Particle-gamma ray coincidence studies on /sup 62/Ni

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5265021

Wiggins, Jr, J D

To help understand the reaction mechanism of medium energy protons incident upon nickel nuclei and to determine the decay modes of excitations within the nuclear continuum, the gamma rays characteristic of transitions within particular residual nuclei have been measured in coincidence with continuum protons resulting from 81.5 MeV and 199.8 MeV proton bombardments of /sup 62/Ni. A similar measurement with 150.5 MeV ..cap alpha.. + /sup 62/Ni was performed to investigate projectile dependence. In an examination of giant resonance (GR) decay, systematics of coincidence data from 150.5 MeV ..cap alpha.. + /sup 62/Ni excitation of the giant quadrupole resonance (GQR) at THETA/sub ..cap alpha../ = 15.8/sup 0/ are not inconsistent with statistical decay of the GQR. Alternatively, little or no gamma radiation appears to be associated with the decay of the GR excited by 81.5 MeV p + /sup 62/Ni measured at THETA/sub p/ = 25/sup 0/, 35/sup 0/, and 45/sup 0/. Hence, the proton excited resonance seems to decay nonstatistically. The single proton differential cross section for the entire GR structure at 25/sup 0/ significantly overdepletes the monopole and quadrupole energy weighted sum rules, and relative strengths at the three angles are consistent with the observed GR being an 1 = 1 excitation. The proton and alpha bombardment results can be reconciled if the protons are assumed to excite the giant dipole resonance (GDR) strongly. Model dependent interpretations of the general mechanism indicate that the measured fast particle results prinarily from the first interaction of the projectile with a nucleon within the nucleus. To determine the extent that observed particles result from subsequent interactions and to clarify the anomoly of the GR decay, particle-particle coincidence and more detailed particle singles measurements should be performed.

• Research Organization: Indiana Univ., Bloomington (USA)
• OSTI ID: 5265021
• Country of Publication: United States
• Language: English

Related Subjects

651623 -- Nuclear Properties & Reactions
A=59-89
Experimental-- Energy Levels & Transitions-- (-1987)
651625* -- Nuclear Properties & Reactions
A=59-89
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
DATA
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
GIANT RESONANCE
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NICKEL 62
NICKEL 62 TARGET
NICKEL ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
PROTON REACTIONS
RESONANCE
SCATTERING
SPECTRA
STABLE ISOTOPES
TARGETS