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Electric quadrupole strength in /sup 16/O from the /sup 15/N(p-arrow-right,. gamma. /sub 0/) /sup 16/O reaction reaction

Journal Article · · Phys. Rev. C; (United States)
Angular distributions of the relative cross sections and analyzing powers have been measured for the /sup 15/N(p-arrow-right,..gamma../sub 0/)/sup 16/O reaction in approx. =500 keV steps for excitation energies in /sup 16/O between 17.8 and 24.9 MeV. All E1 and E2 transition matrix elements were determined using a partial-wave analysis. Below 22 MeV, little quadrupole strength was found in excess of that predicted in direct capture calculations. A clear enhancement of the E2 cross section was observed at energies above 22 MeV. Our data indicate that about 10% of the isoscalar E2 sum rule for /sup 16/O is exhausted in the p/sub 0/ decay channel between 18 and 25 MeV, with approximately (34 of this integrated strength concentrated between 22 and 25 MeV. The E2 strength seen in (..gamma..,p/sub 0/) is strikingly different from that observed in (..cap alpha..,..cap alpha..') or (..cap alpha..,..cap alpha..'p). The effect of the M1 state at E/sub x/ = 18.8 MeV previously found in (p,..gamma..) studies is clearly observed.
Research Organization:
Department of Physics, Stanford University, Stanford, California 94305
OSTI ID:
5186103
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 37:6; ISSN PRVCA
Country of Publication:
United States
Language:
English