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

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Bulletin of the American Physical Society

OSTI ID:255432

Charity, R J; Sobotka, L G; Robertson, N J; Sarantites, D G ^[1]

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1. and others

The fragmentation of E/A=40 MeV {sup 20}Ne projectiles into exit channels containing only p, d, 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.

• OSTI ID: 255432
• Report Number(s): CONF-9510116--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 10 Vol. 40; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GOLD 197 TARGET
NEON 20 REACTIONS
NUCLEAR DECAY
NUCLEAR FRAGMENTATION
TIN 120 TARGET