Prompt and sequential decay processes in the fragmentation of 40 MeV/nucleon {sup 20}Ne projectiles

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.3126· OSTI ID:132943

Charity, R J; Sobotka, L G; Robertson, N J; Sarantites, D G ^[1]; Dinius, J; Gelbke, C K; Glasmacher, T; Handzy, D O; Hsi, W C; Huang, M J; Lynch, W G; Montoya, C P; Peaslee, G F; Schwarz, C; Tsang, M B ^[2]

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1. Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States)
2. National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)

The fragmentation of {ital E}/{ital A}=40 MeV {sup 20}Ne projectiles into exit channels containing only {ital p}, {ital d}, {ital t}, {sup 3}He, {alpha}, {sup 6}He, {sup 6}Li, and {sup 7}Li fragments has been investigated. Relative shifts between the average longitudinal velocity of each fragment type were measured with {sup 120}Sn and {sup 197}Au targets. A post-breakup Coulomb acceleration component of these shifts was isolated. Its magnitude indicates that the projectile broke up while in near contact with the target. On the other hand, correlations between projectile fragments indicate that a significant fraction of these fragments are produced by the sequential decay of long- and short-lived unstable intermediates. A fully sequential decay process, although consistent with the experimental relative angle distributions, fails to reproduce the correlation function. Thus, a picture emerges of a prompt breakup step producing stable and unstable particles with the subsequent decay of the latter extending over a long time period.

• Research Organization: Washington University
• DOE Contract Number: FG02-87ER40316; FG02-88ER40406
• OSTI ID: 132943
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ALPHA PARTICLES
CORRELATION FUNCTIONS
DEUTERONS
GOLD 197 TARGET
HELIUM 3
HELIUM 6
LITHIUM 6
LITHIUM 7
MEV RANGE 100-1000
NEON 20 REACTIONS
NUCLEAR DECAY
NUCLEAR FRAGMENTATION
PROTONS
TIN 120 TARGET
TRITONS