Fragmentation of the IAR along the chains $ \boldsymbol{N=50} $ and $ \boldsymbol{Z=50} $

TL;DR

This study investigates the fragmentation of Isobaric Analog Resonances in N=50 isotones using advanced nuclear models, revealing how pairing effects cause Fermi strength fragmentation and collective mode contributions.

Contribution

It combines HFB and QRPA calculations with Gogny D1M interaction to analyze Fermi transition probabilities and resonance fragmentation in N=50 isotones, highlighting pairing effects.

Findings

Fragmentation of Fermi strength is linked to fractional occupation of nucleon shells.

Collective modes contribute to the interpretation of Fermi transition mechanisms.

Theoretical Fermi transition probabilities support the role of pairing in resonance fragmentation.

Abstract

We study Isobaric Analog Resonances in even-even nuclei along the $ N=50 $ isotonic chain. First, Hartree-Fock-Bogoliubov calculations, using the Gogny D1M effective interaction, have been performed to provide energies and occupation probabilities of nucleon orbitals. The Isobaric Analog Resonances are calculated with the charge exchange QRPA approach on top of then HFB calculations. Fermi transition mechanism is interpreted with the existence of collective modes in the final nucleus. The fragmentation of the Fermi Strength results from the fractional occupation of nucleon shells, a direct consequence of nuclear pairing. The theoretical Fermi transition probabilities along the isotopic chain $ Z=50 $ are also analyzed and confirm our conclusions.