Two-neutron Transfer in the 6He + 209Bi Reaction near the Coulomb Barrier
The cross section for α-particle emission in the He6+Bi209 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 Bi211. 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.
Repository citation: DeYoung, Paul A.; Mears, Patrick J.; Kolata, J. J.; Aguilera, E. F.; Becchetti, F. D.; Chen, Y.; Cloughesy, M.; Griffin, H.; Guess, C.; Hinnefeld, J. D.; Jiang, H.; Jones, Scott R.; Khadka, U.; Lizcano, D.; Martinez-Quiroz, E.; Ojaniega, M.; Peaslee, Graham F.; Pena, A.; Reith, J.; VanDenDriessche, S.; and Zimmerman, J. A., "Two-neutron Transfer in the 6He + 209Bi Reaction near the Coulomb Barrier" (2005). Faculty Publications. Paper 1213.
Published in: Physical Review C, Volume 71, Issue 5, May 13, 2005, pages 51601-51601. Copyright © 2005 American Physical Society.