Investigations of the Space Parity Violation and Interference Effects in the Fragment Angular Distributions of 235U, 233U, and 239Pu Fission by Resonance Neutrons

Journal Article · Tue May 24 00:00:00 EDT 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1945107· OSTI ID:20722660

Sokolov, V E; Gagarski, A M; Guseva, I S; Golosovskaya, S P; Krasnoshchokova, I S; Petrov, G A; Petrova, V I; Petukhov, A K; Pleva, Yu S ^[1]; Alfimenkov, V P; Chernikov, A N; Lason, L; Mareev, Yu D; Novitski, V V; Pikelner, L B; Pikelner, T L; Tsulaya, M I ^[2]

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1. Department of Neutron Physics, PNPI of RAS, 188350 Gatchina (Russian Federation)
2. M. Frank Laboratory of Nuclear Physics, JINR, 141980 Dubna (Russian Federation)

Investigations of the space parity nonconserving (PNC) asymmetry of 233U, 235U, and 239Pu fission fragment emission and parity conserving (PC) interference effects of left-right and forward-backward asymmetries were carried out on the neutron beams of the reactor IBR-30 (JINR, Dubna) over the range of neutron energies from 0.02 eV to about 100 eV. All experimental results obtained have been found to be in a good mutual accordance within the frames of modern theoretical conceptions about the mechanisms of PNC and PC effects forming in fission process induced by slow neutrons. In case of the P-even interference effects of asymmetry the evident mutual well-marked irregularities in their neutron energy dependencies up to about 100 eV were observed. It is connected with the interference of s, p-resonances at fission compound stage according to modern theory. As a remarkable result of the PNC effect measurements the resonance behavior of the PNC asymmetry coefficients in the low neutron energy region (En < 2 eV) was observed. Unfortunately, the statistical accuracy of the PNC effect measurements is not enough for observation of these resonance effects in other cases of more high energies. Results of simultaneous analysis of all three asymmetry effects for all three nuclei are presented. The satisfactory combined description of the experimental points is received. As a result of theoretical evaluation of these data main parameters and the estimates of nuclear matrix elements of the weak interaction for some p-resonances in the low energy range were extracted.

• OSTI ID: 20722660
• Journal Information: AIP Conference Proceedings, Vol. 769, Issue 1; Conference: International conference on nuclear data for science and technology, Santa Fe, NM (United States), 26 Sep - 1 Oct 2004; Other Information: DOI: 10.1063/1.1945107; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY COEFFICIENTS
EV RANGE
FISSION
FISSION FRAGMENTS
INTERFERENCE
ION EMISSION
JINR
NEUTRON BEAMS
NEUTRON REACTIONS
NUCLEAR MATRIX
P INVARIANCE
PARITY
PLUTONIUM 239
RESONANCE
RESONANCE NEUTRONS
SLOW NEUTRONS
URANIUM 233
URANIUM 235
WEAK INTERACTIONS