An event of peripheral collision of a relativistic oxygen nucleus.which immediately disintegrates into four helium nuclei,a quarternary fragmentation event,has been measured exclusively,and the mechanism of this event...An event of peripheral collision of a relativistic oxygen nucleus.which immediately disintegrates into four helium nuclei,a quarternary fragmentation event,has been measured exclusively,and the mechanism of this event is discussed.The quarternary fragmentation phenomenon may provide an experimental evidence for the cluster model of oxygen nucleus.展开更多
Using the 27 KG magnetic field produced by a superconducting solenoid we have searched for trapped magnetic monopoles in a magnetite sample from North China.We have scanned the nuclear emulsion both for low ionizing t...Using the 27 KG magnetic field produced by a superconducting solenoid we have searched for trapped magnetic monopoles in a magnetite sample from North China.We have scanned the nuclear emulsion both for low ionizing tracks and heavily ionizing tracks,and the plastic film for heavily ionizing tracks of magnetic monopoles.We obtain a 90%confidence level upper limit of 1.8×10^(-26) monopoles per nucleon in the magnetite sample.展开更多
文摘An event of peripheral collision of a relativistic oxygen nucleus.which immediately disintegrates into four helium nuclei,a quarternary fragmentation event,has been measured exclusively,and the mechanism of this event is discussed.The quarternary fragmentation phenomenon may provide an experimental evidence for the cluster model of oxygen nucleus.
文摘Using the 27 KG magnetic field produced by a superconducting solenoid we have searched for trapped magnetic monopoles in a magnetite sample from North China.We have scanned the nuclear emulsion both for low ionizing tracks and heavily ionizing tracks,and the plastic film for heavily ionizing tracks of magnetic monopoles.We obtain a 90%confidence level upper limit of 1.8×10^(-26) monopoles per nucleon in the magnetite sample.
