Delayed neutron emission near the shell-closures

Ivan Borzov

doi:10.1051/epjconf/201610706002

Abstract

The self-consistent Density Functional + Continuum QRPA approach (DF+CQRPA) provides a good description of the recent experimental beta-decay half-lives and delayed neutron emission branchings for the nuclei approaching to (and beyond) the neutron closed shells N = 28; 50; 82. Predictions of beta-decay properties are more reliable than the ones of standard global approaches traditionally used for the r-process modelling. An impact of the quasi-particle phonon coupling on the delayed multi-neutron emission rates P2n, P3n,… near the closed shells is also discussed.

Highlights

The β-decay half-lives and β-delayed neutron emission probabilities of very neutron-rich nuclei are of great value for nuclear structure theory
An impact of the quasi-particle phonon coupling on the delayed multi-neutron emission rates P2n, P3n, ... near the closed shells is discussed
The main features of the β-decay and multineutron emission rates are described for the isotopes near the magic shell-closures in the neutron-rich sector

Summary

Introduction

The β-decay half-lives and β-delayed neutron emission probabilities of very neutron-rich nuclei are of great value for nuclear structure theory. A substantial amount of more precise β-decay data on the fission and fragmentation products are expected to come from the acting radioactive beam facilities: ISOLDE-CERN, ALTO, RIKEN, TRIUMF, NSCL, as well as constructed FAIR, Spiral-2, HIE-CERN facilities An importance of this field has been stated in the IAEA Project of creating new data base of the beta-decay and delayed neutron emission rates [1]. It will acquire accurate experimental data and theoretical predictions for nuclides beyond the reach of existing or planned facilities. The fully microscopic models are of a special importance, as they ensure more reliable extrapolation of nuclear data to extreme N/Z ratios

Theoretical background

Results

Summary