Abstract
The Doppler shift and the anisotropy of the MO X-rays above the separated-atomK-lines have been measured in208Pb+208Pb and209Bi+209Bi collisions at beam energies between 4.2 and 4.8 MeV/u. The Doppler shift is found to be consistent with a source moving with 90% of the center of mass velocity of the colliding system. One peak is observed in the anisotropy spectrum. This peak might be attributed to transitions from the continuum into the minimum of the 2p 1/2 σ MO or from the 3p 1/2 σ and 2p 3/2 σ MO's into the 2 sσ MO near the united atom limit. Radiative electron capture and secondary electron bremsstrahlung could be excluded as major sources of the observed radiation. Contrary to lighter systems no anisotropy corresponding to transitions into the 1 sσ orbital could be observed.
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We thank D.L. Clark and R. Diamond for assisting with the experiments at the SUPERHILAC, Berkeley, and W. Enders at the UNILAC, Darmstadt. We are indebted to R. Wagner, Institute of Nuclear Physics, KFA Jülich, for producing the highly enriched208Pb and to H. Folger, GSI, for preparing the targets. One of us (WEM) acknowledges with gratefulness receipt of a Tenured Faculty Development Award, supported by Lilly Endowment, Inc., from Stanford University and the hospitality of the Laboratorium für Kernphysik of the ETH during a 4-month stay there at the time these experiments were in progress. This work was supported in part by the U.S. National Science Foundation, the Swiss National Science Foundation and the Danish Natural Science Research Council.
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Stoller, C., Morenzoni, E., Wölfli, W. et al. MO X-ray angular distributions from 1 GeV208Pb+208Pb and209Bi+209Bi collisions. Z Physik A 297, 93–99 (1980). https://doi.org/10.1007/BF01421464
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DOI: https://doi.org/10.1007/BF01421464