D. Marchlenski

Cross section and analyzing power for quasifree (p, n) reactions

Abstract Cross sections and analyzing powers have been measured for 12C(p, n) at 494 MeV and 795 MeV and for Pb(p, n) at 795 MeV. The data span an energy loss range of at least 200 MeV, vhich is sufficient to clearly reveal the large peak associated with quasifree neutron knockout. The kinematics, cross section and analyzing power for this peak are compared to the corresponding observables for free nucleon-nucleon scattering and to the observables calculated with a relativistic Fermi-gas model.

Spin transfer measurements in the quasifree (p↘,n↘) reactions at 500 MeV

Complete sets of polarization transfer observables in the quasifree (p↘,n↘) reactions have been measured for the first time. Experiments were performed using the newly calibrated neutron polarimeter and newly developed Neutron Time‐of‐Flight Facility (NTOF) at LAMPF. Measurements were made at 18° and over a broad excitation energy range. The resulting energy‐loss spectra of the spin‐longitudinal and spin‐transverse response functions are presented and discussed for Ca, C, and 2H at 500 MeV, and for a momentum transfer of 350 MeV/c.

Measurement of spin observables in quasielastic scattering of polarized protons from polarized 3He

Measurements of analyzing powers and spin correlation parameters for 3He(p↘,2p) and 3H↘e(p↘,pn) quasielastic scattering have been carried out using a polarized internal 3He target and a stored, polarized proton beam. They were made over a wide kinematic range with a proton energy of 197 MeV and a large acceptance detector system which allowed the simultaneous measurement of both reactions. At momentum transfers sufficiently high to minimize rescattering effects, the (p,pn) results are in agreement with PWIA calculations. The (p,2p) results were found to be less sensitive to kinematic conditions and are also in agreement with calculations.