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奇异粒子的性质及其产生和衰变

霍安祥

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奇异粒子的性质及其产生和衰变

霍安祥

THE PROPERTIES, PRODUCTION AND DECAY OF STRANGE PARTICLE

HO AN-SHING
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  • 用一架30厘米×30厘米×10厘米磁场为6200高斯的云室,在海拔3185米的云南落雪高山实验室拍摄了30000对照片,获得105个V0,而可以进行分类的有43个。其中有26个θ10,16个Λ0和一个θ20。本文对θ10,Λ0和一个θ20进行了研究,其结果如下:1)Q值,Q(Λ0)=(36.2±2.5)Mev,Q(θ10)=(233±11)Mev;2)平均寿命,τ(Λ0)=(3.19-0.92+2.42)×10-10秒,τ(θ10)=(1.14-0.27+0.49)×10-10秒;3)动量分布与以前的工作没有显著差别;4)N(Λ0)/N(θ10)=0.51±0.22(权衡数);5)Λ0和θ10在质心系的衰变角分布没有明显的不对称性;6)一个θ20在静止坐标系寿命为~10-9秒,衰变类型可能为θ20→π-+π++π0或者θ20→π±+μ?+ν。
    The cloud-chamber has a volume 30×30×10 cm3 in a maguetic field of 6200 gauss, which is operated at a 3185m mountain altitude. In a set of 30000 pairs of photographs taken, 105 events of the decay of neutral V particles and 21 of the decay of charged particles wore observed. It is seen that 16 events have been classified as due to the decay of ∧0 particles, 26 as due to the decay of θ10 particles, one as decay of a θ20 particle and 62 as nonclassified. We have studied the following properties of the ∧0 and θ0 particles, the results of which are summamed as follows: 1) Q values Q(Λ0)=(36.2±2.5)Mev, Q(θ10)=(233±11)Mev; 2)mean lifotimes τ(Λ0)=(3.19-0.92+2.42)×10-10sec,τ(θ10)=(1.14-0.27+0.49)×10-10sec; 3) The Momentum distributions found for ∧0 and θ0 particles have no appreciable difference with earlier results;4) N(∧0)/N(θ10)=0.51±0.22 (corrected number in lead);5) The angular distributions of the decay products of the ∧0 and θ0 particles in the rest system have no marked asymmetry;6) The lifetime of one θ20 particle is estimated to be :10-9 sec. in the rest system. The decay mode of this θ20 particle is probably θ20→π-+π++π0 or θ20→π±+μ?+ν.
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  • 文章访问数:  7550
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出版历程
  • 收稿日期:  1959-01-23
  • 刊出日期:  1959-05-20

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