München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Postersitzung

HK 21.9: Poster

Dienstag, 21. März 2006, 15:30–17:00, P

Search for light η-mesic nuclei in the (d,³He) transfer reaction — •A. Gillitzer¹, H. Geissel², R.S. Hayano³, K. Itahashi⁴, M. Iwasaki⁴, K. Lindberg⁵, Yu. Litvinov², Ch. Nociforo², N. Ono³, H. Outa⁴, M. Shindo³, K. Suzuki⁶, P.-E. Tegnér⁵, D. Tomono⁴, A. Trzcinska⁷, H. Weick², and I. Zartova⁵ — ¹IKP, Forschungszentrum Jülich — ²GSI Darmstadt — ³University of Tokyo — ⁴RIKEN — ⁵Stockholm University — ⁶TU München — ⁷Warsaw University

The η-nucleon interaction may create a strong enough attractive potential to allow for nuclear bound states of η mesons. Experimental searches for such η-mesic nuclear states have not been conclusive so far albeit some positive evidence was seen. Recently, the d+¹²C→³He+X reaction was studied at the GSI Fragment Separator at T_d=3.5 GeV/c, which allows to produce an η meson at rest in the nuclear environment, and to deduce its optical potential from the measured ³He momentum. ³He particles were identified against a 10⁸/s background rate of protons from d break-up. The experimental method and the status of the data analysis will be presented.