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Title: Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction

Abstract

New levels and γ-ray transitions were identified in 150,152Sm utilizing the (p,t) reaction and particle-γ coincidence data. A large, peak-like structure observed between 2.3–3.0 MeV in excitation energy in the triton energy spectra was also investigated. The orbital angular-momentum transfer was probed by comparing the experimental angular distributions of the outgoing tritons to calculated distorted wave Born approximation curves. The angular distributions of the outgoing tritons populating the peak-like structure are remarkably similar in the two reactions and are significantly different from the angular distributions associated with the nearby continuum region. Relative partial cross sections for the observed levels, angle averaged between 34 and 58 degrees, were measured. In 150Sm, 39(4)% of the strength of the peak-like structure could be accounted for by the observed discrete states. This compares with a value of 93(15)% for 152Sm

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [6];  [6];  [3];  [5];  [5];  [6];  [6];  [5];  [7];  [6];  [3];  [3]
  1. Univ. of Richmond, Richmond, VA (United States); Univ. of Surrey, Surrey (United Kingdom)
  2. Univ. of Richmond, Richmond, VA (United States); Univ. of Notre Dame, IN (United States)
  3. Univ. of Richmond, Richmond, VA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Texas A & M Univ., College Station, TX (United States)
  7. Univ. of Kentucky, Lexington, KY (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1337046
Alternate Identifier(s):
OSTI ID: 1335725; OSTI ID: 1557939
Report Number(s):
LLNL-JRNL-737686
Journal ID: ISSN 2469-9985; KB0401022; ERKBP06
Grant/Contract Number:  
AC05-00OR22725; SC0014277; FG02-05ER41379; FG02-93ER40773; NA0002914; NA0001801; FG52-09NA29467; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Physics, Nuclear science and engineering, Physics - Nuclear physics and radiation physics

Citation Formats

Peter, Humby, Simon, Anna, Beausang, C. W., Allmond, James M., Burke, J. T., Casperson, R. J., Chyzh, R., Dag, M., Gell, K., Hughes, R. O., Koglin, J., McCleskey, E., McCleskey, M., Ota, S., Ross, T. J., Saastamoinen, A., Tarlow, T., and Vyas, G. Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.94.064314.
Peter, Humby, Simon, Anna, Beausang, C. W., Allmond, James M., Burke, J. T., Casperson, R. J., Chyzh, R., Dag, M., Gell, K., Hughes, R. O., Koglin, J., McCleskey, E., McCleskey, M., Ota, S., Ross, T. J., Saastamoinen, A., Tarlow, T., & Vyas, G. Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction. United States. doi:10.1103/PhysRevC.94.064314.
Peter, Humby, Simon, Anna, Beausang, C. W., Allmond, James M., Burke, J. T., Casperson, R. J., Chyzh, R., Dag, M., Gell, K., Hughes, R. O., Koglin, J., McCleskey, E., McCleskey, M., Ota, S., Ross, T. J., Saastamoinen, A., Tarlow, T., and Vyas, G. Wed . "Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction". United States. doi:10.1103/PhysRevC.94.064314. https://www.osti.gov/servlets/purl/1337046.
@article{osti_1337046,
title = {Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction},
author = {Peter, Humby and Simon, Anna and Beausang, C. W. and Allmond, James M. and Burke, J. T. and Casperson, R. J. and Chyzh, R. and Dag, M. and Gell, K. and Hughes, R. O. and Koglin, J. and McCleskey, E. and McCleskey, M. and Ota, S. and Ross, T. J. and Saastamoinen, A. and Tarlow, T. and Vyas, G.},
abstractNote = {New levels and γ-ray transitions were identified in 150,152Sm utilizing the (p,t) reaction and particle-γ coincidence data. A large, peak-like structure observed between 2.3–3.0 MeV in excitation energy in the triton energy spectra was also investigated. The orbital angular-momentum transfer was probed by comparing the experimental angular distributions of the outgoing tritons to calculated distorted wave Born approximation curves. The angular distributions of the outgoing tritons populating the peak-like structure are remarkably similar in the two reactions and are significantly different from the angular distributions associated with the nearby continuum region. Relative partial cross sections for the observed levels, angle averaged between 34 and 58 degrees, were measured. In 150Sm, 39(4)% of the strength of the peak-like structure could be accounted for by the observed discrete states. This compares with a value of 93(15)% for 152Sm},
doi = {10.1103/PhysRevC.94.064314},
journal = {Physical Review C},
number = ,
volume = 94,
place = {United States},
year = {2016},
month = {12}
}

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