Survey of Excited State Neutron Spectroscopic Factors forZ=8–28Nuclei

Abstract

We have extracted 565 neutron spectroscopic factors of sd and fp shell nuclei by systematically analyzing more than 2000 measured (d,p) angular distributions. We are able to compare 125 of the extracted spectroscopic factors to values predicted by largebasis shell-model calculations and evaluate the accuracies of spectroscopic factors predicted by different shell-model interactions in these regions. We find that the spectroscopic factors predicted for most excited states of sd-shell nuclei using the latest USDB or USDA interactions agree with the experimental values. For fp shell nuclei, the inability of the current models to account for the core excitation and fragmentation of the states leads to considerable discrepancies. In particular, the agreement between data and shell-model predictions for Ni isotopes is not better than a factor of two using either the GXPF1A or the XT interaction.

Neutron-hole states in45Ar from1H(46Ar, Lu1, Lee2, Tsang3 et al. 2013Phys. Rev. CSelf Cite

“…Due to mixing of the p 3/2 orbit outside the f 7/2 orbit in the N=28 core, shell model predictions of the excited states in pf-shell nuclei are less reliable. For example, predictions of the neutron spectroscopic factors (SF) for the excited states of Ni isotopes are not better than a factor of two [8,9]. Our previous systematic studies of the neutron spectroscopic factors of the excited states mainly use particle-states [8,9] from (d,p) transfer reactions.…”

Spectroscopic factors for low-lyingN16levels and the astrophysicalN15(Li1, Li2, Su3 et al. 2014Phys. Rev. C21070View full textAdd to dashboardCite

“…The parameters of the core-core ( 6 Li + 15 N) potential were obtained using the present ones of 6 Li + 15 N at 34.5 MeV and systematics in energy dependence of the potential parameters [27]. For the bound state 16 N = 15 N + n, the standard geometrical parameters r = 1.25 fm and a = 0.65 fm were adopted, which have been extensively utilized to study the ground state neutron spectroscopic factors for 80 nuclei of Z = 3-24 [31] and 565 excited state neutron spectroscopic factors for Z = 8-28 nuclei [32]. All the parameters used in the calculation are listed in Table I.…”

Proton widths of the low-lying16Fstates from the15N(7Li,Wu1, Li2, Li3 et al. 2014Phys. Rev. C9010View full textAdd to dashboardCite

“…[26]. For the wave function of bound states, the Woods-Saxon potential with the standard geometric parameters (r = 1.25 fm and a = 0.65 fm) was adopted, which have been extensively utilized to study the ground state neutron spectroscopic factors for 80 nuclei of Z = 3-24 [29] and 565 excited state neutron spectroscopic factors for Z = 8-28 nuclei [30]. The potential depths were adjusted to reproduce the neutron binding energies.…”