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

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C. Blume M. B\"ohmer 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. Fr\"ohlich T. Galatyuk J.A. Garzon R. Gernh\"auser M. Golubeva R. Greifenhagen F. Guber M. Gumberidze S. Harabasz T. Heinz T. Hennino S. Hlavac C. H\"ohne R. Holzmann A. Ierusalimov A. Ivashkin B. K\"ampfer T. Karavicheva B. Kardan I. Koenig W. Koenig B.W. Kolb G. Korcyl G. Kornakov R. Kotte W. K\"uhn 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. M\"untz R. M\"unzer 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. Str\"obele 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

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keywords energyparameterscentralcollisionsdatadependencefunctionidentical

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We investigate identical pion HBT intensity interferometry for central Au+Au collisions at 1.23A GeV. High-statistics $\pi^-\pi^-$ and $\pi^+\pi^+$ 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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Identical pion intensity interferometry in central Au+Au collisions at 1.23A GeV

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