Restoration of isospin symmetry in highly excited compound nuclei

We have deduced compound nuclear isospin mixing in [sup 28]Si[sup *] and [sup 26]Al[sup *] at excitation energies between 33 and 65 MeV. The [gamma]-ray yield from the decay of giant dipole resonances built on excited states is found to be suppressed, implying that isospin mixing is small. By compar...

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Bibliographic Details
Published in:Physical review letters 1993-05, Vol.70 (21), p.3201-3204
Main Authors: Behr, JA, Snover, KA, Gossett, CA, Kicinska-Habior, M, Gundlach, JH, Drebi, ZM, Kaplan, MS, Wells, DP
Format: Article
Language:English
Subjects:
ALKALINE EARTH ISOTOPES
ALUMINIUM 26
ALUMINIUM 28
ALUMINIUM ISOTOPES
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON 11 TARGET
CARBON 12
CARBON 12 TARGET
CARBON 13 REACTIONS
CARBON 13 TARGET
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
COMPOUND NUCLEI
CROSS SECTIONS
DECAY
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
GIANT RESONANCE
HADRON REACTIONS
HEAVY ION REACTIONS
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 26
MAGNESIUM ISOTOPES
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
MIXING
NITROGEN 14 REACTIONS
NITROGEN 15 REACTIONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
OXYGEN 16 REACTIONS
OXYGEN 18 REACTIONS
PARTICLE DECAY
PARTICLE PROPERTIES
PROTON REACTIONS
RADIATIVE DECAY
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES
SILICON 28
SILICON 30
SILICON ISOTOPES
STABLE ISOTOPES
SYMMETRY BREAKING
TARGETS
YEARS LIVING RADIOISOTOPES 663300 > Nuclear Reactions & Scattering, General-- (1992-)
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Summary:We have deduced compound nuclear isospin mixing in [sup 28]Si[sup *] and [sup 26]Al[sup *] at excitation energies between 33 and 65 MeV. The [gamma]-ray yield from the decay of giant dipole resonances built on excited states is found to be suppressed, implying that isospin mixing is small. By comparison with data from the literature at lower excitation energy, we conclude that isospin is a better symmetry in these compound nuclei at high excitation energy.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.70.3201