The surface properties of powder particles of 316L steel and Inconel 718 alloy applied in additive technologies have been studied, including interaction with hydrogen of specimens fabricated from these powders by selective laser melting.

A cryogenic liquid-tritium target was developed by RFNC−VNIIEF for studying ptμ fusion. In 2016, it was regularly used for more than 270 h on the muon channel of the JINR Phasotron, thus confirming the compliance with the specified requirements and the correctness of the proposed engineering solutions. At a maximum operating pressure of 4 MPa, an irradiated ampoule volume as large as 80 cm3, and three lines of protection, the target was able to liquefy up to 40 L of a hydrogen-isotope mixture and maintain a temperature in the range of 20−22 K with an accuracy of ±0.05 K or better. Based on the results of the ptμ‑fusion experiments, the reaction channel with the emission of electron−positron pairs was detected for the first time and evidence for the existence of a new reaction channel with the emission of a pair of γ-ray photons was obtained.

We present R&D results of the preparation project for the experimental measurement of the (anti)neutrino magnetic moment at the level of 10(-12) mu(B) using an intense tritium source of antineutrinos and liquid helium target.

The article presents results of comparative tests for determination of deuterium fluxes permeating through walls of austenitic stainless steel AISI304 (DIN 1.4301) chamber and Al2O3 based ceramic F99.7 chamber. Both chambers represent a piece of empty set26x empty set22x117 mm(3) tube with spherical bottom ending. It is shown that at 773 K and deuterium pressure of 1200 mbar the permeated deuterium flux through the stainless steel chamber constituted 8.10(-5)cm(3)/s, while the flux through ceramic one it did not exceed the sensitivity of the measurement method threshold, namely similar to 1.5.10(-7)cm(3)/s. The ceramic chamber turned out to survive more than 10(3) cycles of heating up to 773 K with no damages. It did not lose its impermeability up to 10 bar of internal deuterium pressure. The authors also present test results of a prototype bed for reversible tritium storage. The bed's case was made of alumina based ceramic F99.7, titanium being used as tritide making metal and high frequency induction used for heating of tritide metal.

A search for the muon-catalyzed fusion reaction d + d -> He-4 + gamma in the dd mu muonic molecule was performed using the experimental installation TRITON with BGO detectors for gamma-quanta. A high-pressure target filled with deuterium was exposed to the negative muon beam of the JINR Phasotron to detect gamma-quanta with the energy 23.8 MeV. An experimental estimation for the yield of radiative deuteron capture from the dd mu state J = 1 was obtained at the level of eta(gamma) <= 8 x 10(-7) per fusion.

A search for the muon-catalyzed fusion reaction d + d → 4He + γ in the ddμ muonic molecule was performed using the experimental installation TRITON with BGO detectors for γ-quanta. A high-pressure target filled with deuterium was exposed to the negative muon beam of the JINR Phasotron to detect γ-quanta with the energy 23.8 MeV. An experimental estimation for the yield of radiative deuteron capture from the ddμ state J = 1 was obtained at the level of η γ ≤ 8 × 10−7 per fusion.

Experimental results on the average heat transfer from a cylinder in a liquid-penetrated granular bed are presented and the dependence of the heat transfer rate on the particle size in the bed is found.