The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.

The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.

The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.

Break-out from the hot-CNO cycle studied with radioactive beams

CAPPUZZELLO, FRANCESCO;CHERUBINI, SILVIO;MUSUMARRA, Agatino;
2002-01-01

Abstract

The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.
The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.
The 15O(alpha, gamma)(19)Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance at E(c.m). = 504 keV which corresponds to a (19)Ne excitation energy of E(R) = 4.033 MeV. It is possible to model the (15)O(alpha,gamma)(19)Ne reaction rate, if the branching ratio Gamma(alpha)/Gamma and the total resonance width F of this state are known. Results from an exploratory (18)Ne(d, P) experiment performed in inverse kinematics at E(lab) = 44.1 MeV and 10(6) pps beam intensity show that the 4.033 MeV state-among other resonances of astrophysical interest-is populated in this reaction (dsigma/dOmega = 0.5 +/- 0.2 mb/sr at theta(lab) = 138degrees). The determination of Gamma(alpha)/Gamma = 0.28 +/- 0.13 for another (19)Ne resonance at E(R) = 4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available. (C) 2002 Elsevier Science B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/14858
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