Alpha structure of super(12)B studied by elastic scattering of super(8)Li EXCYT beam on super(4)He thick target

• Published in: Journal of physics. Conference series Vol. 267; pp. 1 - 6
• Main Authors: Pellegriti, M G, Torresi, D, Cosentino, L, Di Pietro, A, Ducoin, C, Lattuada, M, Lonnroth, T, Figuera, P, Fisichella, M, Maiolino, C
• Format: Journal Article
• Language: English
• Published: 01.01.2011
• Subjects: Alpha particles; Alpha rays; Chambers; Detectors; Elastic scattering; Intervals; Inverse kinematics; Recoil
• DOI: 10.1088/1742-6596/267/1/012011
• ISSN: 1742-6588

The super(8)Li elastic scattering on super(4)He in inverse kinematics has been studied in order to search for super(8)Li- alpha cluster configurations in excited states of super(12)B. The experimental technique, the inverse kinematic thick target method (TTIK), involved a super(8)Li beam provided by the EXCYT facility at an initial energy of E sub(b)=30.6 MeV which is continuously degraded down to zero in the passage through a helium extended thick target. After the interaction, the recoil alpha particles were detected by using four Delta E-E silicon detector telescopes. The explored super(8)Li- alpha centre-of-mass energy ranges from E sub(CM)=2.7 MeV up to E sub(CM)=9.6 MeV. A micro-channel plate, placed before the gas chamber, is used to measure the time interval between the entrance of the super(8)Li into the chamber and the arrival of the recoil alpha particle on the detectors. This "time interval" measurement improves the TTIK technique allowing the discrimination of elastic from inelastic events. In this paper, the experimental technique will be described and the preliminary results for the elastic cross section will be shown.