Inscriere cercetatori

Daca aveti cont Ad Astra si de Facebook, intrati pe pagina de profil pentru a da dreptul sa va logati pe site doar cu acest buton.

Site nou !

Daca nu va puteti recupera parola (sau aveti alte probleme), scrieti-ne la pagina de contact. Situl vechi se gaseste la adresa


Preshower detector for pi+ pi- hadronic atom studies

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: M. Pentia, C. Ciocarlan, S. Constantinescu, M. Gugiu, G. Caragheorgheopol

Editorial: Nuclear Instruments and Methods in Physics Research, Section A,, 603, p.309-318, 2009.


Want create site? Find Free WordPress Themes and plugins.

A preshower(PSh) detector has been prepared,tested and used at the CERN-DIRAC experiment. The aim of this experiment was to test some nonperturbative QCD predictions by measuring pionium(pi+pi- hadronic atom)lifetime. In this context the PSh detector,together with the Cherenkov detector, pursued to reject the background electron pairs in the region 1-4GeV where the pion pairs from atom breakup were present.
The technique used for pion/electron separation was to probe the electron shower development in the early formation stage in Pb converter. We have studied the dependence of the amplitude spectra on particle momentum and converter and scintillator thickness. The estimated electron rejection efficiency was better than 85% with a pion loss less than 5% for a preshower detector with Pb converter thickness wPb=2.5cm and scintillator slab wSc=1 cm.
The PSh track efficiency within the DIRAC setup has been measured with a global efficiency per arm better than 99%, slab efficiency per arm better than 96% and corresponding pair events efficiency per arm ~99% and per slab ~93%.

Did you find apk for android? You can find new Free Android Games and apps.

Cuvinte cheie: Detector, Particle physics