Study of SomeC12(He3,α)C

Abstract

The 13.9-MeV angular distributions for the C u (Hefyx)C u reactions which produce the ground, 2.00-, 4.32-, and 4.81-MeV states of C 11 were measured, using silicon surface-barrier detectors. The differential cross sections were determined at 2.5° intervals over a laboratory angular range from about 15° to 100°. The angular distributions display features which suggest that a direct-reaction mechanism is operative. The ground-state angular distribution is strongly peaked at forward angles with a weak washed-out oscillatory structure, and those for the excited states are also forward-peaked, but have a strong, well-denned oscillatory nature. The integrated cross sections over the common center-of-mass angular range (32° to 112°) for the ground and first three excited states are 30.5, 9.2, 9.7, and 11.9 mb, respectively. Each angular distribution was analyzed in terms of both zero-range distorted-wave Born-approximation knockout and pickup models. Reasonable correspondence between theory and experiment for the ground-state (f~) and second-excited-state (|~) angular distributions was achieved only with the pickup model, while only the knockout model provided a reasonable representation of the angular distributions corresponding to the first (|~) and third (f ~) excited states.* Work supported in part by the U. S. Atomic Energy Commission.t This report is based on part of a

Two-neutron transfer reaction mechanisms in $^{12}$C($^6$He,$^{4}$He)$^{14}$C using a realistic three-body $^{6}$He model

“…For completeness, we examine the same reaction at 18 MeV [23]. The entrance channel ( 6 He+ 12 C), exit channel ( 4 He+ 14 C) and sequential channel ( 5 He+ 13 C) were adjusted to those used by Milin et al [47]. All structure information introduced in this calculation was kept the same as that used for the analysis of the 30 MeV reaction, for a meaningful comparison.…”