Neutrino-nucleus reactions in terrestrial experiments and astrophysics

Tsakstara, V.; Kosmas, T. S.

doi:10.1016/j.ppnp.2009.12.060

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…In the case of the 64 Zn, our results show a pronounced response in the excitation region ω = 10 − 15 MeV. This means that signals of supernova neutrinos of the type ν x and ν x , x = µ, τ (high mean energies), cause much stronger response in this range of excitations of the detector [8][9][10].…”

Section: Resultsmentioning

confidence: 76%

Nuclear response to supernova neutrino spectra

Tsakstara¹,

Kosmas²,

Sinatkas³

2019

hnps

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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 neutrinonucleus 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 64 Zn isotope to low energy supernova neutrinos.

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Section: Resultsmentioning

confidence: 76%

Nuclear response to supernova neutrino spectra

Tsakstara¹,

Kosmas²,

Sinatkas³

2019

hnps

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“…A similar expression is the analytically simpler two-parameter Power-Law (PL) energy distribution [64,65,71]. Both parametrizations FD and PL yield similar distributions characterized by the temperature or the average ]-energy ⟨ ] ⟩ [8,28,[72][73][74]. It is important to note that the flavour-dependent fluxes and spectra emitted by supernovae at any distance from the source can be different from those originally produced, which is mainly due to neutrino oscillations but also due to other phenomena [70].…”

Section: Supernova Neutrinosmentioning

confidence: 98%

“…Advances in High Energy Physics where numbers the different Lorentz ( ) factors included in the synthetic spectrum (expressions for the individual distributions ( ] ) are given in [7,8,74]). Combinations of the type ( ] ) for -factors up to 10-12 are used to fit original supernova neutrino spectral distributions, SN ( ] ), reaching terrestrial detectors by adjusting the weight parameters through the minimization procedure described in [8,75,76].…”

Section: Low-energy -Beam Neutrinosmentioning

confidence: 99%

Convolutedν-Signals on¹¹⁴Cd Isotope from Astrophysical and Laboratory Neutrino Sources

Tsakstara

2015

Advances in High Energy Physics

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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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“…(6.18), τέτοιων ώστε, το συνθετικό φάσμα η bb (ε ν ) να «συμπίπτει» με το υιοθετηθέν ως πραγματικό φάσμα υπερκαινοφανών νετρίνων η SN (ε ν ). Αρχικά, προκειμένου να γίνει εκτίμηση των πιο σημαντικών όρων του συνθετικού φάσματος, χρησιμοποιήθηκαν προγράμματα προσεγγιστικής προσομοίωσης MATLAB [262]. Λόγω αδυναμίας του πακέτου MATLAB που είχαμε στη 6.…”

Section: προσαρμογή συνθετικών φασμάτων σε κατανομές υπερκαινοφανών νετρίνωνunclassified

“…Τα συνθετικά φάσματα περιλαμβάνουν κατανομές με 9 διαφορετικούς παράγοντες γ, η συμφωνία είναι πολύ καλή (βλέπε [262]). Το συνθετικό φάσμα μεγιστοποιείται σε ελαφρά υψηλότερες ενέργειες από ό,τι το πρωτογενές.…”

Section: αναδιπλωμένες ολικές ενεργές διατομές με κατανομές συνθετικών φασμάτωνunclassified

Μελέτη Αστροφυσικών Νετρίνων Με Τεχνικές Προσομοίωσης Και Υπολογισμούς Πυρηνικής Δομής

Τσακστάρα¹

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Study of astrophysical neutrinoswith simulation techniques and nuclear structure calculations by: Vaitsa Tsakstara In the present Thesis, we investigated low and intermediate energy astrophysical neutrinos, by performing nuclear structure calculations and employing modern simulation techniques. One of our main goals, was to explore the nuclear response to supernova neutrino energy spectra of various nuclear detectors used recently in terrestrial experiments searching for events of rare process, like the neutrinoless double beta decay, that take place in the presence of nuclei.We concentrated on the systematic studies of the neutrino-nucleus reactions 64,66 Zn(ν, ν ′ ) 64,66 Zn * and 128,130 T e(ν, ν ′ ) 128,130 T e * , as well as the antineutrinonucleus reactions 64,66 Zn( ν, ν ′ ) 64,66 Zn * and 128,130 T e( ν, ν ′ ) 128,130 T e * . The nuclei T e and Zn, are contents of the CdZnT e and CdT e semi-conductors, which are promising detectors of the COBRA double beta decay experiment at Gran Sasso.From a nuclear structure calculations point of view, the original (anti)neutrinonucleus reaction cross sections are evaluated within the context of the quasiparticle random phase approximation (QRPA), by utilizing realistic two-body forces for the strong nucleon-nucleon interaction. We restricted ourselves to the neutral current (anti)neutrino-nucleus reactions, assuming an effective Hamiltonian for the description of the weak interaction between the incoming neutrino and the nuclear target constructed in the framework of the current-current interaction hypothesis, i.e. written as a product of the leptonic times the hadronic (nuclear) current.The detailed original cross sections presented in the present study, refer to the double differential (with respect to anglesΩ and the nuclear excitation energy ω), the single differential (with respect to the nuclear excitation energy ω), as well as to the cumulative (integrated) and the total cross sections. We employed an advantageous numerical approach published by our group recently, which provides state-by-state calculations of the relevant cross sections for all multipolarities emphasizing on the most important ones, i.e. those with J π 8 ± . For all isotopes studied, the differential and total cross sections as functions of the nuclear excitation energy ω, are dominated by contributions originating from the 1 − , 2 + xvii and 1 + multipolarities. We paid special attention on the dependence of the cross sections on the incoming neutrino energies (varying in the region ε ν 100 − 150 MeV), on the nuclear excitation energy of each isotope (ω 30 MeV) and on the other kinematical parameters. Due to the fact that, for all isotopes most of the low-lying transitions induced by the (anti)neutrino-nucleus interaction are the 2 + states, we studied them in more detail.The nuclear response of 64,66 Zn and 128,130 T e isotopes to supernova neutrino spectra, was studied by convoluting the original cross sections with well known supernova (anti)neutrino-energy distributions such as the two pa...

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Neutrino-nucleus reactions in terrestrial experiments and astrophysics

Cited by 7 publications

References 10 publications

Nuclear response to supernova neutrino spectra

Nuclear response to supernova neutrino spectra

Convolutedν-Signals on¹¹⁴Cd Isotope from Astrophysical and Laboratory Neutrino Sources

Μελέτη Αστροφυσικών Νετρίνων Με Τεχνικές Προσομοίωσης Και Υπολογισμούς Πυρηνικής Δομής

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Neutrino-nucleus reactions in terrestrial experiments and astrophysics

Cited by 7 publications

References 10 publications

Nuclear response to supernova neutrino spectra

Nuclear response to supernova neutrino spectra

Convolutedν-Signals on114Cd Isotope from Astrophysical and Laboratory Neutrino Sources

Μελέτη Αστροφυσικών Νετρίνων Με Τεχνικές Προσομοίωσης Και Υπολογισμούς Πυρηνικής Δομής

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Convolutedν-Signals on¹¹⁴Cd Isotope from Astrophysical and Laboratory Neutrino Sources