Investigations of three-, four-, and five-particle decay channels of levels in light nuclei created using a C9 beam

R. J. Charity, J. M. Elson, J. Manfredi, R. Shane, L. G. Sobotka, B. A. Brown, Z. Chajecki, D. Coupland, H. Iwasaki, M. Kilburn, Jenny Lee, W. G. Lynch, A. Sanetullaev, M. B. Tsang, J. Winkelbauer, M. Youngs, S. T. Marley, D. V. Shetty, A. H. Wuosmaa, T. K. Ghosh, and M. E. Howard
Phys. Rev. C 84, 014320 – Published 20 July 2011

Abstract

The interactions of an E/A=70-MeV C9 beam with a Be target was used to populate levels in Be, B, and C isotopes, which undergo decay into many-particle exit channels. The decay products were detected in the HiRA array and the level energies were identified from their invariant mass. Correlations between the decay products were examined to deduce the nature of the decays, specifically to what extent all the fragments were created in one prompt step or whether the disintegration proceeded in a sequential fashion through long-lived intermediate states. In the latter case, information on the spin of the level was also obtained. Of particular interest is the five-body decay of the C8 ground state, which was found to disintegrate in two steps of two-proton decay passing through the Be6g.s. intermediate state. The isobaric analog of C8g.s. in B8 was also found to undergo two-proton decay to the isobaric analog of Be6g.s. in Li6. A 9.69-MeV state in C10 was found to undergo prompt four-body decay to the 2p + 2α exit channel. The two protons were found to have a strong enhancement in the diproton region and the relative energies of all four p-α pairs were consistent with the Li5g.s. resonance.

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  • Received 5 May 2011

DOI:https://doi.org/10.1103/PhysRevC.84.014320

©2011 American Physical Society

Authors & Affiliations

R. J. Charity, J. M. Elson, J. Manfredi, R. Shane, and L. G. Sobotka

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

B. A. Brown, Z. Chajecki, D. Coupland, H. Iwasaki, M. Kilburn, Jenny Lee, W. G. Lynch, A. Sanetullaev, M. B. Tsang, J. Winkelbauer, and M. Youngs

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

S. T. Marley, D. V. Shetty, and A. H. Wuosmaa

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

T. K. Ghosh

  • Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India

M. E. Howard

  • Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA

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Issue

Vol. 84, Iss. 1 — July 2011

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