There has recently been a dramatic renewal of interest in hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like XYZ states at BESIII and B factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X(1835) meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII during the remaining operation period of BEPCII. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCII to higher luminosity.
A new hybrid experiment has been constructed to measure the chemical composition of cosmic rays around the "knee" in the wide energy range by the Tibet ASγ collaboration at Tibet, China, since 2014. They consist of a high-energy air-shower-core array (YAC-II), a high-density air-shower array (Tibet-III) and a large underground water-Cherenkov muon-detector array (MD). In order to obtain the primary proton, helium and iron spectra and their "knee" positions in the energy range lower than 10 16 eV, each of PMTs equipped to the MD cell is required to measure the number of photons capable of covering a wide dynamic range of 100 -10 6 photoelectrons (PEs) according to Monte Carlo simulations. In this paper, we firstly compare the characteristic features between R5912-PMT made by Japan Hamamatsu and CR365-PMT made by Beijing Hamamatsu. This is the first comparison between R5912-PMT and CR365-PMT. If there exists no serious difference, we will then add two 8-inch-in-diameter PMTs to meet our requirements in each MD cell, which are responsible for the range of 100 -10000 PEs * Corresponded author Email: yingzhang@ihep.ac.cn and 2000 -1000000 PEs, respectively. That is, MD cell is expected to be able to measure the number of muons over 6 orders of magnitude.
Neutrino physics, Low-background physics, Underground physics, Neutrinoless double-beta decay, Neutrino mass, Ultra-high energy cosmic rays Highlights Highlights are optional yet highly encouraged for this journal, as they increase the discoverability of your article via search engines. They consist of a short collection of bullet points that capture the novel results of your research as well as new methods that were used during the study (if any). Please have a look at the examples here: example Highlights. Highlights should be submitted in a separate editable file in the online submission system. Please use 'Highlights' in the file name and include 3 to 5 bullet points (maximum 85 characters, including spaces, per bullet point).
A: The Water Cherenkov Detector Array (WCDA) for the Large High Altitude Air Shower Observatory (LHAASO) will employ 3000 large-sized hemisphere photomultiplier tubes (PMTs) to collect the Cherenkov light produced by shower particles crossing water. The PMTs require not only good single photoelectron (SPE) resolution and small transit time spread (TTS), but also good linearity up to 4000 photoelectrons. XP1805 PMT produced by Hainan Zhanchuang Photonics Technology Co., Ltd (HZC), China, with a production line imported from Photonis (France) is a good candidate for LHAASO-WCDA readout. In this paper, the design of a high dynamic range base for XP1805 is presented. The SPE responses and non-linearity of XP1805 with the high dynamic range base are measured. These results show that HZC XP1805 with the designed base is well qualified for LHAASO-WCDA, with peak-to-valley ratio greater than 2, TTS around 3 ns, dynamic range (non-linearity within 5%) over 1500 and 5300 photoelectrons for anode and the 6th dynode output, respectively, at PMT gain of 3×10 6 with the inciting light pulse width of 6.4 ns. K: Photon detectors for UV, visible and IR photons (vacuum); Large detector systems for particle and astroparticle physics; Cherenkov detectors 1Corresponding author.
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