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| 1 | Luminescence properties of Gd2Si2O7:Ce and Gd2Si2O7:La,Ce under vacuum ultraviolet irradiation显示文摘The luminescence properties of Ce- or Ce and La-doped gadolinium pyrosilicate(Gd_2Si_2O_7, GPS) were characterized using vacuum ultraviolet(VUV) excitation light. A prominent emission band was observed in the luminescence spectra with excitation at 60 nm and ascribed to 5d-4f transition of Ce^(3+). Because the excitation wavelength of 60 nm corresponded to the excitation in the host matrix, this result indicated that the excitation energy transfer occurred from the host matrix to Ce^(3+) ions. On the basis of the rise in the luminescence time profiles with excitation at 60 nm, the energy transfer occurred within 2 ns, which was much shorter than that of Ce-doped Gd_2SiO_5. For Ce-doped GPS, the decay rate was slower for the host excitation than that for direct excitation of Ce^(3+). In contrast, for Ce and La-doped GPS, no significant difference was observed for the host excitation and direct excitation of Ce^(3+). This result indicated that the energy transfer from the host to Ce^(3+) ions led to a different radiative decay process, and that La doping had an effect on the energy transfer and decay process. | M.Koshimizu T.Yanagida Y.Fujimoto K.Asai | 2016 | Journal of Rare Earths2016，34，8： | 1 |
| 2 | Electroweak Axion in Light of GRB221009A显示文摘Very high energy(VHE)photons may have a higher survival rate than that expected in standard-model physics,as suggested by the recently reported gamma ray burst GRB221009A.While a photon-axion like particle(ALP)oscillation can boost the survival rate of the VHE photons,current works have not been based on concrete particle models,leaving the identity of the corresponding ALP unclear.Here,we show that the required ALP scenario is consistent with the electroweak axion with an anomaly free Z_(10)Froggatt–Nielsen symmetry. | Weikang Lin Tsutomu T.Yanagida | 2023 | Chinese Physics Letters2023，40，6： | 0 |
| 3 | 大阪精炼厂铜阳极泥的处理显示文摘1970年,日本三菱金属公司大阪精炼厂迠立了一个新的贵金属回收车间。该车间已生产了四年,主要处理直岛冶炼厂和精炼厂的阳极泥,同时也处理小名浜熔炼与糙炼厂的阳极泥。这些阳极泥的特征是硫酸铅的含量高,造成贵金属特别是银的极为频繁的循环。因此,利用浮选法从阳极泥中分离硫酸铅方面作了不少努力。试验室和半工业试验经验指出,用浮选法可有效地将硫酸铅排入尾砂中,使大部分阳极泥均可有效地还原。此外,还发现金银含量丰(宀夫)的精矿极易用回转窑处理,这就排除了常规方法的某些步骤。 | T.Yanagida 肖林 | 1980 | 中国有色冶金1980，0，7： | 0 |
| 4 | Development of novel rare earth doped fluoride and oxide scintillators for two-dimensional imaging显示文摘Two topics were focused.The first one was about the gamma-ray scintillator,Pr3+:Lu3Al5O12(LuAG) .The second one was about neutron scintillator,Ce3+:6LiCaAlF6 and Eu2+:6LiCaAlF6(6LiCAF) .Those scintillators have been developed very recently for modern imaging appli-cations in the medical and homeland security fields.In both cases,the rare earth ions are playing the crucial role as emission centers.Pr3+ in LuAG provided fast 5d→4f transition providing noticeably shorter decay time than that of Ce3+.Among several candidate hosts,LuAG showed the best performance.Bulk crystal growth,basic scintillation properties,two-dimensional gamma-ray imaging and positron emission mammography(PEM) application were demonstrated.Due to the international situation,the homeland security was compromized by illicit traffic of explosives,drugs,nuclear materials,etc.and the ways to its improvement became an important R&D topic.For this purpose the Ce and Eu doped LiCAF ap-peared competitive candidates.Especially,when substitution of 3He neutron detectors was considered,the discrimination ability of gamma-ray from alpha-ray was important.Bulk crystal growth,basic scintillation properties and two-dimensional neutron imaging were demonstrated. | A.Yoshikawa T.Yanagida Y.Yokota K.Kamada N.Kawaguchi K.Fukuda A.Yamazaki K.Watanabe A.Uritani T.Iguchi G.Boulon M.Nikl | 2011 | Journal of Rare Earths2011，29，12： | 0 |
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