Hypernuclear spectroscopy of products from Li-6 projectiles on a carbon target at 2 A GeV
- Rappold, C.
- Kim, E.
- Nakajima, D.
- Saito, T. R.
- Bertini, O.
- Bianchin, S.
- Bozkurt, V.
- Kavatsyuk, M.
- Ma, Y.
- Maas, F.
- Minami, S.
- Oezel-Tashenov, B.
- Yoshida, K.
- Achenbach, P.
- Ajimura, S.
- Aumann, T.
- Gayoso, C. Ayerbe
- Bhang, H. C.
- Caesar, C.
- Erturk, S.
- Fukuda, T.
- Gokuzum, B.
- Guliev, E.
- Hiraiwa, T.
- Hoffmann, J.
- Ickert, G.
- Ketenci, Z. S.
- Khaneft, D.
- Kim, M.
- Kim, S.
- Koch, K.
- Kurz, N.
- Le Fevre, A.
- Mizoi, Y.
- Moritsu, M.
- Nagae, T.
- Nungesser, L.
- Okamura, A.
- Ott, W.
- Pochodzalla, J.
- Sakaguchi, A.
- Sako, M.
- Schmidt, C. J.
- Sekimoto, M.
- Simon, H.
- Sugimura, H.
- Takahashi, T.
- Tambave, G. J.
- Tamura, H.
- Trautmann, W.
- Voltz, S.
- Yokota, N.
- Yoon, C. J.
DOIAbstract
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 Li-6 projectiles on a carbon target at 2 A GeV was performed. Signals of the Lambda-hyperon and H-3(Lambda) and H-4(Lambda) hypernuclei were observed for final states of p + pi(-), He-3 + pi(-) and He-4 + 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(-43)(+56) +/- 45 ps for Lambda, 183(-32)(+42) +/- 37 ps for H-3(Lambda), and 140(-33)(+48) +/- 35 ps...
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