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The probability P(b) of forming K vacancies in 60-MeV I + Ag collisions with center-of-mass scattering angles Â¿cm between 20Â° and 144Â° was measured. The measured probability varies approximately as sin2Â¿cm, as predicted for the kinematic peak part of 2pÂ¿-2pÂ¿ rotatational coupling. We conclude that while the shape of P(b) indicates that 2pÂ¿-2pÂ¿ rotational coupling is important in the creation of K vacancies, the probability of creating the initial 2pÂ¿ vacancy must be impact parameter dependent. In other collisions where a rise in P(b) has been observed at low impact parameters, it is possible that the rise is due not to a kinematic peak, but to a contribution from 1sÂ¿ vacancy production.
Date of Publication: April 1981