First observation of low-energy γ-ray enhancement in the rare-earth region

Simon, Anna; Guttormsen, M.; Larsen, A. C.; Beausang, C. W.; Humby, P.; Burke, J. T.; Casperson, R. J.; Hughes, R. O.; Ross, T. J.; Allmond, James M.; Chyzh, R.; Dag, M.; Koglin, J.; McCleskey, E.; McCleskey, M.; Ota, S.; Saastamoinen, A.

doi:10.1103/PhysRevC.93.034303

Title: First observation of low-energy γ-ray enhancement in the rare-earth region

Journal Article · Fri Mar 04 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.034303· OSTI ID:1267050

Simon, Anna ^[1]; Guttormsen, M. ^[2]; Larsen, A. C. ^[2]; Beausang, C. W. ^[2]; Humby, P. ^[3]; Burke, J. T. ^[4]; Casperson, R. J. ^[4]; Hughes, R. O. ^[4]; Ross, T. J. ^[5]; Allmond, James M. ^[6]; Chyzh, R. ^[7]; Dag, M. ^[7]; Koglin, J. ^[4]; McCleskey, E. ^[7]; McCleskey, M. ^[7]; Ota, S. ^[8]; Saastamoinen, A. ^[7]

Univ. of Notre Dame, Notre Dame, IN (United States)
Univ. of Oslo, Oslo (Norway)
Univ. of Richmond, Richmond, VA (United States); Univ. of Surrey, Surrey (United Kingdom)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Kentucky, Lexington, KY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Texas A & M Univ., College Station, TX (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Rutgers Univ., New Brunswick, NJ (United States)

Here, the γ-ray strength function and level density in the quasi-continuum of ^151,153Sm have been measured using bismuth germanate shielded Ge clover detectors of the STARLiTeR system. The Compton shields allow an extraction of the γ strength down to unprecedentedly low γ energies of ≈ 500 keV. For the first time an enhanced low-energy γ-ray strength has been observed in the rare-earth region. In addition, for the first time both the upbend and the well-known scissors resonance have been observed simultaneously for the same nucleus. Hauser-Feshbach calculations show that this strength enhancement at low γ energies could have an impact of 2 3 orders of magnitude on the (n, γ) reaction rates for r-process nucleosynthesis.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; Research Council of Norway (NFR); National Science Foundation (NSF); European Research Council (ERC)

Grant/Contract Number:: AC52-07NA27344; AC05-00OR22725; NA0001801; FG02-05ER41379; PHY-1430152; 205528; 637686

OSTI ID:: 1267050

Alternate ID(s):: OSTI ID: 1240452; OSTI ID: 1432959

Report Number(s):: LLNL-JRNL-704138; KB0401022; ERKBP06

Journal Information:: Physical Review C, Vol. 93, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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Nuclear dipole response in the finite-temperature relativistic time-blocking approximation Wibowo, Herlik; Litvinova, Elena Physical Review C, Vol. 100, Issue 2 https://doi.org/10.1103/physrevc.100.024307	journal	August 2019
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Nuclear Dipole Response in the Finite-Temperature Relativistic Time Blocking Approximation Wibowo, Herlik; Litvinova, Elena arXiv https://doi.org/10.48550/arxiv.1810.01456	text	January 2018

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