2,292 research outputs found
Systematic studies of binding energy dependence of neutron - proton momentum correlation function
Hanbury Brown-Twiss (HBT) results of the neutron-proton correlation function
have been systematically investigated for a series nuclear reactions with light
projectiles with help of Isospin-Dependent Quantum Molecular Dynamics model.
The relationship between the binding energy per nucleon of the projectiles and
the strength of the neutron-proton HBT at small relative momentum has been
obtained. Results show that neutron-proton HBT results are sensitive to the
binding energy per nucleon.Comment: 10 pages, 5 figures; accepted by Journal of Physics G: Nuclear and
Particle Physic
Spin transfer torques in nonlocal lateral spin valve
We report a theoretical study on the spin and electron transport in the
nonlocal lateral spin valve with non-collinear magnetic configuration. The
nonlocal magnetoresistance, defined as the voltage difference on the detection
lead over the injected current, is derived analytically. The spin transfer
torques on the detection lead are calculated. It is found that spin transfer
torques are symmetrical for parallel and antiparallel magnetic configurations,
which is different from that in conventional sandwiched spin valve.Comment: 7 papges, 5 figure
Nucleon-nucleon momentum correlation function for light nuclei
Nucleon-nucleon momentum correlation function have been presented for nuclear
reactions with neutron-rich or proton-rich projectiles using a nuclear
transport theory, namely Isospin-Dependent Quantum Molecular Dynamics model.
The relationship between the binding energy of projectiles and the strength of
proton-neutron correlation function at small relative momentum has been
explored, while proton-proton correlation function shows its sensitivity to the
proton density distribution. Those results show that nucleon-nucleon
correlation function is useful to reflect some features of the neutron- or
proton-halo nuclei and therefore provide a potential tool for the studies of
radioactive beam physics.Comment: Talk given at the 18th International IUPAP Conference on Few-Body
Problems in Physics (FB18), Santos, Brasil, August 21-26, 2006. To appear in
Nucl. Phys.
Stability of 1+1 dimensional causal relativistic viscous hydrodynamics
The stability of the 1+1 dimensional solution of Israel-Stewart theory is
investigated. Firstly, the evolution of the temperature and the ratio of the
bulk pressure over the equilibrium pressure of the background is explored. Then
the stability with linear perturbations is studied by using the Lyapunov direct
method. It shows that the shear viscosity may weaken the instability induced by
the large peak of bulk viscosity around the phase transition temperature .Comment: 18 pages, 4 figures, 1 table; to be published in Nuclear Physics
Seasonal variation of the deep limb of the Pacific Meridional Overturning circulation at Yap-Mariana junction
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Wang, J., Ma, Q., Wang, F., Lu, Y., & Pratt, L. J. Seasonal variation of the deep limb of the Pacific Meridional Overturning circulation at Yap-Mariana junction. Journal of Geophysical Research: Oceans, 125(7), (2020): e2019JC016017, doi:10.1029/2019JC016017.This study reveals the seasonal variability of the lower and upper deep branches of the Pacific Meridional Overturning Circulation (LâPMOC and UâPMOC) in the YapâMariana Junction (YMJ) channel, a major gateway for deep flow into the western Pacific. On the western side of the YMJ channel, mooring observations in 2017 and in 1997 show the seasonal phase of the LâPMOC at depths of 3,800â4,400 m: strong northward flow with speed exceeding 20 cm sâ1 and lasting from December to next May and weak flow during the following 6 months. On the eastern side of the channel, mooring observations during 2014â2017 show two southward deep flows with broadly seasonal phases, one being the return flow of LâPMOC below ~4,000 m and with the same phase of LâPMOC but reduced magnitude. The second, shallower, southward deep flow corresponds to the UâPMOC observed within 3,000â3,800 m and with opposite phase of LâPMOC, that is, strong (weak) southward flow appearing during JuneâNovember (DecemberâMay). Seasonal variations of the LâPMOC and UâPMOC are accompanied by the seasonal intrusions of the Lower and Upper Circumpolar Waters (LCPW and UCPW) in lower and upper deep layers, which change the isopycnal structure and the deep currents in a way consistent with geostrophic balance.This study is supported by the National Natural Science Foundation of China (grants 91958204 and 41776022), the Strategic Priority Research Program of the Chinese Academy of Sciences (grant XDA22000000), the Key Research Program of Frontier Sciences, CAS (grant QYZDBâSSWâSYS034). F. Wang thanks the support from the Scientific and Technological Innovation Project by Qingdao National Laboratory for Marine Science and Technology (grant 2016ASKJ12), the National Program on Global Change and AirâSea Interaction (grant GASIâIPOVAIâ01â01), and the National Natural Science Foundation of China (grants 41730534 and 41421005). L. Pratt gratefully acknowledges the support by NSF (grant OCEâ1657870). Jianing Wang and Qiang Ma contributed equally to this work
Statistical nature of cluster emission in nuclear liquid-vapour phase coexistence
The emission of nuclear clusters is investigated within the framework of
isospin dependent lattice gas model and classical molecular dynamics model. It
is found that the emission of individual cluster which is heavier than proton
is almost Poissonian except near the transition temperature at which the system
is leaving the liquid-vapor phase coexistence and the thermal scaling is
observed by the linear Arrhenius plots which is made from the average
multiplicity of each cluster versus the inverse of temperature in the liquid
vapor phase coexistence. The slopes of the Arrhenius plots, {\it i.e.} the
"emission barriers", are extracted as a function of the mass or charge number
and fitted by the formula embodied with the contributions of the surface energy
and Coulomb interaction. The good agreements are obtained in comparison with
the data for low energy conditional barriers. In addition, the possible
influences of the source size, Coulomb interaction and "freeze-out" density and
related physical implications are discussed
Effects of final state interactions on charge separation in relativistic heavy ion collisions
Charge separation is an important consequence of the Chiral Magnetic Effect.
Within the framework of a multi-phase transport model, the effects of final
state interactions on initial charge separation are studied. We demonstrate
that charge separation can be significantly reduced by the evolution of the
Quark-Gluon Plasma produced in relativistic heavy ion collisions. Hadronization
and resonance decay can also affect charge separation. Moreover, our results
show that the Chiral Magnetic Effect leads to the modification of the relation
between the charge azimuthal correlation and the elliptic flow that is expected
from transverse momentum conservation only. The transverse momentum and
pseudorapidity dependences of, and the effects of background on the charge
azimuthal correlation are also discussed.Comment: 14 pages, 7 figures; v2: 3 figures added, discussions extende
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