نتایج جستجو برای: alpha particle
تعداد نتایج: 374116 فیلتر نتایج به سال:
Plutonium and uranium isotopes decay by alpha particle emission. The alpha particle is absorbed by the nuclei of the low atomic number elements (Li, B, Be, O, F, C, Si, etc.) and a neutron is produced. The yield depends upon the chemical composition of the matrix and the alpha production rate for plutonium and uranium. Neutrons from (α,n) reactions are produced randomly (not time-correlated) an...
We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN’s Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. We argue that initial spectroscopy measurements, once antihydrogen is trapped, could provide competitive t...
Plutonium and uranium isotopes decay by alpha particle emission. The alpha particle is absorbed by the nuclei of the low atomic number elements (Li, b, be, O, F, C, Si, etc.) and a neutron is produced. The yield depends upon the chemical composition of the matrix and the alpha production rate for plutonium and uranium. Neutrons from (α,n) reactions are produced randomly (not time-correlated) an...
Background: CdWO4 is a scintillator with some unique properties. For example, high density, thermal and chemical stability and so on. Different applications of this scintillator such as X-ray scintillator has been investigated thoroughly so far. However, there is limited number of studies reporting the characteristics of CdWO4 as an alpha counter. Materials and Methods: The CdWO4 powder was syn...
The lightest isotope of Bh was produced in the new 209Bi(52Cr,n)260Bh reaction at the Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. Positive identification was made by observation of eight correlated alpha particle decay chains in the focal plane detector of the Berkeley Gas-Filled Separator. 260Bh decays with a 35(-9)(+19) ms half-life by alpha particle emission mainly by a group ...
Pseudo three-dimensional (3D) polyallyldiglycol carbonate (PADC) cell culture substrates were fabricated by creating micrometer-size pores on thin PADC films by alpha-particle irradiation and subsequent chemical etching. Our results showed comparatively fewer 53BP1 foci in alpha-particle irradiated as well as bystander HeLa cells cultured on pseudo 3D PADC substrates than in those cultured on t...
شروع زود هنگام دیابت نوع دو را به صورت خانوادگی maturity-onset diabet of the young (mody) می گویند. جهش در شش ژن سبب انواع mody می شود. mody3 که به دلیل جهش در ژن (hepatic nuclear factor) hnf1-alpha ایجاد می شود، در بین انواع دیگر mody عمومیت بیشتری دارد. پروتئین hnf1-alpha یک فاکتور رونویسی است که در ترشح انسولین توسط سلول های بتا پانکراس نقش دارد. جهش در ژن hnf1-alpha سبب نقص در ترشح انسولی...
The stability of proposed burning-plasma scenarios (for ITER-FEAT, IGNITOR and FIRE) with respect to shear-Alfvén modes possibly driven by fusionproduced alpha particles is investigated along with the effects of such modes on the transport and confinement properties of the alpha particles themselves. The results of numerical particle-in-cell model simulations show that one of the proposed scena...
Real collective density variables C(k) [cf. Eq. 1 3 ] in many-particle systems arise from nonlinear transformations of particle positions, and determine the structure factor S(k) , where k denotes the wave vector. Our objective is to prescribe C(k) and then to find many-particle configurations that correspond to such a target C(k) using a numerical optimization technique. Numerical results repo...
We examined the induction of HPRT mutations in CHO cells exposed to low fluences of (238)Pu alpha particles from a specially constructed irradiator. The dose-response relationship was linear over the dose range of 5 cGy-1.2 Gy. However, unexpected sensitivity, leading to a significantly higher frequency of mutations than would be predicted by a back extrapolation from the data for higher doses,...
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