scholarly journals Studying the coherent channel of neutral current ν-nucleus interaction

2019 ◽  
Vol 21 ◽  
pp. 177
Author(s):  
V. Tsakstara ◽  
T. S. Kosmas
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Random Phase ◽  
Neutrino Energy ◽  
Energy Distributions ◽  
Quasi Particle ◽  
Neutrino Scattering ◽  
Supernova Neutrino ◽  
Power Law Distributions ◽  
Beta Beam

Original cross-sections calculations for neutral current neutrino scattering on 40Ar isotope are performed in the context of the quasi-particle random phase approximation (QRPA) by utilizing realistic two-nucleon forces. The incoming neutrino energy range adopted, εν ≤ 100 MeV, covers the supernova neutrinos, the low-energy beta-beam-neutrinos and the pion-muon stopped neutrino-beams existing or planned to be conducted at future neutron spallation sources. Subsequently, are the original cross sections convoluted with various supernova neutrino-energy distributions such as the two-parameter Fermi-Dirac and the power law distributions. The folded cross sections are obtained for various values of the parameters of these neutrino energy distributions corresponding to different supernova scenarios. One of the main purposes of this work is to explore the response of the 40Ar isotope as supernova neutrino detector.

scholarly journals Cross sections for the neutral current νe - 116Cd scattering reaction

2020 ◽  
Vol 16 ◽  
pp. 97
Author(s):  
K. G. Balasi ◽  
T. S. Kosmas ◽  
P. C. Divari ◽  
V. C. Chasioti
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Random Phase ◽  
Initial Energy ◽  
Electron Neutrino ◽  
Excitation Energies ◽  
Quasi Particle ◽  
Neutrino Scattering ◽  
Supernova Neutrino ◽  
Nuclear Response

The cross sections for neutrino scattering off the 116Cd nucleus have been computed by utilizing the Quasi-particle Random Phase Approximation (QRPA). An- gular and initial energy dependence of the neutrino-nucleus cross sections have been calculated at low and intermediate electron neutrino energies up to 100 MeV. By solving the QRPA equations and fixing the appropriate parameters the lowest lying excitation energies spectrum was reproduced. The contributions from multipole ex- citations was examined. The obtained results could be used for studying the nuclear response of this isotope to supernova neutrino spectra.

scholarly journals Cross section calculations for neutrino-nucleus reactions at low and intermediate energies.

2020 ◽  
Vol 15 ◽  
pp. 249
Author(s):  
V. Ch. Chasioti ◽  
T. S. Kosmas ◽  
P. Divari
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Axial Vector ◽  
Random Phase ◽  
Neutrino Energy ◽  
Reaction Cross ◽  
Neutrino Experiment ◽  
Final State ◽  
Quasi Particle ◽  
Intermediate Energies

Inelastic neutrino-nucleus reaction cross sections are studied focusing on the neutral current processes. Particularly, we investigate the angular and initial neutrino-energy dependence of the differential and integrated cross sections for low and intermediate energies of the incoming neutrino (or antineutrino). Contributions coming from both, the vector and axial-vector components of the corresponding hadronic currents have been included. The initial and final state nuclear wave-functions have been calculated in the context of the Quasi-particle Random Phase Approximation (QRPA) tested on the reproducibility of the low-lying energy spectrum (up to about 5 MeV) of the studied nuclei. The results presented here refer to the nuclear isotopes 16O and 98Mo. As it is well known, O plays a significant role in supernova evolution phenomena and Mo is used as a target in the MOON neutrino experiment at Japan.

scholarly journals Coherent and Incoherent Neutral Current Scattering for Supernova Detection

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
P. C. Divari
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Neutrino Energy ◽  
Total Cross Sections ◽  
Neutrino Scattering ◽  
Neutrino Detection ◽  
Supernova Neutrino ◽  
Dirac Distribution ◽  
The Individual ◽  
Event Rates

