γRays Following Thermal Neutron Capture in Titanium

Abstract

The $\gamma$ rays following thermal neutron capture in titanium have been studied with two high resolution spectrometers and with an angular correlation arrangement using two sodium iodide scintillation spectrometers. The high resolution instruments were a pair spectrometer for the energy range 2.8 to 11.0 Mev and a double flat crystal diffraction spectrometer for the energy range 0.14 to 5 Mev. A total of 54 $\gamma$ rays were observed, 25 of which had not previously been resolved. A decay scheme for ${\mathrm{Ti}}^{49}$ is given with energy levels at 1.378±0.001, 1.583±0.001, 1.719±0.001, 3.172±0.002, and 3.261±0.005 Mev. The neutron binding energy of ${\mathrm{Ti}}^{49}$ is concluded to be 8.132±0.006 Mev. Angular correlation measurements were made between some of the prominent $\gamma$ rays emitted in the decay of ${\mathrm{Ti}}^{49}$. The measurements confirm that the spins of the 1.378 and 1.719 Mev levels are $\frac{3}{2}$ and ½, respectively.