Abstract

The main goal of this work is to study the structure of the highest energy states in 8Be populated following the β+-decay and the electron capture (EC) of 8B. With this aim, two experiments were performed at ISOLDE-CERN in 2017 and 2018. The first experiment had the aim to resolve the 2+ doublet at 16.6 and 16.9 MeV, in order to study their isospin mixing. The second experiment aimed to determine a value or give an experimental upper limit to the branching ratio of the exotic EC-p decay.In this paper, we present the experimental setups and we discuss the analysis and present the preliminary results obtained so far.

Highlights

  • The 8B nucleus is interesting both from astrophysics and nuclear structure point of view

  • The β+-decay of the 8B is the main source of solar neutrinos above 2 MeV, the shape of the β+/electron capture (EC)-decay α-spectrum has been studied in detail in numerous occasions

  • The interest of the present study focuses on the 8B nuclear structure and the study of the population to high excited states in the daughter 8Be

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Summary

Introduction

The 8B nucleus is interesting both from astrophysics and nuclear structure point of view. As far as is known the 8B decay by allowed transitions to the 2+ states in 8Be that break into two alphas (see figure 1). The β+-decay of the 8B is the main source of solar neutrinos above 2 MeV, the shape of the β+/EC-decay α-spectrum has been studied in detail in numerous occasions (see reference in [1] and reference therein).

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