Physics – Condensed Matter – Superconductivity
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........31h&link_type=abstract
PhD Dissertation, Ohio State Univ. Columbus, OH United States
Physics
Condensed Matter
Superconductivity
Nuclear Fusion, Hydrogen, Erosive Burning, Molybdenum Isotopes, Abundance, Neutron Stars, Mass Spectra, Astrophysics, Reaction Products, Protons, Capture Effect, Cyclotrons, Separators, Superconductivity, Preprocessing, Cadmium Isotopes, Gold Isotopes, Ruthenium Isotopes, Rhodium Isotopes, Palladium Isotopes
Scientific paper
Since both Mo-92 and Mo-94 lie on the proton-rich side of the valley of stability, their abundances can be explained by neither the s-process nor the r-process. In addition, their abundances have been left unaccounted for by previous theories involving the p-process. this work explores the possibility of creating Mo-92 and Mo-94 through a rapid proton capture process. It is shown that for temperatures from 0.95 x 109 K to 1.4 x 109 K, significant abundances of these nuclides can be built up. For solar seeds and a proton mass density of 104 g/cu cm, the overproduction factors of these nuclei may be or order 70, but considerably larger overproduction could be anticipated as a result of preprocessing. Accreting neutron stars and Thorne-Zytkow objects are suggested as possible sites for the process. the results are found to be critically dependent on the decay modes and masses of nuclei at the proton drip line. In particular, knowledge concerning the actual location of the drip line is vital. Unfortunately, experimental evidence concerning very proton rich nuclei in the A = 80 to 95 range is rare. In order to determine which proton rich nuclei in this mass range are proton bound, we analyzed the reaction products of an E/A = 60 MeV Cd-106 beam using the A1200 projectile fragment separator at the National Superconducting Cyclotron Laboratory. Nine new very neutron-deficient isotopes of Ag, Pd, Rh, and Ru have been identified among them. One of these isotopes, Ag-94, is the heaviest observed N + Z nucleus. The resulting mass spectra are presented and the astrophysical implications of some of the new isotopes are discussed.
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