FAMU:能量依赖转移速率的研究 $\Lambda_{\mu p \rightarrow \mu O}$

F. C. E. Mocchiutti, V. Bonvicini, M. Danailov, E. Furlanetto, K. S. Gadedjisso-Tossou, D. Guffanti, C. Pizzolotto, A. Rachevski, L. Stoychev, E. Vallazza, G. Zampa, J. Niemela, K. Ishida, A. Adamczak, G. Baccolo, R. Benocci, R. Bertoni, M. Bonesini, F. Chignoli, M. Clemenza, A. Curioni, V. Maggi, R. Mazza, M. Moretti, M. Nastasi, E. Previtali, Dinyo Bakalov, P. Danev, M. Stoilov, G. Baldazzi, R. Campana, I. D'Antone, M. Furini, F. Fuschino, C. Labanti, A. Margotti, S. Meneghini, G. Morgante, L. Rignanese, P. L. Rossi, M. Zuffa, T. Cervi, A. Bari, A. Menegolli, C. Vecchi, R. Nardo, M. Rossella, A. Tomaselli, L. Colace, M. Vincenzi, A. Iaciofano, F. Somma, L. Tortora, R. Ramponi, A. G. M. I. O. Physics, Sezione di Trieste, 2. viaA.Valerio, 34127 Trieste, Italy., Elettra-Sincrotrone Trieste S.C.p.A., SS14, Km 163.5, 34149 Basovizza, Trieste, Mathematics, I. Department, Udine University, via delle Scienze 206, Udine, The Abdus Salam International Centre for Theoretical Physics, 11 StradaCostiera, Laboratoire
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引用次数: 2

摘要

FAMU实验的主要目标是测量介子氢在1S态下的超精细分裂(hfs) $\Delta E_{hfs}(\mu^-p)1S$。这个实验背后的物理过程如下:$\mu p$是在氢和高z气体的混合物中形成的。当以共振能量$\Delta E_{hfs}\approx0.182$ eV吸收光子时,在随后与周围$H_2$分子的碰撞中,$\mu p$被激发能量的$\sim2/3$迅速去激发和加速。可观察到的是由μ子转移$(\mu p) +Z \rightarrow (\mu Z)^*+p$形成的$\mu Z$发射的k线x射线的时间分布,该反应的速率取决于$\mu p$动能。$(\mu Z)^*$级联k线x射线的时间分布对调谐激光波长的最大响应表明存在共振。在FAMU实验的准备阶段,已经进行了几次测量,以验证方法并为光谱测量准备最佳的目标和探测器配置。我们在这里提出了从介子氢到氧的转移速率的能量依赖的关键研究($\Lambda_{\mu p \rightarrow \mu O}$),这是第一次精确测量。
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FAMU: study of the energy dependent transfer rate $\Lambda_{\mu p \rightarrow \mu O}$
The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $\Delta E_{hfs}(\mu^-p)1S$. The physical process behind this experiment is the following: $\mu p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $\Delta E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $\mu p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $\mu Z$ formed by muon transfer $(\mu p) +Z \rightarrow (\mu Z)^*+p$, a reaction whose rate depends on the $\mu p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(\mu Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($\Lambda_{\mu p \rightarrow \mu O}$), precisely measured for the first time.
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