Eur. Phys. J. A (2010) 46: 5-16
https://doi.org/10.1140/epja/i2010-11021-2

Regular Article - Experimental Physics

Highly excited alpha-cluster states in ³²S studied with the thick-target inverse kinematics method

¹ Department of Physics, Åbo Akademi, FIN-20500, Turku, Finland
² Russian Research Center “Kurchatov”, Moscow, Russia
³ Cyclotron Institute, Texas A & M University, College Station, TX, USA
⁴ Department of Physics, Florida State University, Tallahassee, FL, USA
⁵ Joint Institute for Nuclear Research, Dubna, Russia
⁶ Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania, Italy
⁷ Dipartimento di Fisica ed Astronomia, Università di Catania, Catania, Italy
⁸ Department of Physics, University of Jyväskylä, Jyväskylä, Finland

^* e-mail: mnorrby@abo.fi

Received: 26 April 2010
Accepted: 26 July 2010
Published online: 6 August 2010

Abstract

Excitation functions of elastic ²⁸Si + scattering were measured employing the relatively new thick-target inverse kinematics technique, confirming the usefulness of the method. Data were taken at a ²⁸Si beam energy of 150MeV in a reaction chamber filled with ⁴He gas, corresponding to the excitation region of 10-24MeV in ³²S . Results are compared to earlier studies, in order to validate the method and explore its limitations. The data were treated in the framework of a simplified R -matrix approach. Energies, widths and spin assignments were obtained for 129 resonances in this mid-shell nucleus. The structure is discussed within the concept of -cluster structure in the quasi-continuum of ³²S .