Constraints on the spectra of 17,19C

TL;DR

This study combines shell model estimates and multichannel algebraic scattering theory to investigate the spectra of exotic 17,19C ions, providing insights into their structure and reaction cross sections.

Contribution

It introduces a combined approach using shell model and MCAS theory to analyze the spectra and reaction properties of 17,19C, which is novel for these exotic nuclei.

Findings

Shell model assumptions are reasonable with minimal effective charge adjustments.

Two excited states are close to the ground state, constraining structural models.

Additional positive parity states are predicted in low-lying spectra.

Abstract

Diverse means are used to investigate the spectra of the radioactive, exotic ions, 17,19C. First, estimates have been made using a shell model for the systems. Information from those shell model studies were then used in evaluating cross sections of the scattering of 70A MeV 17,19C ions from hydrogen. Complementing those studies, a multichannel algebraic scattering (MCAS) theory for n+16,18C coupled-channel problems has been used to identify structures of the compound systems. The results show that the shell model structure assumed for these ions is reasonable with little need of effective charges. The conditions that two excited states exist within a few hundred keV of the ground state places some restriction upon the structure models. Other positive parity states are expected in the low-lying spectra of the two nuclei.