نتایج جستجو برای: neutron effect

تعداد نتایج: 1684090  

اطاعتی, غلامرضا, امراللهی, رضا, دوست‌محمدی, وحید,

The silver activation counters are commonly used for pulsed-neutron yield measurements especially in plasma focus devices. The counter normally consists of a Geiger-Muller tube along with silver foils and polyethylene (as a moderator), which is calibrated against an Am-Be radioisotope neutron source. The neutrons, after being slowed-down in the polyethylene, activate the silver foils. By measur...

2003
H. Koivunoro T. P. Lou J. Reijonen K-N Leung

Boron-neutron capture therapy (BNCT) is an experimental radiation treatment modality used for highly malignant tumor treatments. Prior to irradiation with low energetic neutrons, a B compound is located selectively in the tumor cells. The effect of the treatment is based on the high LET radiation released in the B(n,α)Li reaction with thermal neutrons. BNCT has been used experimentally for brai...

Journal: :Physical review letters 2015
J L Tain E Valencia A Algora J Agramunt B Rubio S Rice W Gelletly P Regan A-A Zakari-Issoufou M Fallot A Porta J Rissanen T Eronen J Äystö L Batist M Bowry V M Bui R Caballero-Folch D Cano-Ott V-V Elomaa E Estevez G F Farrelly A R Garcia B Gomez-Hornillos V Gorlychev J Hakala M D Jordan A Jokinen V S Kolhinen F G Kondev T Martínez E Mendoza I Moore H Penttilä Zs Podolyák M Reponen V Sonnenschein A A Sonzogni

Total absorption spectroscopy is used to investigate the β-decay intensity to states above the neutron separation energy followed by γ-ray emission in (87,88)Br and (94)Rb. Accurate results are obtained thanks to a careful control of systematic errors. An unexpectedly large γ intensity is observed in all three cases extending well beyond the excitation energy region where neutron penetration is...

1997
Chris Fryer Vassiliki Kalogera

We study the four double neutron star systems found in the Galactic disk in terms of the orbital characteristics of their immediate progenitors and the natal kicks imparted to neutron stars. Analysis of the effect of the second supernova explosion on the orbital dynamics, combined with recent results from simulations of rapid accretion onto neutron stars lead us to conclude that the observed sy...

1998
Y. F. Yuan

The effect of a strong magnetic field on the modified Urca process in neutron star cores is considered in this paper. It is found that this effect is significant when the interior magnetic field is greater than 1018 G, especially at some resonant states. In these situations, the strong magnetic field will significantly increase the rate of neutrino emission and influence the cooling of neutron ...

2006
L. G. Cao U. Lombardo P. Schuck

Effects of medium polarization are studied for 1S0 pairing in neutron and nuclear matter. The screening potential is calculated in the RPA limit, suitably renormalized to cure the low density mechanical instability of nuclear matter. The selfenergy corrections are consistently included resulting in a strong depletion of the Fermi surface. All medium effects are calculated based on the Brueckner...

2017
A. S. Malgin

The cosmogenic neutron yield Yn characterizes the matter ability to produce neutrons under the effect of cosmic ray muons with spectrum and average energy corresponding to an observation depth. The yield is the basic characteristic of cosmogenic neutrons. The neutron production rate and neutron flux both are derivatives of the yield. The constancy of the exponents α and β in the known dependenc...

2008
Plamen G. Krastev Bao-An Li

Properties, structure, and thermal evolution of neutron stars are determined by the equation of state of stellar matter. Recent data on isospin-diffusion and isoscaling in heavy-ion collisions at intermediate energies as well as the size of neutron skin in Pb have constrained considerably the density dependence of the nuclear symmetry energy and, in turn, the equation of state of neutron-rich n...

2014
D Nekrassov C Zendler K Lieutenant

8 Elliptic neutron guides are expected to be widely used for construction of long neutron 9 beamlines at the future European Spallation Source and other facilities due to their superiour 10 transmission properties compared to conventional straight guides. At the same time, neutrons 11 traveling long distances are subject to the action of gravity that can significantly modify their 12 flight pat...

2005
P. Batham I. J. Thompson J. A. Tostevin

The effects of core deformation and of its dynamical reorientation and rotational excitation on the inclusive single-neutron knockout reaction cross sections on light spherical target nuclei are examined. The projectile nuclei are modeled within the framework of a weak-coupling, quadrupole-deformed core-plus-neutron two-body model. We formulate the inclusion of this non-spectator-core degree of...

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