T. J.; Hughes, R. O.; Burke, J. T.; Casperson, R. J.; Koglin, J.; Ota, S.; Allmond, James M.; McCleskey, M.; McCleskey, E.; Saastamoinen, A.; Chyzh, R.; Dag, M.; Gell, K.; Tarlow, T.; Vyas, G.

doi:10.1103/PhysRevC.91.024322

Improved measurement of the half-life of the J^π = 8^- nuclear isomer ^152m₂ Eu

Journal Article · Sun Feb 22 23:00:00 EST 2015 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.91.024322· OSTI ID:1265352

Humby, Peter ^[1]; Simon, Anna ^[2]; Beausang, C. W. ^[2]; Ross, T. J. ^[3]; Hughes, R. O. ^[4]; Burke, J. T. ^[4]; Casperson, R. J. ^[4]; Koglin, J. ^[4]; Ota, S. ^[4]; Allmond, James M. ^[5]; McCleskey, M. ^[6]; McCleskey, E. ^[6]; Saastamoinen, A. ^[6]; Chyzh, R. ^[6]; Dag, M. ^[6]; Gell, K. ^[2]; Tarlow, T. ^[2]; Vyas, G. ^[2]

University of Richmond, Richmond, Virginia (United States). Department of Physics; Univ. of Surrey, Surrey (United Kingdom). Department of Physics
University of Richmond, Richmond, VA (United States). Department of Physics
Univ. of Kentucky, Lexington, KY (United States). Department of Chemistry
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
Texas A & M Univ., College Station, TX (United States). Cyclotron Institute

The standard γ-ray energy calibration source ¹⁵²Eu is well known based on the 13.5 y decay of its ground state. Nevertheless, in addition to this decay ¹⁵²Eu also has two relatively long-lived isomeric states: a 9 h J^π=0^- state at E^*=46 keV and a 96 min J^π=8^- state at E^*=148 keV. In this work, we report a new measurement of the half-lives of both of these isomeric states. Excited states in ¹⁵²Eu were populated following the ¹⁵⁴Sm (p,3n) reaction using a 25 MeV proton beam from the K-150 cyclotron at the Cyclotron Institute of Texas A&M University. Post irradiation, γ rays from the de-excitation of the long lived isomeric states were measured using the six BGO shielded high-purity germanium (HPGe) clover detectors that are part of the STARLiTeR array. The half-life of the J^π=8^- isomer ^152m₂Eu was obtained by measuring the decrease in intensity of the 90 keV γ ray from the cascade to the ground state. The half-life of this state was measured to be 95.8(4) min which is in agreement with and significantly more precise than the previously measured value of 96(1) min. In a manner similar to the ground state the second long-lived isomer ^151m₁Eu, the J^π=0^- state at 46 keV, β decays to excited states in ¹⁵²Gd and ¹⁵²Sm. Also, the half-life of this state was measured to be 9.39(7) h using five γ-ray transitions.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; FG02-05ER41379; FG52-09NA29467; NA0001801; AC52-07NA27344

OSTI ID:: 1265352

Alternate ID(s):: OSTI ID: 1181429
OSTI ID: 1787192

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 91; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

First observation of low-energy γ -ray enhancement in the rare-earth region Simon, A.; Guttormsen, M.; Larsen, A. C. Physical Review C, Vol. 93, Issue 3 https://doi.org/10.1103/physrevc.93.034303	journal	March 2016
First observation of low-energy γ-ray enhancement in the rare-earth region Simon, A.; Guttormsen, M.; Larsen, A. C. arXiv https://doi.org/10.48550/arxiv.1602.05824	text	January 2016

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