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Study of Nuclear Level Densities from Deuteron-Induced Reactions on 54,56,58Fe and 63,65Cu

Ramirez, Anthony Paul D.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417437958

Abstract Details

2014, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
The nuclear level density is known to be the major source of uncertainty in the calculation of compound cross sections. The problem is attributed to the fact that most experimental level density information is obtained from the neutron resonance data, which are confined to narrow ranges of excitation energy and angular momentum. In addition, the level density derived from the average neutron resonance spacing is strongly dependent on the spin cut-off parameter, which is not known experimentally at the neutron binding energy. To minimize these uncertainties, we study the nuclear level density using the analysis of evaporation spectra from compound nuclear reactions. Double diff erential cross sections and angular distributions for the (d,n), (d,p), (d,d), and (d,a ) reactions have been measured with deuteron energies between 5 and 9 MeV. The angular distributions of outgoing particles have indicated that cross sections measured at backward angles are dominated by compound reaction mechanism. These cross sections were used to test known nuclear level density models commonly applied in nuclear reaction codes: (1) the Fermi gas model [1]; (2) the Gilbert-Cameron model [2]; and (3) the microscopic model using the Hartree-Fock-Bogoliubov method [3]. The nuclear level densities of 64Zn, 66Zn, 55Fe, 57Fe, 55Co, 57Co, 59Co, 52Mn, 54Mn, and 56Mn have been deduced from the experimental compound cross sections. Most of the best-fit parameters have been found to agree with the Gilbert-Cameron model with parameters according to Iljinov systematics [4]. The compound fractions of the total cross sections have been observed to decrease with increasing bombarding energy for all reactions. The contribution of deuteron breakup has negligible effect in the backward angles.
Alexander Voinov, Ph.D. (Advisor)
Carl Brune, Ph.D. (Committee Member)
Kenneth Hicks, Ph.D. (Committee Member)
Lauren McMills, Ph.D. (Committee Member)
137 p.
Nuclear Physics
nuclear level density

Recommended Citations

Citations

  • Ramirez, A. P. D. (2014). Study of Nuclear Level Densities from Deuteron-Induced Reactions on 54,56,58Fe and 63,65Cu [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417437958

    APA Style (7th edition)

  • Ramirez, Anthony Paul. Study of Nuclear Level Densities from Deuteron-Induced Reactions on 54,56,58Fe and 63,65Cu. 2014. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417437958.

    MLA Style (8th edition)

  • Ramirez, Anthony Paul. "Study of Nuclear Level Densities from Deuteron-Induced Reactions on 54,56,58Fe and 63,65Cu." Doctoral dissertation, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1417437958

    Chicago Manual of Style (17th edition)

ohiou1417437958
458
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This open access ETD is published by Ohio University and OhioLINK.