Spectroscopy ofSm146via the (d, t) and ofSm148via the (d, t) and (d, p) reactions

Abstract

The ($d, t$) reaction on the isotopes $^{147}\mathrm{Sm}$ and $^{149}\mathrm{Sm}$ has been investigated at a deuteron energy of 17 MeV; the ($d, p$) reaction on the isotope $^{147}\mathrm{Sm}$ at a deuteron energy of 12.5 MeV. Angular distributions were taken in 2.5\ifmmode^\circ\else\textdegree\fi{} steps in the range of $7.5\ensuremath{\le}{\ensuremath{\theta}}_{\mathrm{lab}}\ensuremath{\le}35\ifmmode^\circ\else\textdegree\fi{}$ and in 5\ifmmode^\circ\else\textdegree\fi{} steps for ${\ensuremath{\theta}}_{\mathrm{lab}}>35\ifmmode^\circ\else\textdegree\fi{}$. The experimental energy resolution is 9-11 keV for the pickup reactions and 10-12 keV for the stripping case. Spectroscopic factors and $l$ transfers were extracted by distorted wave Born approximation analysis. Eighty-three states in $^{146}\mathrm{Sm}$ are observed; $l$ transfer and ${J}^{\ensuremath{\pi}}$ limits are given for 36 of them. For the nucleus $^{148}\mathrm{Sm}$ 97 states are observed; $l$ transfers and ${J}^{\ensuremath{\pi}}$ limits are given for 63 of them. Reasonable $l=3$, $l=1$, and $l=0$ summed strengths have been found. Comparison with ($p, t$) and ($t, p$) studies of the same final nuclei investigated here is made in a phenomenological collective picture.NUCLEAR REACTIONS $^{147}\mathrm{Sm}(d, t)$ and $^{149}\mathrm{Sm}(d, t)$, ${E}_{d}=17$ MeV. $^{147}\mathrm{Sm}(d, p)$, ${E}_{d}=12.5$ MeV. Measured $\ensuremath{\sigma}({E}_{t}, \ensuremath{\theta})$, $\ensuremath{\sigma}({E}_{p}, \ensuremath{\theta})$; $^{146,148}\mathrm{Sm}$ level energies, resolution 9-12 keV, enriched targets, DWBA analysis.