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Title:
First Observation of Ground State Dineutron Decay: Be16
Authors:
Spyrou, A.; Kohley, Z.; Baumann, T.; Bazin, D.; Brown, B. A.; Christian, G.; Deyoung, P. A.; Finck, J. E.; Frank, N.; Lunderberg, E.; Mosby, S.; Peters, W. A.; Schiller, A.; Smith, J. K.; Snyder, J.; Strongman, M. J.; Thoennessen, M.; Volya, A.
Affiliation:
AA(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AB(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA), AC(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA), AD(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA), AE(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AF(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AG(Department of Physics, Hope College, Holland, Michigan 49423, USA), AH(Department of Physics, Central Michigan University, Mt. Pleasant, Michigan, 48859, USA), AI(Department of Physics & Astronomy, Augustana College, Rock Island, Illinois, 61201, USA), AJ(Department of Physics, Hope College, Holland, Michigan 49423, USA), AK(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AL(Department of Physics & Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA), AM(Department of Physics & Astronomy, Ohio University, Athens, Ohio 45701, USA), AN(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AO(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AP(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AQ(National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, Michigan 48824, USA), AR(Department of Physics, Florida State University, Tallahassee, Florida 32306, USA)
Publication:
Physical Review Letters, vol. 108, Issue 10, id. 102501 (PhRvL Homepage)
Publication Date:
03/2012
Origin:
APS
PACS Keywords:
Properties of nuclei, nuclear energy levels, Binding energies and masses, 6<, =A<, =19
DOI:
10.1103/PhysRevLett.108.102501
Bibliographic Code:
2012PhRvL.108j2501S

Abstract

We report on the first observation of dineutron emission in the decay of Be16. A single-proton knockout reaction from a 53MeV/u B17 beam was used to populate the ground state of Be16. Be16 is bound with respect to the emission of one neutron and unbound to two-neutron emission. The dineutron character of the decay is evidenced by a small emission angle between the two neutrons. The two-neutron separation energy of Be16 was measured to be 1.35(10) MeV, in good agreement with shell model calculations, using standard interactions for this mass region.
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