Annual Reports 17

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Flooding Velocities for Countercurrent Air-Water Flow in Thin Rectangular Channels. K. Mishima and H. Nishihara  /p.1

Measurement of Average Cross Sections for Some Threshold Reactions of Ti, Cr, and Pb in the Californiurn-252 Spontaneous Fission Neutron Spectrum Field / K. Kobayashi, I. Kimura, H. Gotoh and H. Tominaga  /p.15

Measurement and Analysis of Neutron Spectrum in a Lithium Assembly / T. Mori, H. Nishihara, I. Kimura, S. A. Hayashi, K. Kobayashi, S. Yamamoto and M. Nakagawa  /p.22

Neutron Diffraction Study on Magnetization Process in Tilted Helix, Tb0.5 Er0.5 Alloy / N. Achiwa, S. Kawano and Y. Matsumoto  /p.34

Neutron Diffraction Study of High Temperature Phase of K2SeO4 / Y. Iwata, N. Koyano, I. Shibuya, M. Hidaka and A. Okazaki  /p.43

Single Strand Breaks in DNA of Ehrlich Ascites Tumour Cells Irradiated by Thermal Neutrons, and Effect of Bleomycin on the Repair Kinetics / H. Maki, K. Kawai, Y. Honda and M. Akaboshi  /p.54

Reviews

Methods for Determining Flow Regimes in Gas-Liquid Two-Phase Flow / K. Mishima and H. Nishihara  /p.61

Ultracold Neutrons and Their Application to Studies on Condensed Matters and Elementary Particles / M. Utsuro and H. Yoshiki  /p.94

Short Notes

Determination of the Pn Value of 95Rb by a β₋γ Spectroscopic Method / K. Okano, Y. Kawase and Y. Funakoshi  /p.110

Dose-Rate Effect on the 3H-β-Induces Alanine Radical Formation at -196°C / M. Akaboshi, K. Kawai and H. Maki  /p.115

Effect of Uranium-235 Enrichment on Initial Reactivity of Molten Salt Reactor.. I. Kano and K. Kanda  /p.119

Preliminary Notes

Half-Lives of Levels in 141Ba. / T. Ishii, M. Yoshida, H. Yamamoto, K. Kawade, T. Katoh, J. Ruan, K. Okano and Y. Kawase  /p.122

G amma-Gamma Angular Correlation Measurements in 151Pr / H. Iimura, T. Seo and S. Yamada  /p.127

Response Functions of an HPGe Detector to Electrons / T. Ishii, H. Yamamoto, M. Yoshida, K. Kawade, H. Miyade, Y. Iwata, T. Katoh, J. Ruan, Y. Funakoshi, Y. Kawase and K. Okano  /p.132

Vacancy Migration and Void Swelling in a Stainless Steel / E. Kuramoto, N. Tsukuda, Y. Aono, M. Takenaka, K. Kitajima and H. Yoshida  /p.137

Direct Observation of Cascade Damages in FCC Metals Induced by Irradiations with Heavy Ions and Fast Neutrons… H. Yoshida, Y. Hayashi, T. Maeda and M. Kiritani  /p.141

In-plane Electrical Conduction in N,N’-Disubstituted Dithiooxamidatocopper (Ⅱ) Langmuir-Blodgett Films / K. Sasakawa and S. Iwata  /p.146

Ion Chromatographic Separation of Chemical Species of Bromine Formed by (n, γ) Reaction / T. Tamai, S. Nishikawa, Y. Tanaka and H. Takemi  /p.150

Topological Alteration of DNA in Tritiated Water / T. Ikushima  /p.155

Technical Papers

A Simple Mössbauer Spectrometer Using a Microcomputer / M. Mizora, S. Uehara and Y. Maeda  /p.158

Abstracts  /p.165