The $^{135}$Cs(n,$\gamma$) cross section at 30 and 500 keV

The neutron capture cross section of the unstable isotope $^{135}$Cs was measured relative to that of gold by means of the activation method. The sample was produced by ion implantation in a high resolution mass separator and irradiated with quasi-monoenergetic neutrons at 30 keV and 500 keV, using the $^{7}$Li(p,n)$^{7}$Be reaction. After the irradiations at the above energies, one more irradiation with thermal neutrons was used for defining the sample mass and for measuring the half-life of $^{136}$Cs. The neutron capture cross section was determined as 164 $\pm$ 10 mbarn and 34.8 $\pm$ 3.0 mbarn at 30 keV and 500 keV, respectively, and were used to normalize the theoretically derived cross section shape.

Analogies of genetic and chemical code. Supplement 1

In the original work, for which this is a Supplement, I presented analogies of the genetic and chemical code (Rakočević 2018b, in relation to the source work from 1991). (Further: instead of "Rakočević" I use the abbreviation "MMR".) There I gave three Tables of the Periodic System of the Elements (PSE) in which I dealt with the problem of stable and unstable elements; in the sense that an unstable element is one that possesses at least one primordially unstable isotope, while elements that do not possess such isotopes are stable. I have shown that for the number of stable and the number of unstable elements there are strict regularities and a strict law; the same law that is valid for the association of codons to more complex and to less complex amino acids in the genetic code. I have not dealt with the question of the number of stable and the number of unstable isotopes, what I do now in this Supplement. [An expanded version of the original paper whose Supplement this is: OSF Preprint DOI 10.31219/osf.io/mxecj]

Tritium in Amorphous Silicon

Preliminary results on infrared and luminescence measurements of tritium incorporated amorphous silicon are reported. Tritium is an unstable isotope that readily substitutes hydrogen in the amorphous silicon network. Due to its greater mass, bonded tritium is found to introduce new stretching modes in the infrared spectrum. Inelastic collisions between the beta particles, produced as a result of tritium decay, and the amorphous silicon network, results in the generation of excess electron-hole pairs. Radiative recombination of these carriers is observed.