Nuclear Seminar

New measurements of r-process nuclei

Matt Quinn
University of Notre Dame

Monday, January 28, 2008   4:00 p.m.   NSH 124
(Refreshments served prior to seminar in NSH 124)

The r-process is responsible for the creation of roughly half of the elements heavier than Iron.  Because nuclei very far from stability are involved, many of the relevant nuclear and astrophysical properties are not well known. Critical inputs for r-process models include the beta-decay half-lives and the beta-delayed neutron emission ratios (Pn). At the NSCL coupled cyclotron facility it has been possible to produce small quantities of certain r-process nuclei. We have measured half-life and neutron-emission values of isotopes in the As-Br region of the periodic table. I will outline the experimental procedure used and present preliminary results.