Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment

ZHOU Yuan; HE Hui-Hai; MU Jun

Chinese Physics C> 2005, Vol. 29> Issue(6) : 549-554

Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment

Institute of High Energy Physics,CAS,Beijing 100049,China2 Department of Physics,Yunnan University,Kunming 650091,China

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Abstract：
The distortion of the secondary charged particle trajectories of EAS in the geomagnetic field distorts the lateral distribution of the secondaries. The variation of the geomagnetic effect with the azimuth angle in different zenith angle intervals for YBJ-ARGO experiment is studied using Monte Carle simulation. The geomagnetic field leads to a stretched lateral distribution of the secondaries, thus both the density of the secondaries near the shower axis and the trigger efficiency of the array decrease. This effect is larger for the showers coming from the north than that from the south, such that the trigger efficiency for the former is lower than that for the latter. The north-south asymmetry becomes more evident with larger zenith angles.

References

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ZHOU Yuan, HE Hui-Hai and MU Jun. Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(6): 549-554.

ZHOU Yuan, HE Hui-Hai and MU Jun. Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(6): 549-554. shu

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Received: 2004-11-04
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Monte Carlo Study for the Effect of Geomagnetic Field on Trigger Efficiency of ARGO-YBJ Experiment

Corresponding author: ZHOU Yuan,

Institute of High Energy Physics,CAS,Beijing 100049,China2 Department of Physics,Yunnan University,Kunming 650091,China

Received Date: 2004-11-04
Accepted Date: 1900-01-01
Available Online: 2005-06-05

Abstract: The distortion of the secondary charged particle trajectories of EAS in the geomagnetic field distorts the lateral distribution of the secondaries. The variation of the geomagnetic effect with the azimuth angle in different zenith angle intervals for YBJ-ARGO experiment is studied using Monte Carle simulation. The geomagnetic field leads to a stretched lateral distribution of the secondaries, thus both the density of the secondaries near the shower axis and the trigger efficiency of the array decrease. This effect is larger for the showers coming from the north than that from the south, such that the trigger efficiency for the former is lower than that for the latter. The north-south asymmetry becomes more evident with larger zenith angles.