The decay of hot nuclei formed in La-induced reactions at E/A=45 MeV

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/10149033· OSTI ID:10149033

Libby, Bruce ^[1]

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1. Univ. of Maryland, College Park, MD (United States)

The decay of hot nuclei formed in the reactions ¹³⁹La + ²⁷Al, ⁵¹V, ^natCu, and ¹³⁹La were studied by the coincident detection of up to four complex fragments (Z > 3) emitted in these reactions. Fragments were characterized as to their atomic number, energy and in- and out-of-plane angles. The probability of the decay by an event of a given complex fragment multiplicity as a function of excitation energy per nucleon of the source is nearly independent of the system studied. Additionally, there is no large increase in the proportion of multiple fragment events as the excitation energy of the source increases past 5 MeV/nucleon. This is at odds with many prompt multifragmentation models of nuclear decay. The reactions ¹³⁹La + ²⁷Al, ⁵¹V, ^natCu were also studied by combining a dynamical model calculation that simulates the early stages of nuclear reactions with a statistical model calculation for the latter stages of the reactions. For the reaction ¹³⁹La + ²⁷Al, these calculations reproduced many of the experimental features, but other features were not reproduced. For the reaction ¹³⁹La + ⁵¹V, the calculation failed to reproduce somewhat more of the experimental features. The calculation failed to reproduce any of the experimental features of the reaction ¹³⁹La + ^natCu, with the exception of the source velocity distributions.

• Research Organization: Maryland Univ., College Park, MD (United States). Dept. of Chemistry and Biochemistry
• Sponsoring Organization: USDOE
• DOE Contract Number: FG05-87ER40321
• OSTI ID: 10149033
• Report Number(s): DOE/ER/40321--10; ON: DE93013384
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
ATOMIC NUMBER
COPPER
DALITZ PLOT
DEEP INELASTIC HEAVY ION REACTIONS
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EXPERIMENTAL DATA
GEV RANGE 01-10
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KINETIC ENERGY
LANTHANUM 139 REACTIONS
LANTHANUM 139 TARGET
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VANADIUM 51 TARGET