223,681 research outputs found
Pulsar Velocity with Three-Neutrino Oscillations in Non-adiabatic Processes
We have studied the position dependence of neutrino energy on the
Kusenko-Segr\`{e} mechanism as an explanation of the proper motion of pulsars.
The mechanism is also examined in three-generation mixing of neutrinos and in a
non-adiabatic case. The position dependence of neutrino energy requires the
higher value of magnetic field such as Gauss in order
to explain the observed proper motion of pulsars. It is shown that possible
non-adiabatic processes decrease the neutrino momentum asymmetry, whereas an
excess of electron neutrino flux over other flavor neutrino fluxes increases
the neutrino momentum asymmetry. It is also shown that a general treatment with
all three neutrinos does not modify the result of the two generation treatment
if the standard neutrino mass hierarchy is assumed.Comment: 8 pages, REVTEX, no figure
Axial Anomaly and the Nucleon Spin
In this letter, we have taken a particular Lagrangian, which was introduced
to resolve U(1) problem, as an effective QCD Lagrangian, and have derived a
formula of the quark content of the nucleon spin. The difference between quark
content of the proton (\Delta\Sigma_p) and that of the neutron (\Delta\Sigma_n)
is evaluated by this formula. Neglecting the higher-order isospin corrections,
this formula can reduce to Efremov's results in the large N_c limit.Comment: (1) A few changes and corrections made following Referee. (2) The
difference between quark content of the proton (\Delta\Sigma_p) and that of
the neutron (\Delta\Sigma_n) is evaluated. Neglecting the higher-order
isospin corrections, this formula can reduce to Efremov's results in the
large N_c limi
Monitoring Frequency of IntraāFraction Patient Motion Using the ExacTrac System for LINACābased SRS Treatments
Purpose: The aim of this study was to investigate the intraāfractional patient motion using the ExacTrac system in LINACābased stereotactic radiosurgery (SRS).
Method: A retrospective analysis of 104 SRS patients with kilovoltage imageāguided setup (Brainlab ExacTrac) data was performed. Each patient was imaged preātreatment, and at two time points during treatment (1st and 2nd midātreatment), and bony anatomy of the skull was used to establish setup error at each time point. The datasets included the translational and rotational setup error, as well as the time period between image acquisitions. After each image acquisition, the patient was repositioned using the calculated shift to correct the setup error. Only translational errors were corrected due to the absence of a 6D treatment table. Setup time and directional shift values were analyzed to determine correlation between shift magnitudes as well as time between acquisitions.
Results: The average magnitude translation was 0.64 Ā± 0.59 mm, 0.79 Ā± 0.45 mm, and 0.65 Ā± 0.35 mm for the preātreatment, 1st midātreatment, and 2nd midātreatment imaging time points. The average time from preātreatment image acquisition to 1st midātreatment image acquisition was 7.98 Ā± 0.45 min, from 1st to 2nd midātreatment image was 4.87 Ā± 1.96 min. The greatest translation was 3.64 mm, occurring in the preātreatment image. No patient had a 1st or 2nd midātreatment image with greater than 2 mm magnitude shifts.
Conclusion: There was no correlation between patient motion over time, in direction or magnitude, and duration of treatment. The imaging frequency could be reduced to decrease imaging dose and treatment time without significant changes in patient position
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