Identical Pion Intensity Interferometry in Central Au+Au Collisions at 1.23A GeV

J. Adamczewski-Musch,O. Arnold,C. Behnke,A. Belounnas,A. Belyaev,J. C. Berger-Chen,J. Biernat,A. Blanco,C. Blume,M. Böhmer,P. Bordalo,S. Chernenko,L. Chlad,C. Deveaux,J. Dreyer,A. Dybczak,E. Epple,L. Fabbietti,O. Fateev,P. Filip,P. Fonte,C. Franco,J. Friese,I. Fröhlich,T. Galatyuk,J. A. Garzon,R. Gernhäuser,M. Golubeva,R. Greifenhagen,F. Guber, M. Gumberidze,S. Harabasz,T. Heinz,T. Hennino,S. Hlavac, C. Höhne,R. Holzmann,A. Ierusalimov,A. Ivashkin,B. Kämpfer,T. Karavicheva,B. Kardan,I. Koenig,W. Koenig,B. W. Kolb,G. Korcyl,G. Kornakov,R. Kotte, W. Kühn,A. Kugler,T. Kunz,A. Kurepin,A. Kurilkin,P. Kurilkin,V. Ladygin,R. Lalik,K. Lapidus,A. Lebedev,L. Lopes,M. Lorenz,T. Mahmoud,L. Maier,A. Mangiarotti,J. Markert,T. Matulewicz,S. Maurus,V. Metag,J. Michel,D. M. Mihaylov,S. Morozov,C. Müntz,R. Münzer,L. Naumann,K. N. Nowakowski,M. Palka,Y. Parpottas,V. Pechenov,O. Pechenova,O. Petukhov,K. Piasecki,J. Pietraszko,W. Przygoda,S. Ramos, B. Ramstein,A. Reshetin,P. Rodriguez-Ramos,P. Rosier,A. Rost,A. Sadovsky,P. Salabura,T. Scheib, H. Schuldes,E. Schwab,F. Scozzi,F. Seck,P. Sellheim, J. Siebenson,L. Silva,Yu. G. Sobolev,S. Spataro, H. Ströbele, J. Stroth, P. Strzempek, C. Sturm, O. Svoboda, M. Szala, P. Tlusty, M. Traxler, H. Tsertos, E. Usenko, V. Wagner, C. Wendisch, M. G. Wiebusch, J. Wirth, D. Wojcik, Y. Zanevsky, P. Zumbruch

Physics letters B（2019）

Cited 34|Views115

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Abstract

We investigate identical pion HBT intensity interferometry for central Au+Au collisions at 1.23A GeV. High-statistics π^-π^- and π^+π^+ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinal-comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted Coulomb-corrected source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy. Our data would thus rather disfavour any strong energy dependence of the radius parameters in the low energy region.

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