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Title: Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the ( p , t ) reaction

Abstract

The spin distribution populated in the $$^{150}\mathrm{Sm}(p,t)$$ reaction with 25 MeV protons has been investigated here using the silicon telescope and high-purity germanium array Hyperion. Angular distributions of outgoing tritons and relative intensities of $${\gamma}$$ rays from low-lying levels are used to deduce the initial spin distribution using statistical calculations and are compared with a semiclassical model of the $(p,t)$ reaction. Experimental and theoretical results suggest a peak strength near $$4{\hbar}$$ when gated on outgoing tritons detected in Hyperion, while the full $$4{\pi}$$ distribution may peak near $$2{\hbar}$$. Additionally, the average $${\gamma}$$-neutron branching ratio is determined from the data with the aid of one of two new codes presented in this work. Finally, the analysis is extended to other recent studies of $$^{152,154}\mathrm{Sm}(p,t)$$ to form systematics of the spin-dependence of the surrogate method applied to heavy nuclei in the transitional to deformed region.

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [5];  [4];  [6];  [2]
  1. Univ. of Notre Dame, IN (United States). Dept. of Physics. Joint Inst. for Nuclear Astrophysics; Univ. of Richmond, VA (United States). Dept. of Physics
  2. Univ. of Richmond, VA (United States). Dept. of Physics
  3. Univ. of Richmond, VA (United States). Dept. of Physics; Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  4. Univ. of Notre Dame, IN (United States). Dept. of Physics. Joint Inst. for Nuclear Astrophysics
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
  6. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
Publication Date:
Research Org.:
Univ. of Richmond, VA (United States); Univ. of Notre Dame, IN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1482823
Alternate Identifier(s):
OSTI ID: 1478694
Grant/Contract Number:  
NA0002914; NA0003780; AC52-07NA27344; NA0003841
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; electromagnetic transitions; statistical phenomena & chaos; transfer reactions

Citation Formats

Cooper, N., Beausang, C. W., Humby, P., Simon, A., Burke, J. T., Hughes, R. O., Ota, S., Reingold, C., Saastamoinen, A., and Wilson, E. Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the (p,t) reaction. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.044618.
Cooper, N., Beausang, C. W., Humby, P., Simon, A., Burke, J. T., Hughes, R. O., Ota, S., Reingold, C., Saastamoinen, A., & Wilson, E. Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the (p,t) reaction. United States. doi:10.1103/PhysRevC.98.044618.
Cooper, N., Beausang, C. W., Humby, P., Simon, A., Burke, J. T., Hughes, R. O., Ota, S., Reingold, C., Saastamoinen, A., and Wilson, E. Wed . "Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the (p,t) reaction". United States. doi:10.1103/PhysRevC.98.044618.
@article{osti_1482823,
title = {Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the (p,t) reaction},
author = {Cooper, N. and Beausang, C. W. and Humby, P. and Simon, A. and Burke, J. T. and Hughes, R. O. and Ota, S. and Reingold, C. and Saastamoinen, A. and Wilson, E.},
abstractNote = {The spin distribution populated in the $^{150}\mathrm{Sm}(p,t)$ reaction with 25 MeV protons has been investigated here using the silicon telescope and high-purity germanium array Hyperion. Angular distributions of outgoing tritons and relative intensities of ${\gamma}$ rays from low-lying levels are used to deduce the initial spin distribution using statistical calculations and are compared with a semiclassical model of the $(p,t)$ reaction. Experimental and theoretical results suggest a peak strength near $4{\hbar}$ when gated on outgoing tritons detected in Hyperion, while the full $4{\pi}$ distribution may peak near $2{\hbar}$. Additionally, the average ${\gamma}$-neutron branching ratio is determined from the data with the aid of one of two new codes presented in this work. Finally, the analysis is extended to other recent studies of $^{152,154}\mathrm{Sm}(p,t)$ to form systematics of the spin-dependence of the surrogate method applied to heavy nuclei in the transitional to deformed region.},
doi = {10.1103/PhysRevC.98.044618},
journal = {Physical Review C},
issn = {2469-9985},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
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