TX 75237.Permanent address: Los Alamos National Laboratory, Los Alamos, NM 87545. Present address: EGRzG/EM, 130 Robin Hill Rd. , Goleta, CA 93116. for pion energies between 150 and 300 MeV. The energy dependences of the absorption cross sections for energies above 315 MeV for heavy nuclei are unknown.Early models of pion absorption emphasized quasi-
Spin-flip probabilities have been measured for inelastic proton scattering from "^^Ca at 319 MeV at angles between 3° and 12° and excitation energies up to about 40 MeV. These data can be directly related to the relative [(spin transfer)/(no spin transfer)] nuclear response via one model-dependent variable. Nuclear spin excitations appear relatively suppressed at low excitation energies but surprisingly enhanced at the highest excitation energies at intermediate angles. Many features of the data can be explained with a slab nuclear response with random-phase-approximation correlations. PACS numbers; 25.40.Ep, 27.40.+Z
Cross sections have been measured for proton emission following r+ absorption on Li, C, Al, Ni, Sn, Pb, and Q for pion kinetic energies of 50, 100, 150, and 200 MeV by using a large-solid-angle bismuth germanate detector array. An increasing fraction of transitions to states of large missing energy and with particles other than protons is observed as the energy and mass increase. PACS numbers: 25.80.Ls Despite much study [1], pion absorption is still not well understood in detail, even in light nuclei. Most studies of
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