Localized l window from partial fusion reactions accompanied by proton, deuteron, and triton emission

A high and localized spin population associated with partial fusion reactions has been established through the measurement of γ-ray multiplicity in coincidence with fast forward p, d, or t produced by 167-MeV ¹⁴N on ¹⁵⁴Sm. The average γ multiplicities are constant (M_γ=31) for all the yrast transitions up to spin 26 in ¹⁵⁸Er, which implies that no spins up to 26 were populated initially. The deduced average angular momentum transferred is 63, which is comparable to the critical angular momentum lcr predicted for the fusion of ¹³C and ¹⁵⁴Sm. The mass distribution of the residual nuclei is appreciably narrower than that for compound nuclear reactions, and this gives another indication of the narrow l window.NUCLEAR REACTIONS Partial fusion ¹⁵⁴Sm [¹⁴N, (p,d, or t) xnγ] ^156-160Er; E(¹⁴N)=167 MeV; measured γ-ray multiplicity, mass distribution of residual nuclei; deduced localized l window of entrance channel; discussed massive transfer model.