Recent results related to excited states of 6Be and 10He
1 Flerov Laboratory of Nuclear Reactions, JINR, Dubna, 141980, Russia
2 Institute of Physics, Silesian University in Opava, Bezrucovo nam. 13, 74601, Czech Republic
3 Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, 141980, Russia
4 GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
5 Russian Research Center “The Kurchatov Institute”, Kurchatov sq. 1, 123182 Moscow, Russia
6 Institute of Nuclear Physics PAN, Radzikowskiego 152, PL-31342 Krakow, Poland
7 RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
8 Fundamental Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden
9 All-Russian Research Institute of Experimental Physics, RU-607190 Sarov, Russia
The 1H(6Li, 6Be)n charge-exchange reaction and the 3H(8He,p)10He two-neutron transfer reaction were recently carried out at the ACCULINNA fragment separator (FLNR, Dubna) to populate the ground and excited states of 6Be and 10He nuclei, respectively. The 6Be ET spectrum (ET is the 6Be energy above its 4He+p+p decay threshold) was obtained with high statistics and described by the well-known 0+ ground state of 6Be at ET = 1.37 MeV, the 2+ state at ET = 3.05 MeV and a broad structure extending from 4 to 16 MeV which could be interpreted as the isovector soft dipole mode associated with the 6Li ground state. In the 10He case the 0+ ground state was found at about 2.1(2) MeV (Γ ~ 2 MeV) above the 8He+n+n breakup threshold. Angular correlations observed for 10He decay products show prominent interference patterns allowing to draw conclusions about the structure of low-energy excited states: 1-(ET ~ 5 MeV) and 2+ (ET ~ 6 MeV).
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