Spin differences in the <math><mrow><mmultiscripts><mi>Zr</mi><mprescripts/><none/><mrow><mn>90</mn></mrow></mmultiscripts></mrow></math> compound nucleus induced by <math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><msup><mi>p</mi><mo>'</mo></msup><mo>)</mo></mrow></math> , <math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>d</mi><mo>)</mo></mrow></math> , and <math><mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi>t</mi><mo>)</mo></mrow></math> surrogate reactions [electronic resource]
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Livermore, Calif : Oak Ridge, Tenn. :
Lawrence Livermore National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2015.
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| Abstract: | Here, the effect of the production mechanism on the decay of a compound nucleus is investigated. The nucleus <sup>90</sup>Zr was produced by three different reactions, namely <sup>90</sup>Zr (p,p') <sup>90</sup>Zr, <sup>91</sup>Zr (p,d) <sup>90</sup>Zr, and <sup>92</sup>Zr (p,t) <sup>90</sup>Zr , which served as surrogate reactions for <sup>89</sup>Zr (n,?). The spin-parity (J<sup>?</sup>) 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 <sup>89</sup>Zr. Discrete ? rays, associated with transitions in <sup>90</sup>Zr and <sup>89</sup>Zr, were measured in coincidence with light ions for scattering angles of 25ʻ?60ʻ and <sup>90</sup>Zr excitation energies extending above the neutron separation energy. The measured transition systematics were used to gain insights into the J<sup>?</sup> distributions of <sup>90</sup>Zr. The <sup>90</sup>Zr (p,p') reaction was found to produce fewer ? rays associated with transitions involving high spin states (J = 6?8 ?) than the other two reactions, suggesting that inelastic scattering preferentially populates states in <sup>90</sup>Zr that have lower spins than those populated in the transfer reactions investigated. The ?-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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| Item Description: | Published through Scitech Connect. 11/04/2015. "LLNL-JRNL-704140." "Journal ID: ISSN 0556-2813." "PRVCAN." ": US1803019." 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. ; et al. USDOE. Japan Society for the Promotion of Science (JSPS) |
| Physical Description: | Size: PDF-file: 15 pages. |