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In Eun Jin,Min Kyung Joo,Bak Sang-In,Kim Do Yoon,함철민,Shim Chungbo,Zhou Yujie,Hong Seung-Woo,Park Tae-Sun,Shin Jae Won,Bhoraskar V. N. 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.9
The cross sections of 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi reactions at a neutron energy of 30 MeV are measured by making use of neutron beams of continuous energy spectra and a subtraction method. By impinging proton beams of 30 and 35 MeV to a thick beryllium target, neutron beams of continuous and broad energy spectra are produced and are guided to Y and Bi sample targets. The difference between the two neutron spectra generated by two neighboring proton energies is found to be peaked in a narrow energy range and thus can be regarded as quasi-monoenergetic, which can be used to extract (n,xn) cross sections. The uncertainty in the neutron fluence is reduced by analyzing the activities of aluminum and niobium reference samples placed on top of the Y and Bi samples. The use of a subtraction method by employing neutron beams of continuous energy spectra gives us the 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi cross sections in fair agreement with the existing experimental data and nuclear data libraries.
Patole, S.P.,Kim, H.I.,Jung, J.H.,Patole, A.S.,Kim, H.J.,Han, I.T.,Bhoraskar, V.N.,Yoo, J.B. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.11
Aligned carbon nanotubes (CNTs) were grown on an aluminum foil laminated on a flexible stainless steel (SS) substrate. Lamination was carried out under a pressure of 10MPa with simultaneously heating at 400<SUP>o</SUP>C. The laminated Al foil was spray-coated with an iron chloride catalyst precursor solution and the CNTs were grown using water-assisted chemical vapor deposition at 810<SUP>o</SUP>C. The CNTs grew as vertically aligned forests, approximately 600μm in height, within 600s without crumpling of the Al foil. The Al foil acts as a sacrificial barrier layer to grow the CNTs. The CNTs had 2-30 walls with an inner diameter of 3-8nm. Thermogravimetric and field emission analysis of the CNTs revealed a degradation temperature and turn-on field of 643.5<SUP>o</SUP>C and 0.46V/μm, respectively. Transmission electron microscopy and X-ray photoelectron spectroscopy were used to analyze the Al-SS interface and chemical states. After removing the CNTs, the flexible SS substrate could be cleaned, recoated with Al and reused for CNT growth. Overall, this process is a repeatable and continuous roll-to-roll processable method that can be scaled up for industrial production.