Medium energy gamma rays following radiative capture of 50 MeV polarized protons onB11

Giant Resonances in Excited Nuclei

“…Measurements of IlB(1', y)1 2 C* at higher bombarding energies (42,44,52) show that the sign aJ}d angular dependence of the analyzing power for population of the E� � 1 9 MeV complex is similar to that of Yo, while for E� � 22 MeV the opposite-sign analyzing power is fo und, similar to that of y I . This shows that the particle config urations are mostly of the form j = l+ 1/2 fo r E� � 1 9 MeV and j = 1-1 /2 for E� � 22 MeV, in accord with the simple shell-model expectation that the former states are mostly (lds/2)I(lP 3 /2)-1 and the latter (ld 3 /2)I(lP 3 /2)-I .…”

“…Since 1979 or so, medium-energy Ep � 20-80 MeV (p, y) experiments in light nuclei with mass 12 S; A S; 41 have provided qualitatively new infor mation (35)(36)(37)(38)(39)(40)(41)(42)(43)(44) on the properties of GDRs built on a variety of different states within the same nucleus, extending up to relatively high fi nal-state energy E� � 20 MeV and higher. These studies have added greatly to our understanding of the systematics of GDRs in excited nuclei, and of the general nature of the (p, y) reaction.…”