E.V. Tkalya

Proposal for a Nuclear Gamma-Ray Laser of Optical Range

A possibility of the amplification of the 7.6 eV γ radiation by the stimulated γ emission of the ensemble of the (229m)Th isomeric nuclei in a host dielectric crystal is proved theoretically. This amplification is a result of (1) the excitation of a large number of (229m)Th isomers by laser radiation, (2) the creation of the inverse population of nuclear levels in a cooled sample owing to the interaction of thorium nuclei with the crystal electric field or with an external magnetic field, (3) the emission or absorption of the optical photons by thorium nuclei in the crystal without recoil, and (4) the nuclear spin relaxation through the conduction electrons of the metallic covering.

Nuclear excitation in atomic transitions (NEET process analysis)

Abstract The paper is devoted to a detailed analysis of the process of nuclear excitation in atomic transitions. All calculations are carried out within the framework of QED. A comparison with experimental results on nuclear excitation of 189 Os, 197 Au and 237 Np is made. The substantial difference between observed probabilities and theoretical estimates is revealed. The possibility of a direct experimental measurement of NEET probability is discussed.

Matrix element of the anomalously low-energy (3.5±0.5 eV) transition in 229Th and the isomer lifetime

The matrix element of the anomalously low-energy (3.5±0.5 eV) nuclear M1 transition between the first excited state and the ground state of the 229Th nucleus is determined with allowance for the Coriolis mixing of the rotational bands. The upper and lower limits on the lifetime of the level with respect to an isomeric transition are given. A method is proposed for measuring the half-life of the low-lying isomer 229mTh directly in a 233U sample.

Radiative lifetime and energy of the low-energy isomeric level in 229Th

We estimate the range of the radiative lifetime and energy of the anomalous, low-energy

Excitation and decay of low-lying nuclear states in a dense plasma produced by a subpicosecond laser pulse

3/{2}^{+}(7.8\ifmmode\pm\else\textpm\fi{}0.5

Excitation of tantalum-181 nuclei in a high-temperature femtosecond laser plasma

eV) state in the

Excitation of nuclei in a hot, dense plasma: Feasibility of experiments with 201Hg

^{229}\mathrm{Th}

Theoretical study of molecular electronic excitations and optical transitions of C60

nucleus. Our phenomenological calculations are based on the available experimental data for the intensities of

Theory of the nuclear excitation by electron transition process near the K edge

M1

Alpha decay of the first excited state of the Th-229 nucleus

and