Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV

Details Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV

1997-06-04

arxiv.org/abs/nucl-ex/9706001v1

Phys.Lett.B407:115-120,1997

Physics

Nuclear Physics

Nuclear Experiment

14 pages, LaTeX with 3 included figures; submitted to Physics Letters B

Scientific paper

10.1016/S0370-2693(97)00707-7

Charged pion spectra measured in 58Ni-58Ni collisions at 1.06, 1.45 and 1.93 AGeV are interpreted in terms of a thermal model including the decay of Delta resonances. The transverse momentum spectra of pions are well reproduced by adding the pions originating from the Delta-resonance decay to the component of thermal pions, deduced from the high transverse momentum part of the pion spectra. About 10 and 18% of the nucleons are excited to Delta states at freeze-out for beam energies of 1 and 2 AGeV, respectively.

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