Probing exotic cross-shell interactions at N=28 with single-neutron transfer on 47K
nucl-ex
/ Authors
C. J. Paxman, A. Matta, W. N. Catford, G. Lotay, M. Assié, E. Clément, A. Lemasson, D. Ramos, N. A. Orr, F. Galtarossa
and 69 more authors
V. Girard-Alcindor, J. Dudouet, N. L. Achouri, D. Ackermann, D. Barrientos, D. Beaumel, P. Bednarczyk, G. Benzoni, A. Bracco, L. Canete, B. Cederwall, M. Ciemala, P. Delahaye, D. T. Doherty, C. Domingo-Pardo, B. Fernández-Domínguez, D. Fernández, F. Flavigny, C. Fougères, G. de France, S. Franchoo, A. Gadea, J. Gibelin
/ Abstract
We present the first measurement of the $^{47}$K($d,pγ$)$^{48}$K transfer reaction, performed in inverse kinematics using a reaccelerated beam of $^{47}$K. The level scheme of $^{48}$K has been greatly extended with nine new bound excited states identified and spectroscopic factors deduced. Detailed comparisons with SDPF-U and SDPF-MU shell-model calculations reveal a number of discrepancies with these results, and a preference for SDPF-MU is found. Intriguingly, an apparent systematic overestimation of spectroscopic factors and a poor reproduction of the energies for 1$^-$ states suggests that the mixing between the $πs^{\,\,\,1}_{1/2} d^{\,\,\,4}_{3/2}$ and $πs^{\,\,\,2}_{1/2} d^{\,\,\,3}_{3/2}$ proton configurations in $^{48}$K is not correctly described using current interactions, challenging our descriptions of light $N=28$ nuclei.