Gamow-teller strength in the O18(p,n)F18 reaction at 135 MeV

B. D. Anderson; A. Fazely; R. J. McCarthy; P. C. Tandy; J. W. Watson; R. Madey; W. Bertozzi; T. N. Buti; J. M. Finn; J. Kelly; M. A. Kovash; B. Pugh; B. H. Wildenthal; C. C. Foster

doi:10.1103/PhysRevC.27.1387

Gamow-teller strength in the O18(p,n)F18 reaction at 135 MeV

B. D. Anderson, A. Fazely, R. J. McCarthy, P. C. Tandy, J. W. Watson, R. Madey, W. Bertozzi, T. N. Buti, J. M. Finn, J. Kelly, M. A. Kovash, B. Pugh, B. H. Wildenthal, C. C. Foster

Physics And Astronomy

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Abstract

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.

Original language	English
Pages (from-to)	1387-1393
Number of pages	7
Journal	Physical Review C - Nuclear Physics
Volume	27
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.27.1387
State	Published - 1983

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Nuclear and High Energy Physics

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10.1103/PhysRevC.27.1387

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@article{f2a633678a6b47bf85fd04516e1f5bed,

title = "Gamow-teller strength in the O18(p,n)F18 reaction at 135 MeV",

abstract = "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.",

author = "Anderson, {B. D.} and A. Fazely and McCarthy, {R. J.} and Tandy, {P. C.} and Watson, {J. W.} and R. Madey and W. Bertozzi and Buti, {T. N.} and Finn, {J. M.} and J. Kelly and Kovash, {M. A.} and B. Pugh and Wildenthal, {B. H.} and Foster, {C. C.}",

year = "1983",

doi = "10.1103/PhysRevC.27.1387",

language = "English",

volume = "27",

pages = "1387--1393",

number = "4",

}

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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DO - 10.1103/PhysRevC.27.1387

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IS - 4

ER -

Gamow-teller strength in the O18(p,n)F18 reaction at 135 MeV

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