منابع مشابه
- ex / 9 60 80 04 v 1 1 3 A ug 1 99 6 Pionic Fusion of Heavy Ions
We report the first experimental observation of the pionic fusion of two heavy ions. The 12 C(12 C, 24 Mg)π 0 and 12 C(12 C, 24 Na)π + cross sections have been measured to be 208 ± 38 and 182 ± 84 picobarns, respectively, at E cm = 137 MeV. This cross section for heavy-ion pion production, at an energy just 6 MeV above the absolute energy-conservation limit, constrains possible production mecha...
متن کاملQuantum Statistical Effects on Fusion Dynamics of Heavy-ions
In order to describe the fusion of two very heavy nuclei at near barrier energies, a generalized Langevin approach is proposed, which incorporates the quantum statistical fluctuations in accordance with the fluctuation and dissipation theorem. It is illustrated that the quantum statistical effects introduce an enhancement of the formation of compound nucleus, though the quantum enhancement is s...
متن کاملHeavy Ions Theory Review *
The advent of collider energies to heavy–ion physics is leading to a profound change in the field. The new tools available, specially the access to the large transverse momentum part of the spectrum, allow for an unprecedented characterization of the high–density state created in such collisions. Accordingly, the traditional goal of producing a Quark-Gluon Plasma, the deconfined state of quarks...
متن کاملABC Effect in Double-Pionic Fusion – a New Resonance?
The ABC effect, an intriguing low-mass enhancement in the ππ invariant mass spectrum — known since more than 50 years from inclusive measurements of double-pionic fusion reactions — is reexamined. To this end exclusive and kinematically complete high-statistics experiments of the fusion reactions to d, 3He and 4He have been carried out with WASA at COSY. These measurements cover the full energy...
متن کاملQCD and Heavy Ions
This short paper is an attempt to describe a theorist’s view of the goals of relativistic heavy ion program which has just entered the collider era. These goals are centered around understanding the properties and the critical behavior of Quantum Chromo–Dynamics (QCD) in the non–linear regime of high color field strength and high parton density. Some of the current theoretical challenges are hi...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1996
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.77.2408