# The optimal detection angles for producing N=126 neutron-rich isotones in the multinucleon transfer reactions

## TL;DR

This paper investigates optimal detection angles for neutron-rich N=126 isotones produced in multinucleon transfer reactions, proposing a method to determine the best angles for experimental detection based on theoretical modeling.

## Contribution

It introduces a method to identify optimal detection angles for N=126 isotones in multinucleon transfer reactions using the DNS-sysu model, aligning with experimental data.

## Key findings

- Optimal detection angle range is 45° to 50° in lab frame.
- Angular distribution depends on isospin and impact parameter.
- Predicted angles can aid future experimental detection of N=126 isotones.

## Abstract

The challenge of isotopic identification over a wide angular distribution has limited the measurement of neutron-rich nuclei produced via the multinucleon transfer (MNT) process. To investigate the optimal detection angles for the N=126 isotones, we propose a method to construct the reasonable scattering angles of the MNT products in the dinuclear system (DNS-sysu) model. The reactions $^{136,144}$Xe + $^{208}$Pb are investigated. The calculated results are in rather good agreement with the available experimental data in the reaction $^{136}$Xe + $^{208}$Pb. The entrance channel effects on the scattering angle are investigated. It is found that the scattering angular distribution strongly depends on the isospin and the impact parameter of the collision system. The optimal angle ranges for detecting $N=126$ neutron-rich nuclides $^{204}$Pt, $^{203}$Ir, $^{202}$Os, and $^{201}$Re in the $^{136}$Xe + $^{208}$Pb reaction at the incident energy $E_{c.m.} = 526MeV$ are predicted. Our results suggest that the angle range $45^{\circ} \leqslant \theta_{\mathrm{lab}} \leqslant 50^{\circ}$ is most favorable for detecting unknown N=126 isotones. Given the current difficulties in separating and identifying experimental MNT fragments, the results of this work could provide significant contributions to future experiments.