Deuterons from High-Energy Proton Bombardment of Matter

Abstract

The results of a process of formation of high-energy deuterons from targets exposed to 25-30 BeV proton beams are evaluated. The formation mechanism involves the pairing of a neutron and proton from the cascade of nucleons which develops within the struck nucleus. The interactions responsible for the deuteron formation are firstly the average nuclear interaction seen by the cascade nucleons within the nucleus, and secondly the normal neutron-proton interaction. A magnitude of 25 MeV for the modulus of the real and imaginary nuclear potentials is sufficient to ensure good agreement with experiment for all energies of the outgoing deuterons and for all emerging angles.

Elliptic Flow at Large Transverse Momenta from Quark Coalescence

“…We allow for p T dependent coalescence factors because more careful treatment of the coalescence problem [23] shows that such a dependence may arise, e.g., due to kinematic (energy) factors or strong radial flow. This, however, does not influence elliptic flow because it is a ratio from which the coalescence factors drop out (see Eq.…”

Recent results on light nuclei production from the NA49 experiment

“…In a coalescence approach [16,17] the invariant yield N A of clusters with charge Z and atomic mass number A is related to the product of the yields of protons N pr and neutrons N n through the coefficient B A , the so-called coalescence parameter:…”

Antideuteron and deuteron production in midcentral Pb+Pb collisions at 158AGeV

“…This approach [16,17] relates the invariant yield of Z-charged A-clusters (A denotes the atomic mass number and P the momentum) to the product of the yields of protons (p) and neutrons (n) as…”

“…In a simplified coalescence approach [16,17], (anti)nucleon bound states are formed from (anti)nucleons which are close in momentum and configuration space. Their production is usually characterized by the coalescence factor B A which relates the invariant yield of a cluster of size A to the A th power of the proton yield.…”