Studying low-energy astrophysical neutrinos with neutrino nucleus cross-section calculations and beta beam neutrino spectra

2011

Phys. Rev. C

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Differential, total, and cumulative cross section calculations for neutral current neutrino scattering on 128,130 Te isotopes are performed in the context of the quasiparticle random phase approximation by utilizing realistic twonucleon forces. These isotopes are the main contents of detectors of ongoing experiments with multiple neutrino physics goals (COBRA and CUORE at Gran Sasso), including potential low-energy astrophysical neutrino (solar, supernova, geoneutrinos) detection. The incoming neutrino energy range adopted in our calculations (ε ν 100 MeV) covers the low-energy β-beam neutrinos and the pion-muon stopped neutrino beams existing or planned to be conducted at future neutron spallation sources. The aim of these facilities is to measure neutrino-nucleus cross sections at low and intermediate neutrino energies with the hope of shedding light on open problems in neutrino-induced reactions on nuclei and neutrino astrophysics. Such probes motivate theoretical studies on weak responses of various nuclear systems; thus the evaluated cross sections may be useful in this direction. V. TSAKSTARA AND T. S. KOSMAS PHYSICAL REVIEW C 83, 054612 (2011) mag(5) J (q) J i | 2The definitions of the eight multipole operators M (5)Obviously, for normal parity transitions, C V A contains contributions of T el J and T mag5 J operators while for abnormal parity ones it contains matrix elements of T mag J and T el5 J . The reduced one-body matrix elements of the eight multipole operators entering Eqs. (9) and (10) are evaluated through the use of the analytic formulas derived in Ref. [8] (see the Appendix).The magnitude of the three-momentum transfer q ≡ |q| and the square of the four-momentum transfer q 2 µ entering Eqs. (4)-(10) are written in terms of the kinematical parameters (laboratory scattering angle θ and lepton energies ε i and 054612-3 V. TSAKSTARA AND T. S. KOSMAS PHYSICAL REVIEW C 83, 054612 (2011)

Section: -10mentioning

confidence: 88%

Low-energy neutral-current neutrino scattering onTe128,130isotopes

2011

Phys. Rev. C

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“…Neutrinos, the most abundant and least understood particles in nature, have attracted for the past few decades a quite intensive effort of the researchers working in nuclear physics, astroparticle physics, and cosmology [1][2][3][4][5][6][7][8]. Many neutrino experiments in the world (KamLAND [9], Borexino [10,11], SNO + [12], LENA [13], and other experiments) with extremely precise detectors aim to measure different types of neutrinos as well as neutrino-nucleus cross sections (β-beam neutrino experiments [14][15][16] and the ORLAND experiment [17][18][19]) to help answer key questions about neutrino properties, the evolution of distant massive stars, and how matter is synthesized [5,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, theoretically the nuclear responses of the ν detector to the energy spectra of the observed neutrino flux could be simulated by convoluted (folded) cross sections obtained by using realistic description for the ν beam of the studied neutrino source [26,[31][32][33]. In the case of the supernova (SN) neutrinos we address in this work, however, despite the fact that the actual neutrino-nucleus cross sections play a crucial role in unraveling the various SN explosion scenarios [5,20] and also in constraining the parameters of the relevant nuclear structure theory [6][7][8][34][35][36][37][38][39], cross section measurements are not available for many nuclear reactions occurring in a SN [3,5].…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, which is an extension of our recent works [6][7][8], we study extensively the nuclear response to SN neutrinos of the 64,66 Zn isotopes focusing on the computation of flux-averaged cross sections of these nuclei for various SN neutrino models. The Zn isotopes are significant materials of the semiconductor CdZnTe detector of the COBRA experiment planned to search for double-β-decay events and neutrino observations at the Laboratori Nazionali del Gran Sasso (LNGS) [4,12].…”

Section: Introductionmentioning

confidence: 99%

“…In the NC scattering we address in the present work, we adopted the assumption of the two-step process as other authors have done [46][47][48][49]. The first step of this procedure includes the theoretical cross section for neutrino excitation that may be determined within an effective model calculation as the shell model [19,36,47], the continuum random-phase approximation (CRPA) [35,52], the quasiparticle random-phase approximation (QRPA), etc., for all the possible neutrino excitations [7,8,20,39]. In the second step, a special treatment is needed to calculate the individual cross sections for each of the accessible deexcitation channels, i.e., the individual branching ratios into the various decay channels (proton, neutron, α-particle, and γ emission) by using, e.g., a statistical model like the Hauser-Feshbach model [46,47,52].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nuclear responses of64,66Zn isotopes to supernova neutrinos

2012

Phys. Rev. C

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Nuclear responses to energy spectra of supernova (SN) neutrinos are studied by folding original ν-nucleus cross sections calculated in the context of the quasiparticle random-phase approximation using realistic two-body forces. To this purpose, we employ two-parameter neutrino-energy distributions of Fermi-Dirac and power-law shapes for various SN neutrino scenarios. As concrete examples of promising neutrino detectors we have chosen the 64,66 Zn isotopes, contents of (i) the semiconductor CdZnTe (COBRA experiment) and (ii) the crystal scintillators ZnMoO 4 and ZnWO 4 . These materials are quite advantageous for measuring double-β-decay events and for potential use in studying current neutrino physics issues. We concentrate on the evaluation of folded differential cross sections, [dσ (ω)/dω] fold , and flux-averaged cumulative cross sections, [dσ (ω)/dω] cum fold , as well as total cross sections, σ tot , of the above Zn isotopes by adopting several realistic SN neutrino models parametrized by the neutrino temperature or the mean neutrino energy and the width of the aforementioned distributions.

Application of simulation techniques in supernova physics

2013

J. Phys.: Conf. Ser.

Abstract. In supernova (SN) physics, the responses of nuclear neutrino-detectors to SN neutrino-spectra, are studied by convoluting original theoretical cross sections with well known SN (anti)neutrino-energy distributions (such distributions are the two-parameter Fermi-Dirac and Power-Law distributions). Also, the interpretation of SN neutrino signals, created at various nuclear ν-detectors, is explored by applying simulation techniques in low-energy νe anti-neutrino spectra of boosted β-radioactive 6 He ions (beta-beam neutrinos). In the present paper, we employ simulation techniques to analyze original SN anti-neutrino signals by using synthetic beta-beam spectra (defined as linear combinations of boosted beta-beam spectra of 6 He). The quality of the fits, obtained by using the MERLIN optimization package, is in general good. From a nuclear theory point of view, the resulted nuclear responses reflect the effectiveness of some detector materials as SN neutrino detectors (COBRA, CUORE, ICARUS experiments).