Two-neutron transfer in the {sup 6}He+{sup 209}Bi reaction near the Coulomb barrier

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.051601· OSTI ID:20698639

DeYoung, P A; Mears, Patrick J; Guess, C; Khadka, U; Pena, A; Rieth, J ^[1]; Kolata, J J; Cloughesy, M ^[2]; Aguilera, E F; Lizcano, D; Martinez-Quiroz, E ^[3]; Becchetti, F D; Chen, Y; Griffin, H; Jiang, H; Ojaniega, M ^[4]; Hinnefeld, J D; Driessche, S van den ^[5]; Jones, Scott R; Zimmerman, J A ^[6]

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

The cross section for {alpha}-particle emission in the {sup 6}He+{sup 209}Bi reaction at energies near the Coulomb barrier is remarkably large. Possible reactions that may produce the observed {alpha} particles include two-neutron transfer, one-neutron transfer, and direct projectile breakup. Each of these mechanisms results in a distinctive angular correlation between the {alpha} particle and the outgoing neutron(s). A neutron-{alpha}-particle coincidence experiment was performed to study two-neutron transfer to unbound states of {sup 211}Bi. It is shown that approximately 55% of the observed {alpha}-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.

• OSTI ID: 20698639
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR CORRELATION
BISMUTH 209 TARGET
BISMUTH 211
COINCIDENCE SPECTROMETRY
COULOMB FIELD
CROSS SECTIONS
DIRECT REACTIONS
HELIUM 6 REACTIONS
NEUTRON TRANSFER
NUCLEAR REACTION YIELD