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Phys. Rev. Lett. 74, 860–863 (1995)

Two-Proton Emission from the Ground State of 12O

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R. A. Kryger1, A. Azhari1,2, M. Hellström1, J. H. Kelley1,2, T. Kubo1,*, R. Pfaff1, E. Ramakrishnan1,2, B. M. Sherrill1,2, M. Thoennessen1,2, S. Yokoyama1,2, R. J. Charity3, J. Dempsey3, A. Kirov3, N. Robertson4, D. G. Sarantites3, L. G. Sobotka3,4, and J. A. Winger5,†
1National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824-1321
2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321
3Department of Chemistry, Washington University, St. Louis, Missouri 63130
4Department of Physics, Washington University, St. Louis, Missouri 63130
5Cyclotron Institute, Texas A & M University, College Station, Texas 77843

Received 17 August 1994; published in the issue dated 6 February 1995

The three-body decay 12O→2p+10C was studied following production via single-neutron stripping from a radioactive 13O projectile. This is the first observation of two-proton emission from an unbound ground state where the one-proton emission channel is energetically closed beyond the lightest case of 6Be. No evidence for 2He emission is seen, despite predictions for a large diproton branching ratio. An upper limit of 7% (95% C.L.) is established for this decay branch. The implications of the small diproton branching ratio observed here and seen previously in 6Be are discussed.

© 1995 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.860
DOI:
10.1103/PhysRevLett.74.860
PACS:
23.50.+z, 25.60.+v, 27.20.+n

*Present address: RIKEN, Hirosawa, Wako, Saitama 351-01 Japan.

†Present address: Department of Physics and Astronomy, Mississippi State University, Mississippi State, MS 39762.

 
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