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23 April 2024

» arxiv » 1811.6213

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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 ; 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 ; 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 ; Y. Zanevsky ; P. Zumbruch ;
Date:	15 Nov 2018
Abstract:	For the first time, identical pion HBT intensity interferometry is investigated for a large heavy ion collision system in the energy region of 1 GeV per nucleon. High-statistics $pi^-pi^-$ and $pi^+pi^+$ data are presented for central Au+Au collisions at 1.23A GeV, 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.
Source:	arXiv, 1811.6213
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