Precise measurement of the angular correlation parameter aβν in the β decay of 35Ar with LPCTrap
Precise measurement of the angular correlation parameter aβν in the β decay of 35Ar with LPCTrap
复制标题
利用 LPCTrap 精确测量 35Ar β 衰变中的角度相关参数 aβν
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Gorp
中科院分区：
文献类型：
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作者：
X. Fabian;G. Ban;R. Boussaïd;M. Breitenfeldt;C. Couratin;P. Delahaye;D. Durand;P. Finlay;X. Fléchard;B. Guillon;Y. Lemière;A. Le;E. Liénard;A. Méry;O. Naviliat‐Cuncic;E. Pierre;T. Porobić;G. Quéméner;D. Rodríguez;N. Severijns;J. Thomas;S. Gorp
通过对35 Ar核β衰变的精确测量，可以在弱扇区中寻找偏离标准模型（SM）的结果。这些测量能够检查CKM矩阵的么正性，或者约束SM的V-A理论中拒绝的外来电流的存在。为此，β -ν角相关参数α βν是从实验和模拟反冲离子飞行时间分布之间的比较中推断出来的，这些反冲离子飞行时间分布是在GANIL的LPCTrap装置的透明Paul阱中限制的35个Ar 1+离子的准纯费米跃迁之后的。在最后一次实验中，收集了1.5×106个好事件，这对应于α βν值的预期精度小于0.5%。所需的模拟分为使用大规模GPU并行化和GEANT 4工具包的源云运动学和衰变产物的跟踪。
Precise measurements in the β decay of the 35 Ar nucleus enable to search for deviations from the Standard Model (SM) in the weak sector. These measurements enable either to check the CKM matrix unitarity or to constrain the existence of exotic currents rejected in the V-A theory of the SM. For this purpose, the β -ν angular correlation parameter, a βν , is inferred from a comparison between experimental and simulated recoil ion time-of-flight distributions following the quasi-pure Fermi transition of 35 Ar1+ ions confined in the transparent Paul trap of the LPCTrap device at GANIL. During the last experiment, 1.5×106 good events have been collected, which corresponds to an expected precision of less than 0.5% on the a βν value. The required simulation is divided between the use of massive GPU parallelization and the GEANT4 toolkit for the source-cloud kinematics and the tracking of the decay products.