CHANGES IN THE ANNIHILATION DELAY-TIME DISTRIBUTION OF STOPPED ANTIPROTONS IN HELIUM GAS, DUE TO CONTAMINANTS .2.

Authors
BERTIN A BRUSCHI M DANTONE I DECASTRO S FERRETTI A GALLI D GIACOBBE B MARCONI U PICCININI M CESARI NS SPIGHI R VECCHI S VEZZANI A VIGOTTI F VILLA M VITALE A ZOCCOLI A CORRADINI M DONZELLA A RIZZINI EL VENTURELLI L ZENONI A CICALO C MASONI A PUDDU G SERCI S TEMNIKOV P USAI G ABLEEV VG DENISOV OY GORCHAKOV OE PRAKOV SN ROZHDESTVENSKI AM SAPOZHNIKOV MG TRETYAK VI GIANOTTI P GUARALDO C LANARO A LUCHERINI V NICHITIU F PETRASCU C ROSCA A CAVION C GASTALDI U LOMBARDI M VORONIN A MORANDO M RICCI RA BENDISCIOLI G FILIPPINI V FONTANA A MONTAGNA P ROTONDI A SAINO A SALVINI P AGNELLO M IAZZI F MINETTI B BALESTRA F BOTTA E BRESSANI T BUSSA MP BUSSO L CALVO D CERELLO P COSTA S DISEP F FAVA L FELICIELLO A FERRERO L FILIPPI A GARFAGNINI R GRASSO A MAGGIORA A MARCELLO S PANZIERI D PARENA D ROSSETTO E TOSELLO F MARGAGLIOTTI GV PAULI G RIZZO C TESSARO S ZAVATTINI E SANTI L
Citation
A. Bertin et al., CHANGES IN THE ANNIHILATION DELAY-TIME DISTRIBUTION OF STOPPED ANTIPROTONS IN HELIUM GAS, DUE TO CONTAMINANTS .2., Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields, 110(4), 1997, pp. 419-428
Citations number
9
Categorie Soggetti
Physics, Particles & Fields
Journal title
Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields → ACNP
ISSN journal
11241861
Volume
110
Issue
4
Year of publication
1997
Pages
419 - 428
Database
ISI
SICI code
1124-1861(1997)110:4<419:CITADD>2.0.ZU;2-9
Abstract
A different type of analysis was performed to study the effect of cont aminants on the temporal distribution of delayed annihilations of anti protons stopped in helium gas, with respect to some first results publ ished in ABLEEV et. al. (Nuovo Cimento A, 107 (1994) 1325). A more obj ective criterion was established to single out a slow part in the tota l delayed component, in order to deduce from this, for each case, the mean value of the product (<(upsilon sigma)over bar>)(c,l) of the quen ching cross-section and the mean velocity of contaminant molecules, an d the fraction of the slow component eta(c,l). The fraction eta(c,l) w as found to be amazingly stable for each impurity, independent of the concentration: around 79% of the total delayed component for all the a tomic impurities (Ar, Ne, Xe) and 64% for the molecular ones (H-2, N-2 ).