The Li-8 elastic scattering on a He-4 gas target was studied by means of the Inverse Kinematic Thick Target scattering method (TTIK) in order to investigate cluster configurations in excited states of B-12. A Li-8 beam, at E-c.m. = 10.2 MeV, was provided by the EXCYT radioactive beam facility at Catania. The beam, while passing through the helium thick target decreases its energy, thus exploring the Li-8-alpha center-of-mass energy range 2.7 MeV <= E-CM <= 9.6 MeV. Four Delta E-E silicon detector telescopes were used to detect the recoiling alpha particles. The time interval between the Li-8 passing through a on plate foil, placed at the entrance of the chamber, and the detection of the alpha particles by the Delta E detectors was also measured. The time measurement allows to disentangle elastic from reactions events, otherwise impossible from energy measurements. This can be considered as an improvement of the TTIK method. In this paper the used experimental technique and the obtained preliminary results will be presented.
Li-alpha CLUSTER STATES IN B-12 USING Li-8 + He-4 INVERSE KINEMATICS ELASTIC SCATTERING
TORRESI, DOMENICO MARIO;STRANO, EMANUELE;
2011
Abstract
The Li-8 elastic scattering on a He-4 gas target was studied by means of the Inverse Kinematic Thick Target scattering method (TTIK) in order to investigate cluster configurations in excited states of B-12. A Li-8 beam, at E-c.m. = 10.2 MeV, was provided by the EXCYT radioactive beam facility at Catania. The beam, while passing through the helium thick target decreases its energy, thus exploring the Li-8-alpha center-of-mass energy range 2.7 MeV <= E-CM <= 9.6 MeV. Four Delta E-E silicon detector telescopes were used to detect the recoiling alpha particles. The time interval between the Li-8 passing through a on plate foil, placed at the entrance of the chamber, and the detection of the alpha particles by the Delta E detectors was also measured. The time measurement allows to disentangle elastic from reactions events, otherwise impossible from energy measurements. This can be considered as an improvement of the TTIK method. In this paper the used experimental technique and the obtained preliminary results will be presented.
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