# Antiproton annihilation on light nuclei at very low energies

Abstract : 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)
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Journal articles

Cited literature [3 references]

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Submitted on : Monday, May 15, 2000 - 3:01:27 PM
Last modification on : Thursday, November 19, 2020 - 12:58:27 PM
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### Identifiers

• HAL Id : in2p3-00005362, version 1

### Citation

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

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