Single-nucleon knockout cross sections for reactions producing resonance states at or beyond the drip line

Charity, R. J.; Sobotka, L. G.; Tostevin, J. A.

doi:10.1103/physrevc.102.044614

Single-nucleon knockout cross sections for reactions producing resonance states at or beyond the drip line

Journal Article · Tue Oct 20 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.044614· OSTI ID:1684621

^[1]; ^[2]; Tostevin, J. A. ^[3]

Washington Univ., St. Louis, MO (United States); Washington University, St. Louis Missouri 63130
Washington Univ., St. Louis, MO (United States)
Univ. of Surrey (United Kingdom)

Single-nucleon knockout cross sections from fast secondary beams of the proton-drip-line nuclei ⁹C, ¹³O, and ¹⁷Ne on a ⁹Be target have been studied with emphasis on the production of resonance states. These states were identified by their invariant mass, and resonances with two-, three-, and five-body exit channels were examined. The measured cross sections for these states were compared with eikonal-model predictions using shell-model or variational Monte Carlo spectroscopic factors. The experimental yields were found to be suppressed relative to the model predictions, especially when a well-bound neutron or proton is removed. This suppression exceeds that found systematically in measured inclusive cross sections to particle-bound final states. In neutron knockout from ⁹C and ¹³O projectiles, this suppression of the unbound ground-state residuals yield is a factor of two to three times larger than that found in the bound final-state studies. Modifications to the structure of these systems due to coupling of the shell-model configurations to the continuum is expected to contribute to this extra suppression, especially when the final state is a near-threshold resonance. Furthermore, other considerations including the role of nuclear dynamics may be required to explain all the observed trends.

View Accepted Manuscript (DOE)

Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: Science and Technology Facilities Council (UK); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-87ER40316

OSTI ID:: 1684621

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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