Abundance of Delta Resonances in 58Ni+58Ni Collisions between 1 and 2 AGeV
FOPI Collaboration, B. Hong, N. Herrmann, J. L. Ritman, D. Best, A. Gobbi, K. D. Hildenbrand, M. Kirejczyk, Y. Leifels, C. Pinkenburg, W. Reisdorf, D. Schuell, U. Sodan, G. S. Wang, T. Wienold, J. P. Alard, V. Amouroux, N. Bastid, I. Belyaev, G. Berek, J. Biegansky, A. Buta, J. P. Coffin, P. Crochet, R. Dona, P. Dupieux, M. Eskef, P. Fintz, Z. Fodor, L. Fraysse, A. Genoux-Lubain, G. Goebels, G. Guillaume, E. Haefele, F. Jundt, J. Kecskemeti, M. Korolija, R. Kotte, C. Kuhn, A. Lebedev, I. Legrand, C. Maazouzi, V. Manko, J. Moesner, S. Mohren, W. Neubert, D. Pelte, M. Petrovici, P. Pras, F. Rami, C. Roy, Z. Seres, B. Sikora, V. Simion, K. Siwek-Wilczynska, A. Somov, L. Tizniti, M. Trzaska, M. A. Vasiliev, P. Wagner, D. Wohlfarth, A. Zhilin
Abstract
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.
Create a lesson
Related papers
Physics with Radioactive Ion Beams at the Nuclear Science Laboratory
W. S. Porter, D. W. Bardayan, M. Brodeur et al.
16O(p,γ)17F Reaction and the C and O Isotopic Ratios in Red Giant Branch Stars
D. Robb, P. McGlynn, M. Aliotta et al.
Probing the production mechanisms of virtual photons at RHIC
STAR Collaboration
The 3He(α,γ)7Be γ-ray angular distribution: measured, and calculated by effective field theory
S. Turkat, P. Hempel, X. Zhang et al.
Letter of Intent for Alpha Knockout from Nuclei in Hard Exclusive Processes with ALERT
Whitney R. Armstrong†, Ian Cloët, Fernando A. Flor et al.
Probing high-momentum components in 16O via zero-degree (p,d) cross-section ratios
FRS Experiment Collaboration, X. Wang, H. J. Ong et al.