Rotational J"1PJ"0 transitions in (He h) ( muonic molecular ions (where He and h are helium and hydrogen isotopes, respectively), induced by external Auger process in collision with hydrogen isotope atoms are considered. The obtained reaction rates, normalized to liquid hydrogen density, range between 3.4 · 10s\ and 11.2 · 10s\ for different isotope combinations. Rotational state populations of He h in hydrogen isotope-helium mixtures are also calculated.

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Radiative, Auger and predissociation decay modes of muonic lithium-hydrogen molecule, Liµh, (h = p, d or t is a hydrogen isotope) are considered. Results obtained for the corresponding reaction rates indicate that predissociation is a dominating decay mode for h = p, d while Auger decay dominates for h = t. The calculated conversion coefficient is significantly larger than that for helium muonic molecule and ranges between 37 and 42 (on the basis of one electron) depending on isotope composition of the molecule. Reaction rates for rotational 1 → 0 transitions in Liµh and Heµh due to inner Auger process are also calculated.

Experimental results on measurement of dd-reaction cross sections in the energy range of 0.1–1.5 keV using the Z-pinch technique are presented. The experiment was fulfilled at the high current generator of the High-Current Electronics Institute, city of Tomsk, Russia. The dd-fusion neutrons were registered by time-of-flight scintillator detectors and BF3 detectors of thermal neutrons. The estimates were obtained at 90% of the confidence level for the upper limits of the neutron-producing dd-reaction cross sections for average deuteron collision energies of 0.11, 0.34, 0.37, and 1.46 keV. These results substantiate feasibility to get a cross section magnitude for dd-reaction in the range of the collision energy of 0.8–3 keV using similar technology at the pulse current level of 2–3 MA.

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