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Studying the Fusion Evaporation Reaction (a,n) with 54Fe, 56Fe, 57Fe, and 58Fe

Alanazi, Nadyah L.
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522335214406224

Abstract Details

2018, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
Accurate calculations of nuclear reaction cross sections are in high demand in different areas including basic nuclear physics, astrophysics, and reactor technology. Fusion evaporation reactions are the main type of reactions occurring at low energies of interacting nuclei. The Hauser-Feshbach (HF) theory, based on compound reaction mechanism, is the main tool used for cross section calculations of this type of reactions. It is generally understood that the main uncertainty of calculations is due to uncertainties in input nuclear structure parameters used as inputs in HF calculations. The most uncertain one is the nuclear level density and, more specifically, the spin cutoff parameter determining the spin distribution of the nuclear level density. In this work, the measurements of neutron spectra and neutron angular distributions from 54,56,57,58Fe(a,n)57,59,60,61Ni reactions were performed to study the spin cutoff parameter for 57,59,60,61Ni isotopes. Experiments were conducted on the tandem accelerator of the Edwards Laboratory using 13.5 MeV alpha beam and the swinger time of flight facility to detect neutrons. The experimental anisotropy of the symmetric neutron angular distributions from compound reactions was used to test different model predictions of the spin cut-off parameter. It was found that the spin cutoff parameter tends to be lower at low excitation energies compared to most popular level density models using, so called, the rigid body estimate.
Alexander Voinov (Advisor)
Carl Brune (Committee Member)
Alexander Neiman (Committee Member)
Green Douglas (Committee Member)
133 p.
Nuclear Physics
Level density; spin cut-off parameter; angular distribution; anisotropy

Recommended Citations

Citations

  • Alanazi, N. L. (2018). Studying the Fusion Evaporation Reaction (a,n) with 54Fe, 56Fe, 57Fe, and 58Fe [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522335214406224

    APA Style (7th edition)

  • Alanazi, Nadyah. Studying the Fusion Evaporation Reaction (a,n) with 54Fe, 56Fe, 57Fe, and 58Fe. 2018. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522335214406224.

    MLA Style (8th edition)

  • Alanazi, Nadyah. "Studying the Fusion Evaporation Reaction (a,n) with 54Fe, 56Fe, 57Fe, and 58Fe." Doctoral dissertation, Ohio University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1522335214406224

    Chicago Manual of Style (17th edition)

ohiou1522335214406224
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© 2018, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.
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