Radiochemical Study of Nuclear Spallation and Fission at Intermediate Energies

坂本、藤原和柴田等人利用日本现有加速器上的光子、中子、质子和重离子，在低能到高能范围内对核反应的各个方面，如溅射、裂变和碎裂进行了放射化学研究，并讨论了反应机理及其可能的应用<27><201>。还包括Cu-裂变和Au-裂变的反冲测量。Masumoto和Ohtsuki在东北大学电子直线加速器的250 cm混凝土屏蔽中测量了溅射产物的深度和角度分布。该加速器曾被坂本研究组和三头研究所使用，他们报道了在高通量反应堆JMTR中^ Np的光裂变<237>以及^<242>Cm和^<238>Pu的产生。他阿尔 关于我们 因此研究了利用（n，g）和（g，n）反应进行标记化合物的反冲合成。Shinohara对GeV能量的重离子诱发裂变进行了广泛的研究，他还在KEK PS继续了对π介子原子化学的重要研究。核过程中的动量转移是一个非常重要的信息，Shinohara在重离子诱发反应中进行了研究，Kudo也在质子诱发^<238>U和^<232>Th裂变中进行了研究。中子和质子诱导反应产生几十MeV的轻核，如^&lt;7，10&gt;Be，在许多应用中至关重要，Imamura和柴田报道了激发函数的几个结果。小林、永井和今村建立了一种对长寿命放射性核素的极其灵敏的测量方法，并成功地应用于上述一些反应研究。通过交流在本项目过程中获得的信息进行了联合讨论，并探讨了我们在这一领域进一步发展的前景。少

Radiochemical studies of various aspects of nuclear reactions such as spallation, fission and fragmentation have been performed at low to high energies by using photons, neutrons, protons, and heavy ions from available accelerators in Japan, and discussed together for reaction mechanism and their possible applications.Photopion reactions photospallation, photofission and photofragmentation of 22 targets ranging from ^<27>Al to ^<201>Bi at 60-1000 MeV were extensively studied by Sakamoto, Fujiwara and Shibata. Recoil measurements of Cu-spallation and Au-fission were included. Masumoto and Ohtsuki measured the depth and angular profiles of spallation products in a 250 cm concrete shields for Tohoku Univ.e-linac. This accelerator was used by Sakamoto group and Mitsugashira who reported studies of photofission of ^<237>Np and production of ^<242>Cm and ^<238>Pu in a high-flux reactor JMTR.Recoil range measurement was performed by Sekine, in which a new thin foil method was developed. He al … More so studied recoil synthesis of labelled compounds by (n, g) and (g, n) reactions. Heavy ion-induced spallation upto GeV energies was extensivly studied by Shinohara who also continued an important study of pi-mesic atom chemistry at KEK PS.Momentum transfer in nuclear processes is a very important information, and investigated in heavy-ion-induced reactions by Shinohara and also in proton-induced fission of^<238>U and ^<232>Th by Kudo. Neutron- and Proton- induced reactions producing light nuclei like ^<7,10>Be at several tens of MeV are of vital importance in many applications, and several results of excitation functions were reported by Imamura and Shibata. An extremely sensitive measurement of long-lived radionuclides has been established by Kobayashi, Nagai and Imamura, and successfully applied to some of the above-mentioned reaction studies. Combined discussions were performed by exchanging information obtained during the course of the present project, and our prospects for further developments in this field have been exploited. Less