The Masses of Proton-Rich Isotopes of Nb, Mo, Tc, Ru and Rh and Their Influence on the Astrophysical rp and νp Processes

Show simple item record

dc.contributor.supervisor Sharma, Kumar (Physics and Astronomy) en
dc.contributor.author Fallis, Jennifer
dc.date.accessioned 2009-09-14T21:37:10Z
dc.date.available 2009-09-14T21:37:10Z
dc.date.issued 2009-09-14T21:37:10Z
dc.identifier.uri http://hdl.handle.net/1993/3210
dc.description.abstract The Canadian Penning Trap mass spectrometer located at Argonne National Laboratory has been built for the purpose of studying the masses of both stable and unstable nuclides. For this thesis 18 proton-rich unstable nuclides of elements Nb, Mo, Tc, Ru and Rh have been measured with this apparatus to an average precision of 7.8 x10^−8. The masses of 6 of these nuclides had not been measured when this thesis was undertaken, and 4 more were not known to the precisions required for use in astrophysical nucleosynthesis models. The masses of these nuclides were of particular interest as the reaction paths of two proposed nucleosynthetic processes, the rp and νp processes, pass through this region. The rp process is thought to occur in X-ray bursts and directly affects the X-ray luminosity which is emitted from these objects. The νp process is thought to occur in the inner regions of the material ejected during a core-collapse supernova explosion and is of particular interest as it may answer some outstanding questions about the origins of the chemical elements in the Universe. The Canadian Penning Trap and associated apparatus were used to determine the masses of 18 nuclides, some for the first time ever. Our measurements improve the precision on all of the masses, by a factor of 70 in some cases. Our results are necessary to determine the proton-separation energies for these nuclides which are critical for determining the paths and reaction rates of the rp and νp processes. In particular, the effect of our measurements of 92Ru and 93Rh on the expected production ratio of 92Mo to 94Mo in the νp process, and the effect of our measurement of 87Mo on the path of this process will be discussed. en
dc.format.extent 16998600 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject nuclear en
dc.subject mass en
dc.subject measurement en
dc.subject Penning en
dc.subject trap en
dc.subject Nb en
dc.subject Mo en
dc.subject Tc en
dc.subject Ru en
dc.subject Rh en
dc.subject rp-process en
dc.subject νp-process en
dc.title The Masses of Proton-Rich Isotopes of Nb, Mo, Tc, Ru and Rh and Their Influence on the Astrophysical rp and νp Processes en
dc.type info:eu-repo/semantics/doctoralThesis
dc.degree.discipline Physics and Astronomy en
dc.contributor.examiningcommittee Safi-Harb, Samar (Physics and Astronomy) Gwinner, Gerald (Physics and Astronomy) Perreault, Hélène (Chemistry) Chen, Alan (McMaster University) en
dc.degree.level Doctor of Philosophy (Ph.D.) en
dc.description.note October 2009 en

Files in this item

This item appears in the following Collection(s)

Show simple item record

View Statistics