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

• Published in: Nuclear physics. A Vol. 913; pp. 170 - 184
• Main Authors: Rappold, C., Kim, E., Nakajima, D., Saito, T.R., Bertini, O., Bianchin, S., Bozkurt, V., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Özel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Ayerbe Gayoso, C., Bhang, H.C., Caesar, C., Erturk, S., Fukuda, T., Göküzüm, B., Guliev, E., Hiraiwa, T., Hoffmann, J., Ickert, G., Ketenci, Z.S., Khaneft, D., Kim, M., Kim, S., Koch, K., Kurz, N., Le Fèvre, 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.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 02.09.2013
• Subjects: 3,4H Λ-hypernuclei invariant mass distribution; 3,4H Λ-hypernuclei mass; 6Li, 4H; 6Li, t; C(6Li, X); Compared with other data; deduced; formula omitted; lifetime measurement; measured; Nuclear reactions; Λ mass; deduced; measured; Compared with other data; lifetime measurement; Nuclear reactions
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2013.05.019

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 2A GeV was performed. Signals of the Λ-hyperon and HΛ3 and HΛ4 hypernuclei were observed for final states of p+π−, He3+π− and He4+π−, respectively, with significance values of 6.7, 4.7 and 4.9σ. 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 Λ, 183−32+42±37 ps for HΛ3, and 140−33+48±35 ps for HΛ4.