University of Notre Dame
Browse

File(s) under permanent embargo

An Alternative 3α Process: The 2H(α,γ) 6Li(α,γ) 10B(α,d) 12C Reaction in Primordial Stars

thesis
posted on 2022-03-28, 00:00 authored by August Gula

The recent discovery of very old Carbon Enhanced Metal Poor (CEMP) stars has left questions as to their origins, in particular with respect to the origin of CNO element production in the early universe. The present research aims to investigate the 2H(α,γ) 6Li(α,γ) 10B(α,d)12C reaction chain, which may prove to be key in answering this question. The 6Li(α,γ) and 10B(α,d) reactions are studied here with some considerations of the 10B(α,p) channel. These measurements were conducted at the Nuclear Science Laboratory (NSL) at the University of Notre Dame du lac. The 10B + α reactions were studied using silicon surface barrier detectors in close geometry, whereas the 6Li + α reaction used a combination of Cerium Tribromide and High-Purity Germanium detectors. R-Matrix analyses were performed using the AZURE2 code and fits are presented in the text. Presently, a large boost to the 10B + α reactions is seen at T = 0.1 GK and more accurate broad resonance contributions have been determined for the 6Li + α reaction.

History

Date Modified

2022-04-08

Defense Date

2022-03-17

CIP Code

  • 40.0801

Research Director(s)

Michael C. Wiescher

Degree

  • Doctor of Philosophy

Degree Level

  • Doctoral Dissertation

Alternate Identifier

1309295030

Library Record

6183064

OCLC Number

1309295030

Program Name

  • Physics

Usage metrics

    Dissertations

    Categories

    No categories selected

    Keywords

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC