tailieunhanh - Báo cáo " DETERMINING THE ISOMERIC RATIO OF NUCLEAR REACTION 46 Ti (γ, pn)44 Sc BY EXPERIMENT "

The bremsstrahlung beam with energy end point of 65M eV created when the e− beam with energy of 65M eV irradiated to thin wolfram target was used to irradiate to TiO2 sample in order to make the 46 Ti (γ, pn)44m,g Sc reaction. The gamma spectrum of Sc44m,g was analyzed by the gammavision spectrometry with HPGe detector at linear accelerator laboratory in POSTECH, Korea. | VNU. JOURNAL OF SCIENCE Mathematics - Physics. N01 - 2005 DETERMINING THE ISOMERIC RATIO OF NUCLEAR REACTION 46Ti YiPn 44Sc BY EXPERIMENT Tran Tri Vien Doan Quang Tuyen Nguyen Trung Tinh College of Science VNU Abstract. The bremsstrahlung beam with energy end point of 65MeV created when the e- beam with energy of 65MeV irradiated to thin wolfram target was used to irradiate to TiO2 sample in order to make the 46Tì yì pn 44m gSc reaction. The gamma spectrum of Sc44m g was analyzed by the gammavision spectrometry with HPGe detector at linear accelerator laboratory in POSTECH Korea. As the result the isomeric ratio Tm Tg of the reaction is presented. 1. Introduction The isomeric ratio data of nuclear take an important role in nuclear structure research and nuclear reaction mechanism that why there are many laboratories in the world studying these. In our experiment the beam of bremsstrahlung radiations is created when e- current with energy of 65MeV irradiating to thin wolfram - target then the bremsstrahlung beam irradiating to TiO2 sample of pure degree. After 2 hours of irradiation the sample disintegrates in a period of time depending on the sample radioactivity. The sample is measured by the geometric arrangement fixed for minimizing the error. The 44 Sc is created by reaction as follows Y 46Ti 44Sc n p. After being produced 44Sc nuclei is in excited states. However the life-time of these states is very short 10-1osec . Then the nuclei jump into the lower energy states and at the end they jump to the isomeric state or ground state. On the other hand 44Sc is a radioactive nuclear. It disintegrates to 44Ca from isomeric state and ground state. The gamma spectrum of 44Sc created from two parts one is due to 44Sc transferred from isomeric state in to ground state and the other is due to 44Ca transferred from higher energy excited states to the lower one or to the ground state . 2. Calculating the essential parameters of reaction In this paper the .

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