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

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. These findings aremore »« less

Authors:

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

Publication Date:: Wed Nov 04 00:00:00 EST 2015

Research Org.:: Lawrence Livermore National Laboratory (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.

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                    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.  https://doi.org/10.1103/PhysRevC.92.054603

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                    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.  https://doi.org/10.1103/PhysRevC.92.054603.  https://www.osti.gov/servlets/purl/1432958.

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@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         = {Wed Nov 04 00:00:00 EST 2015},

  month        = {Wed Nov 04 00:00:00 EST 2015}

}

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Works referencing / citing this record:

Toward a complete theory for predicting inclusive deuteron breakup away from stability
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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

Citation Formats

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

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Neutron-induced fission cross sections simulated from $(t, p f)$ results
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Measurement of the ${}^{240}{Am} (n, f$ ) cross section using the surrogate-ratio method
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