English

Asymptotic normalization coefficients of alpha-particle removal from $^{16}$O($3^-,2^+,1^-$)

Nuclear Theory 2023-04-11 v2 Solar and Stellar Astrophysics Nuclear Experiment

Abstract

Asymptotic normalization coefficients (ANC) determine the overall normalization of cross sections of peripheral radiative capture reactions. In a recent paper [Blokhintsev et al., Eur. Phys. J. A 58, 257 (2022)], we considered the ANC C0C_0 for the virtual decay 16^{16}O(0+;6.05(0^+; 6.05 MeV)α+12\to \alpha+^{12}C(g.s.). In the present paper, which can be regarded as a continuation of the previous, we treat the ANCs ClC_l for the vertices 16^{16}O(Jπ)α+12(J^\pi)\to \alpha+^{12}C(g.s.) corresponding to the other three bound excited states of 16^{16}O (Jπ=3J^\pi=3^-, 2+2^+, 11^-, l=Jl=J). ANCs ClC_l (l=3,2,1l=3,\,2,\,1) are found by analytic continuation in energy of the α12\alpha^{12}C ll-wave partial scattering amplitudes, known from the phase-shift analysis of experimental data, to the pole corresponding to the 16^{16}O bound state and lying in the unphysical region of negative energies. To determine ClC_l, the scattering data are approximated by the sum of polynomials in energy in the physical region and then extrapolated to the pole. For a more reliable determination of the ANCs, various forms of functions expressed in terms of phase shifts were used in analytical approximation and subsequent extrapolation.

Keywords

Cite

@article{arxiv.2304.02821,
  title  = {Asymptotic normalization coefficients of alpha-particle removal from $^{16}$O($3^-,2^+,1^-$)},
  author = {L. D. Blokhintsev and A. S. Kadyrov and A. M. Mukhamedzhanov and D. A. Savin},
  journal= {arXiv preprint arXiv:2304.02821},
  year   = {2023}
}

Comments

arXiv admin note: substantial text overlap with arXiv:2208.09587