Faculty of Engineering, Cairo University, Cairo , Egypt
This work presents a criterion to test the theoretical nuclear matrix element of ββ decaymodes for the isotopes128,130Te. The test has been carried out for the 0νββ decay mode by
using different techniques with small and large basis of the Hilbert space. The lowest values
of the mean deviation from the criterion used in that test are: 1.915%, 1.603% for small and
large basis. These results belong to full-RQRPA and Pn RQRPA techniques respectively.
The total decay rates ratio of 128,130Te is determined theoretically from this work and
experimentally from different laboratories by geochemical technique. The theoretical and
experimental results of such ratio are consistent. In this set of results, the most precise one is
the theoretical total decay rates ratio 2520.828 ± 329.395. This result is calculated in this
work by using Pn RQRPA technique with large basis.