19,023 research outputs found
Inclusive and pion production neutrino-nucleus cross sections
We analyze the experimental data on the inclusive double differential cross
section by neutrinos charged current, measured by T2K, with the same model
which was successful for the MiniBooNE quasielastic cross sections. As in our
previous analysis the multinucleon component is needed in order to reproduce
the data. For the total cross section our evaluation is smaller than the
SciBooNE data above 1 GeV. This indicates the opening of a new channel not
included in our evaluation, presumably the two pion emission channel. We also
check that our description holds for the exclusive single pion production
channel by confronting our evaluation with the MiniBooNE double differential
cross section for a single charged pion and the Q^2 distribution. Both are
compatible with data
Neutrino versus antineutrino cross sections and CP violation
We discuss the nuclear interactions of neutrinos versus those of
antineutrinos, a relevant comparison for CP violation experiments in the
neutrino sector. We consider the MiniBooNE quasielastic-like double
differential neutrinos and antineutrinos cross sections which are flux
dependent and hence specific to the MiniBooNE set-up. We combine them
introducing their sum and their difference. We show that the last combination
can bring a general information, which can be exploited in other experiments,
on the nuclear matrix elements of the axial vector interference term. Our
theoretical model reproduces well the two cross sections combinations. This
confirms the need for a sizeable multinucleon component in particular in the
interference term
Neutrino quasielastic interaction and nuclear dynamics
We investigate the double differential neutrino-carbon quasielastic cross
sections as measured by the MiniBooNE experiment. Our present treatment
incorporates relativistic corrections in the nuclear response functions and
includes the multinucleon component. We confirm our previous conclusion that it
is possible to account for all the data without any modification of the axial
mass. We also introduce the Q^2 distribution for charged and neutral current.
The data point at a sizable multinucleon component beside the genuine
quasielastic peak. They are also indicative of the collective character of the
nuclear response, of interest for hadronic physics.Comment: Two figures added and two figures modifie
Energy reconstruction effects in neutrino oscillation experiments and implications for the analysis
Data on neutrino oscillation often involve reconstructed neutrino energies
while the analysis implies the real neutrino energy. The corrections
corresponding to the transformation from real to reconstructed energy are
discussed in the case of Cherenkov detectors where multinucleon events appear
as quasielastic ones. These corrections show up as a tendency for the events to
escape the region of high flux, with a clear preference for the low energy
side. This is an effect of the multinucleon component of the quasielastic cross
section. We have applied our corrections to the T2K and MiniBooNE data for
electron appearance or disappearance data. We show that the inclusion
of this correction in the analysis is expected to lead to an increase of the
best fit oscillation mass parameters, particularly pronounced for the MiniBooNE
neutrino data. This inclusion in the analysis of the MiniBooNE neutrino data
should improve the compatibility with the existing constraints
Neutrino energy reconstruction problems and neutrino oscillations
We discuss the accuracy of the usual procedure for neutrino energy
reconstruction which is based on the quasielastic kinematics. Our results are
described in terms of a probability distribution for a real neutrino energy
value. Several factors are responsible of the deviations from the reconstructed
value. The main one is the multinucleon component of the neutrino interaction
which in the case of Cherenkov detectors enters as a quasielastic cross
section, increasing the mean neutrino energy which can differ appreciably from
the reconstructed value. As an application we derive, for excess electron
events attributed to the conversion of muon neutrinos, the true neutrino energy
distribution based on the experimental one which is given in terms of the
reconstructed value. The result is a reshaping effect. For MiniBooNE the low
energy peak is suppressed and shifted at higher energies, which may influence
the interpretation in terms of oscillation. For T2K at the Super Kamiokande far
detector the reshaping translates into a narrowing of the energy distribution
Nuclear response functions with finite range Gogny force: tensor terms and instabilities
A fully-antisymmetrized random phase approximation calculation employing the
continued fraction technique is performed to study nuclear matter response
functions with the finite range Gogny force. The most commonly used parameter
sets of this force, as well as some recent generalizations that include the
tensor terms are considered and the corresponding response functions are shown.
The calculations are performed at the first and second order in the continued
fraction expansion and the explicit expressions for the second order tensor
contributions are given. Comparison between first and second order continued
fraction expansion results are provided. The differences between the responses
obtained at the two orders turn to be more pronounced for the forces including
tensor terms than for the standard Gogny ones. In the vector channels the
responses calculated with Gogny forces including tensor terms are characterized
by a large heterogeneity, reflecting the different choices for the tensor part
of the interaction. For sake of comparison the response functions obtained
considering a G-matrix based nuclear interaction are also shown. As first
application of the present calculation, the possible existence of spurious
finite-size instabilities of the Gogny forces with or without tensor terms has
been investigated. The positive conclusion is that all the Gogny forces, but
the GT2 one, are free of spurious finite-size instabilities. In perspective,
the tool developed in the present paper can be inserted in the fitting
procedure to construct new Gogny-type forces
Hubungan antara Pengetahuan Lingkungan dengan Perilaku Prolingkungan Sekolah Adiwiyata (Studi Kasus Sdn 21 Taluak Kab. Agam)
Penelitian bertujuan untuk menganalisis hubungan pengetahuan lingkungan dengan perilaku prolingkungan pada peserta didik sekolah dasar (SD) Adiwiyata. Perilaku prolingkungan dianalisis dengan model teori Lawrence Green dan pengetahuan lingkungan diukur menggunakan skala NEP. Hasil penelitian ini sesuai dengan teori Lawrence Green yakni pengetahuan lingkungan tidak berhubungan dengan perilaku prolingkungan pada peserta didik sekolah Adiwiyata. Hasil analisis perilaku prolingkungan didapatkan bahwa perilaku prolingkungan sekolah Adiwiyata sangat baik. Dengan demikian program Adiwiyata mempunyai pengaruh positif dalam mengubah perilaku prolingkunga
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