Scission gamma rays

Journal Article · Sun Nov 15 04:00:00 EST 2009 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778809110027· OSTI ID:21449001

Klenke, J ^[1]; Krakhotin, V A; Kuznetsov, V L; Novitsky, V V; Pavlov, V S; Shatalov, P B ^[2]

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1. Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) (Germany)
2. Institute of Theoretical and Experimental Physics (Russian Federation)

Gamma rays probably emitted by the fissioning nucleus {sup 236}U* at the instant of the break of the neck or within the time of about 10{sup -21} s after or before this were discovered in the experiment devoted to searches for the effect of rotation of the fissioning nucleus in the process {sup 235}U(n,{gamma}f) and performed in a polarized beam of cold neutrons from the MEPHISTO Guideline at the FRM II Munich reactor. Detailed investigations revealed that the angular distribution of these gamma rays is compatible with the assumption of the dipole character of the radiation and that their energy spectrum differs substantially from the spectrum of prompt fission gamma rays. In the measured interval 250-600 keV, this spectrum can be described by an exponential function at the exponent value of {alpha} = -5 x 10{sup -3} keV{sup -1}. The mechanism of radiation of such gamma rays is not known at the present time. Theoretical models based on the phenomenon of the electric giant dipole resonance in a strongly deformed fissioning nucleus or in a fission fragment predict harder radiation whose spectrum differs substantially from the spectrum measured in the present study.

• OSTI ID: 21449001
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 11 Vol. 72; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
BARYONS
BEAMS
COLD NEUTRONS
COLOR MODEL
COMPOSITE MODELS
DIPOLES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY SPECTRA
ENRICHED URANIUM REACTORS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
FISSION
FISSION FRAGMENTS
FRM-II REACTOR
GAMMA RADIATION
HADRONS
HEAVY NUCLEI
HEAVY WATER MODERATED REACTORS
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
MULTIPOLES
NEUTRONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARTICLE MODELS
POLARIZED BEAMS
POOL TYPE REACTORS
QUARK MODEL
RADIATIONS
RADIOISOTOPES
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
SPECTRA
SPONTANEOUS FISSION RADIOISOTOPES
THERMAL REACTORS
URANIUM 235
URANIUM 236
URANIUM ISOTOPES
WATER COOLED REACTORS
WATER MODERATED REACTORS
YEARS LIVING RADIOISOTOPES