[en] Results from the AMY experiment at the TRISTAN e⁺e^- collider are presented using a data sample of about 28 pb^-1 at center of mass energies between 50 and 60.8 GeV. The measured value of R, which is about 2σ higher than the standard model expectation for c.m. energy above 56 GeV, is presented and several possible explanations are discussed. The results of the forward-backward asymmetry measurement of e⁺e^- → bb-bar events, tests of QCD in the hadronic jets, and the search of heavy leptons are also presented. (author)

[en] The MC 50 cyclotron facility at KIRAMS (Korea Institute of Radiological and Medical Science) will be used to generate the radioisotopes of interest. Excitation functions for the proton-induced reactions of ^natFe, ^natNb and ^natHf, and for the alpha-induced reactions of natFe, natY and natW will be measured up to an incident beam energy of 40 MeV by means of the tacked-foil activation technique combined with high resolution γ-ray spectroscopy.

[en] The excitation functions of "6"6","6"7","6"8Ga, "6"2","6"3","6"5Zn, "6"1","6"4Cu, and "5"8","6"0Co radionuclides in the "n"a"tCu(α, x) reaction were measured in the energy range from 15 to 42 MeV by using a stacked-foil activation method at the MC-50 cyclotron of the Korean Institute of Radiological and Medical Sciences. The measured results were compared with the literature data as well as the theoretical values obtained from the TENDL-2013 and TENDL-2014 libraries based on the TALYS-1.6 code. The integral yields for thick targets of the produced radionuclides were also determined from the measured excitation functions and the stopping power of natural copper

[en] We present a study on searches for extra dimensions and compositeness using dijets in the CMS detector. Estimates are presented for both the QCD background and signals of new physics beyond the standard model with a focus on the integrated luminosities 10 pb^-1, 100 pb^-1, and 1 fb^-1 expected early in LHC experiment. The inclusive cross section as a function of jet p_T is a first simple measure of QCD dijets which is sensitive to a 3 TeV contact interaction with only 10 pb^-1. With the dijet mass distribution we expect to be able to convincingly observe dijet resonance with large cross sections, such as a 2 TeV excited quark which produces many σ signals with 100 pb^-1. With the dijet ratio, a simple angular measurement, we expect to be able to discover a contact interaction scale Λ+ of 4, 7, and 10 TeV for integrated luminosities of 10 pb^-1, 100 pb^-1, and 1 fb^-1, respectively. With 100 pb^-1 a 2 TeV resonance with the production rate of an excited quark produces a convincing signal in the dijet ratio.

[en] The neutron total cross section of natural Ag and Sm has been measured in the energy region from 0.1 eV to 100 eV by the neutron time-of-flight method at Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and an 11 m long time-of-flight path. A ⁶Li-ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.6 cm has been used as a neutron detector and metallic plates of Ag and Sm samples have been used for the neutron transmission measurement. The background level has been determined by using notch-filters of Co, In, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and that from neutron capture, we have employed a neutron-gamma separation system based on their different pulse shapes. The present measurements are in general agreement with the previous ones and the evaluated data in ENDF/B-VI. The resonance parameters of Ag isotopes (¹⁰⁷Ag and ¹⁰⁹Ag) have been extracted from the transmission data by using the SAMMY code. (author)

[en] The neutron total cross sections of polyethylene and Cu have been measured using the 100-MeV electron linear accelerator in order to study the possibility to produce nuclear data at the Pohang Neutron Facility. The neutron transmission measurement was made by the neutron time-of-flight method. The present results are in good agreement with the evaluated data in ENDF/B-VI within their uncertainties at all energy regions. From this study, it is to be noted here that the our neutron facility is suited for nuclear data production, and that the facility can be provided as a user facility for a study of neutron interaction with nuclei

[en] We report the activities of the Pohang Neutron Facility which consists of an electron linear accelerator, a water-cooled Ta target, and a 12-m time-of-flight path. It has been equipped with a four-position sample changer controlled remotely by a CAMAC data acquisition system, which allows simultaneous accumulation of the neutron time of flight spectra from 4 different detectors. It can be possible to measure the neutron total cross-sections in the neutron energy range from 0.1 eV to few hundreds eV by using the neutron time-of-flight method. A ⁶LiZnS(Ag) glass scintillator was used as a neutron detector. The neutron flight path from the water-cooled Ta target to the neutron detector was 12.1 m. The background level was determined by using notch-filters of Co, In, Ta, and Cd sheets. In order to reduce the gamma rays from bremsstrahlung and those from neutron capture, we employed a neutron-gamma separation system based on their different pulse shapes. The present measurements of several samples (Ta, Mo) are in general agreement with the evaluated data in ENDF/B-VI. We measured the thermal neutron capture cross-sections and the resonance integrals of the ¹⁸⁶W(n,γ)¹⁸⁷W reaction and the ⁹⁸Mo(n,γ)⁹⁹Mo reaction by the activation method using the ¹⁹⁷Au(n,γ)¹⁹⁸Au monitor reaction as a single comparator. We also report the isomeric yield ratios for the 44 m, gSc isomeric pairs produced from four different photonuclear reactions ⁴⁵Sc(γ,n)^44m,gSc, ^natTi(γ,xn1p)^44m,gSc, ^natFe(γ,xn5p)^52m,gMn, and ¹⁰³Rh(γ,4n)^99m,gRh by using the activation method.

[en] We report the activities for nuclear data measurements using charged particle-, neutron-, and photon-induced reactions in Korea. Charged particle-induced reaction cross-sections are determined by using the stacked-foil activation technique at the MC-50 cyclotron facility in the Korean Institute of Radiological and Medical Science. Neutron-induced nuclear data were measured by using the pulsed neutron facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a 12 m time-of-flight path. It can be possible to measure the neutron total cross-sections in the neutron energy range from 0.01 eV to few hundreds eV by using the neutron time-of-flight method and also measured the photo-neutron cross-sections by using the Bremsstrahlung from the electron linac. We collaborated with foreign researchers in India, Japan, Russia, China, and Vietnam. We also utilized foreign facilities in India, Japan, Russia, and USA. (author)

[en] The Pohang Neutron Facility consists of an electron linear accelerator, a water-cooled Ta target, and an 11-m time-of-flight path which has been constructed for nuclear data production. It has been equipped with a new four-position sample changer controlled remotely by a CAMAC data acquisition system, which allows simultaneous accumulation of the neutron time of flight spectra from 4 different detectors. The neutron total cross-sections of natural Dy, In and Cu were measured in the neutron energy range from 0.1 eV to 100 eV by using the neutron time of flight method with the new data acquisition system. A ⁶LiZnS(Ag) glass scintillator was used as a neutron detector and metallic plates of natural Dy, In and Cu samples were used for the neutron transmission measurement. The neutron flight path from the water-cooled Ta target to the neutron detector was 10.81±0.02 m. The background level was determined by using notch-filters of Co, Ta, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and those from neutron capture, we employed a neutron-gamma separation system based on their different pulse shapes. The present measurements are in general agreement with the evaluated data in ENDF/B-VI. The resonance parameters of the Dy and In isotopes were extracted from the transmission data and compared with the previous ones. (author)

[en] The Pohang Neutron Facility based on an electron linac was operated for total neutron crosssection measurements by using the pulsed neutrons produced in a water-cooled Ta-target with a water moderator. We investigated the photo-neutrons produced in the water-cooled Ta-target system by using the Monte-Carlo simulation code MCNPX, version 2.5e, and the results were checked with the experimental values. The optimum conditions of the target system and the experimental setup to maximize the thermal neutron production were investigated.