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Lim, Kwang Soo,Lee, Woo Ram,Lee, Han Geul,Kang, Dong Won,Song, Jeong Hwa,Hilgar, Jeremy,Rinehart, Jeffrey D.,Moon, Dohyun,Hong, Chang Seop ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol. No.
<P>Three MOF-74-type Co(II) frameworks with one-dimensional hexagonal channels have been prepared. Co(II) spins in a chain are ferromagnetically coupled through carboxylate and phenoxide bridges. Interchairi antiferromagnetic couplings via aromatic ring pathways operate over a Co-Co length Shorter than similar to 10.9 angstrom, resulting in, a field-induced metamagnetic transition, while being absent over lengths longer than similar to 14.7 angstrom.</P>
Aging Study with High-Level Radiation Sources for the CMS Forward RPCs
김현철,이경세,Byun Il Kim,홍병식,Chong Kim,D. H. Moon,Duk Gil Koo,E. Won,J. K. Lim,Ji Hyun Kim,Jun Tak Rhee,K. B. Lee,Kwang-Souk Sim,M. S. Ryu,Rong Jiang Hu,S. K. Nam,Sang Yeol Bahk,이석재,Seong Jong Hong,Sung Hw 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
An aging study with intensive radiation sources was performed for the forward resistive plate chambers (RPCs) of the Compact Muon Solenoid (CMS) detector in the Large Hadron Collider experiment (LHC). The expected rate of the radiation background to be induced in the forward RPCs ranges from a few tens of Hz/㎠ to as much as ~1 kHz/㎠. Therefore, the radiation hardness for the forward RPCs should be sufficient to ensure the safe operation of the CMS and successful achievement of the LHC physics. Two oil-coated and one plain double-gap RPCs were manufactured and tested with the neutron beam provided by the MC50 cyclotron of the Korea Institute of Radiological and Medical Science (KIRAMS) and with gamma rays from a 200-mCi137Cs source. The estimated radiation dose induced by the fast neutrons was approximately 50 Gy. No significant aging effect was found to be a consequence of the neutron irradiation, However, a degradation of the RPC performance was observed after intense gamma irradiation for a total of 32.5 days. The mean gamma-signal rate drawn in each RPC was 4.0 kHz/㎠, which was approximately two times the maximum rate expected in the highest η-region covering the particle trigger. Increases in the noise rates and the currents accounted for the degradation in the efficiencies for the RPCs. As a result, safe operation of the forward RPCs in the avalanche mode was ensured for signal rates up to 2 kHz/㎠.