Search for 3n and 4n in the reactions 7Li+11B
Belozerov A. V., Borcha K., Dlougy Z., Kalinin A. M., Tyau N.H., Penionzhkevich Yu. E.
The energy spectra of 140 and 150 at an angle of 8° have been measured in the reaction 7Li (88 MeV) + UB in an effort to obtain information on the partners in the output channel of the reaction: the 4n and 3n systems. The energy spectra are described well by curves of the phase space for multiparticle decay in the output channel without a final-state interaction. The 140 spectrum, however, has an indication of a possible formation of a quasistationary 4n. The limits on the cross section for the production of bound 4n and 3n systems in this reaction are 1 and 10 nb/sr, respectively.