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.

UR - http://www.scopus.com/inward/record.url?scp=4243506640&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243506640&partnerID=8YFLogxK

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 -