Inverse-kinematics proton scattering from $^{42,44}$S, $^{41,43}$P
ORAL
Abstract
Excited states of $^{42,44}$S and $^{41,43}$P have been studied via inverse-kinematics proton scattering from a liquid hydrogen target, using the GRETINA $\gamma$-ray tracking array. Proton-scattering deformation lengths of the $2^+_1$ excitations in $^{42,44}$S have been combined with electromagnetic deformation lengths to yield the ratio of neutron-to-proton matrix elements $M_n/M_p$. The status of the $N=28$ major shell gap approaching $^{42}$Si is discussed in light of the systematic behavior of $M_n/M_p$ in even-even nuclei, and the $^{41,43}$P$(p,p')$ results are used to compare the SDPF-U and SDPF-MU shell-model interactions.
*This work was supported by the NSF under Grant PHY-1617250, PHY-1064819, PHY-1565546, and 1401574, and by the DOE under Grant DE-SC0009883. GRETINA was funded by the DOE Office of Science. Operation at NSCL was supported by the DOE under Grant DE-SC0014537 (NSCL) and DE-AC02-05CH11231 (LBNL).
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