Formula omitted] angular correlation measurements

Abstract

Angular correlation measurements in the 180° geometry for the 46Ti(p, p′γ) reaction were used to determine spins and the γ-branching ratios for states at 2.962, 3.059, 3.168 and 3.236 MeV excitation. Gamma-ray spectra observed with a Ge(Li) spectrometer were used to obtain accurate excitation energies and served as an independent check on the branching ratios. Using the available information, these states were assigned spins and parities J π = 2 2, 3 1 −, 1 1 + and 2 3 +, respectively. The 2.96, 3.17 and 3.24 MeV states were found to decay to the ground and 2 1 + states with ground-state branchings of 4.3±0.8%, 44±3% and 20±2%, respectively. The corresponding (L+1)/L mixing ratios for transitions to the 2 1 + state give δ = −1.15 −0.5 +0.4, −0.4 −11 +0.7 and 0.0±0.1, respectively. The sign convention is that of Litherland and Ferguson. The 3 1 − state was found to have a 90±3% branch ( δ = 0.0±0.1) to the 4 1 + state, a possible branch of ≦ 3% to the 2 1 + state, and indirect evidence was found for an unusual 10±3% branch to the 2 2 + state. The reduced E1 transition rates for the 3 1 − state show a highly preferred decay to the 2 2 + state, which is in a qualitative agreement with the calculations of Soga.