Rapidity dependence of entropy production in proton- and nucleus-induced reactions on heavy nuclei
نویسندگان
چکیده
The entropy of hot nuclear Systems is deduced from the mass distribution of fragments emitted from high energy protonand nucleus-induced reactions via a quantum statistical model. It is found that the entropy per baryon, S / A , of intermediate rapidity ("participant") fragments is higher than the entropy of target rapidity ("spectator") fragments. The spectator fragments exhibit S / A values of s 1.8 independent of the projectile energy from 30 MeV/nucleon up to 350 GeV. This value of the entropy coincides with the entropy at which nuclear matter becomes unbound.
منابع مشابه
J/Ψ production in heavy ion collisions and gluon saturation
We calculate the inclusive J/Ψ production in heavy ion collisions including the effects of gluon saturation in the wave functions of the colliding nuclei. We argue that the dominant production mechanism in proton–nucleus and nucleus–nucleus collisions for heavy nuclei is different from the one in hadron-hadron interactions. We find that the rapidity distribution of primary J/Ψ production is mor...
متن کاملProduction of hypernuclei in heavy-ion collisions
Hypernuclear physics is a useful tool to investigate the properties of the hyperon-nucleon (Y N ) and the hyperonhyperon (Y Y ) interaction [1]. The knowledge of the strangeness sector of the hadronic equation of state might be important for nuclear astrophysics, e.g., for the properties of neutron stars [2], and in exploring exotic states of finite nuclei, e.g., neutron-rich strange nuclei and...
متن کاملThe φ meson width in the medium from proton induced φ production in nuclei February 8 , 2008
We perform calculations for the production of φ mesons in nuclei at energies just above threshold and study the A dependence of the cross section. We use results for the φ selfenergy in the medium obtained within a chiral unitary approach. We find a strong A dependence which is tied to the distortion of the incident proton and to the absorption of the φ in its way out of the nucleus. The effect...
متن کاملThe φ meson width in the medium from proton induced φ production in nuclei March 3 , 2008
We perform calculations for the production of φ mesons in nuclei at energies just above threshold and study the A dependence of the cross section. We use results for the φ selfenergy in the medium obtained within a chiral unitary approach. We find a strong A dependence which is tied to the distortion of the incident proton and to the absorption of the φ in its way out of the nucleus. The effect...
متن کاملMeasuring the φ meson width in the medium from p induced φ production in nuclei
1 Measuring the φ meson width in the medium from p induced φ production in nuclei We study the A dependence of the φ meson production cross section in proton nucleus reactios at energies just above threshold, which are accessible in an experimental facility like COSY. This A dependence has two sources: the distortion of the incident proton and the absorption of the φ in its way out of the nucle...
متن کامل