NEW OBSERVATIONS OF STIMULATED-EMISSION OF MOSSBAUER RADIATION IN ISOMERIC TRANSITIONS TE-125M2-]TE-125M1-123M2-]TE-123M1+HV(88.46 KEV)(HV(109.3 KEV) AND TE)

A sample of (BeTe)-Te-125m2 containing (4.9 +/- 1.5). 10(18) atoms/cm( 3) of Te-125m2 was obtained in a reactor by neutron activation of poly crystalline beryllium telluride (BeTe)-Te-124. The ratio of the number of 109.27 keV photons emitted in the Te-125m2 + hv -->Te-125m1 + 2hv transition due to attainment of the Mossbauer conditions (at T = 10 K) to the total number of photons produced in the sample at T = 300 K wa s measured to be epsilon(exp) = Delta Phi(gamma)/Phi(gamma) = 0.0045 /- 0.0030. Independent measurements of the intensity of the two-photon 218.54 keV line at 10 K in the same sample yielded a value of 0.0023 +/- 0.0004 for epsilon(exp). Under the conditions of our experiment in the moving-wave approximation (i.e. in the framework of non-stationar y optics) the theory predicts the value epsilon(theor) = B-coh(10 K)/B -non-coh (300 K) = 0.0018 +/- 0.0006 for the ratio of the superemissio n power of Te-125m(2) nuclei at 10 K B-coh to the normal spontaneous e mission power of these nuclei at 300 K B-non-coh. This value within th e error coincides with epsilon(exp). The stimulated Mossbauer transiti on Te-123m2 + hv(88.46 keV) --> Te-123m1 + 2hv(88.46 keV) in a polycry stalline sample of Mg-3 TeO6 containing (3.4 +/- 0.7). 10(19) atoms/cm (3) of Te-123m2 was also experimentally studied. The measured value ep silon(exp) = (5 +/- 3). 10(-4) for this transition within the error co incides with a theoretical value epsilon(theor) = 0.00023 obtained in the moving-wave approximation.