NEUTRINO-INDUCED NEUTRAL-CURRENT REACTION CROSS SECTIONS FOR r-PROCESS NUCLEI

Langanke, K.; Kolbe, E.

doi:10.1006/adnd.2002.0883

Cited by 19 publications

(9 citation statements)

References 10 publications

(9 reference statements)

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“…For the isospin-lowering operator, we use the convention t − n = p. Finally, (g A /g V ) = −1.2701 (25) is the ratio of weak axial and vector coupling constants. For first-forbidden (FF) transitions, the shape factor is…”

Section: Shell Model and β-Decay Theorymentioning

confidence: 99%

“…The weak axial coupling constant is g A = −1.2701 (25) and M is the nucleon mass. The quantity I (1, 1, 1, 1, r) appearing in the primed matrix elements takes into account the nuclear charge distribution, which can be approximated by a uniform spherical distribution [35]:…”

Section: Shell Model and β-Decay Theorymentioning

confidence: 99%

“…Traditionally, these reactions have been studied within the random phase approximation [22,23], including nuclei relevant to r-process nucleosynthesis [24][25][26]. In an interesting recent development, neutrino-induced reactions on light nuclei with relevance to neutrino nucleosynthesis [27,28] have been calculated on the basis of the shell model, including GT and first-forbidden transitions [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Shell-model half-lives including first-forbidden contributions forr-process waiting-point nuclei

et al. 2013

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We have performed large-scale shell-model calculations of the half-lives and neutron-branching probabilities of the r-process waiting-point nuclei at the magic neutron numbers N = 50, 82, and 126. The calculations include contributions from allowed Gamow-Teller and first-forbidden transitions. We find good agreement with the measured half-lives for the N = 50 nuclei with charge numbers Z = 28-32 and for the N = 82 nuclei 129 Ag and 130 Cd. The contribution of forbidden transitions reduce the half-lives of the N = 126 waiting-point nuclei significantly, while they have only a small effect on the half-lives of the N = 50 and 82 r-process nuclei.

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Section: Shell Model and β-Decay Theorymentioning

confidence: 99%

Section: Shell Model and β-Decay Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shell-model half-lives including first-forbidden contributions forr-process waiting-point nuclei

et al. 2013

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“…Due to consider-able progress in the shell model Hamiltonians, a number of neutrino-induced reactions have been described, also including various decay channels [21][22][23][24][25][26]. Random phase approximation (RPA) based on Landau-Migdal force has been employed in calculations of neutrino-induced reaction rates for r-process nuclei, including those in the neutral channel [27,28]. The hybrid model combines the shell model for allowed transitions, with the RPA to account for the forbidden transitions, allowing systematic calculations for a large number of target nuclei [7,25,29,30].…”

Section: Introductionmentioning

confidence: 99%

Neutral-current neutrino-nucleus cross sections based on relativistic nuclear energy density functional

Đapo

Paar

2012

Phys. Rev. C

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Background: Inelastic neutrino-nucleus scattering through the weak neutral-current plays important role in stellar environment where transport of neutrinos determine the rate of cooling. Since there are no direct experimental data on neutral-current neutrino-nucleus cross sections available, only the modeling of these reactions provides the relevant input for supernova simulations. Purpose: To establish fully self-consistent framework for neutral-current neutrino-nucleus reactions based on relativistic nuclear energy density functional. Methods: Neutrino-nucleus cross sections are calculated using weak Hamiltonian and nuclear properties of initial and excited states are obtained with relativistic Hartree-Bogoliubov model and relativistic quasiparticle random phase approximation that is extended to include pion contributions for unnatural parity transitions. Results: Inelastic neutral-current neutrino-nucleus cross sections for 12 C, 16 O, 56 Fe, 56 Ni, and even isotopes 92−100 Mo as well as respective cross sections averaged over distribution of supernova neutrinos. Conclusions: The present study provides insight into neutrino-nucleus scattering cross sections in the neutral channel, their theoretical uncertainty in view of recently developed microscopic models, and paves the way for systematic self-consistent large-scale calculations involving open-shell target nuclei.PACS numbers: 25.30.Pt, 21.60.Jz, 26.50.+x, 21.30.Fe, 23.40.Bw * haris@akdeniz.edu.tr † npaar@phy.hr; http://www.phy.pmf.unizg.hr/~npaar * + J≥1(1 − (ν ·q)(β ·q)) | J f ||T M AG

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“…Απόκριση ισοτόπων 128,130 Te στα μπορούν να ληφθούν υπόψει, από μία τροποποιημένη στην κατεύθυνση αυτή ενεργειακή κατανομή SN-νετρίνων [71,127,140] Για την επίτευξη καλλίτερης προσαρμογής, ένας αριθμός παραμέτρων μπορεί να εισαχθεί ο οποίος να διακρίνει μεταξύ των διαφόρων διαδικασιών αποδιέγερσης. Τέτοιοι υπολογισμοί έχουν γίνει πρόσφατα από άλλους ερευνητές [249,252] και δείχνουν ότι, ειδικότερα η θεώρηση εκπομπής ενός και δύο (αλλά και περισσοτέρων μέχρι πέντε [249]) νουκλεονίων, μας παρέχει έναν μάλλον αξιόπιστο τρόπο εξαγωγής πληροφοριών σχετικών με την ενέργεια των σουπερνόβα νετρίνων.…”

Section: συνέλιξη της διπλής διαφορικής ενεργού διατομής D 2 σ/Dθdωunclassified

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-INDUCED NEUTRAL-CURRENT REACTION CROSS SECTIONS FOR r-PROCESS NUCLEI

Cited by 19 publications

References 10 publications

Shell-model half-lives including first-forbidden contributions forr-process waiting-point nuclei

Shell-model half-lives including first-forbidden contributions forr-process waiting-point nuclei

Neutral-current neutrino-nucleus cross sections based on relativistic nuclear energy density functional

Μελέτη Αστροφυσικών Νετρίνων Με Τεχνικές Προσομοίωσης Και Υπολογισμούς Πυρηνικής Δομής

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