نتایج جستجو برای: باریکه الکترونهای mev 10
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Results of a phenomenological model to estimate the GRB detection rate by the Fermi Gamma ray Space Telescope are reported. This estimate is based on the BATSE 4B GRB fluence distribution, the mean ratio of fluences measured at 100 MeV – 5 GeV with EGRET and at 20 keV – 2 MeV with BATSE, and the mean EGRET GRB spectrum for the 5 EGRET spark-chamber GRBs. For a 10% fluence ratio and a number spe...
اشتعال سریع یکی از روش های همجوشی لختی icf)) است که درآن مراحل تراکم و اشتعال از یکدیگرجدا شده است. دراین روش انرژی دهی در دو مرحله صورت می گیرد. اول فرآیند فشرده سازی ساچمه های دوتریوم-تریتیم (d-t) توسط لیزر و پرتوهای یونی(مرحله تراکم)، دوم باریکه پرتو پر انرژی از یک نقطه برای ایجاد اشتعال و جرقه احتراق به ساچمه سوخت وارد می گردد (مرحله اشتعال). بعد از تراکم سوخت درون ساچمه در مرحله دوم، باریک...
قدرت تفکیک دستگاه طیف‌نگار جرمی به صورت مستقیم شدت یون خروجی و انرژی آن بستگی دارد. مقدار تولید شده جریان باریکه الکترونی وابسته است. از جمله وظایف مدار کنترل چشمه برخورد تنظیم برای رسیدن بهینه می‌باشد. در ساخت پارامترهایی نظیر تثبیت آن، دقیق پتانسل الکتریکی لنز الکترودهای یونی بسیار حایز اهمیت این مقاله با قابلیت انتشار الکترون، پتانسیل نقاط طراحی ساخته شد. کنترلر بر روی طیف نگار 44Varian MAT ...
Bremsstrahlung including the polarization correlations is revisited by presenting a new model which is applied to the short-wavelength limit. The fast incoming electron is described by a SommerfeldMaue function whereas for the outgoing electron an exact Dirac function is used. The cross section for electrons radiatively scattered from gold is calculated in the impact energy range 0.2–10 MeV and...
We have searched over 9 years of data from the Solar Maximum Mission (SMM) Gamma Ray Spectrometer for gamma-ray bursts (GRBs) with abnormally hard spectra which may have been missed in previous searches in the 0.35{0.8 MeV energy band. For this purpose, we searched the higher 0.8{10 MeV band. We have found only two new GRBs in this search, compared with 177 GRBs found in the 0.35{0.8 MeV band. ...
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
It is greatly expected that the relic neutrino background from past supernovae is detected by Superkamiokande (SK) which is now under construction. We calculate the spectrum and the event rate at SK systematically by using the results of simulations of a supernova explosion and reasonable supernova rates. We also investigate the e ect of a cosmological constant, , on the spectrum, since some re...
We report the COMPTEL detection of pulsed γ-emission from PSR B1509-58 up to at least 10 MeV using data collected over more than 6 years. The 0.75-10 MeV lightcurve is broad and reaches its maximum near radio-phase 0.38, slightly beyond the maximum found at hard X-rays/ soft γ-rays. In the 10-30 MeV energy range a strong source is present in the skymap positionally consistent with the pulsar, b...
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
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