New study of the neutron rich 136Te isotope through decay spectroscopy

Min Si,Radomira Lozeva,W Liu,B Guo,Y Wang,S Zeng,X Tang

doi:10.1051/epjconf/202226011018

Abstract

136Sb is a neutron rich nucleus with one valence proton and three valence neutrons outside the doubly-magic nucleus 132Sn. It plays an important role in the rapid neutron capture process (r-process) as participates in its path further connected to the nucleosynthesis and the type II supernovae. In this work, a new β decay γ ray data on 136Te is obtained. The experiment is performed at the Institute Laue-Langevin using the Lohengrin spectrometer and the thermal neutron-induced fission reaction on $_{92}^{235}{{\rm{U}}_{143}}$. A specific β-β condition method is investigated for the γ-ray detection.

Highlights

The rapid neutron capture process (r-process) represents series of important nuclear reactions preformed at neutron-rich region in nuclear chart, responsible for creating about half of the elements heavier than iron
The 136Te isotopes reveal structure dominated by pairs of valence protons and neutrons above the 132Sn core and nuclei in this neutron-rich region are mostly produced by fission reactions or the β decay of fission products [1]
The fission productions go through the LOHENGRIN separator and are selected by the magnetic and electric field according to their mass (A) over ionic charge (q) ratio and kinetic energy (Ek) over ionic charge (q)

Summary

Introduction

The rapid neutron capture process (r-process) represents series of important nuclear reactions preformed at neutron-rich region in nuclear chart, responsible for creating about half of the elements heavier than iron. Nuclei around 132Sn play a significant role in r-process, their nuclear structure properties, such as mass (A), half life (T1/2), β delayed neutron emissions Pn and P2n values, are essential to reproduce the r-process abundances and help us to understand the origin of the elements in our universe. The 136Te isotopes reveal structure dominated by pairs of valence protons and neutrons above the 132Sn core and nuclei in this neutron-rich region are mostly produced by fission reactions or the β decay of fission products [1]. The previous study about β decay of 136Sb is incomplete [2], the γ ray spectrum of 136Te from β decay of the mother 136Sb isotope is investigated here

Experiment

Data analysis

Result

Summary