engleski

Two-neutron emission induced by stopped π− on 9Be, 10B, and 12C

Two neutron in coincidence detected following absorption of negative pions from rest on 9Be, 10B, 12C nuclei. Spectra of final nuclei presented and discussed. The (π−, 2n) process has been studied in a kinematically complete experiment on three neighboring 1p-shell nuclei. Distributions of excitation energy of the residual nuclei, of recoil momentum, of the angle between the emitted neutrons, and the angle between the sum and the difference of the neutron momenta have been measured. From the excitation spectra a striking analogy with (p, 2p) data has been found in the region of p-shell nucleon removal. The possibility of s-shell nucleon removal has been investigated. The data are compared with theoretical predictions.

negative pion absorption ; 9Be, 10B, 12C targets ; coincident neutron pair detected

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