Observation of a triple correlation in ternary fission: is time reversal invariance violated?

Nuclear spin-orbit interaction and T-odd angular correlations in ternary fission

“…Hence, according to the data [4,5] (for the target nuclei 233 U) the function W 1 dominates, while the function W 2 is suppressed for some reasons. In other words, T-effect, when D 13 ≃ D 24 , corresponds to dominance of W 1 and suppression of W 2 .…”

“…It was shown that the asymmetry of α-particle emission can be caused by an interaction of spin J 0 of the system of two fragments separating from each other and the orbital momentum l of already separated α particle, i.e., spin-orbit interaction ∼ lJ 0 . I discussed this hypothesis with the authors of the works [4,5], that is why the model of spin-orbit interaction was mentioned in [4,5]. The most complete description of the model was presented at the conference in Dubna in 2001 and published in its proceedings [6].…”

“…In the first publications [3,4] devoted to detection of T-odd angular correlation (s[p LF ×p α ]) in ternary fission of nuclei 233 U by slow (s-wave) polarized neutrons, possible relation to TRI violation has been allowed, therefore the above correlation was labelled as TRI effect. Here s, p LF , p α are the spin of an incident neutron, the momenta of light fragment and α particle (see Fig.…”

Measurement of the ROT effect in the neutron induced fission of 235U in the 0.3 eV resonance at a hot source of polarized neutrons

“…The first effect of this type, the so called TRI-effect was discovered at the ILL reactor (Grenoble) by a collaboration of Russian and European institutes [1,2] in an experiment aimed at the search for violation of time reversal invariance (TRI) following the idea, proposed in [3]. It was found that the probability of emission of an alpha-particle in ternary fission in the direction perpendicular to the plane formed by the neutron spin and the fragment momentum shows a pronounced anisotropy.…”

A method to measure neutron polarization using P-even asymmetry of γ-quantum emission in the neutron-nuclear interaction

“…Potential applications include measurement/monitoring of the neutron beam polarization in experiments with frequently varying configuration, which are typical, for instance, for neutron instruments devoted to fundamental particle physics [10]: to give examples: * The text was submitted by the authors in English. 1 [ [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]; applicability of this method to experiments demanding the highest precision in the neutron polarization analysis, like to precision studies of the neutron β decay [27] has to be studied.…”