"The (He3,D) Reaction On The N=28 Nuclei." by Dale D. Armstrong
 

Physics & Astronomy ETDs

Publication Date

3-16-1965

Abstract

A beam of 22-MeV He3 ions from the Los Alamos variable energy cyclotron was used to investigate the (He3,d) reaction on Ca48, v51, Cr52, and Fe54. A solid-state E-deltaE mass-identification detector system was used. The use of a summing preamplifier for perfoming the coherent addition of the E and 6E pulses allowed the energy resolution to be reduced to the inherent energy spread of the cyclotron beam, which is 100 to 120 keV. Levels or groups of levels were resolvable up to an excitation of 5 to 6 MeV for all the nuclei that were studied, and angular distributions were obtained for the deuterons corresponding to these levels. A modified version of the Gibbs-Tobocman distorted-wave calcu­lation was used to extract spectroscopic information concerning the levels. The formalism developed by Macfarlane and French for the j-j coupling version of the nuclear shell model was used to assign the

levels to the various single-particle states. The isobaric-spin split­

ting of the single-particle strength was observed for the 2p3/2 proton single-particle state in Co55. However, only the lower isobaric-spin components of the SP states were observed for all the other nuclei studied. The seniority mixing of the two 4+ states in Cr52 belonging to the (f7/2)^4 configuration was determined and compares favorably with the predictions made by Komada. Elastic-scattering data for 22-MeV He3 ions elastically scattered from Ca40, Ca48, V51 , Cr52, Fe54, and Fe58 were obtained. Optical-model fits to the elastic-scattering data provided the optical-model parameters for He^3 ions that were required for the distorted-wave calculations

Degree Name

Physics

Level of Degree

Doctoral

Department Name

Physics & Astronomy

First Committee Member (Chair)

Christopher Pratt Leavitt

Second Committee Member

John Root Green

Third Committee Member

Allen G. Blair

Language

English

Document Type

Dissertation

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