نتایج جستجو برای: photon and neutron flux

تعداد نتایج: 16868852  

2012
M. J. J. Koster-Ammerlaan P. Bode A. J. M. Winkelman

The assumption that the shape of the epithermal neutron spectrum can be described, in any research reactor, by the 1/E1+α function is a fundamental starting point of the k0 standardization. This assumption may be questioned from a reactor physics viewpoint. The type of moderator, the existence of neutron reflectors, the additional production of (γ, n) neutrons and resonance capture by construct...

2008
L. Bellagamba D. Boscherini A. Bruni G. Bruni G. Cara Romeo L. Cifarelli F. Cindolo A. Contin M. Corradi S. De Pasquale P. Giusti G. Iacobucci G. Levi A. Margotti R. Nania F. Palmonari A. Pesci G. Sartorelli A. Zichichi

The production of neutrons carrying at least 20% of the proton beam energy (xL > 0.2) in e+p collisions has been studied with the ZEUS detector at HERA for a wide range of Q2, the photon virtuality, from photoproduction to deep inelastic scattering. The neutron-tagged cross section, ep → eXn, is measured relative to the inclusive cross section, ep → eX, thereby reducing the systematic uncertain...

2000
Mark Alford Jürgen Berges Krishna Rajagopal

We discuss the Meissner effect for a color superconductor formed by cold dense quark matter. Though color and ordinary electromagnetism are broken in a color superconductor, there is a linear combination of the photon and a gluon that remains massless. Consequently, a color superconducting region may be penetrated by an external magnetic field. We show that at most a small fraction of the magne...

2003
M. L. Litvak I. G. Mitrofanov A. S. Kozyrev A. B. Sanin W. V. Boynton

We analyze the flux of epithermal neutrons from the Martian surface recorded by the Russian HighEnergy Neutron Detector (HEND) from February 19 through December 19, 2002. The HEND was installed onboard the NASA 2001 Mars Odyssey spacecraft and is designed to measure neutron fluxes with energies above 1 eV. Over the period of observations, statistically significant variations in the flux of epit...

2013
Mohammad Taghi Bahreyni Toossi Marziyeh Behmadi Mahdi Ghorbani Hamid Gholamhosseinian

Several investigators have pointed out that electron and neutron contamination from high-energy photon beams are clinically important. The aim of this study is to assess electron and neutron contamination production by various prostheses in a high-energy photon beam of a medical linac. A 15 MV Siemens PRIMUS linac was simulated by MCNPX Monte Carlo (MC) code and the results of percentage depth ...

Journal: :Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1986

Journal: :BMJ 1991
R D Errington D Ashby S M Gore K R Abrams S Myint D E Bonnett S W Blake T E Saxton

OBJECTIVE To compare high energy fast neutron treatment with conventional megavoltage x ray treatment in the management of locally advanced pelvic carcinomas (of the cervix, bladder, prostate, and rectum). DESIGN Randomised study from February 1986; randomisation to neutron treatment or photon treatment was unstratified and in the ratio of 3 to 1 until January 1988, when randomisation was in ...

2003
David S. Followill Marilyn S. Stovall Stephen F. Kry Geoffrey S. Ibbott

The shielding calculations for high energy (>10 MV) linear accelerators must include the photoneutron production within the head of the accelerator. Procedures have been described to calculate the treatment room door shielding based on the neutron source strength (Q value) for a specific accelerator and energy combination. Unfortunately, there is currently little data in the literature stating ...

Journal: :Physical chemistry chemical physics : PCCP 2011
Hiromitsu Maeda Nazuki Eifuku Yohei Haketa Yoshihiro Ito Eunji Lee Myongsoo Lee

Wedge-shaped amphiphilic derivatives of 1,3-dipyrrolyl-1,3-propanedione boron complexes, with one or no aliphatic chains attached at one aryl moiety and three hydrophilic chains at the other, exhibited formation of assembled structures in aqueous solutions. UV/vis, fluorescence and DLS analyses suggested that the wedge-shaped amphiphiles exist in assembled modes in the solution state, and TEM m...

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