R. Anholt

Theory of molecular-orbital and compound-nucleus x-ray emission in heavy-ion-atom collisions with nuclear sticking

AbstractCalculations are made of x-ray emission in head-on 200-MeV (lab) Ni+Ni and 860-MeV (lab) Yb+Yb collisions for various values of the compound nucleus lifetimeτ. TheK x-ray emission probability is obtained by coherently summing the amplitude for a molecular-orbital x-ray transition from the 2pσ, 2pπ, 3pσ, or 3pπ to the 1sσ molecular orbital with the amplitude for a compound-nucleus x-ray transition from the united-atom 2p or 3p levels to the 1s level while the projectile and target nuclei stick. If ωKατn

Impact-parameter dependence of 1 sσ vacancy production in 4.6-MeV/a.m.u. Xe + Pb collisions

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Molecular theory ofK-vacancy production in heavy-ion-atom collisions at small impact parameters

n1, where ωKατ is the united-atom transition frequency, only molecular orbital x-rays are observed. If ωKατn

Impact parameter dependence of Ag K-vacancy production by 60 MeV I ions

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Calculations of molecular-orbital — separated-atom x-ray coincidences

n 1, compound nucleus x-rays are observed. Independent of the projectile velocity, the atomic number of the combined system, and the mechanism for the creation of the 1sσ vacancy, the compound-nucleus x-rays become sufficiently sharp at ωKατ ≈ 20 to permit the measurement of the united-atomKα andKβ x-ray energies to an accuracy of <±5%. The lifetime of the compound nucleus may be sufficiently long to observeK x-rays of 100≲Zu≲140 in fusion-fission nuclear reactions.

K-shell ionization in 7.5- and 8.6-MeV/a.m.u. U+U collisions at very small impact parameters

Probabilities for PbK-shell ionization in 5.9-, 7.2-, and 8.5-MeV/a.m.u. Xe+Pb collisions for impact parameters between 10 and 60 fm are reported. The measured probabilities are compared with theories of 1sσ-vacancy production.