pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV - The European Physical Journal A

pp and ππ intensity interferometry in collisions of Ar+KCl at 1.76A GeV - The European Physical Journal A

Agakishiev, G.;Balanda, A.;Bannier, B.;Bassini, R.;Belver, D.;Belyaev, A. V.;Blanco, A.;Böhmer, M.;Boyard, J. L.;Cabanelas, P.;Castro, E.;Chernenko, S.;Christ, T.;Destefanis, M.;Dıaz, J.;Dohrmann, F.;Dybczak, A.;Eberl, T.;Epple, E.;Fabbietti, L.;Fateev, O. V.;Finocchiaro, P.;Fonte, P.;Friese, J.;Fröhlich, I.;Galatyuk, T.;Garzón, J. A.;Gernhäuser, R.;Gil, A.;Gilardi, C.;Golubeva, M.;González-Dıaz, D.;Guber, F.;Gumberidze, M.;Heilmann, M.;Heinz, T.;Hennino, T.;Holzmann, R.;Huck, P.;Iori, I.;Ivashkin, A.;Jurkovic, M.;Kämpfer, B.;Kanaki, K.;Karavicheva, T.;Kirschner, D.;Koenig, I.;Koenig, W.;Kolb, B. W.;Kotte, R.;Krizek, F.;Krücken, R.;Kühn, W.;Kugler, A.;Kurepin, A.;Lang, S.;Lange, J. S.;Lapidus, K.;Liu, T.;Lopes, L.;Lorenz, M.;Maier, L.;Mangiarotti, A.;Markert, J.;Metag, V.;Michalska, B.;Michel, J.;Mishra, D.;Morinière, E.;Mousa, J.;Müntz, C.;Naumann, L.;Otwinowski, J.;Pachmayer, Y. C.;Palka, M.;Parpottas, Y.;Pechenov, V.;Pechenova, O.;Pérez Cavalcanti, T.;Pietraszko, J.;Przygoda, W.;Ramstein, B.;Reshetin, A.;Roy-Stephan, M.;Rustamov, A.;Sadovsky, A.;Sailer, B.;Salabura, P.;Schmah, A.;Schwab, E.;Siebenson, J.;Sobolev, Yu. G.;Spataro, S.;Spruck, B.;Ströbele, H.;Stroth, J.;Sturm, C.;Tarantola, A.;Teilab, K.;Tlusty, P.;Traxler, M.;Trebacz, R.;Tsertos, H.;Wagner, V.;Weber, M.;Wendisch, C.;Wisniowski, M.;Wojcik, T.;Wüstenfeld, J.;Yurevich, S.;Zanevsky, Y. V.;Zhou, P.;Zumbruch, P.;Agakishiev, G.;Balanda, A.;Bannier, B.;Bassini, R.;Belver, D.;Belyaev, A. V.;Blanco, A.;Böhmer, M.;Boyard, J. L.;Cabanelas, P.;Castro, E.;Chernenko, S.;Christ, T.;Destefanis, M.;Dıaz, J.;Dohrmann, F.;Dybczak, A.;Eberl, T.;Epple, E.;Fabbietti, L.;Fateev, O. V.;Finocchiaro, P.;Fonte, P.;Friese, J.;Fröhlich, I.;Galatyuk, T.;Garzón, J. A.;Gernhäuser, R.;Gil, A.;Gilardi, C.;Golubeva, M.;González-Dıaz, D.;Guber, F.;Gumberidze, M.;Heilmann, M.;Heinz, T.;Hennino, T.;Holzmann, R.;Huck, P.;Iori, I.;Ivashkin, A.;Jurkovic, M.;Kämpfer, B.;Kanaki, K.;Karavicheva, T.;Kirschner, D.;Koenig, I.;Koenig, W.;Kolb, B. W.;Kotte, R.;Krizek, F.;Krücken, R.;Kühn, W.;Kugler, A.;Kurepin, A.;Lang, S.;Lange, J. S.;Lapidus, K.;Liu, T.;Lopes, L.;Lorenz, M.;Maier, L.;Mangiarotti, A.;Markert, J.;Metag, V.;Michalska, B.;Michel, J.;Mishra, D.;Morinière, E.;Mousa, J.;Müntz, C.;Naumann, L.;Otwinowski, J.;Pachmayer, Y. C.;Palka, M.;Parpottas, Y.;Pechenov, V.;Pechenova, O.;Pérez Cavalcanti, T.;Pietraszko, J.;Przygoda, W.;Ramstein, B.;Reshetin, A.;Roy-Stephan, M.;Rustamov, A.;Sadovsky, A.;Sailer, B.;Salabura, P.;Schmah, A.;Schwab, E.;Siebenson, J.;Sobolev, Yu. G.;Spataro, S.;Spruck, B.;Ströbele, H.;Stroth, J.;Sturm, C.;Tarantola, A.;Teilab, K.;Tlusty, P.;Traxler, M.;Trebacz, R.;Tsertos, H.;Wagner, V.;Weber, M.;Wendisch, C.;Wisniowski, M.;Wojcik, T.;Wüstenfeld, J.;Yurevich, S.;Zanevsky, Y. V.;Zhou, P.;Zumbruch, P.;
the european physical journal a 2011 Vol. 47 pp. 63-
15
g.2011thepp

Abstract

Results on pp, π+π+, and π−π− intensity interferometry are reported for collisions of Ar+KCl at 1.76A GeV beam energy, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. The experimental correlation functions as a function of the relative momentum are compared to model calculations allowing the determination of the space-time extent of the corresponding emission sources. The ππ source radii are found significantly larger than the pp emission radius. The present radii do well complement the beam-energy dependences of Gaussian source radii of the collision system of size A + A ≃ 40 + 40 . The pp source radius at fixed beam energy is found to increase linearly with the cube root of the number of participants. From this trend, a lower limit of the pp correlation radius is deduced.

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doi:10.1140/epja/i2011-11063-x
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