（4）（双拉姆达）超核的产生。
Production of (4)(double Lambda)H hypernuclei.
作者信息
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
机构信息
Department of Physics, Pusan National University, Pusan 609-735, Korea.
出版信息
Phys Rev Lett. 2001 Sep 24;87(13):132504. doi: 10.1103/PhysRevLett.87.132504. Epub 2001 Sep 5.
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.
在布鲁克海文国家实验室交变梯度同步加速器的D6线上进行了一项实验，该实验演示了在（9）Be上的（K（-），K（+））反应中双拉姆达超核的产生。该技术是观察在介子弱衰变序列中产生的π介子，每个π介子与一个奇异数变化单位相关联。结果表明产生了大量的双超核（4）（双拉姆达）H以及孪生超核（4）（拉姆达）H和（3）（拉姆达）H。讨论了相关的衰变链，并提出了一个简单的产生机制模型。该实验的一个结论是，在双拉姆达质量以下几个兆电子伏特处存在S = -2重子的可能性不大。
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