Evidence for surface. alpha. -particle clusters in (nat)Ag(197)Au from the (e,. alpha. ) reaction
Technical Report
·
OSTI ID:5309145
The (nat) Ag and (197) Au (e,p) and (e, {alpha}) energy and angular distributions were measured at 6 electron bombarding energies between 50 and 115 MeV at the National Institute of Standards and Technology. The (nat) Ag and (197) Au (e,p) angular distributions exhibit an asymmetric component which increases from 0 to 50% as the proton energy increases from the proton Coulomb barrier to 26 MeV. The (nat) Ag and (197) Au (e, {alpha}) angular distributions exhibit an asymmetric component which increases from 0 to 30% as the {alpha} energy increases from the {alpha} particle Coulomb barrier to 26 MeV. The authors conclude that the asymmetric component of the proton and {alpha} particle yields are the result of direct or semidirect processes rather than resonance processes and hence, because of the short mean free paths of {alpha} particles in nuclear matter, give evidence for the existence of {alpha} particle clusters in the nuclear surface.
- Research Organization:
- National Inst. of Standards and Technology (PL), Gaithersburg, MD (United States)
- OSTI ID:
- 5309145
- Report Number(s):
- PB-91-216812/XAB; NISTIR--4495
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
651720* -- Nuclear Properties & Reactions
A=90-149
Experimental
651920 -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BARYONS
BASIC INTERACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
DIRECT REACTIONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELECTRON REACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GOLD 197 TARGET
GRAPHS
HADRONS
INTERACTIONS
LEPTON REACTIONS
MATHEMATICAL MODELS
MATTER
MEAN FREE PATH
METALS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR MATTER
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROTONS
SILVER
TARGETS
TRANSITION ELEMENTS
A=90-149
Experimental
651920 -- Nuclear Properties & Reactions
A=190-219
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BARYONS
BASIC INTERACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CLUSTER MODEL
DIRECT REACTIONS
DISTRIBUTION
ELECTROMAGNETIC INTERACTIONS
ELECTRON REACTIONS
ELECTROPRODUCTION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
GOLD 197 TARGET
GRAPHS
HADRONS
INTERACTIONS
LEPTON REACTIONS
MATHEMATICAL MODELS
MATTER
MEAN FREE PATH
METALS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR MATTER
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROTONS
SILVER
TARGETS
TRANSITION ELEMENTS