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    Latest Results From the HypHI Experiments at GSI: Hypernuclear Spectroscopy with Heavy Ion Induced Reactions
    (SPRINGER WIEN, 2013) Saito, T. R.; Kim, E.; Nakajima, D.; Rappold, C.; Bianchin, S.; Borodina, O.; Yoshida, K.
    The HypHI Phase 0 experiment with Li-6 projectiles at 2 AGeV on a carbon target has been performed at GSI in order to demonstrate the feasibility of hypernuclear spectroscopy with induced reaction of heavy ion beams. Current data analyses have shown peaks in invariant mass distributions of p + pi (-) for I >, He-3+ pi (-) for (3) (I >) H and He-4 + pi (-) for (4) (I >) H. Lifetime values for the corresponding peaks have been also deduced, which are in good agreement with the former known values.
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    On the measured lifetime of light hypernuclei H-3(Lambda) and H-4(Lambda)
    (ELSEVIER SCIENCE BV, 2014) Rappold, C.; Saito, T. R.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Kavatsyuk, M.; Yoshida, K.
    A statistical combination of the experimental lifetime estimations available in the literatures is performed for H-3(Lambda) and H-4(Lambda), including several recent measurements. The combined average values of the lifetime for H-3(Lambda) and H-4(Lambda) are respectively 216(-16)(+19) ps and 192(-18)(+20) ps with a reduced chi(2) of 0.89 and 0.48. A new insight into the lifetime estimation of the HypHI Phase 0 experiment by a Bayesian approach is also presented. In this approach, several different prior distributions including the combination of previous lifetime data and a Jeffrey prior are used. The principal mode and the smallest credible interval at 68% of the posterior distribution, given by the prior belief of the previous measurements, are 217(-16)(+19) ps and 194(-18)(+20) ps respectively for H-3(Lambda) and H-4(Lambda). The two employed approaches have revealed that the lifetime of hypernuclei H-3(Lambda) and H-4(Lambda) can be shorter than the Lambda-hyperon lifetime. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.