Study of the 14Be continuum: identification and structure of its second 2+ state.
The coupling between bound quantum states and those in the continuum is of high theoretical interest. Experimental studies of bound drip-line nuclei provide ideal testing grounds for such investigations since they, due to the feeble binding energy of their valence particles, are easy to excite into the continuum. In this Letter, continuum states in the heaviest particle-stable Be isotope, 14Be, are studied by employing the method of inelastic proton scattering in inverse kinematics. New continuum states are found at excitation energies E*=3.54(16)  MeV and E*=5.25(19)  MeV. The structure of the earlier known 2(1)+ state at 1.54(13) MeV was confirmed with a predominantly (0d5/2)2 configuration while there is very clear evidence that the 2(2)+ state has a predominant (1s1/2, 0d5/2) structure with a preferential three-body decay mechanism. The region at about 7 MeV excitation shows distinct features of sequential neutron decay via intermediate states in 13Be. This demonstrates that the increasing availability of energetic beams of exotic nuclei opens up new vistas for experiments leading towards a new understanding of the interplay between bound and continuum states.
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
Yu
Y
Aksyutina
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany and Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany.
T
T
Aumann
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
K
K
Boretzky
Instituto de Estructura de la Materia, CSIC, ES-28006 Madrid, Spain.
M J G
MJ
Borge
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany and Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany.
C
C
Caesar
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
A
A
Chatillon
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany and Kurchatov Institute, RU-123182 Moscow, Russia.
L V
LV
Chulkov
Universidade de Santiago de Compostela, ES-15782 Santiago de Compostela, Spain.
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D
Cortina-Gil
Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata IN-700064, India.
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U
Datta Pramanik
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
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H
Emling
Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark.
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HO
Fynbo
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
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H
Geissel
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
A
A
Heinz
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
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Ickert
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
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HT
Johansson
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
B
B
Jonson
Instytut Fisiki, Uniwersytet Jagelloński, PL-30-059 Krakóv, Poland.
R
R
Kulessa
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
C
C
Langer
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
T
T
LeBleis
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
K
K
Mahata
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
G
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Münzenberg
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
T
T
Nilsson
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
G
G
Nyman
Institut für Kernphysik, Johann-Wolfgang-Goethe-Universität, D-60486 Frankfurt, Germany.
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R
Palit
Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany.
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S
Paschalis
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
W
W
Prokopowicz
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany and Institut für Kernphysik, Johann-Wolfgang-Goethe-Universität, D-60486 Frankfurt, Germany.
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R
Reifarth
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
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D
Rossi
Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany.
A
A
Richter
Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark.
K
K
Riisager
Institut für Kernphysik, Technische Universität, D-64289 Darmstadt, Germany.
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G
Schrieder
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
H
H
Simon
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
K
K
Sümmerer
Instituto de Estructura de la Materia, CSIC, ES-28006 Madrid, Spain.
O
O
Tengblad
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
R
R
Thies
GSI Helmholtzzentrum für Schwerionenforschung GmbH, ExtreMe Matter Institute, EMMI, D-64291 Darmstadt, Germany.
H
H
Weick
Fundamental Fysik, Chalmers Tekniska Högskola, SE-41296 Göteborg, Sweden.
M V
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Zhukov