http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ultrasonic Investigation of the Jahn-Teller Effect in ZnSe and ZnTe Crystals Doped with 3d Ions
Vladimir GUDKOV,Alexander LONCHAKOV,Irina ZHEVSTOVSKIKH,Viktor SOKOLOV 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
The temperature dependences of the elastic moluli and the absorption of ultrasound were in- vestigated in ZnSe:Mn2+, ZnSe:V2+ and ZnTe:Ni2+ crystals. Peak of absorption and softening of the elastic modulus C4 were found at low temperatures in crystals with the 3d impurities that had orbitaly degenerate states. The observed anomalies were interpreted as a manifestation the Jahn-Telereectinanultrasonicexperiment. Thetemperaturedependencesoftherelaxationtime werereconstructed. Thepotentialbarierswereestimated: V0=5:6cm (ZnSe:V2+)and21cm-1(ZnTe:Ni2+). Softening of the modulus C44 evidenced that the local distortions were of a trigonal type. Neither anomalies in the ultrasound absorption nor those in the elastic moduli were observed in ZnSe:Mn2+, a crystal with a singlet orbital ground state of the 3d impurity.
Screening of nucleon electric dipole moments in nuclei
Inoue, Satoru,Gudkov, Vladimir,Schindler, Matthias R.,Song, Young-Ho American Physical Society 2016 Physical Review C Vol.93 No.5
<P>A partial screening of nucleon electric dipole moments (EDMs) in nuclear systems, which is related to the Schiff mechanism known for neutral atomic systems, is discussed. It is shown that the direct contribution from the neutron EDM to the deuteron EDM is partially screened by about 1% in a zero-range approximation calculation.</P>
Time reversal invariance violating and parity conserving effects in proton-deuteron scattering
Song, Young-Ho,Lazauskas, Rimantas,Gudkov, Vladimir American Physical Society 2016 Physical Review C Vol.93 No.6
<P>Time reversal invariance violating parity conserving (TVPC) effects are calculated for elastic proton-deuteron scattering with proton energies up to 2 MeV. The distorted-wave Born approximation is employed to estimate TVPC matrix elements, based on hadronic wave functions, obtained by solving three-body Faddeev-Merkuriev equations in configuration space with realistic potentials.</P>
Beam characterization at the KAERI UED beamline
Setiniyaz, S.,Kim, H. W.,Baek, I. H.,Nam, J.,Chae, M.,Han, B. H.,Gudkov, B.,Jang, K. H.,Park, S.,Jeong, Y. U. 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>The UED (ultrafast electron diffraction) beamline of the KAERI's (the Korea Atomic Energy Research Institute's) WCI (World Class Institute) Center has been successfully commissioned. We have measured the beam emittance by using the quadrupole scan technique and the charge by using a novel measurement system we have developed. In the quadrupole scan, a larger drift distance between the quadrupole and the screen is preferred because it gives a better thin-lens approximation. A high bunch-charge beam, however, will undergo emittance growth in the long drift caused by the space-charge force. We present a method that mitigates this growth by introducing a quadrupole scan with a short drift and without using the thin-lens approximation. The quadrupole in this method is treated as a thick lens, and the emittance is extracted by using the thick-lens equations. Apart from being precise, our method can be readily applied without making any change to the beamline and has no need for a big drift space. For charge measurement, we have developed a system consisting of an in-air Faraday cup (FC) and a preamplifier. Tests performed utilizing 3.3-MeV electrons show that the system was able to measure bunches with pulse durations of tens of femtoseconds at 10 fC sensitivity.</P>
Beam Characterization at the KAERI UED Beamline
Sadiq Setiniyaz,Hyun Woo Kim,In-Hyung Baek,Jinhee Nam,MoonSik Chae,Byung-Heon Han,Boris Gudkov,Kyu Ha Jang,Sunjeong Park,Sergey Miginsky,Nikolay Vinokurov,Young Uk Jeong 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
The UED (ultrafast electron diffraction) beamline of the KAERI’s (the Korea Atomic Energy Research Institute’s) WCI (World Class Institute) Center has been successfully commissioned. We have measured the beam emittance by using the quadrupole scan technique and the charge by using a novel measurement system we have developed. In the quadrupole scan, a larger drift distance between the quadrupole and the screen is preferred because it gives a better thin-lens approximation. A high bunch-charge beam, however, will undergo emittance growth in the long drift caused by the space-charge force. We present a method that mitigates this growth by introducing a quadrupole scan with a short drift and without using the thin-lens approximation. The quadrupole in this method is treated as a thick lens, and the emittance is extracted by using the thick-lens equations. Apart from being precise, our method can be readily applied without making any change to the beamline and has no need for a big drift space. For charge measurement, we have developed a system consisting of an in-air Faraday cup (FC) and a preamplifier. Tests performed utilizing 3.3- MeV electrons show that the system was able to measure bunches with pulse durations of tens of femtoseconds at 10 fC sensitivity.