This paper describes an experimental search for antiproton decay at the Fermilab Antiproton Accumulator. The E868 (APEX) experimental setup is described. The APEX data is expected to be sensitive to antiproton decay if the antiproton lifetimes is less than a few times 100 000 years.

A search for antiproton decay has been made at the Fermilab Antiproton Accumulator. Limits are placed on six antiproton decay modes which contain a final-state muon.

An enhancement of antiprotons produced in p + d reaction in comparison with ones in p + p elementary reaction is investigated. In the neighborhood of subthresh-old energy the enhancement is caused by the difference of available energies for antiproton production. The cross section in p + d reaction, on the other hand, becomes just twice of the one in elementary p + p reaction at the incident en...

In this study, we propose a tumor monitoring technique using prompt gamma rays emitted from the reaction between an antiproton and a boron particle, and verify the improvement of the therapeutic effectiveness of the antiproton boron fusion therapy compared with proton and antiproton beam without boron. The tumor monitoring system during the antiproton therapy was simulated using the Monte Carlo...

An enhancement of antiprotons produced in p+ d reaction in comparison with ones in p+p elementary reaction is investigated. In the neighborhood of subthreshold energy the enhancement is caused by the difference of available energies for antiproton production. The cross section in p+ d reaction, on the other hand, becomes just twice of the one in elementary p+ p reaction at the incident energy f...

Antiprotonic helium, a neutral exotic three-body system consisting of a helium nucleus, an electron and an antiproton, is being studied at the Antiproton Decelerator of CERN by the ASAUCSA collaboration. Using laser spectroscopy of the energy levels of the antiproton in this system and comparison to theory, a value of the antiproton-to-electron mass ratio with an error of 3 ppb could be obtaine...

Relativistic formulae for spin averaged and spin dependent one photon exchange differential cross sections are developed for spin half fermion fermion elastic scattering. Spin transfer cross sections are important for the Polarized Antiproton eXperiments (PAX) project at GSI Darmstadt. In particular, cross sections for polarization transfer in antiproton electron p̄ e↑ −→ p̄ ↑ e and antiproton pr...

We study the effects of N * (1440) resonance on the production of kaons, an-tikaons and antiprotons in heavy-ion collisions at subthreshold energies. Using free-space widths for the ∆(1232) and the N * (1440) resonance and free-space thresholds for particle production, it is found that the N *-baryon interactions contribute about 10%, 25% and 80% to the yield of kaon, antikaon and antiproton, r...

New measurements with good statistics will make it possible to observe the time variation of cosmic antiprotons at 1 AU through the approaching peak of solar activity. We report a new computation of the interstellar antiproton spectrum expected from collisions between cosmic protons and the interstellar gas. This spectrum is then used as input to a steady-state drift model of solar modulation, ...

An enhancement of antiprotons produced in p + d reaction in comparison with ones in p + p elementary reaction is investigated. In the neighborhood of subthresh-old energy the enhancement is caused by the difference of available energies for antiproton production. The cross section in p + d reaction, on the other hand, becomes just twice of the one in elementary p + p reaction at the incident en...