Energy levels below 2 Mev in ' 'Sb and "'Sb have been studied using the ' '" Sb(n, n'y) and ' Sn(p, y) reactions. y-ray angular distributions have been measured and spins and y-ray multipole mixing ratios deduced. Spin assignments have been made for the 1025 (7/2), 1036 (9/2), and 1145 (9/2) keV levels in "'Sb, and an assignment of 9/2 is suggested for the 1030 keV level in '"Sb. Present and previous results are discussed in the framework of an intermediate coupling model. NUCLEAR REACTIONS ' Sb(n, e' p}, &= 1.5-2.7 Mev; measured E&, 0 (E&, g ) branching ratios-121.123Sb deduced levels, J 4' natural targets. 1 Sn(P y}, & = 3.4 Mev; measured &&, enriched target. Intermediate coupling model calculations.
The excited states of '"Pb were studied using the ' 'Pb(n, n'y) reaction. Gamma-ray excitation functions and angular distributions were recorded using a small-sample technique. Previously unreported '"Pb levels were observed at 1605 + 1, 1682 + 1, 1762 + 1, 1873 + 1, and 2276 + 3 keV excitation. The spins of the levels at 1682, 1762, 1873, and 2276 keV are J = 1, 2, or 3 . The spin and parity of the 1605 keV level is limited to J = 3+ or 4+.Multipole mixing ratios were measured for several transitions where the initial and final state spins and parities were firmly established from previous work.
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