The total cross sections as well as the neutrino event rates are calculated in the neutral current neutrino scattering off40Ar and132Xe isotopes at neutrino energies (Ev<100 MeV). The individual contribution coming from coherent and incoherent channels is taking into account. An enhancement of the neutral current component is achieved via the coherent (0gs+→0gs+) channel which is dominant with respect to incoherent (0gs+→Jf) one. The response of the above isotopes as a supernova neutrino detection has been considered, assuming a two parameter Fermi-Dirac distribution for the supernova neutrino energy spectra. The calculated total cross sections are tested on a gaseous spherical TPC detector dedicated for supernova neutrino detection.

ν − ν interactions in supernovae environments as a function of density and temperature

2021 ◽  
Vol 30 (03) ◽  
pp. 2150018
Author(s):  
M. P. Colombi ◽  
O. Civitarese ◽  
A. V. Penacchioni
Keyword(s):  
Density Dependence ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Neutrino Energy ◽  
Phase Approximation ◽  
Temperature Dependent ◽  
Energy Distributions ◽  
Quasi Particle ◽  
Collective Response ◽  
Bogoliubov Transformations

Neutrinos in astrophysical environments, such as Supernovae (SNe), may interact through pair interactions. These interactions are density and temperature-dependent. Under certain conditions, a neutrino-condensate may form. In this work, we have adapted the separable nonlocal pairing interactions to the SN conditions and studied the temperature and density dependence of the pairing gap as well as the collective response with respect to these variables. We have applied the Bogoliubov transformations and solved the Bardeen, Cooper and Schrieffer (BCS) equations to construct the free quasi-particle sector of the Hamiltonian. The residual two-quasi-particle terms have been treated by applying the Tamm–Dancoff approximation (TDA) and random-phase approximation (RPA), suited to the extended neutrino media. With this, we have constructed neutrino energy distributions both in the superfluid and normal regimes and extracted critical values of the density and temperature.

scholarly journals Nuclear response to supernova neutrino spectra

2019 ◽  
Vol 18 ◽  
pp. 187
Author(s):  
V. Tsakstara ◽  
T. S. Kosmas ◽  
J. Sinatkas
Keyword(s):  
Cross Sections ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Rare Event ◽  
Double Beta Decay ◽  
Low Energy ◽  
Quasi Particle ◽  
Supernova Neutrino ◽  
Nuclear Targets ◽  
Nuclear Response

In current probes searching for rare event processes, appropriate nuclear targets are employed (in the COBRA double-beta decay detector the CdZnTe semiconductor is used). In this work the response of such detectors to various low-energy neutrino spectra is explored starting from state-by-state calculations of the neutrino-nucleus reactions cross sections obtained by using the quasi particle random phase approximation (QRPA) based on realistic two-body residual interactions. As a concrete example, we examine the response of 64Zn isotope to low energy supernova neutrinos.

scholarly journals Neutral current neutrino-94Mo scattering in the context of the QRPA method

2019 ◽  
Vol 18 ◽  
pp. 31
Author(s):  
K. G. Balasi ◽  
T. S. Kosmas
Keyword(s):  
Cross Sections ◽  
Random Phase Approximation ◽  
Neutral Current ◽  
Random Phase ◽  
Reaction Rates ◽  
Systematic Investigation ◽  
Wave Functions ◽  
Phase Approximation ◽  
Quasi Particle ◽  
Intermediate Energies

A systematic investigation of neutrino-nucleus reaction rates at low and intermediate energies of the stable 94Mo isotope is performed. Differential and integrated cross sections for neutrino inelastic scattering off the aforementioned target are calculated for neutrino energies εi ≼ 100 MeV. The nuclear wave functions for the initial and final nuclear states are constructed in the context of the quasi-particle random phase approximation (QRPA). The reliability of our method is tested by checking the reproducibility of the low-lying energy spectrum of the isotope under investigation.

scholarly journals Studying supernova neutrinos through nuclear structure calculations

