TY - JOUR
T1 - Gamow-teller strength in the O18(p,n)F18 reaction at 135 MeV
AU - Anderson, B. D.
AU - Fazely, A.
AU - McCarthy, R. J.
AU - Tandy, P. C.
AU - Watson, J. W.
AU - Madey, R.
AU - Bertozzi, W.
AU - Buti, T. N.
AU - Finn, J. M.
AU - Kelly, J.
AU - Kovash, M. A.
AU - Pugh, B.
AU - Wildenthal, B. H.
AU - Foster, C. C.
PY - 1983
Y1 - 1983
N2 - The distribution of Gamow-Teller strength in the O18(p,n)F18 reaction was studied at a bombarding energy of 135 MeV. Five 1+, T=0 states are identified below Ex=7 MeV and a concentration of 1+ states of presumed T=1 character is observed between Ex=9.5 and 12 MeV. Approximately 82% of the 1+ strength is concentrated into the ground-state transition and only 5.5% is seen in the T=1 component. Normalization of the ground-state transition to the known Gamow-Teller matrix element from the analogous beta decay of Ne18 allows the (p,n) cross sections to be related to the Gamow-Teller strength. The resulting total Gamow-Teller strength observed in the (p,n) reaction is about two-thirds of the minimum value required by the sum rule for a T=1 nucleus. This result is in reasonable agreement with the total Gamow-Teller strength predicted from a shell-model calculation which uses empirically renormalized single-particle Gamow-Teller matrix elements. The concentration of the T=0 strength predominantly into the ground state and the observed ratio of T=1 to T=0 strength also are consistent with these calculations. NUCLEAR REACTIONS O18(p,n)F18, E=135 MeV; neutron spectra measured in 3°steps between 0°and 69°; angular distributions extracted for separate transitions. Strengths of forward-peaked transitions compared with shell-model predictions of Gamow-Teller strength.
AB - The distribution of Gamow-Teller strength in the O18(p,n)F18 reaction was studied at a bombarding energy of 135 MeV. Five 1+, T=0 states are identified below Ex=7 MeV and a concentration of 1+ states of presumed T=1 character is observed between Ex=9.5 and 12 MeV. Approximately 82% of the 1+ strength is concentrated into the ground-state transition and only 5.5% is seen in the T=1 component. Normalization of the ground-state transition to the known Gamow-Teller matrix element from the analogous beta decay of Ne18 allows the (p,n) cross sections to be related to the Gamow-Teller strength. The resulting total Gamow-Teller strength observed in the (p,n) reaction is about two-thirds of the minimum value required by the sum rule for a T=1 nucleus. This result is in reasonable agreement with the total Gamow-Teller strength predicted from a shell-model calculation which uses empirically renormalized single-particle Gamow-Teller matrix elements. The concentration of the T=0 strength predominantly into the ground state and the observed ratio of T=1 to T=0 strength also are consistent with these calculations. NUCLEAR REACTIONS O18(p,n)F18, E=135 MeV; neutron spectra measured in 3°steps between 0°and 69°; angular distributions extracted for separate transitions. Strengths of forward-peaked transitions compared with shell-model predictions of Gamow-Teller strength.
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U2 - 10.1103/PhysRevC.27.1387
DO - 10.1103/PhysRevC.27.1387
M3 - Article
AN - SCOPUS:4243506640
SN - 0556-2813
VL - 27
SP - 1387
EP - 1393
JO - Physical Review C - Nuclear Physics
JF - Physical Review C - Nuclear Physics
IS - 4
ER -