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Emission of helium ions after antiproton annihilation in nuclei

1988; Elsevier BV; Volume: 485; Issue: 3-4 Linguagem: Inglês

10.1016/0375-9474(88)90547-7

1873-1554

W. Markiel, H. Daniel, T. von Egidy, F. J. Hartmann, Peter Hofmann, W. Kanert, H.S. Plendl, Klaus Ziock, Roger M. Marshall, H. Machner, G. Riepe, J. J. Reidy,

Mass Spectrometry Techniques and Applications

Spectra of hydrogen and helium ions emitted after stopped antiproton annihilation in nuclei have been measured with a Si-detector telescope. Targets of 12C, 40Ca, 63Cu, 92Mo, 98Mo and 238U were used. The 3He and 4He energy spectra can be fitted with the exponential function e−E/T. The parameter T is essentially independent of the target mass number A. A simple pickup model reproduces the 4He/3He ratios as a function of Z and N (target proton and neutron number). The proton spectra from the 238U target indicate that some protons are also emitted by the fission fragments.