High-Resolution Studies ofFe57(d,t)Fe56at 11.7 and 14.5 MeV

Abstract

The ${\mathrm{Fe}}^{57}(d,t){\mathrm{Fe}}^{56}$ reaction was studied at deuteron energies of 11.7 and 14.5 MeV with 6-8-keV resolution. The experimental procedures used to obtain high resolution and good particle discrimination are described. Angular distributions were obtained over the range ${14}^{\circ }\le \theta \le {50}^{\circ }$, and $l$ values and spectroscopic factors were extracted from comparison with distorted-wave Born-approximation (DWBA) calculations. A number of $l=3\mathrm{}$ transitions showed $j$-dependent effects, which were used to single out the most likely $J^{\pi }$ assignments for poorly known states between 4- and 5-MeV excitation. For states below 4 MeV, good agreement was found with energy and $J^{\pi }$ assignments in the recent literature. A comparison of the ($d,t$) spectroscopic factors with recent shell-model calculations showed qualitative agreement for strong transitions, but also proved that the assumption of an inert ${\mathrm{Ca}}^{48}$ core is too restrictive for calculations of the Fe isotopes.