The Dergaon meteorite was collected in 2001 from Dergaon, Assam, India. It is classified as H5Chondrite. Elemental abundance ratios are obtained in an analysis done by P.N. Shuklaet al in 2005. Here Xe 129 which should be ubiquitous in meteorite is not reported, while rests of Xe isotopes are there. We have taken the abundance of isotope in the proportion of universal ratio. This comes 9 Xe 129=8.58 when Xe 132 =100. The whole Xe 129might be due to in situ decay |129 in sample. The time interval between formation of solar system and formation of meteorite is indeed crucial in that time when meteorite material becomes a closed system with no nuclear process, only beta decay can take place. In this paper we are representing only s-process nucleosynthesis, cosmic ray contribution and nuclear reaction occurring in presence of magnetic field to study Dergaon meteorite.