# Characterization of vorticity in pygmy resonances and soft-dipole modes with two-nucleon transfer reactions

## TL;DR

This paper investigates the vorticity characteristics of pygmy resonances and soft-dipole modes in nuclei using two-nucleon transfer reactions, providing new insights into their particle-particle components and comparing theoretical predictions with experimental data.

## Contribution

It introduces a detailed analysis of two-nucleon transfer reactions to characterize pygmy resonances and soft-dipole modes, emphasizing particle-particle components and improving cross section calculations.

## Key findings

- Reproduces experimental cross sections within 10% accuracy.
- Predicts absolute cross sections for the $^9$Li$(t,p)^{11}$Li(1$^-$) reaction.
- Highlights the importance of transfer mechanisms and non-orthogonality corrections.

## Abstract

The properties of the two-quasiparticle-like soft E1-modes and PDR have been and are systematically studied with the help of inelastic and electromagnetic experiments which essentially probe the particle-hole components of these vibrations. It is shown that further insight in their characterisation can be achieved with the help of two-nucleon transferreactions, in particular concerning the particle-particle components of the modes, in terms of absolute differential cross sections which take properly into account successive and simultaneous transfer mechanisms corrected for non-orthogonality, able to reproduce the experimental findings at the 10% level. The process $^9$Li$(t,p)^{11}$Li(1$^-$) is discussed, and absolute cross sections predicted.