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High-resolution photoneutron study of E1 and M1 transitions in /sup 208/Pb

Journal Article · · Phys. Rev., C; (United States)
; ; ;

The photoneutron cross section of /sup 208/Pb was observed using a very high resolution time-of-flight spectrometer. The cross sections were observed in the photoneutron energy range 16 to 1000 keV and at reaction angles of 90/sup 0/ and 135/sup 0/. The deduced ground-state radiative widths were calibrated to the well-known /sup 2/H(..gamma..,n)/sup 1/H reaction cross section. The 7.99-MeV resonance, previously believed to be an M1 excitation, is shown to be an E1 resonance. Current progress in the search for the collective M1 resonance in /sup 208/Pb is reviewed. In addition, recent theoretical predictions of the properties of the giant M1 resonance are reviewed. Finally, the present high resolution observations in conjunction with previous photoneutron polarization measurements were employed in order to deduce the s-d-wave admixtures for eight E1 excitations.

Research Organization:
Argonne National Laboratory, Argonne, Illinois 60439
OSTI ID:
5986597
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:1; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651923* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Energy Levels & Transitions-- (-1987)
651925 -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYONS
CROSS SECTIONS
DIPOLES
DISTRIBUTION
E1-TRANSITIONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FERMIONS
GIANT RESONANCE
HADRONS
HEAVY NUCLEI
ISOTOPES
LEAD 208
LEAD 208 TARGET
LEAD ISOTOPES
M1-TRANSITIONS
MAGNETIC DIPOLES
MULTIPOLE TRANSITIONS
MULTIPOLES
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PHOTONEUTRONS
PHOTONUCLEAR REACTIONS
PHOTONUCLEONS
POLARIZATION
RESONANCE
STABLE ISOTOPES
TARGETS