Antiproton annihilation on light nuclei at very low energies

K.V. Protasov (1) , G. Bonomi , E. Lodi Rizzini , A. Zenoni

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

The recent experimental data obtained by the OBELIX group on $\bar{p}$D and $\bar{p}^4$He total annihilation cross sections are analyzed. The combined analysis of these data with existing antiprotonic atom data allows, for the first time, the imaginary parts of the S-wave scattering lengths for the two nuclei to be extracted. The obtained values are: $Im a^{sc}_0 = [- 0.62 \pm 0.02 ({stat}) \pm 0.04 ({sys})] fm$ for $\bar{p}$D and $Im a^{sc}_0 = [- 0.36\pm 0.03({stat})^{+0.19}_{-0.11}({sys})] fm$ for $\bar{p}^4$He. This analysis indicates an unexpected behaviour of the imaginary part of the $\bar{p}$-nucleus S-wave scattering length as a function of the atomic weight A: $|Im a^{sc}_0|$ ($\bar{p}$p) > $|Im a^{sc}_0|$ ($\bar{p}$D) > $|Im a^{sc}_0|$ ($\bar{p}^4$He)

Mots clés: Marshall McLuhan; communication; medium; message; global village; historicism; history of communication; globalization; Shannon; Laswell

Domaines: Physique des Hautes Energies - Théorie [hep-th]

K.V. Protasov, G. Bonomi, E. Lodi Rizzini, A. Zenoni. Antiproton annihilation on light nuclei at very low energies. European Physical Journal A, 2000, 7, pp.429-434. ⟨10.1007/s100500050413⟩. ⟨in2p3-00005362⟩