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Subthreshold pion dynamics as a source for hard photons beyond proton-neutron bremsstrahlung in heavy in heavy-ion collisions

Abstract : We report on the first measurement in heavy-ion collisions of hard photons of extremely high energies that extend the photon spectrum to 5 times the beam energy per nucleon. The photon spectrum was measured for the systems 86Kr+natNi at 60AMeV and 181Ta+197Au at 40A MeV. The data are interpreted using the Dubna cascade model. The radiative channel of pion-nucleon interaction π+N→N+γ, involving subthreshold pions produced in the nuclear medium, dominates all other processes considered for the production of the very energetic photons. This channel was never considered so far at beam energies below the pion threshold.
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http://hal.in2p3.fr/in2p3-00016126
Contributeur : Sandrine Guesnon <>
Soumis le : jeudi 22 juin 2000 - 16:03:27
Dernière modification le : lundi 6 janvier 2020 - 16:16:02

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K.K. Gudima, T. Matulewicz, H. Delagrange, F.M. Marqués, Gines Martinez Garcia, et al.. Subthreshold pion dynamics as a source for hard photons beyond proton-neutron bremsstrahlung in heavy in heavy-ion collisions. Physical Review Letters, American Physical Society, 1996, 76, pp.2412-2415. ⟨10.1103/PhysRevLett.76.2412⟩. ⟨in2p3-00016126⟩

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