Measurement of charged and neutral elementary particles emitted from antiproton annihilation at rest in heavy nuclei. Final report, 1 May 87-30 Apr 91
The first complete spectrum of neutrons from antiproton induced fission of Uranium has been obtained. Features of the spectrum are explained by three processes: emission of prompt ejectiles driven from the nucleus by pions in the intranuclear cascade, evaporation of neutrons from the excited nucleus before fission, and de-excitation of fission fragments. The temperature of the fission neutrons is about 67% higher than normal fission, indicating large residual energy deposited in the fission fragments. Hence, the fission process serves as a window into the excitation process itself. Results have also been obtained on gamma-rays associated with de-excitation of fission fragments after neutron emission. With respect to normal fission, the relative yield of gamma-rays to neutrons is suppressed, but the temperature of the gamma-rays is higher. Energy transfer by pi-zeros in the intranculear cascade initiated by antiproton annihilation at rest in carbon and uranium has been measured. The prospects for initiating multifragmentation and disintegration of heavy nuclei appear good.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States). Lab. for Elementary Particle Science
- OSTI ID:
- 6134396
- Report Number(s):
- AD-A-238789/2/XAB; CNN: AFOSR-87-0246
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIPROTON REACTIONS
FISSION
URANIUM
ANNIHILATION
CARBON
ELEMENTARY PARTICLES
EXCITATION
FISSION NEUTRONS
GAMMA RADIATION
NEUTRON SPECTRA
NUCLEAR CASCADES
NUCLEAR REACTION KINETICS
ACTINIDES
ANTINUCLEON REACTIONS
BARYON REACTIONS
BARYONS
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY-LEVEL TRANSITIONS
FERMIONS
HADRON REACTIONS
HADRONS
INTERACTIONS
IONIZING RADIATIONS
KINETICS
METALS
NEUTRONS
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
RADIATIONS
REACTION KINETICS
SPECTRA
663470* - Fission- (1992-)
663590 - Nuclear Mass Ranges- A=220 & Above- (1992-)