Paramagnetic,ferromagnetic and antiferromagnetic properties are reported for as-quenched amorphous,annealed quasicrystal and crystal Al-Fe-Ce alloys.The first ferromagnetic quasicrystal was studied.Its Curie temperatu...Paramagnetic,ferromagnetic and antiferromagnetic properties are reported for as-quenched amorphous,annealed quasicrystal and crystal Al-Fe-Ce alloys.The first ferromagnetic quasicrystal was studied.Its Curie temperature is about 340K andμ(Fe)=2.3μB.展开更多
This year we continued to study experiments that can be performed using neutrinos produced via Decay At Rest(DAR)at spallation sources.In 2017 the COHERENT collaboration was able to measure for the first time Coherent...This year we continued to study experiments that can be performed using neutrinos produced via Decay At Rest(DAR)at spallation sources.In 2017 the COHERENT collaboration was able to measure for the first time Coherent Elastic Neutrino Nucleus Scattering(CENNS)[1]:neutrinos are produced at the Spallation Neutruon Source(SNS)via Pion Decay At Rest(πDAR).The study on CENNS brings us to a new precision era:first of all,any deviation from the Standard Model prediction can be a sign of new physics;moreover,neutrino-nucleus interactions are crucial in the understating of core collapse supernovae,and information on the CENNS cross section can be useful for the next generation dark matter detectors,since they are rapidly approaching to the intrinsic neutrino background floor.展开更多
White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials.By using two orthogonal polarizers,a self-induced birefringence of continuum is observed when focusi...White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials.By using two orthogonal polarizers,a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused silica.That is,the generated white-light continuum is synchronously modulated anisotropically while propagating in fused silica.Time-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time evolution.By adjusting laser energy,the transmitted intensity of continuum modulated by self-induced birefringence also varies correspondingly.Morphology analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica,and the anisotropic structures at the same time modulate the generated continuum.展开更多
基金The project supported by National Natural Science Fonndation of China and CAS Beijing EM Laboratary.
文摘Paramagnetic,ferromagnetic and antiferromagnetic properties are reported for as-quenched amorphous,annealed quasicrystal and crystal Al-Fe-Ce alloys.The first ferromagnetic quasicrystal was studied.Its Curie temperature is about 340K andμ(Fe)=2.3μB.
基金Chinese Academy of Sciences Presidents International Fellowship Initiative(2015PM063)National Natural Science Foundation of China(11375201)CAS Key Research Program of Frontier Sciences(QYZDY-SSW-SLH006)。
文摘This year we continued to study experiments that can be performed using neutrinos produced via Decay At Rest(DAR)at spallation sources.In 2017 the COHERENT collaboration was able to measure for the first time Coherent Elastic Neutrino Nucleus Scattering(CENNS)[1]:neutrinos are produced at the Spallation Neutruon Source(SNS)via Pion Decay At Rest(πDAR).The study on CENNS brings us to a new precision era:first of all,any deviation from the Standard Model prediction can be a sign of new physics;moreover,neutrino-nucleus interactions are crucial in the understating of core collapse supernovae,and information on the CENNS cross section can be useful for the next generation dark matter detectors,since they are rapidly approaching to the intrinsic neutrino background floor.
基金This research was supported by the National Key Research and Development Program of China(No.2016YFB1102402)the National Natural Science Foundation of China(No.61675214).
文摘White-light continuum can be induced by the interaction of intense femtosecond laser pulses with condensed materials.By using two orthogonal polarizers,a self-induced birefringence of continuum is observed when focusing femtosecond laser pulses into bulk fused silica.That is,the generated white-light continuum is synchronously modulated anisotropically while propagating in fused silica.Time-resolved detection confirms that self-induced birefringence of continuum shows a growth and saturation feature with time evolution.By adjusting laser energy,the transmitted intensity of continuum modulated by self-induced birefringence also varies correspondingly.Morphology analysis with time evolution indicates that it is the focused femtosecond laser pulses that induce anisotropic microstructures in bulk fused silica,and the anisotropic structures at the same time modulate the generated continuum.
