TY - JOUR

T1 - Experimental study of relativistic hypernuclei using the HYBS-spectrometer

AU - HYBS

AU - Abdurakhimov, A. U.

AU - Aksinenko, V. D.

AU - Anikina, M. H.

AU - Avramenko, S. A.

AU - Bannik, B. P.

AU - Butenko, V. A.

AU - Glagoleva, N. S.

AU - Golokhvastov, A. I.

AU - Grachev, A. G.

AU - Dementiev, E. A.

AU - Drozdov, V. A.

AU - Kaminsky, N. I.

AU - Khorozov, S. A.

AU - Kirillov, A. D.

AU - Kozubsky, E. V.

AU - Kulakov, B. A.

AU - Kuznetsov, A. A.

AU - Kuznetsova, E. S.

AU - Luboshitz, V. L.

AU - Lukstins, J. R.

AU - Mandrik, O. Yu

AU - Maniakov, P. K.

AU - Matushin, A. T.

AU - Matushin, V. T.

AU - Mukhin, S. V.

AU - Nikityuk, N. M.

AU - Okhrimenko, L. S.

AU - Okonov, E. O.

AU - Ostanevich, T. G.

AU - Radomanov, V. B.

AU - Rozhnyatovskaya, S. A.

AU - Rukoyatkin, P. A.

AU - Ryakhovsky, V. N.

AU - Saitov, I. S.

AU - Sedykh, S. A.

AU - Svetov, A. L.

AU - Vardenga, G. L.

AU - Zavialov, V. F.

AU - Belikov, Yu A.

AU - Kondratiev, V. P.

AU - Krasnov, L. V.

AU - Shevchenko, I. E.

AU - Stepanov, I. V.

AU - Gaevsky, K.

AU - Mirkovsky, Ya

AU - Pavlovsky, Z.

AU - Piatkovsky, A.

AU - Khusainov, E. K.

AU - Nurgozhin, N. N.

AU - Pol, Yu S.

PY - 1989/8

Y1 - 1989/8

N2 - The method and the results of an experiment on the study of relativistic Λ 4 H and Λ 3 H production in interactions of 18 GeV/c4He nuclei with CH2 target nuclei are presented. The experiment was performed using the HYBS-spectrometer. The main registering part of the spectrometer is a (2×0.6×1)m3 streamer chamber placed in a magnetic field of 0.9 T. The streamer chamber was triggered when the beam4He nucleus lost one charge unit in the target and then again became double-charged inside the chamber fiducial volume according to the selection criteria for Λ 3,4 H hypernucleus production and its mesonic decay with the He nucleus in the final state. After scanning of the pictures, measurements of two-prong events and careful analysis, events of the decays Λ 4 H→4He+π- and Λ 3 H→3He+π- were identified. The estimates of the Λ 4 H production cross-section (∼0.4 μb) and its mean lifetime (∼2.2·10-10s) were obtained. A comparison with the results of other experiments and theoretical calculations is made. By the way, the cross-section of the charge exchange reaction3H+Ne→3He+π-++...(∼1 mb) was estimated. The work has been performed at the Laboratory of High Energies, JINR, Dubna.

AB - The method and the results of an experiment on the study of relativistic Λ 4 H and Λ 3 H production in interactions of 18 GeV/c4He nuclei with CH2 target nuclei are presented. The experiment was performed using the HYBS-spectrometer. The main registering part of the spectrometer is a (2×0.6×1)m3 streamer chamber placed in a magnetic field of 0.9 T. The streamer chamber was triggered when the beam4He nucleus lost one charge unit in the target and then again became double-charged inside the chamber fiducial volume according to the selection criteria for Λ 3,4 H hypernucleus production and its mesonic decay with the He nucleus in the final state. After scanning of the pictures, measurements of two-prong events and careful analysis, events of the decays Λ 4 H→4He+π- and Λ 3 H→3He+π- were identified. The estimates of the Λ 4 H production cross-section (∼0.4 μb) and its mean lifetime (∼2.2·10-10s) were obtained. A comparison with the results of other experiments and theoretical calculations is made. By the way, the cross-section of the charge exchange reaction3H+Ne→3He+π-++...(∼1 mb) was estimated. The work has been performed at the Laboratory of High Energies, JINR, Dubna.

KW - 21.80 - Hypernuclei

UR - http://www.scopus.com/inward/record.url?scp=51249175382&partnerID=8YFLogxK

U2 - 10.1007/BF02734881

DO - 10.1007/BF02734881

M3 - Article

AN - SCOPUS:51249175382

VL - 102

SP - 645

EP - 652

JO - La Rivista del Nuovo Cimento

JF - La Rivista del Nuovo Cimento

SN - 0393-697X

IS - 2

ER -