[en] It was assumed that there are the only two-body interactions among the nucleons. According to this assumption we derived the equation of neutron separation energy for a given nuclei, and calculated the neutron separation energies of Ge-, Sr-, and Zr- isotopes. From the results of calculations we determined the single particle energy and the pairing energy of a given shell. (Author)

[en] It was assumed that there are the only two-body interactions among the nucleons. According to this assumption we derived the equation of neutron separation energy for a given nuclei, and calculated the neutron separation energies of Ge-, Sr-, and Zr- isotopes. From the results of calculations we determined the single particle energy and the pairing energy of a given shell. (Author)

[en] Using the three-dimensional harmonic oscillator wave function (TDHOWF) we calculated the root mean squar radius of nuclei of a given mass number, 4 <= even A <= 16. Comparing the density functions of the Woods-Saxon form and that of the harmonic oscillator form, we found that they are almost identical with each other. We also found that our theoretical results are in good agreement with the experimental results for Csup(12) and Osup(16). (Author)

[en] It was assumed in this study that the jsup(n) wave function could be expanded by the fractional parentage coefficients into the jsup(2) wave function in the jj-coupling shell model and that the interaction of jsup(n) configuration could be given by V'sub(ik)=a+bqsub(ik) at the ground state. According to the assumptions the binding energies of the identical-nucleon fsup(n)sub(7/2) configuration were calculated. The results were coincident with the experimental values. (Author)

[en] Using the three-dimensional harmonic oscillator wave function (TDHOWF) we calculated the root mean square radius of nuclei of a given mass number, 4<= even A <=16. Comparing the density functions of the Woods-Saxon form and that of the harmonic oscillator form, we found that they are almost identical with each other. We also found that our theoretical results are in good agreement with the experimental results for Csup(12) and Osup(16). (Author)

[en] The neutron irradiation effects of soft magnetic properties in the as-quenched and the annealed amorphous Fe_73.5Cu₁Nb₃Si_13.5B₉ alloys were studied by complex permeability spectra measurement. The annealing at 823 K caused the decrease of permeability from irreversible domain wall motion but increase the permeability from reversible magnetization, compared to the as-quenched sample. The neutron irradiation in the as-quenched sample increases the permeability from both irreversible and reversible magnetization processes. The neutron irradiation in the annealed sample showed the increase of permeability from irreversible domain wall motion, but decrease of permeability from reversible magnetization

[en] Well depth parameter S or range correction factor S-1 is computed for several nuclear potentials such as square, Gaussian, exponential and Yukawa wells. A simple central force is assumed for nuclear potential between nucleons. We adopted only two parameters for potentials and attempted to clarify the fundamental nature of the nuclear forces that bind a proton and a neutron into a deuteron. Results thus obtained were used for an estimate of first order correction to simple square well model. (Author)

[en] Nuclear binding energies have been calculated for sup(58-59)Ni and sup(58-59)Cu isotopes in a (2Psub(3/2), 1fsub(5/2), 2psub(1/2)) shell model space. We have obtained the effective two-body matrix elements from the modified surface delta interaction(MSDI). It is rather common in MSDI calculations to assume that the radial integrals are equal at the nuclear surface. In this paper we assume that radial integrals may be different according to the configurations of particles. With the value of the oscillator constant and the nuclear radius of ⁵⁶Ni x=R/b approximatly2.4. The average deviation between 30 experimental and calculated energies is 0.146 MeV. (Author)

[en] We present the first beam test results of a real size prototype RPC for the endcap region of the CMS, one of large detectors at CERN LHC. The chamber was built with relatively low resistivity bakelite made in Korea and was operated successfully at the Gamma Irradiation Facility at CERN under the highest photon flux available, which corresponds to an effective cluster rate up to about 800 Hz/cm². The cross-talk effects between strips and sectors have been studied extensively. The high voltage plateau, which satisfies the CMS requirements for efficiency and the number of strips fired per cluster, extends to at least 300 V. The time resolution has been measured to be better than 1.3 ns in this HV plateau region. These results demonstrate that the current design of the device can be used as a muon trigger detector for the CMS forward region

[en] The first real size Resistive Plate Chamber (RPC) prototype of ME2/1 for the forward region of the Compact Muon Solenoid (CMS) detector was constructed at Korea Detector Laboratory (KODEL). The parallel resistive electrodes of the double gap RPC were made of bakelite whose resistivity was 5x10⁹ Ω cm. The prototype was tested at the Gamma Irradiation Facility (GIF) of CERN in an environment of the background intensity ranging up to 1 kHz/cm²/gap. We report that the full efficiency of 98% has been achieved with time resolution of about 1 ns. These results demonstrate that such a double gap RPC is suitable for the muon trigger in the future experiments