Mass Measurements of Neutron-rich Nuclei Influential to r-Process Abundances
Sabrina Strauss, University of Notre Dame
The synthesis of heavy elements (Z > 26) cannot proceed through fusion in stars due to energy consumption. Above Z > 26, neutron processes both rapid (r-) and slow (s-) are responsible for the creation of heavy elements. The r-process takes place far away from stability with a series of successive neutron captures and beta decays. The abundances of the resulting heavy elements from the r-process are dependent on nuclear masses, half-lives, and neutron capture rates.
Using several different mass model programs, influential isotopes with poorly known nuclear masses were identified in a recent publication. We have used this study to propose a set of measurements at Argonne National Laboratory using the Canadian Penning Trap (CPT). Several of these nuclei (23) are produced in fission at a rate of 10^-5 for every 100 Californium nuclei, pushing the limits of what is currently experimentally possible. The detector and analysis techniques used at the CPT will be presented.
Brett et al., Eur. Phys. Jour. A, 12184-4 (2012).
Abstract Author(s): S.Y. Strauss, N. Paul, A. Nystrom, K. Seigl, S.T. Marley, M. Mumpower, R. Surman, and A. Aprahamian, ND; J.A. Clark, G. Savard, S. Caldwell, A. Perez Galvan, J. Van Schelt, and M. Sternberg, ANL; K. Sharma and G. Morgan, Manitoba; F. Buchinger and R. Orford, McGill; J. Fallis, TRIUMF