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The first hypernuclei production experiment using a beam of heavy ions from the Lawrence Berkeley Laboratory Bevatron is described. Mass 16 hypernuclei were produced by 2.1 GeV/ nucleon 0 ions incident on a polyethylene target. These relativistic hypernuclei were studied with large gap spark chambers that were electronically triggered by the low momenturn K' meson produced in association. Analysis of 22 events yields a mean lifetime 7( +) = (0. 86+0'&3&) x 10 sec.NUCLEAR REACTIONS Hypernuclei ( 0, NA or OA) E+, E =2.1 GeV/nucleon, polyethylene target, 0'~roughly measured; mean lifetime of mass 16 hypernuclei measured.

unpublished). The accuracy of the coding of the amplitudes and the relevant kinematics into the fitting program was checked in a variety of ways. The isobar-model amplitudes were calculated for a set: of standard events and compared with the amplitudes calculated by other programs independently coded at Lawrenco Berkeley Laboratory, Berkeley; SLAC, Stanford; and CEN, Saelay. In addition, Monte Carlo events were used to generate a variety of mass and angular distributions fom: each wave of Table 111, and these were checked to be physically consistent with the quantum numbers. The polarization calculations were checked explicitly by hand for several events.article Data Group, 9ev. Mod. Phys. 43, S l (1971).'O~he following masses were used to calculate the mixing angle: nzN =I515 515, mx=1670 k10, mA =1690*10, mx=1832-t37, and mA=1518 *2 MeV. "R. Barloutaud (private communication).2 2~h e analysis of Ref. 5 uses an expression for this ratio which yields 3.3. We believe that the expression incorrectly normalizes the Breit-Wigner weight used to calculate an average 8(1385) momentum over the Dalitz plot. Tka normalization of this weight should be independent of the incident momentum. Zf this change i s made, their expression yields a result consistent with ours.

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