Invariant-mass spectroscopy of Ne18, O16, and C10 excited states formed in neutron-transfer reactions

R. J. Charity, K. W. Brown, J. Elson, W. Reviol, L. G. Sobotka, W. W. Buhro, Z. Chajecki, W. G. Lynch, J. Manfredi, R. Shane, R. H. Showalter, M. B. Tsang, D. Weisshaar, J. Winkelbauer, S. Bedoor, D. G. McNeel, and A. H. Wuosmaa
Phys. Rev. C 99, 044304 – Published 9 April 2019

Abstract

Neutron-transfer reactions with fast secondary beams of Ne17, O15, and C9 have been studied with the HiRA and CAESAR arrays. Excited states of Ne18, O16, and C10 in the continuum have been identified using invariant-mass spectroscopy. The best experimental resolution of these states is achieved by selecting events where the decay fragments are emitted transverse to the beam direction. We have confirmed a number of spin assignments made in previous works for the negative-parity states of Ne18. In addition we have found new higher-lying excited states in O16 and Ne18, some of which fission into two ground-state Be8 fragments. Finally for C10, a new excited state was observed. These transfer reactions were found to leave the remnant of the Be9 target nuclei at very high excitation energies and may be associated with the pickup of a deeply bound Be9 neutron.

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  • Received 2 October 2018

DOI:https://doi.org/10.1103/PhysRevC.99.044304

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

R. J. Charity, K. W. Brown, J. Elson, W. Reviol, and L. G. Sobotka

  • Departments of Chemistry and Physics, Washington University, St. Louis, Missouri 63130, USA

W. W. Buhro, Z. Chajecki*, W. G. Lynch, J. Manfredi, R. Shane, R. H. Showalter, M. B. Tsang, D. Weisshaar, and J. Winkelbauer

  • National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

S. Bedoor

  • Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA

D. G. McNeel and A. H. Wuosmaa

  • Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA and Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA

  • *Present address: Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA.

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Issue

Vol. 99, Iss. 4 — April 2019

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