On the reliability of the theoretical internal conversion coefficients

Possible sources of uncertainties in the calculations of the internal conversion coefficients are studied. The uncertainties induced by them are estimated.Comment: 16 pages (including 3 figures inserted by 'epsfig' macro

Finite density QCD sum rules for nucleons

It is shown how the QCD sum rules can be applied for the investigation of the density dependence of the nucleon parameters. These characteristics can be expressed through the expectation values of QCD operators in nuclear matter. In certain approximations the expectation values are related to the observables. First applications of the approach reproduced some of the basic features of nuclear physics, providing also a new knowledge. The program of the future work is presented. The difficulties of the approach are discussed.Comment: 22 pages, Lecture at the International School on Nuclear Physics, Erice,200

QCD condensates and hadron parameters in nuclear matter: self-consistent treatment, sum rules and all that

We review various approaches to the calculation of QCD condensates and of the nucleon characteristics in nuclear matter. We show the importance of their self-consistent treatment. The first steps in such treatment appeared to be very instructive. It is shown that the alleged pion condensation anyway can not take place earlier than the restoration of the chiral symmetry. We demonstrate how the finite density QCD sum rules for nucleons work and advocate their possible role in providing an additional bridge between the condensate and hadron physics.Comment: 67 pages, LaTeX, 15 figures, epsfig.sty; to be published in "Progress in Particle and Nuclear Physics", vol.47, is.

Double Beta Decay: Historical Review of 75 Years of Research

Main achievements during 75 years of research on double beta decay have been reviewed. The existing experimental data have been presented and the capabilities of the next-generation detectors have been demonstrated.Comment: 25 pages, typos adde

The level structure of the nucleus 140Ce

Precision energy measurements on 24 gamma-ray lines in the 140La --> 140Ce decay were performed with a 2 m curved-crystal spectrometer and a lithium-drifted germanium spectrometer. The relative intensities of 15 gamma rays were determined. A level scheme for 140Ce is proposed with the inclusion of two new levels at 2516.14 and 2547.5 keV. The new level scheme is compared with recent calculations using the quasi-particle description.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33415/1/0000816.pd

L'analyse du phénomène de production des positrons monoénergétiques

Formulas for the coefficients of conversion with the formation of positrons with single energy have been obtained for different kinds of radiations and their analysis has been carried out. The question has been examined of the possibility of using the formation of positrons with single energy to determine the width of nuclear levels with energies of excitation of 1-6 MeV