Production of (4)(double Lambda)H hypernuclei

An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one un...

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Published in:Physical review letters 2001-09, Vol.87 (13), p.132504-132504
Main Authors: Ahn, J K, Ajimura, S, Akikawa, H, Bassalleck, B, Berdoz, A, Carman, D, Chrien, R E, Davis, C A, Eugenio, P, Fischer, H, Franklin, G B, Franz, J, Fukuda, T, Gan, L, Hotchi, H, Ichikawa, A, Imai, K, Kahana, S H, Khaustov, P, Kishimoto, T, Koran, P, Kohri, H, Kourepin, A, Kubota, K, Landry, M, May, M, Meyer, C, Meziani, Z, Minami, S, Miyachi, T, Nagae, T, Nakano, J, Outa, H, Paschke, K, Pile, P, Prokhabatilov, M, Quinn, B P, Rasin, V, Rusek, A, Schmitt, H, Schumacher, R A, Sekimoto, M, Shileev, K, Shimizu, Y, Sutter, R, Tamagawa, T, Tang, L, Tanida, K, Yamamoto, K, Yuan, L
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Language:English
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Summary:An experiment demonstrating the production of double-Lambda hypernuclei in (K(-),K(+)) reactions on (9)Be was carried out at the D6 line in the BNL alternating-gradient synchrotron. The technique was the observation of pions produced in sequential mesonic weak decay, each pion associated with one unit of strangeness change. The results indicate the production of a significant number of the double hypernucleus (4)(double Lambda)H and the twin hypernuclei (4)(Lambda)H and (3)(Lambda)H. The relevant decay chains are discussed and a simple model of the production mechanism is presented. An implication of this experiment is that the existence of an S = -2 dibaryon more than a few MeV below the double Lambda mass is unlikely.
ISSN:0031-9007