15,315 research outputs found
Double Resonance in Dalitz Plot of M(pLambda)-M(KLambda) in DISTO Data on p+p rightarrow p+Lambda+K+ at 2.85 GeV
The X(2265) resonance was previously observed in DISTO data of p+p rightarrow
p+Lambda+K+ at 2.85 GeV on an attempt of searching for the kaonic nuclear state
K-pp rightarrow p + Lambda. In the present paper we report an additional
finding, namely, a double resonance type phenomena, not only with a peak at
M(pLambda) = 2265 MeV/c2 but also a broad bump at M(K+ Lambda) ~ 1700 MeV/c2.
This "double-resonance" zone is expressed as XY(2265, 1700). The latter bump
may result from nearby nucleon resonances, typically N*(1710), as well as by
attractive K - Lambda final-state interaction. We point out that this double
resonance XY(2265, 1700) as seen in DISTO at 2.85 GeV cannot be populated
kinematically in a HADES experiment at 3.5 GeV.Comment: 4 pages, 3 figures, HYP2015 conferenc
Quantum gate using qubit states separated by terahertz
A two-qubit quantum gate is realized using electronic excited states in a
single ion with an energy separation on the order of a terahertz times the
Planck constant as a qubit. Two phase locked lasers are used to excite a
stimulated Raman transition between two metastable states and
separated by 1.82 THz in a single trapped Ca ion to
construct a qubit, which is used as the target bit for the Cirac-Zoller
two-qubit controlled NOT gate. Quantum dynamics conditioned on a motional qubit
is clearly observed as a fringe reversal in Ramsey interferometry.Comment: 4 pages, 4 figure
Effect of the shape anisotropy on the magnetic configuration of (Ga,Mn)As and its evolution with temperature
We study the effect of the shape anisotropy on the magnetic domain
configurations of a ferromagnetic semiconductor (Ga,Mn)As/GaAs(001) epitaxial
wire as a function of temperature. Using magnetoresistance measurements, we
deduce the magnetic configurations and estimate the relative strength of the
shape anisotropy compared with the intrinsic anisotropies. Since the intrinsic
anisotropy is found to show a stronger temperature dependence than the shape
anisotropy, the effect of the shape anisotropy on the magnetic domain
configuration is relatively enhanced with increasing temperature. This
information about the shape anisotropy provides a practical means of designing
nanostructured spin electronic devices using (Ga,Mn)As.Comment: 4 pages, 4 figures, to appear in J. Appl. Phy
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