2c(6li, D)160 at E(li) = 90 Mev

The 12C(6Li, d)160 reaction has been studied at E ( ~ L i ) = 90.2 MeV with a magnetic spectrometer. Spectra up to E x ~ 30 MeV in 160 have been obtained and decay line widths, F~ .. . . have been extracted for broad levels. Known a-cluster states ( J " = 2 +, E x = 6.9 MeV; J ~ = 4 +, E x = 10.35 MeV) are preferentially populated and exhibit sharply forward peaked angular distributions in contrast with (eLi, d) data obtained at lower bombarding energies. These features are well reproduced by reaction calculations assuming direct alpha-particle transfer provided one utilizes realistic optical model, target, and projectile wave functions. Alpha spectroscopic factors and reduced alpha widths have been extracted for levels E~ < 12 MeV including J~ = 1levels of astrophysical interest. The results are compared with other recent measurements and theoretical calculations. There is generally at least qualitative agreement (within × 2) between the various experiments and theories. The analysis indicates a non-negligible alpha width for the J" = 1 level at E, = 7.1 MeV in 160 (which determines the ~ 2C ~ 160 stellar helium burning rate) with 0.3 < 0~ 2 (7.1 MeV)/0~ (9.6 MeV) < 0.6 and 0.1 < 02 (7.1 MeV)/0~ (6.9 MeV) < 0.4. E N U C L E A R R E AC T ION IzC(6Li, d), E = 90.2 MeV: measured a(Ed, 0~). 160 deduced e-cluster states, a-reduced widths, S~, resonances, F. Optical model, direct e-transfer mechanism, realistic target, projectile wave functions. Magnetic spectrometer.