Yu. A. Mostovoi’s research while affiliated with Kurchatov Institute and other places

... A main advantage of the simple approach, utilized well by experimental physicists, has been to avoid the difficulty of dealing with the multitude of beta decay interactions. For observed differences of various kinds between theoretical and experimental quantities of IB accompanying beta decay, it has been important to confirm this fundamental concept [24]. ...

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Acceleration for infrared radiation

... Given the exceedingly small interaction cross section for antineutrinos, this correlation is typically measured by detecting the outgoing proton, possibly in coincidence with the outgoing electron. Because the proton emerges with a maximal kinetic energy of 751 eV, these are detected after post-acceleration using a variety of detector technologies [54][55][56][57][58][59][60]. The Nab experiment uses high-purity, thick silicon detectors [61,62] which display excellent linearity over the full range of energies for electrons emerging from neutron β decay. ...

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Precision pulse shape simulation for proton detection at the Nab experiment

... Experimentell lässt sich der Einfluss einer inhomogenen Detektoreffizienz durch teilweises Abdecken eines Einzeldetektors untersuchen (siehe z.B. [ERO74]). Ist ein Einzeldetektor aus mehreren unabhängig 20) Beispiel: Es ist "symmetrischer", einen Szintillator an beiden Enden auszulesen, als ein Ende zu verspiegeln. ...

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Test der Zeitumkehrinvarianz am D-Koeffizienten des freien Neutronenzerfalls mit Trine [Elektronische Ressource] /

... Uniform statistical mixing of spin projections on the symmetry axis for such states of the fissioning nucleus near the point of its rupture, as shown in [3], leads to the complete disappearance of anisotropies of different P and T parities in the angular distributions of the fission fragments. Since such anisotropies are well established for low-energy fission [25,[39][40][41][42][43][44][45], it can be concluded that the nucleus remains in a "cold" state up to the point of rupture, although in a non-equilibrium state with respect to deformation. ...

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Spin distribution of fission fragments involving bending and wriggling modes

... One of the unobvious but probable initial hypothesis on enigmatic source of the hydrogen in operating nuclear reactor is generation of protons as a product of beta-decay of free neutrons (lifetime ~15 min.) [10]. ...

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Alloying of steel and graphite by hydrogen in nuclear reactor

... The two minima differ only by the signs of the scalar and tensor couplings which change simultaneously. Such a scenario has recently been considered in the analysis of selected data from neutron decay (Mostovoi et al., 2000). Although the technique used there for the determination of the couplings differs from the one presented here, the conclusions regarding the scalar and tensor couplings are similar, namely that for each minimum the two couplings have the same sign. ...

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Tests of the standard electroweak model in nuclear beta decay

... The black horizontal lines from top to bottom correspond to: typical energies available in nuclear fission processes, the mass difference between neutron and proton, and the spectrum of visible light. The red region is excluded by the overlap of searches for in beam experiments [42][43][44][45][46], while the blue region is excluded by the search in the bottle experiment [47]. White regions are not excluded by the listed observations. ...

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Exciting hint toward the solution of the neutron lifetime puzzle

... This is unlike the experiments i) on the neutron beta decay for polarized neutrons and transversally polarized electrons [17,24,75,76] and ii) on the nuclear beta decays for unpolarized nuclei and longitudinally polarized decay positrons [12,[77][78][79]. Moreover, the dependence of the correlation structure on the antineutrino 3-momentum demands a simultaneous detection of decay electron and protons, i.e. electron-proton pairs, similar to the measurements of the antineutrino asymmetry [81][82][83]. The theoretical analysis of the antineutrino asymmetry in the neutron beta decay, related to the correlation coefficient B(E e ), was carried out by Glück et a. [80] (see also [28]). ...

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On a new correlation coefficient of the neutron beta decay, caused by the correlation structure invariant under discrete P, C and T symmetries

... The nucleon axial coupling, g A , is a critical quantity for determining many nuclear physics processes, from the primordial abundances of hydrogen and helium formed during Big Bang Nucleosynthesis [1], to our theoretical understanding of Solar Fusion [2], and to relating precision measurements of nuclear β decay rates to Standard Model (SM) parameters [3]. Measurements of g A from the β-asymmetry of ultracold neutron decays have yielded an experimental value at the 0.1% precision level, but with some tension between the results [4][5][6][7][8][9][10][11][12][13] that go into the PDG average [14]. The most precise measurement has a total uncertainty of 0.04% [11]. ...

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Signs of Non-Monotonic Finite-Volume Corrections to $g_A

... An analogous situation was first noted in [9], then it was observed during the experiment on the measurement of the correlation coefficients by the group at ILL [5,10] and emiT group at NIST [11], and it was also mentioned at [12]. We would especially like to emphasize the correspondence of our spectrum of double coincidences with an analogous spectrum from the result obtained by the emiT group from NIST [11]. ...

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Characteristic Features of Double and Triple Coincidence Spectra Coupling in Radiative Neutron Decay