Mass measurements of proton-rich nuclides in the vicinity of 92Ru and 93Rh for νp-process models

J. Fallis, University of Manitoba
J. A. Clark, Argonne National Laboratory
K. S. Sharma, University of Manitoba
G. Savard, Argonne National Laboratory
F. Buchinger, Université McGill
S. Caldwell, Argonne National Laboratory
J. E. Crawford, Université McGill
C. M. Deibel, Yale University
J. L. Fisker, Lawrence Livermore National Laboratory
S. Gulick, Université McGill
A. A. Hecht, University of Wisconsin-Madison
D. Lascar, Argonne National Laboratory
J. K.P. Lee, Université McGill
A. F. Levand, Argonne National Laboratory
G. Li, Argonne National Laboratory
A. Parikh, Technical University of Munich
N. D. Scielzo, Lawrence Livermore National Laboratory
R. Segel, University of Wisconsin-Madison
H. Sharma, Banaras Hindu University
M. Sternberg, Argonne National Laboratory
T. Sun, Argonne National Laboratory
J. Van Schelt, Argonne National Laboratory
C. Wrede, Yale University


One of the long-standing questions in our understanding of the origin of the elements is the significant underproduction of light-p nuclei such as 92Mo and 94Mo by models of nucleosynthesis in various astrophysical scenarios. The recently proposed νp-process [1], which occurs due to the interaction of the neutrino wind with the proton-rich ejecta of core collapse supernova explosions, is a process which could resolve the underproduction of 92Mo and 94Mo. The final abundances of these two isotopes as well as any others synthesized by the νp-process depend directly on the values of the proton separation energies, Sp, along the νp-process reaction path; the Sp value of 93Rh is thought to be especially critical to the relative production of 92Mo and 94Mo [2]. Due to the absence of mass measurements in this region Sp(93Rh) and many of the other required Sp values were not well known. Recent mass measurements performed with the Canadian Penning Trap mass spectrometer have reduced uncertainties in the Sp values of many of the proton-rich nuclei between Mo and Pd including S p(93Rh) by factors of as much as 60. These measurements and the resulting implications for both the ∪-process path and the 92Mo/94Mo abundance ratio will be discussed. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlikeLicence.