Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., May 20, 2004, at 3:00 p.m.

Xtreme Xperiments: Fun with Neutrons, Gamma-rays, and Radioactive Beams

James J. Kolata, Notre Dame University
6008 Conference Room

Neutron coincidence experiments using radioactive beams, though difficult, hold great promise for resolving important issues regarding the structure and reactions of exotic nuclei. Two recent case studies from experiments using the TwinSol facility at the University of Notre Dame will be discussed. The first involves the measurement of neutron energies and angular distributions in coincidence with alpha particles resulting from transfer/breakup of 6He on a 209Bi target near the Coulomb barrier. The aim was to identify the reaction mechanisms that account for the previously observed very large transfer/breakup yields in this system. In the second experiment, coincidences between neutrons and gamma rays following the 6He(p,n) reaction were used to study the structure of 7He via population of analog states in 7Li. The result has relevance for recent claims of strong modification of the spin-orbit force in very neutron rich light nuclei.