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Asymptotic normalization coefficients and continuum coupling in mirror nuclei

Abstract : Background: An asymptotic normalization coefficient (ANC) characterizes the asymptotic form of a one-nucleon overlap integral required for description of nucleon-removal reactions. Purpose: We investigate the impact of the particle continuum on proton and neutron ANCs for mirror systems from $p$- and $sd$-shell regions. Method: We use the real-energy and complex-energy continuum shell model approaches. Results: We studied the general structure of the single-particle ANCs as a function of the binding energy and orbital angular momentum. We computed ANCs in mirror nuclei for different physical situations, including capture reactions to weakly-bound and unbound states. Conclusions: We demonstrated that the single-particle ANCs exhibit generic behavior that is different for charged and neutral particles. We verified the previously proposed relation [N.K. Timofeyuk, R.C. Johnson, and A.M. Mukhamedzhanov, Phys. Rev. Lett. 91, 232501 (2003); Phys. Rev. Lett. 97, 069904(E) (2006); N. K. Timofeyuk and P. Descouvemont, Phys. Rev. C 72, 064324 (2005)] between proton and neutron mirror ANCs. We find minor modifications if the spectroscopic strength is either localized in a single state or broadly distributed. For cases when several states couple strongly to the decay channel, these modifications may reach 30%.
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Contributor : Michel Lion <>
Submitted on : Tuesday, March 20, 2012 - 9:03:35 AM
Last modification on : Thursday, February 1, 2018 - 1:25:44 AM

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J. Okołowicz, N. Michel, W. Nazarewicz, M. Ploszajczak. Asymptotic normalization coefficients and continuum coupling in mirror nuclei. Physical Review C, American Physical Society, 2012, 85, pp.064320. ⟨10.1103/PhysRevC.85.064320⟩. ⟨in2p3-00680716⟩



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