Exploring the neutron dripline two neutrons at a time: The first observations of the 26O and 16Be ground state resonances

Z. Kohley*, A. Spyrou, E. Lunderberg, P. A. Deyoung, H. Attanayake, T. Baumann, D. Bazin, B. A. Brown, G. Christian, D. Divaratne, S. M. Grimes, A. Haagsma, J. E. Finck, N. Frank, B. Luther, S. Mosby, T. Nagi, G. F. Peaslee, W. A. Peters, A. SchillerJ. K. Smith, J. Snyder, M. J. Strongman, M. Thoennessen, A. Volya

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

The two-neutron unbound ground state resonances of 26O and 16Be were populated using one-proton knockout reactions from 27F and 17B beams. A coincidence measurement of 3-body system (fragment + n + n) allowed for the decay energy of the unbound nuclei to be reconstructed. A low energy resonance, < 200 keV, was observed for the first time in the 240 + n + n system and assigned to the ground state of 26O. The 16Be ground state resonance was observed at 1.35 MeV. The 3-body correlations of the 14Be + n + n system were compared to simulations of a phase-space, sequential, and dineutron decay. The strong correlations in the n-n system from the experimental data could only be reproduced by the dineutron decay simulation providing the first evidence for a dineutron-like decay.

Original languageEnglish (US)
Article number012052
JournalJournal of Physics: Conference Series
Volume420
Issue number1
DOIs
StatePublished - 2013
Externally publishedYes
Event11th International Conference on Nucleus-Nucleus Collisions, NN 2012 - San Antonio, TX, United States
Duration: May 27 2012Jun 1 2012

ASJC Scopus subject areas

  • General Physics and Astronomy

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