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Anti-proton helium-3 annihilation at 55-MeV/c

Bianconi, A. ; Bonomi, G. ; Bussa, M.P. ; et al.
Phys.Lett.B 492 (2000) 254-258, 2000.
Inspire Record 538722 DOI 10.17182/hepdata.27999

The p̄ 3 He annihilation cross section is measured for the first time in the momentum interval (50÷60) MeV/ c . About 9000 pictures collected by the Streamer Chamber Collaboration (PS179) at LEAR–CERN have been scanned. Six events are found, corresponding to σ ann =1850±700 mb. The result is compared to the set of measurements presently available in the region of low p̄ momentum.

1 data table
Table 1

The mean beam momentum at the center of the fiducial volume = 55 MeV.


Evidence of Isospin Effects in Anti-proton - Nucleus Annihilation

Balestra, F. ; Bossolasco, S. ; Bussa, M.P. ; et al.
Nucl.Phys.A 491 (1989) 572-586, 1989.
Inspire Record 264049 DOI 10.17182/hepdata.37013

Antiproton- 3 He annihilation events at rest have been detected using a self-shunted streamer chamber. The ratio of the cross section for annihilation on neutrons and on protons has been measured (0.467 ± 0.035). It is compared with other results from annihilation on free nucleons, deuterium, 3 He and 4 He. The low value of the ratio seems to indicate a strong isospin dependence of the antinucleon-nucleon P-wave amplitude.

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

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