V. I. Silaev

Parameters of charged-particle tracks in the P-type nuclear emulsion

TheZ2/β2 parameter (Z is the charge and β is the particle velocity in terms of the light velocity) for protons, α-particles, and nuclei was measured in the P-type nuclear emulsion with an optical microscope and the MAC-1 semiautomatic system. TheZ2/β2 measurement range was extended to the value β=0.1. The results obtained with the MAC-1 system and the visual processing methods agree up toZ=ZSi Tracks of up to Au nuclei can be investigated now with the MAC-1 system.

On the possibility of observing low-intensity spectral lines of internal conversion electrons using the MAC-1 setup

Results of upgrading of MAC-1 setup components are described. It is shown that the optimum conditions for detection of low-intensity spectral lines are ensured by the high sensitivity of the instrument to gradations of photoemulsion blackening and by the high resolution of the optoelectronic channel that forms the image of emulsion grains, in combination with the possibility of varying the spectrogram scanning modes, which has been provided by the upgrading. The upgrading of the instrument opens up new avenues for spectroscopy of internal conversion electrons if sufficient statistics is acquired in an experiment. The efficiency of the proposed procedures is demonstrated by the example of extraction of low-intensity K672.35 160Dy and K673.09 160Dy lines in a spectrogram of internal conversion electrons from erbium fractions.

Calibration of a Shower Detector with Nuclear Emulsion in an Electron Beam

The production of electron–photon showers in the shower detector was investigated. The detector is composed of alternating layers of nuclear emulsion and lead with a total thickness of 2.95 radiation units for exposure to a 10-GeV electron beam. By using experimental results, it is possible to identify electrons in the shower detector with a high efficiency.

A Technique for Measuring Beta-Spectrograms on a МАС-1 Universal Setup

Methods for processing the photographic spectrograms of internal-conversion electrons are considered. The spectograms were obtained on a beta-spectrograph for rare-earth elements isotopes with the use of a precision TV image-reading system designed in 2000 for the MAC-1 setup.

Cascade multiplication of a 26-GeV electron shower in a lead plate-emulsion sandwich chamber

The electron-photon shower development in a lead plate-emulsion sandwich chamber with a total effective lead thickness of 3.5 radiation units was studied for an electron energy of 26 GeV. The experimental electron multiplication coefficient (Pexp=19.4±1.4) agrees with a theoretical value (Pcalcd=20.4) calculated with corrections for the particle scattering and absorption.