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Two-neutron transfer in the He6+Bi209 reaction near the Coulomb barrier

P. A. DeYoung, Patrick J. Mears, J. J. Kolata, E. F. Aguilera, F. D. Becchetti, Y. Chen, M. Cloughesy, H. Griffin, C. Guess, J. D. Hinnefeld, H. Jiang, Scott R. Jones, U. Khadka, D. Lizcano, E. Martinez-Quiroz, M. Ojaniega, G. F. Peaslee, A. Pena, J. Rieth, S. VanDenDriessche, and J. A. Zimmerman
Phys. Rev. C 71, 051601(R) – Published 13 May 2005

Abstract

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.

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  • Received 13 September 2004

DOI:https://doi.org/10.1103/PhysRevC.71.051601

©2005 American Physical Society

Authors & Affiliations

P. A. DeYoung1, Patrick J. Mears1, J. J. Kolata2, E. F. Aguilera3, F. D. Becchetti4, Y. Chen4, M. Cloughesy2, H. Griffin4, C. Guess1, J. D. Hinnefeld5, H. Jiang4, Scott R. Jones6, U. Khadka1, D. Lizcano3, E. Martinez-Quiroz3, M. Ojaniega4, G. F. Peaslee7, A. Pena1, J. Rieth1, S. VanDenDriessche5, and J. A. Zimmerman6

  • 1Department of Physics and Engineering, Hope College, Holland, Michigan 49423-9000
  • 2Physics Department, University of Notre Dame, Notre Dame, Indiana, 46556-5670
  • 3Departamento del Acelerador, Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, C.P. 11801, Mexico, D.F.
  • 4Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1120
  • 5Physics Department, Indiana University South Bend, South Bend, Indiana 46634-7111
  • 6Department of Chemistry, Southwest Missouri State University, Springfield, Missouri 65804-0094
  • 7Department of Chemistry, Hope College, Holland, Michigan 49423-9000

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Issue

Vol. 71, Iss. 5 — May 2005

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