Two-neutron transfer in the 6He+209Bi reaction near the Coulomb barrier
Abstract
The cross section for α-particle emission in the 6He+209Bi reaction at energies near the Coulomb barrier is remarkably large. Possible reactions that may produce the observed α particles include two-neutron transfer, one-neutron transfer, and direct projectile breakup. Each of these mechanisms results in a distinctive angular correlation between the α particle and the outgoing neutron(s). A neutron-α-particle coincidence experiment was performed to study two-neutron transfer to unbound states of 211Bi. It is shown that approximately 55% of the observed α-particle yield at and beyond the grazing angle is because of this process. This is more than 2.5 times the fraction attributable to single-neutron transfer. The corresponding 2n-transfer cross section is 0.4 ± 0.1 b.
- Publication:
-
Physical Review C
- Pub Date:
- May 2005
- DOI:
- 10.1103/PhysRevC.71.051601
- Bibcode:
- 2005PhRvC..71e1601D
- Keywords:
-
- 25.60.Je;
- 27.20.+n;
- Transfer reactions;
- 6<
- =A<
- =19