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Title: Spin differences in the Zr 90 compound nucleus induced by ( p , p ' ) , ( p , d ) , and ( p , t ) surrogate reactions

Abstract

Here, the effect of the production mechanism on the decay of a compound nucleus is investigated. The nucleus 90Zr was produced by three different reactions, namely 90Zr (p,p') 90Zr, 91Zr (p,d) 90Zr, and 92Zr (p,t) 90Zr , which served as surrogate reactions for 89Zr (n,γ). The spin-parity (J π) distributions of the states populated by these reactions were studied to investigate the surrogate reaction approach, which aims at indirectly determining cross sections for compound-nuclear reactions involving unstable targets such as 89Zr. Discrete γ rays, associated with transitions in 90Zr and 89Zr, were measured in coincidence with light ions for scattering angles of 25°–60° and 90Zr excitation energies extending above the neutron separation energy. The measured transition systematics were used to gain insights into the J π distributions of 90Zr. The 90Zr (p,p') reaction was found to produce fewer γ rays associated with transitions involving high spin states (J = 6–8 ℏ) than the other two reactions, suggesting that inelastic scattering preferentially populates states in 90Zr that have lower spins than those populated in the transfer reactions investigated. The γ-ray production was also observed to vary by factors of 2–3 with the angle at which the outgoing particle was detected. Thesemore » findings are relevant to the application of the surrogate reaction approach.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Saint Mary's College, Nova Scotia (Canada)
  3. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
  4. Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE; Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1432958
Alternate Identifier(s):
OSTI ID: 1225124
Report Number(s):
LLNL-JRNL-704140
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US1803019
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 5; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Ota, S., Burke, J. T., Casperson, R. J., Escher, J. E., Hughes, R. O., Ressler, J. J., Scielzo, N. D., Thompson, I. J., Austin, R. A. E., Abromeit, B., Foley, N. J., McCleskey, E., McCleskey, M., Park, H. I., Saastamoinen, A., and Ross, T. J. Spin differences in the Zr90 compound nucleus induced by (p,p') , (p,d) , and (p,t) surrogate reactions. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.92.054603.
Ota, S., Burke, J. T., Casperson, R. J., Escher, J. E., Hughes, R. O., Ressler, J. J., Scielzo, N. D., Thompson, I. J., Austin, R. A. E., Abromeit, B., Foley, N. J., McCleskey, E., McCleskey, M., Park, H. I., Saastamoinen, A., & Ross, T. J. Spin differences in the Zr90 compound nucleus induced by (p,p') , (p,d) , and (p,t) surrogate reactions. United States. doi:10.1103/PhysRevC.92.054603.
Ota, S., Burke, J. T., Casperson, R. J., Escher, J. E., Hughes, R. O., Ressler, J. J., Scielzo, N. D., Thompson, I. J., Austin, R. A. E., Abromeit, B., Foley, N. J., McCleskey, E., McCleskey, M., Park, H. I., Saastamoinen, A., and Ross, T. J. Wed . "Spin differences in the Zr90 compound nucleus induced by (p,p') , (p,d) , and (p,t) surrogate reactions". United States. doi:10.1103/PhysRevC.92.054603. https://www.osti.gov/servlets/purl/1432958.
@article{osti_1432958,
title = {Spin differences in the Zr90 compound nucleus induced by (p,p') , (p,d) , and (p,t) surrogate reactions},
author = {Ota, S. and Burke, J. T. and Casperson, R. J. and Escher, J. E. and Hughes, R. O. and Ressler, J. J. and Scielzo, N. D. and Thompson, I. J. and Austin, R. A. E. and Abromeit, B. and Foley, N. J. and McCleskey, E. and McCleskey, M. and Park, H. I. and Saastamoinen, A. and Ross, T. J.},
abstractNote = {Here, the effect of the production mechanism on the decay of a compound nucleus is investigated. The nucleus 90Zr was produced by three different reactions, namely 90Zr (p,p') 90Zr, 91Zr (p,d) 90Zr, and 92Zr (p,t) 90Zr , which served as surrogate reactions for 89Zr (n,γ). The spin-parity (Jπ) distributions of the states populated by these reactions were studied to investigate the surrogate reaction approach, which aims at indirectly determining cross sections for compound-nuclear reactions involving unstable targets such as 89Zr. Discrete γ rays, associated with transitions in 90Zr and 89Zr, were measured in coincidence with light ions for scattering angles of 25°–60° and 90Zr excitation energies extending above the neutron separation energy. The measured transition systematics were used to gain insights into the Jπ distributions of 90Zr. The 90Zr (p,p') reaction was found to produce fewer γ rays associated with transitions involving high spin states (J = 6–8 ℏ) than the other two reactions, suggesting that inelastic scattering preferentially populates states in 90Zr that have lower spins than those populated in the transfer reactions investigated. The γ-ray production was also observed to vary by factors of 2–3 with the angle at which the outgoing particle was detected. These findings are relevant to the application of the surrogate reaction approach.},
doi = {10.1103/PhysRevC.92.054603},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 92,
place = {United States},
year = {2015},
month = {11}
}

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