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Crystal ball studies of giant resonance gamma decay

Conference ·
OSTI ID:6190696
; ;
We have carried out coincidence experiments to investigate the photon and neutron emission from the giant resonance region in /sup 208/Pb and /sup 90/Zr using the ORNL Spin Spectrometer, a 72-segment NaI detector system. States in /sup 208/Pb and /sup 90/Zr were excited by inelastic scattering of 380-MeV /sup 17/O. We have determined the total gamma-decay probability, the ground-state gamma branching ratio, and the branching ratios to a number of low-lying states as a function of excitation energy in /sup 208/Pb to approx. 15 MeV. Especially interesting observations include the absence of a significant branch from the giant quadrupole resonance to the 3/sup -/ state at 2.6 MeV, a strong branch from this resonance to a 3/sup -/ state at 4.9 MeV, and the dominance of decays to various 1/sup -/ states at 5 to 7 MeV from the region around 14 MeV of excitation (EO resonance). Comparable but less complete data were also obtained on /sup 90/Zr. 14 references.
Research Organization:
Oak Ridge National Lab., TN (USA)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
6190696
Report Number(s):
CONF-840906-14; ON: DE85003543
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
DATA
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GIANT RESONANCE
HEAVY ION REACTIONS
HEAVY NUCLEI
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 208
LEAD 208 TARGET
LEAD ISOTOPES
LEVEL WIDTHS
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 100-1000
NAI DETECTORS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 17 REACTIONS
RADIATION DETECTORS
RADIOISOTOPES
RESONANCE
SCATTERING
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
STABLE ISOTOPES
TARGETS
ZIRCONIUM 90
ZIRCONIUM 90 TARGET
ZIRCONIUM ISOTOPES