2019 ◽  
Vol 18 ◽  
pp. 193
Author(s):  
V. Tsakstara ◽  
T. S. Kosmas ◽  
J. Sinatkas
Keyword(s):  
Cross Sections ◽  
Random Phase ◽  
Neutrino Energy ◽  
Double Beta Decay ◽  
Quasi Particle ◽  
Supernova Neutrinos ◽  
Nuclear Structure Calculations ◽  
Structure Calculations ◽  
Two Parameter ◽  
Astrophysical Neutrino

Differential and integrated cross section calculations are performed in the context of the quasi particle random phase approximation (QRPA) by utilizing realistic two- nucleon forces, for the 64,66 Zn isotopes, contents of the COBRA double beta decay detector. For these isotopes the response to supernova neutrinos is of current inter- est. The response of the 66 Zn isotope to the energy-spectra of supernova neutrinos is also explored by convoluting the original results for the differential cross sections by employing: (i) a two-parameter Fermi-Dirac (FD) and (ii) a Power-Law (PL) neutrino energy distribution. Such folded cross sections are useful in low-energy astrophysical-neutrino detection in underground terrestrial experiments.

scholarly journals Neutral-Current Neutrino-Nucleus Scattering off Xe Isotopes

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
P. Pirinen ◽  
J. Suhonen ◽  
E. Ydrefors
Keyword(s):  
Nuclear Structure ◽  
Cross Sections ◽  
Direct Detection ◽  
Neutral Current ◽  
Random Phase ◽  
Solar Neutrinos ◽  
Neutrino Energy ◽  
Quasiparticle Random Phase Approximation ◽  
Nucleus Scattering ◽  
Nuclear Structure Calculations

Large liquid xenon detectors aiming for dark matter direct detection will soon become viable tools also for investigating neutrino physics. Information on the effects of nuclear structure in neutrino-nucleus scattering can be important in distinguishing neutrino backgrounds in such detectors. We perform calculations for differential and total cross sections of neutral-current neutrino scattering off the most abundant xenon isotopes. The nuclear-structure calculations are made in the nuclear shell model for elastic scattering and also in the quasiparticle random-phase approximation (QRPA) and microscopic quasiparticle-phonon model (MQPM) for both elastic and inelastic scattering. Using suitable neutrino energy distributions, we compute estimates of total averaged cross sections for ​8B solar neutrinos and supernova neutrinos.

scholarly journals Convolutedν-Signals on114Cd Isotope from Astrophysical and Laboratory Neutrino Sources

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Vaitsa Tsakstara
Keyword(s):  
Cross Sections ◽  
Neutral Current ◽  
Random Phase ◽  
Intermediate Energy ◽  
Double Beta Decay ◽  
Quasiparticle Random Phase Approximation ◽  
Simulation Techniques ◽  
Nucleus Scattering ◽  
Reactor Neutrinos ◽  
Scattering Cross Sections

At first, we evaluate scattering cross sections of low, and intermediate-energy neutrinos scattered off the114Cd isotope, the most abundant Cd isotope present also in the COBRA detector (CdTe and CdZnTe materials) which aims to search for double beta decay events and neutrino observations at Gran Sasso laboratory (LNGS). The coherentν-nucleus channel addressed here is the dominant reaction channel of the neutral currentν-nucleus scattering. Ourν-nucleus cross sections (calculated with a refinement of the quasiparticle random-phase approximation, QRPA) refer to thegs→gstransitions forν-energiesεν≤100 MeV. Subsequently, simulatedν-signals on114Cd isotope are derived. Towards this purpose, the required folded cross section comes out of simulation techniques by employing several low, and intermediate-energy neutrino distributions of the astrophysicalν-sources, like the solar, supernova, and Earth neutrinos, as well as the laboratory neutrinos, the reactor neutrinos, the pion-muon stopped neutrinos, and theβ-beam neutrinos.

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