Faculty
Postdocs
Students
Collaborators

Research

Isomers
Pygmy Dipole States
KamLAND
Previous
Publications

Equipment

Polarized 3He Target

Links

UNC Physics
TUNL
HIGS

Proton-3He Scattering

To broaden the scope of the search for three-nucleon force effects and to look for their effects in a different system, we have begun a series of measurements of cross sections and analyzing powers at energies below 4 MeV of proton-3He elastic scattering. Theoretical techniques have advanced to the point where calculations of these observables in the p-3He system are now possible. It is thought that three-nucleon force effects will be larger due to the tighter binding of 3He which keeps the three nucleons in closer together than in the deuteron. This closer proximity could result in larger analyzing power (and perhaps even cross section) discrepancies from predictions using the standard two- and three-nucleon potentials. These experiments will provide a stringent test of present theoretical calculations. Accurate wavefunctions from such calculations are also of great interest in calculations of the astrophysically significant reaction p + 3He → 4He + e+ + νe. This reaction is the source of the highest energy neutrinos from the Sun.