The simultaneous measurement of the spatial coordinates and times of psBAR annihilating at rest in a H-2 target at very low density rho (rho/rho0 < 10(-2), rho0 being the STP density) gives the possibility of evaluating the behavior of the pBAR stopping power in H-2 at low energies (below 120 keV). It is different from that of protons (the Barkas effect). Moreover, it is shown that a rise at low-energy values ( less than or similar to 1 keV) is needed to agree with experimental data.
Antiproton Stopping Power In Hydrogen Below 120 Kev and the Barkas Effect
BALESTRA, Ferruccio;BONAZZOLA, Giancarlo;BRESSANI, Tullio;BUSSA, Maria Pia;BUSSO, Luigi;COSTA, Sergio;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;PANZIERI, Daniele;PIRAGINO, Guido;ZOSI, Gianfranco
1993-01-01
Abstract
The simultaneous measurement of the spatial coordinates and times of psBAR annihilating at rest in a H-2 target at very low density rho (rho/rho0 < 10(-2), rho0 being the STP density) gives the possibility of evaluating the behavior of the pBAR stopping power in H-2 at low energies (below 120 keV). It is different from that of protons (the Barkas effect). Moreover, it is shown that a rise at low-energy values ( less than or similar to 1 keV) is needed to agree with experimental data.
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