5-9 September 2011
Austrian Academy of Sciences, Vienna
Europe/Vienna timezone
Thanks to all participants and have a good and safe trip home!

Total pbar He-3 and pbar He-4 cross sections at low and intermediate energies

Not scheduled
Theatersaal (Austrian Academy of Sciences, Vienna)


Austrian Academy of Sciences, Vienna

Sonnenfelsgasse 19 1010 Vienna Austria
Poster Hadron Physics


Dr Yury Uzikov (JINR Dubna)


The preparation of an intense beam of polarized antiprotons is {\it the} crucial point for the physics program proposed by the PAX collaboration [1] at the future FAIR facility in Darmstadt. A possibility to overcome this experimental challenge is seen in elastic scattering of antiprotons off a polarized $^1$H target [2]. Another possibility is to use the interaction of antiprotons with a polarized deuterium target [3]. As was shown in Ref. [3] on the basis of the Glauber theory with elementary {$\bar p N$} amplitudes taken from the J\"ulich models of the $\bar N N$ interaction [4], the ${\bar p}{\vec d}$ interaction could provide similar or even more effective polarization of the antiprotons as the $\bar p p$ interaction. This conjecture can be checked at a planned AD experiment [5]. The next step is to study scattering of antiprotons off a polarized $^3{\rm He}$ target. Since the polarization of the $^3{\rm He}$ is carried mainly by the neutron, the $\bar p n$ amplitudes are expected to dominate the spin observables of this reaction. In the present work we calculate spin-dependent cross sections of $\bar p ~^3{\rm He}$ interaction on the basis of an approach similar to that developed in Ref.~[3]. In order to check the validity of the Glauber approximation at low energies we calculated also the $\bar p ~^4{\rm He}$ differential cross section at 600 MeV/c beam momentum and its total annihilation cross section at 200 MeV/c and 600 MeV/c, where data are available, and found good agreement with the measurements. The calculated annihilaton cross section for $\bar p ~^3{\rm He}$ is also in agreement with the available data [6] at 200 MeV/c. The polarization efficiency for $\bar p ~^3{\rm He}$ is estimated within the single-scattering approximation. [1] V.~Barone {\it et al.} [PAX Collaboration], arXiv:hep-ex/0505054. [2] F. Rathmann {\it et al.}, Phys.\ Rev.\ Lett. {\bf 94} (2005) 014801. [3] Yu.N.~Uzikov, J.~Haidenbauer, Phys. Rev. C {\bf 79} (2009) 024617. [4] T.~Hippchen, J.~Haidenbauer, K.~Holinde, V.~Mull, Phys. Rev. C {\bf 44} (1991) 1323. [5] C.~Barschel {\it et al} [PAX Collaboration], arXiv:0904.2325[nucl-ex]. [6] F. Balestra {\it et al.}, Phys. Lett. B {\bf 215} (1988) 247.

Primary author

Dr Yury Uzikov (JINR Dubna)


Dr Bekzat Prmantaeva (L.N. Gumilev Eurasian National University, Astana, Kazakhstan) Dr Johann Haidenbauer (Institute for Advanced Simulation, Forschungszentrum J\"ulich,)

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