# From chiral NN(N) interactions to giant and pygmy resonances via extended RPA

## TL;DR

This paper investigates the predictive capabilities of modern chiral nuclear interactions, including three-nucleon forces, in describing giant and pygmy resonances in calcium isotopes using an extended RPA approach.

## Contribution

It introduces an extended RPA method to analyze nuclear resonances starting from chiral Hamiltonians, emphasizing the role of three-nucleon forces.

## Key findings

- Improved description of giant resonances in 40,48Ca isotopes.
- Enhanced low-energy dipole response predictions.
- Comparison shows advantages over previous Argonne V18-based results.

## Abstract

The properties of giant and pygmy resonances are calculated starting from chiral two-and three-nucleon interactions. The aim is to assess the predictive power of modern Hamiltonians and especially the role of the three-nucleon force. Methods based on the random-phase approximation (RPA) provide an optimal description of the modes of interest with minimal computational requirements. Here we discuss the giant resonances (GRs) of 40,48Ca isotopes and their low-energy dipole response. A comparison with previous results obtained with a transformed Argonne V18 two-nucleon potential points to certain improvements.