Spin differences in the Zr90 compound nucleus induced by (p,p') , (p,d) , and (p,t) surrogate reactions

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.

doi:10.1103/PhysRevC.92.054603

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

Journal Article · Wed Nov 04 04:00:00 UTC 2015 · Physical Review C, Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.92.054603 · OSTI ID:1432958

Ota, S. ^[1]; Burke, J. T. ^[1]; Casperson, R. J. ^[1]; Escher, J. E. ^[1]; Hughes, R. O. ^[1]; Ressler, J. J. ^[1]; Scielzo, N. D. ^[1]; Thompson, I. J. ^[1]; Austin, R. A. E. ^[2]; Abromeit, B. ^[3]; Foley, N. J. ^[3]; McCleskey, E. ^[3]; McCleskey, M. ^[3]; Park, H. I. ^[3]; Saastamoinen, A. ^[3]; Ross, T. J. ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Saint Mary's College, Nova Scotia (Canada)
Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry

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. These findings are relevant to the application of the surrogate reaction approach.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1432958

Report Number(s):: LLNL-JRNL-704140

Journal Information:: Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 5 Vol. 92; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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