Reconciling Coulomb breakup and neutron radiative capture

Reconciling Coulomb breakup and neutron radiative capture The Coulomb-breakup method to extract the cross section for neutron radiative capture at astrophysical energies is analyzed in detail. In particular, its sensitivity to the description of the neutron-core continuum is ascertained. We consider the case of C14(n,γ)C15 for which both the radiative capture at low energy and the Coulomb breakup of C15 into C14+n on Pb at 68 MeV/nucleon have been measured with accuracy. We confirm the direct proportionality of the cross section for both reactions to the square of the asymptotic normalization constant of C15 observed by Summers and Nunes [Phys. Rev. C 78, 011601(R) (2008)10.1103/PhysRevC.78.011601], but we also show that the C14-n continuum plays a significant role in the calculations. Fortunately, the method proposed by Summers and Nunes can be improved to absorb that continuum dependence. We show that a more precise radiative-capture cross section can be extracted selecting the breakup data at forward angles and low C14-n relative energies. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Reconciling Coulomb breakup and neutron radiative capture

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Reconciling Coulomb breakup and neutron radiative capture

Abstract

The Coulomb-breakup method to extract the cross section for neutron radiative capture at astrophysical energies is analyzed in detail. In particular, its sensitivity to the description of the neutron-core continuum is ascertained. We consider the case of C14(n,γ)C15 for which both the radiative capture at low energy and the Coulomb breakup of C15 into C14+n on Pb at 68 MeV/nucleon have been measured with accuracy. We confirm the direct proportionality of the cross section for both reactions to the square of the asymptotic normalization constant of C15 observed by Summers and Nunes [Phys. Rev. C 78, 011601(R) (2008)10.1103/PhysRevC.78.011601], but we also show that the C14-n continuum plays a significant role in the calculations. Fortunately, the method proposed by Summers and Nunes can be improved to absorb that continuum dependence. We show that a more precise radiative-capture cross section can be extracted selecting the breakup data at forward angles and low C14-n relative energies.
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Publisher
American Physical Society (APS)
Copyright
Copyright © ©2017 American Physical Society
ISSN
0556-2813
eISSN
1089-490X
D.O.I.
10.1103/PhysRevC.96.015801
Publisher site
See Article on Publisher Site

Abstract

The Coulomb-breakup method to extract the cross section for neutron radiative capture at astrophysical energies is analyzed in detail. In particular, its sensitivity to the description of the neutron-core continuum is ascertained. We consider the case of C14(n,γ)C15 for which both the radiative capture at low energy and the Coulomb breakup of C15 into C14+n on Pb at 68 MeV/nucleon have been measured with accuracy. We confirm the direct proportionality of the cross section for both reactions to the square of the asymptotic normalization constant of C15 observed by Summers and Nunes [Phys. Rev. C 78, 011601(R) (2008)10.1103/PhysRevC.78.011601], but we also show that the C14-n continuum plays a significant role in the calculations. Fortunately, the method proposed by Summers and Nunes can be improved to absorb that continuum dependence. We show that a more precise radiative-capture cross section can be extracted selecting the breakup data at forward angles and low C14-n relative energies.

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 10, 2017

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