Spin decomposition of the responses of Ca44 and Ca48 to 300 MeV protons

Angular distributions of the double-differential cross section d2-sigma/d-OMEGA-dE(sigma) and the spin-flip probability S(nn) have been measured for inclusive proton inelastic scattering from Ca-44 at 290 MeV and from 48Ca at 318 MeV. Excitation energies up to about 50 MeV for Ca-44 and 40 MeV for 48Ca have been investigated over the laboratory angular ranges of 3-degrees to 12-degrees for Ca-44 and 3-degrees to 9-degrees for 48Ca. Multipole decompositions of angular distributions of both the spin-flip cross section sigma-S(nn) and the estimated cross section for DELTA-S = 0 transitions have been performed. Distributions of strengths were deduced for DELTA-L = 1, DELTA-S = 0 (the giant dipole), DELTA-L = 2, DELTA-S = 0 (the giant quadrupole), DELTA-L = 0, DELTA-S = 1 (the magnetic dipole), DELTA-L = 1, DELTA-S = 1 (the spin dipole), and DELTA-L = 2, DELTA-S = 1 (the spin quadrupole). The DELTA-S = 0 summed strengths for Ca-44 are lower than for Ca-40 and 48Ca. The spin-dipole summed strengths are found to be approximately independent of A. For 48Ca, essentially all M1 strength observed was in the 10.23 MeV 1+ state; for Ca-44, M1 strength was observed to be fragmented over a range of 7 to 18 Mev.