Physics – Nuclear Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dnp.ga002c&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, 27-30 October, 2004, Chicago, IL. MEETING ID: DNP04., abstract #
Physics
Nuclear Physics
Scientific paper
An x-ray burst is one possible site for the astrophysical rp-process which involves the accretion of hydrogen and helium from a binary companion onto the surface of a neutron star. Mass measurements of the nuclides involved with uncertainties less than 100 keV are required as key inputs to network calculations used to describe the rp-process in terms of the abundances of the nuclides produced, the light-curve profile of the x-ray bursts, and the energy released. The masses of `waiting-point' nuclides along the rp-process path are particularly important, since they cause the process to stall until these nuclides subsequently β decay. This paper will discuss the precise mass measurements made of isotopes along the rp-process path using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. The measurements have concentrated on isotopes which could have the most influence on models of the path. These include the masses of the waiting-point nuclides ^68Se and ^64Ge, masses near the proposed termination region of the path, and masses of refractory isotopes along the path for which no empirical mass information exists. This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. W-31-109-ENG-38, and by NSERC of Canada.
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