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Part I. Study of Some Beta Decays in the SD Shell. Part II. Comparison of Experimental Reaction Cross Sections with the Hauser-Feshbach Model

Citation

Mann, Frederick Michael (1975) Part I. Study of Some Beta Decays in the SD Shell. Part II. Comparison of Experimental Reaction Cross Sections with the Hauser-Feshbach Model. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/3ke6-7w63. https://resolver.caltech.edu/CaltechTHESIS:03192025-222231997

Abstract

Part One

The beta decays of 19Ne, 23Mg, 27Si, 37K, 38K, and 39Ca have been studied by observing the delayed gamma radiation with large vo1ume Ge(Li) detectors. A pneumatic shuttle was used so that weak beta transitions could be observed. Two previously unobserved allowed transitions have been found, and the uncertainty for most of the previously known transitions has been reduced. Limits for unobserved transitions have been strengthened. A comparison is made between the predictions of various nuclear models, particularly the many-particle shell model; and observed values.

Part Two

Cross sections have been measured by the activation method for 23Na(p,n)23Mg, 35Cl(α,n) 38K, and 63Cu(p,n)63Zn from threshold to 11 MeV and for 59Co(α,n)62Cu, 63Cu(α,n)66Ga, and 65Cu(α,n)68Ga from threshold to 19 MeV. The excitation functions are compared with the predictions of the Hauser-Feshbach model of nuclear reactions. If resonance effects ar2 averaged, then using established parameters for the nuclear potentials and for the nuclear level densities, the predicted values are within a factor of 2 of the experimental values for practically all cross sections measured. For cases where direct reactions are not important, agreement to within 20% is obtained.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Kavanagh, Ralph William
Group:Kellogg Radiation Laboratory
Thesis Committee:
  • Unknown, Unknown
Defense Date:7 January 1975
Funders:
Funding AgencyGrant Number
National Science FoundationGP-28027
Record Number:CaltechTHESIS:03192025-222231997
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:03192025-222231997
DOI:10.7907/3ke6-7w63
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17074
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:25 Mar 2025 18:30
Last Modified:25 Mar 2025 18:30

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