Abstract
The work is devoted to the study of spectral, temporal and generation characteristics of plasma generated in dense gas mixtures by the products of neutron nuclear reaction 235U(n, f). This plasma differs in its properties from the discharge plasma, as has the track structure and low temperature of electrons, and the presence in gas mixtures of electronegative gas can become without electrons. On the basis of such nuclear-excited plasma excimer gas lasers with the nuclear pumping, carrying out direct transformation of nuclear energy to the laser radiation UV range of lengths of waves, can be created. We found out high efficiency of formation of excimer molecules of XeCl* in dense (~ 760 Торр) Ar - Xe - CCl 4 of gas mixture with low (~ 1015 mol/cм3) concentration of CCl4 at the nuclear pumping. Here we report the first clear observation of super-radiance at 352 nm on C-A transition of excimer molecule XeCl* excited solely by nuclear pumping Ar-Xe-CCl4 gas mixture at a pressure of 760 Torr with a low concentration of CCl4 (0.15Torr). The mixture was excited by products of neutron nuclear reaction 235U(n,f) pumped at a rate of 2kW/cm3. A laser cell with a length of 100cm was placed inside an optical resonator tuned at 352 nm. Super-radiance had a very sharp increase and low neutron threshold (about 2÷4.1014 neutron/cm2. s) when we used the tuning resonator at 352 nm wavelength with 10.8% reflection of output and 62.1% reflection of back spherical mirrors, and super-radiance disappeared if the laser output mirror was replaced by a quartz window.
Highlights
Super-radiance emission at 352 nm on the C-A transition XeCl* excimer molecule was observed in a nuclear-excited plasma for the first time
For the gas mixture 3He-Хe-NF3 excited by the products of the nuclear reaction 3He(n, p)3T, the gain was measured at a specific pumping power of 5 kW /cm3 and amounted to ~ 7.10-3 cm-1 [3], and when pumping a Ne(Ar) -Xe-NF3 gas Aleksey Iustinovich Mis’kevich et al.: The Effect of Super-Radiance on the C-A Transition of the Excimer Molecule
Strong super- radiance emission was obtained at 352nm on the C-A transition of an excimer molecule XeCl*
Summary
Super-radiance emission at 352 nm on the C-A transition XeCl* excimer molecule was observed in a nuclear-excited plasma for the first time. Halogen and xenon-containing mixtures excited by products of nuclear reactions allow to receive UV light emission with high (more than 10%) efficiency on B-X or CA transitions of XeF*, XeCl*, XeBr* and XeI* excimer molecules at the wavelengths of 351nm, 308nm, 282nm and 253nm respectively. For the gas mixture 3He-Хe-NF3 excited by the products of the nuclear reaction 3He(n, p)3T, the gain was measured at a specific pumping power of 5 kW /cm and amounted to ~ 7.10-3 cm-1 [3], and when pumping a Ne(Ar) -Xe-NF3 gas Aleksey Iustinovich Mis’kevich et al.: The Effect of Super-Radiance on the C-A Transition of the Excimer Molecule
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