Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 11: Few-body physics

HK 11.7: Vortrag

Montag, 16. März 2009, 15:45–16:00, H-ZO 100

pions in nuclei — •leila joulaeizadeh¹, jose bacelar¹, igor gašparić², and herbert löhner¹ — ¹KVI, University of Groningen, Groningen, The Netherlands — ²Ruder Bošković Institute, Zagreb, Croatia

The role of pions in nuclei has been studied in pionic fusion, a highly coherent process in which two nuclei fuse to a united nucleus. The available center-of-mass energy is emitted in the pion channel. This production mechanism is sensitive to the pion-nucleon interaction and the structure of the fused nuclei, in particular to their cluster components. The experiment exploits the two-photon decay of neutral pions and provides the exclusive cross sections for the ⁴He(³He,π⁰)⁷Be and ⁶Li(⁴He,π⁰)¹⁰B reactions at energies just above the coherent production threshold. The pion angular distributions and their dependence on the fused system mass reflect the importance of the cluster sub-structure of nuclei and the pion interaction in nuclei.

[1] L. Joulaeizadeh et al., Pionic Fusion Experiments at Subthreshold Energies, AIP proceedings, Carpathian Summer School of Physics 2007, 475 (2008), ISBN 978-0-7354-0490-8.