Single-nucleon transfer reactions on18F

Abstract

Simultaneous measurement of the proton-transfer ${}^{18}\mathrm{F}{(d,\phantom{\rule{-0.16em}{0ex}}n)}^{19}\mathrm{Ne}$ and neutron-transfer ${}^{18}\mathrm{F}{(d,\phantom{\rule{-0.16em}{0ex}}p)}^{19}\mathrm{F}$ reactions were performed with a ${}^{18}\mathrm{F}$ radioactive beam at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The experiments clarify the nuclear structure of ${}^{19}\mathrm{Ne}$ near the proton threshold, which is relevant for understanding the rates of proton-induced reactions on ${}^{18}\mathrm{F}$ in novae. Analogs for several states in the mirror nucleus ${}^{19}\mathrm{F}$ have not yet been identified in ${}^{19}\mathrm{Ne}$, indicating that the level structure of ${}^{19}\mathrm{Ne}$ in this region is incomplete. We observed 15 levels in ${}^{19}\mathrm{Ne}$ from the ${}^{18}\mathrm{F}{(d,\phantom{\rule{-0.16em}{0ex}}n)}^{19}\mathrm{Ne}$ measurement and 18 levels in ${}^{19}\mathrm{F}$ from the ${}^{18}\mathrm{F}{(d,\phantom{\rule{-0.16em}{0ex}}p)}^{19}\mathrm{F}$ measurement. Angular distributions were extracted for all strongly populated states and compared to distorted-wave Born approximation calculations. The angular distributions for all the known states in the two nuclei determined in this work are consistent with their previously assigned spins and parities. The spectroscopic factors determined for these levels in the two nuclei are reported.