P33: Angular Correlation Studies of Excited States

Abstract

The ${}_{}{}^{31}{}_{}{}^{}\mathrm{P}(t, p){}_{}{}^{33}{}_{}{}^{}\mathrm{P}$ reaction has been used to investigate the spins and decay modes of many of the levels of ${}_{}{}^{33}{}_{}{}^{}\mathrm{P}$ below an excitation energy of 6.17 MeV, as well as the multipole mixing ratios of the transitions between these levels. $\gamma$ radiation was detected simultaneously in five NaI(Tl) detectors located at angles equivalent to 5, 35, 45, 60, and 90°, while outgoing protons were detected in an annular detector placed at 180° with respect to the beam direction. Multiparameter techniques were used to measure the $p-\gamma$ coincidence spectra. Spin assignments were confirmed for the following levels [$E_x$ (MeV) ($J$)]: $1.43\left(\frac{3}{2}\right)$, $1.85\left(\frac{5}{2}\right)$, $2.54\left(\frac{3}{2}\right)$, $3.28(\frac{3}{2} or \frac{5}{2})$, $3.63\left(\frac{7}{2}\right)$, $4.05(\frac{3}{2} or \frac{5}{2})$, $4.22\left(\frac{7}{2}\right)$. Assignments were made for these levels: $3.49\left(\frac{5}{2}\right)$, $4.19\left(\frac{5}{2}\right)$, $4.86\left(\frac{3}{2}\right)$, $5.05\left(\frac{3}{2}\right)$, $5.56\left(\frac{3}{2}\right)$, $5.66(\frac{1}{2}, \frac{3}{2})$, $5.73\left(\frac{3}{2}\right)$.