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Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV

Abstract : A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy-ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6Li projectiles on a carbon target at 2 AGeV was performed. Signals of the \Lambda-hyperon and 3\Lambda H and 4\Lambda H hypernuclei were observed for final states of p+\pi^-, 3He+\pi^- and 4He+\pi^-, respectively, with significance values of 6.7, 4.7 and 4.9\sigma. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be $262 ^{+56}_{-43} \pm 45$ ps for \Lambda, $183 ^{+42}_{-32} \pm 37$ ps for 3\Lambda H, and $140 ^{+48}_{-33}\pm 35 $ ps for 4\Lambda H.
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http://hal.in2p3.fr/in2p3-00835771
Contributor : Sylvie Flores <>
Submitted on : Wednesday, June 19, 2013 - 4:03:37 PM
Last modification on : Friday, June 22, 2018 - 9:34:27 AM

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C. Rappold, E. Kim, D. Nakajima, T. R. Saito, O. Bertini, et al.. Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV. Nuclear Physics A, Elsevier, 2013, ⟨10.1016/j.nuclphysa.2013.05.019⟩. ⟨in2p3-00835771⟩

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