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Emission patterns of neutral pions in 40A MeV Ta plus Au reactions

AuthorsYahlali, Nadia ; Díaz Medina, José ; Matulewicz, T.; Delagrange, H.; Piasecki, K.; D'Enterria, D. G.; Fernández Moreno, Francisco; Kugler, A.; Lohner, H.; Martínez García, Ginés; Ostendorf, R. W.; Schutz, Y.; Tlusty, P.; Turrisi, R.; Wagner, V.; Wilschut, H. W.
Issue Date28-May-2010
PublisherAmerican Physical Society
CitationPhysical Review - Section C - Nuclear Physics 81 (5): 054912 (2010)
AbstractDifferential cross sections of neutral pions emitted in Ta-181+Au-197 collisions at a beam energy of 39.5A Me V have been measured with the two-arm photon spectrometer (TAPS). The kinetic energy and transverse momentum spectra of neutral pions cannot be properly described in the framework of the thermal model, nor when the reabsorption of pions is accounted for in a phenomenological model. However, high energy and high momentum tails of the pion spectra can be well fitted through thermal distributions with unexpectedly soft temperature parameters below 10 MeV.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.81.054912
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