Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Electromagentic and Hadronic Probes

HK 12.20: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Deeply bound pionic states in Sn isotopes — •A. Gillitzer¹, M. Fujita², H. Geissel³, H. Gilg⁴, R.S. Hayano⁵, S. Hirenzaki², K. Itahashi⁶, M. Iwasaki⁶, P. Kienle⁴, L. Maier⁴, M. Matos³, G. Münzenberg³, T. Ohtsubo⁷, M. Sato⁶, M. Shindo⁵, K. Suzuki⁵, T. Suzuki⁵, H. Weick³, M. Winkler³, T. Yamazaki⁸, and T. Yoneyama⁶ — ¹IKP, Forschungszentrum Jülich — ²Nara Women’s University — ³GSI Darmstadt — ⁴Technische Universität München — ⁵University of Tokyo — ⁶Tokyo Institute of Technology — ⁷Niigata University — ⁸RI Beam Science Lab., RIKEN

The comparative measurement of binding energy and width of deeply bound pionic states in nuclei with different N/Z ratio allows to separately determine the isoscalar and the isovector part of the pion-nucleus potential. For this purpose the population of deeply bound pionic states in Sn isotopes was studied in a recent experiment at the GSI Fragmentseparator (FRS), using the (d,³He) reaction from ^{112,116,120,124}Sn targets. The incident d beam kinetic energy was chosen to be 500 MeV in order to allow the formation of substitutional pionic 1s states coupled to 3s_1/2 neutron hole states in recoilfree kinematics. Prominent peaks in the excitation energy spectrum corresponding to the pionic 1s state were observed in the irradiation of ^116,120,124Sn. First results of the data analysis will be presented.