Tri And Rot Effects In Ternary Fission: What Can Be Learned?

Journal Article · Fri Apr 30 04:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3431434· OSTI ID:21367186

Goennenwein, F ^[1]; Gagarski, A; Petrov, G; Guseva, I; Zavarukhina, T ^[2]; Mutterer, M; Kalben, J von ^[3]; Kopatch, Yu ^[4]; Tiourine, G ^[5]; Trzaska, W; Sillanpaea, M ^[6]; Soldner, T; Nesvizhevsky, V ^[7]

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1. Physikalisches Institut, Universitaet Tuebingen, Tuebingen (Germany)
2. Petersburg Nuclear Physics Institute, Gatchina (Russian Federation)
3. Institut fuer Kernphysik, Technische Universitaet Darmstadt (Germany)
4. Frank Laboratory of Neutron Physics, Joint Institute of Nuclear Research, Dubna (Russian Federation)
5. Khlopin Radium Institute, St. Petersburg (Russian Federation)
6. Department of Physics, University of Jyvaeskylae (Finland)
7. Institut Laue-Langevin, Grenoble (France)

Inducing fission by polarized neutrons allows studying subtle effects of the dynamics of the process. In the present experiments ternary fission of {sup 235}U and {sup 239}Pu was investigated with cold neutrons in the (n,f) reaction at the Institut Laue-Langevin, Grenoble. Asymmetries in the emission of ternary particles were discovered by making use of the neutron spin flipping. It was found that two effects are interfering. There is first an asymmetry in the total yields of ternary particles having been called the TRI-effect. Second, it was observed that the angular distributions of ternary particles are shifted back and forth when flipping the neutron spin. This shift was named ROT effect. Guided by trajectory calculations of the three-body decay, the signs and sizes of the ROT effect are interpreted in terms of the K-numbers of the transition states at the saddle point of fission.

• OSTI ID: 21367186
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1224; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
ASYMMETRY
BARYON REACTIONS
BARYONS
COLD NEUTRONS
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
EVEN-ODD NUCLEI
FERMIONS
FISSION
HADRON REACTIONS
HADRONS
HEAVY NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MANY-BODY PROBLEM
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NEUTRONS
NUCLEAR DECAY
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTICLE PROPERTIES
PLUTONIUM 239
PLUTONIUM ISOTOPES
POLARIZATION
RADIOISOTOPES
SPIN
SPIN FLIP
SPONTANEOUS FISSION
SPONTANEOUS FISSION RADIOISOTOPES
TERNARY FISSION
THREE-BODY PROBLEM
URANIUM 235
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
YIELDS