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Electromagnetic decay of giant resonances

Conference ·
OSTI ID:5541149
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Coincidence experiments were done to investigate the photon and neutron emission from the giant resonance regions of /sup 208/Pb and /sup 90/Zr using the ORNL Spin Spectrometer, a 72-segment NaI detector system. 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. Similar data were also obtained on /sup 90/Zr. The total yield of ground-state E2 gamma radiation in /sup 208/Pb and the comparative absence of such radiation in /sup 90/Zr can only be understood if decay of compound (damped) states is considered. Other observations in /sup 208/Pb include the absence of a significant branch from the giant quadrupole resonance (GQR) to the 3/sup -/ state at 2.6 MeV, a strong branch to a 3/sup -/ state at 4.97 MeV from the same region, and transitions to various 1/sup -/ states between 5 to 7 MeV from the E* approx. 14 MeV region (EO resonance).
Research Organization:
Oak Ridge National Lab., TN (USA)
DOE Contract Number:
AC05-84OR21400
OSTI ID:
5541149
Report Number(s):
CONF-8505166-2; ON: DE85012422
Country of Publication:
United States
Language:
English

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Related Subjects

651723 -- Nuclear Properties & Reactions
A=90-149
Experimental-- Energy Levels & Transitions-- (-1987)
651923* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
DATA
E2-TRANSITIONS
EMISSION
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GAMMA SPECTRA
GIANT RESONANCE
HEAVY ION REACTIONS
HEAVY NUCLEI
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 208
LEAD ISOTOPES
MULTIPOLE TRANSITIONS
NEUTRON EMISSION
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 17 REACTIONS
RADIOISOTOPES
RESONANCE
SCATTERING
SPECTRA
STABLE ISOTOPES
ZIRCONIUM 90
ZIRCONIUM ISOTOPES