ISSN:
1573-8205
Source:
Springer Online Journal Archives 1860-2000
Topics:
Energy, Environment Protection, Nuclear Power Engineering
,
Physics
Notes:
Summary The time-of-flight neutron spectrometer used with the cyclotron opens up broad new possibilities of use of the cyclotron for the study of nuclear reactions. We shall enumerate several of them. The efficiency of the spectrometer can be brought up to several tens of percent, which permits the study with existing neutron fluxes of secondary processes (for example, the spectra of scattered neutrons entirely free from the background of γ-rays produced in the target. The spectrometer gives the possibility of studying neutron spectra on a background of harder and more intense groups, thanks to which the first works on the study of neutron spectra [20,21] already gave new physical results. The use of several counters, connected in the spectrometer circuit and in coincidence circuits with each other, allows the study of neutron spectra accompanied by a definite secondary particle, and also of the angular correlations of particles emitted by the target (for example, the angular correlation of γ-quanta with neutrons of definite energy). The difficulties encountered in the work are mostly connected with instability of the cyclotron. The taking of a spectrum with the existing one-channel circuit requires about an hour. During this time, the phase of ejection of the particles from the cyclotron may change relative to the HF phase because of a change of some of its parameters, and this seriously damages the accuracy of the measurements. In work with deuterons, there are rather large backgrounds of neutrons and γ-rays produced outside the target. These may be taken into account by making difference measurements (target — “flag”), since the counting rate is sufficiently high. But the instability of the cyclotron makes the backgrounds variable, which decidedly decreases the reliability of the procedure. To increase the accuracy of the results obtained with the spectrometer, we are now conducting work in two directions: stabilization of the cyclotron and construction of a multichannel circuit.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01516315
Permalink
