Velocity distributions of mass-identified evaporation residues produced in the Si+ Ca reaction have been measured at bombarding energies of 309, 397, and 452 MeV using time-of-flight techniques. These distributions were used to identify evaporation residues and to separate the complete-fusion and incomplete-fusion components. Angular distributions and upper limits for the total evaporation-residue and complete-fusion evaporation-residue cross sections were extracted at all three bombarding energies. The complete-fusion evaporation-residue cross sections and the deduced critical angular momenta are compared with earlier measurements and the predictions of existing models. The ratios of the complete-fusion evaporation-residue cross section to the total evaporation-residue cross section, along with those measured for the Si+ ' C and Si+ Si systems at the same energies, support the entrancechannel mass-asymmetry dependence of the incomplete-fusion evaporation-residue process reported earlier.PACS number(s): 25.70.Jj

No abstract

No abstract

No abstract

The lifetimes of the J = 0+ 6590-keV and J = 3 6728-keV states in "C and the J = 3 5834-keV state in '4Nwere measured using the recoil distance method. Gamma rays following the pn and 2n evaporation channels from 'Be+'Li reactions were detected at 8"= O'. The experimental results are "C(6590,0+),~= 3.7+0.9 ps; "C(6728,3 ), r = 96~15 ps; "N(5834,3 ), r = 12.9+1.9 ps. Extensive shell-model calculations for both "C and "N have been performed using an SU(3) basis and are compared to these and other experimental results.NUCLEAB BEACTIONS~Li{OBe,pnp) Es, =5.5 MeV Be{Li,pep) andBe{TLi,2gy) E & = 3.8-7.8 Mev; measured E,1,{recoil distance method); calculated 7 from theory and compared with experiment,