In this work, we seriously discuss whether X(3915) can be treated as a χ c0 (2P) state. Based on an unquenched quark model, we give the mass spectrum of the χ cJ (2P) states, where there are no free input parameters in our calculation. Our result shows that the mass gap between χ c0 (2P) and χ c2 (2P) can reach 13 MeV, which can reproduce the mass difference between Z(3930) and X(3915). Additionally, the calculated masses of χ c0 (2P) and χ c2 (2P) are consistent with experimental values of X(3915) and Z(3930), respectively. Besides, giving the mass spectrum analysis to support X(3915) as χ c0 (2P), we also calculate the width of χ c0 (2P) with the same framework, which is also consistent with the experimental data of X(3915). Thus, the possibility of charmoniumlike state X(3915) as χ c0 (2P) state is further enforced. ‡ Corresponding author * Electronic address: duanmx16@lzu.edu.cn † Electronic address: luosq15@lzu.edu.cn § Electronic address: xiangliu@lzu.edu.cn ¶ Electronic address: matsuki@tokyo-kasei.ac.jp η c (2S) 1986 h c (1P) 2003 X(3872) 2006 Z(3930) 2010 X(3915) 2013 X(3823) 2017 Y(4220) 2019 X(3842) Established charmonia XYZ states as the candidates of charmonium 17 years FIG. 1: The established charmonia and some XYZ states as possible candidates for charmonium.In 2009, focusing on 2P states, the Lanzhou group carried out the study of the mass spectrum and strong decay behav-arXiv:2002.03311v3 [hep-ph]

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Un-doped Sr3Al2OCl2 material is synthesized by conventional solid state method in reducing atmosphere. It shows intense photostimulated luminescence and the emission band of spectrum covers in 420-800 nm under infrared laser (980 nm) stimulation. Both the emission centers and traps are related to oxygen-deficient defects. Moreover, thermoluminescence indicates that there are at least five types of traps levels in this material. The weak long lasting phosphorescence (30 s) implies the lack of the shallow traps. The deep traps are rich and their storage capacity can be influenced by the releasing progress of the shallow traps. When the shallow traps are completely emptied after 6 h, the stable storage capacity of deep traps is still as large as 51.5%. Also, this material show good photostimulated luminescence under irradiation by infrared laser. Therefore, the un-doped Sr3Al2O5Cl2 material synthesized in reducing atmosphere can be considered as a potential photostimulated material for optical storage. Accordingly, the influence mechanism of traps on photostimulated luminescence is proposed.

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