As reported in the previous article we have chosen a system of 3 families S1(u), S2(v), S3(w) and we assumed 3 coordinate lines B,G,l along which we measure u,v,w, so that we can calculate 3 ...base-vectors... ' where the term dvdw comes from the possible non orthogonality of G and l. As the potential is a harmonic function, the prime integral is ( = 1, and this allows a great simplification. We calculate some derivative of base-vectors and the curvature of B-lines.
A new pixel readout prototype has been developed at CERN for high-energy physics applications. This full mixed mode circuit has been implemented in a commercial 0.5
μm CMOS technology. Its radiation ...tolerance has been enhanced by designing all NMOS transistors in enclosed geometry and introducing guardrings wherever necessary. The technique is explained and its effectiveness demonstrated on various irradiation measurements on individual transistors and on the prototype. Circuit performance started to degrade only after a total dose of 600
krad–1.7 Mrad depending on the type of radiation. 10
keV X-rays,
60
Co
gamma-rays, 6.5
MeV protons, and minimum ionizing particles were used. Implications of this layout approach on the circuit design and perspectives for even deeper submicron technologies are discussed.
We report the main results from experiment WA97 on the production of strange and multistrange hadrons at midrapidity in Pb+Pb, p+Pb and p+Be collisions at 158
A GeV/
c. A comparison with some of the ...available models is presented.
Results are presented on hyperon and antihyperon production in Pb–Pb, pPb and pBe collisions at 158 GeV/c per nucleon. Λ, Ξ and Ω yields have been measured at central rapidity and medium transverse ...momentum as functions of the centrality of the collision. Comparing the yields in Pb–Pb to those in pBe interactions, strangeness enhancement is observed. The enhancement increases with the centrality and with the strangeness content of the hyperons, reaching a factor of about 20 for the Ω in the central Pb–Pb collisions
A measurement of strange baryon and antibaryon production in Pb–Pb collisions has been carried out by the NA57 experiment at the CERN SPS, with 40 and 158 AGeV/c beam momentum. Results on Λ, Ξ and Ω ...hyperon yields at mid-rapidity in the most central 53% of Pb–Pb collisions at 40 AGeV/c are presented and compared with those obtained at higher energy, in the same collision centrality range.
The Λ and Ξ− yields per unit rapidity stay roughly constant while those of Ω−, Λ̄, Ξ̄+ and Ω̄+ increase when going to the higher SPS energy. Hyperon yields at the SPS are compared with those from the STAR experiment in sNN=130 GeV Au–Au collisions at RHIC.
Status of the NA57 experiment at CERN SPS Manzari, V; Collaboration, the NA57; Antinori, F ...
Journal of physics. G, Nuclear and particle physics,
03/2001, Letnik:
27, Številka:
3
Journal Article
PDF
