Abstract
The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the test were the characterization of the target, the hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope and X-rays detectors made with high purity Germanium and Lanthanum Bromide crystals. In this paper the experimental setup is described and the results of the detector characterization are presented.
Highlights
Oxygen β + Kγ Kδ Kα (O) 5.2 Time spectraThe study of the time distribution of the detected signals permits to determine the lifetime of the muonic atoms and the transfer rate of muons from the μp to other elements once the delayed X-ray muonic transition lines can be selected
The purity of the target was confirmed by the X-ray spectrum measured by the high purity Germanium detectors (HPGe)
In the energy spectrum recorded by the GLP HPGe detector, same figure top panel, only the aluminium lines together with the argon Lα peak are present, confirming the purity of the gas mixture
Summary
Muons from the beam line enter and stop in the gas creating excited muonic atoms. The target is made of an aluminium cylindrical vessel filled with high pressure gas. [10], is built using the Aluminum alloy Al6061 It is a cylinder of 125 mm of base diameter and 260 mm length, with an inner volume of 2.8 l. The thickness of the walls is 7 mm, except for a circular entrance window of 44 mm diameter thinned to 4 mm. This shape and dimensions ensure a perfect and certified resistance to gas pressure of several tenth of bar and minimize the divergence of the muon beam due to multiple scattering. The filling procedure was performed by first evacuating the gas target to a partial pressure of 10−6 bar and filling it with the chosen high purity gas
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