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dc.contributor.advisorSarazin, Frederic
dc.contributor.authorMiller, Eric D.
dc.date.accessioned2022-07-19T20:41:37Z
dc.date.available2022-07-19T20:41:37Z
dc.date.issued2021
dc.identifierMiller_mines_0052N_12282.pdf
dc.identifierT 9239
dc.identifier.urihttps://hdl.handle.net/11124/14261
dc.descriptionIncludes bibliographical references.
dc.description2021 Fall.
dc.description.abstractDoppler Shift Attenuation Methods (DSAM) are capable of determining very short lifetimes of excited states (from femtoseconds to picoseconds). Given the evolution of DSAM experiments and computational tools available to nuclear physicists, it is surprising that no standard implementation exists for simulating DSAM in Geant4 (G4), despite being a widely-used simulation framework and often considered the golden standard for simulating nuclear and high energy physics. This document demonstrated an implementation of DSAM in G4. The key additions to G4 were an improved representation of the Breit-Wigner width of unbound states, accurate in-flight radioactive decay, and precise control over the kinetic energy loss per simulation step. This implementation of DSAM is built for the use of an upcoming experiment investigating the nuclear structure and decay scheme of \atom{11}{}{Li}{}{}. Validation of the DSAM implementation used data from a previous iteration of the experiment with earlier generation detectors. The simplest line-shape in the measured data was used to verify that the new method can backcalculate the same details of the decay scheme as previous studies. When using the same energy loss data as earlier works, the additions to G4 recovered the half-life of the $0^+_2$ state of \atom{10}{}{Be}{}{} to be 991 fs, well within statistical error of the value published in \cite{mattoon2009}: 983 $\pm 27$(stat.) $^{+200}_{-120}$(syst.) fs. Using G4 for simulating DSAM allows easy access to several pre-existing energy loss models. The results of DSAM are very sensitive to the energy loss model used in the simulation. This document investigated the systematic error due to the range of energy losses and stopping powers predicted by various models. For the $0^+_2$ state of \atom{10}{}{Be}{}{}, the predicted half-life ranged from 981 fs to over 1500 fs depending on the employed energy loss model. This range of values is greater than the suggested systematic error reported 983 $^{+200}_{-120}$(syst.) fs in \cite{mattoon2009}.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2021 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.subjectDoppler broadening
dc.subjectGeant4
dc.subjecthalo nuclei
dc.titleReproducing the line-shape of a Doppler-broadened Gamma-line in 10Be following the beta-decay of 11Li using Geant4
dc.typeText
dc.date.updated2022-07-18T16:44:26Z
dc.contributor.committeememberGreife, Uwe
dc.contributor.committeememberLeach, Kyle
thesis.degree.nameMaster of Science (M.S.)
thesis.degree.levelMasters
thesis.degree.disciplinePhysics
thesis.degree.grantorColorado School of Mines


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