[en] Relativistic hypernuclei are registered with unambigous identification for the first time. The production cross section of Λ4H on a CH2 target with a 4He beam at 18 GeV/c is 0.4+0.4 μb, 0.4-0.2 μb. The mean momentum and mean lifetime are (16.7±0.2) GeV/c and (2.2+0.5, 2.2-0.4)x10-10 s respectively. 15 refs