Radiative and non-radiative electron capture from carbon atoms by relativistic helium ions

A. Gójska, D. Chmielewska, P. Rymuza, J. Rzadkiewicz, Z. Sujkowski, T. Adachi, H. Fujita, Y. Fujita, Y. Shimbara, K. Hara, Y. Shimizu, H. P. Yoshida, Y. Haruyama, J. Kamiya, H. Ogawa, M. Saito, M. Tanaka

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    2 Citations (Scopus)


    Interaction of radiation with helium atoms and/or ions is of interest in various astrophysical applications. The reverse reactions of fast 150MeV/amu He++ ions with solid C targets have been studied at the isochronous cyclotron of the RCNP in Osaka, The singly ionized helium ions resulting from capture of the target electrons to the projectile were observed with the use of large magnetic spectrograph. Grand Raiden, set at θ = 0° with respect to the beam. The yield ratios of singly-to-doubly ionized helium ions emerging from thin carbon foils, He+ /He++, have been measured as a function of the foil thickness. Extrapolating the results to zero target thickness permits to determine the cross section values separately for electron stripping from 3He+ ions and for electron capture to 3He++ ions. The radiative and nonradiative contributions to the capture cross section were determined in a separate experiment in which the 84 keV (C.M.) photons were observed in coincidence with the He+ ejectiles. The results are compared with theoretical predictions. Need for improved calculations is noted for all the three processes involved. i.e. for the radiative and non radiative electron capture as well as for the electron stripping.

    Original languageEnglish
    Pages (from-to)181-185
    Number of pages5
    JournalEuropean Physical Journal A
    Issue numberSUPPL. 1
    Publication statusPublished - 2006 Mar

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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