Solar neutrinos enable self-calibration of the ν_e + 40Ar cross section to ≲2% in 9-15 MeV via known 8B flux, survival probability, and distinctive Fermi/Gamow-Teller angular distributions.
The angular distribution of the reaction $\bar{\nu}_e + p \to e^+ + n$
7 Pith papers cite this work. Polarity classification is still indexing.
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abstract
The reaction $\bar{\nu}_e + p \to e^+ + n$ is very important for low-energy ($E_\nu \lesssim 60$ MeV) antineutrino experiments. In this paper we calculate the positron angular distribution, which at low energies is slightly backward. We show that weak magnetism and recoil corrections have a large effect on the angular distribution, making it isotropic at about 15 MeV and slightly forward at higher energies. We also show that the behavior of the cross section and the angular distribution can be well-understood analytically for $E_\nu \lesssim 60$ MeV by calculating to ${\cal O}(1/M)$, where $M$ is the nucleon mass. The correct angular distribution is useful for separating $\bar{\nu}_e + p \to e^+ + n$ events from other reactions and detector backgrounds, as well as for possible localization of the source (e.g., a supernova) direction. We comment on how similar corrections appear for the lepton angular distributions in the deuteron breakup reactions $\bar{\nu}_e + d \to e^+ + n + n$ and $\nu_e + d \to e^- + p + p$. Finally, in the reaction $\bar{\nu}_e + p \to e^+ + n$, the angular distribution of the outgoing neutrons is strongly forward-peaked, leading to a measurable separation in positron and neutron detection points, also potentially useful for rejecting backgrounds or locating the source direction.
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JUNO's initial results combined with global data give a 2.2-2.3 sigma preference for normal neutrino mass ordering.
JUNO slow-mode data mildly prefer nonzero β_M1 (hinting Majorana neutrinos), while fast-mode RG shifts from β_D and β_M3 degrade mass-ordering sensitivity that TAO can restore.
Simulations show the low-T/|W| instability develops robustly across five nuclear EOS in a rapidly rotating 35 M⊙ progenitor, with dominant GW frequency correlating to PNS compactness and stiffness.
JUNO's initial 59-day dataset constrains sterile neutrino mass splittings between 10^{-5} and 10^{-2} eV² down to sin²2θ₁₄ ~ O(10^{-1}) and scalar NSI |η_ee| below O(10^{-2}).
Pion-induced QED radiative corrections in inverse beta decay are small, at or below nucleon form factor uncertainties, enabling sub-permille theoretical precision for charged-current neutrino-nucleon scattering above 10 MeV.
Calculations indicate ton- to tens-of-kiloton inverse-beta-decay detectors can set useful fission-yield limits for chemical explosions up to 100 km at the Nevada National Security Site but are unsuitable for longer ranges or subcritical experiments.
citing papers explorer
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Self-Calibration of the Neutrino-Argon Cross Section with Solar Neutrinos
Solar neutrinos enable self-calibration of the ν_e + 40Ar cross section to ≲2% in 9-15 MeV via known 8B flux, survival probability, and distinctive Fermi/Gamow-Teller angular distributions.
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Lessons from the first JUNO results
JUNO's initial results combined with global data give a 2.2-2.3 sigma preference for normal neutrino mass ordering.
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Disentangle RG Running Parameters with Medium-Baseline Reactor Experiments
JUNO slow-mode data mildly prefer nonzero β_M1 (hinting Majorana neutrinos), while fast-mode RG shifts from β_D and β_M3 degrade mass-ordering sensitivity that TAO can restore.
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Impact of the equation of state on core collapse supernovae I: the low-$T/|W|$ instability
Simulations show the low-T/|W| instability develops robustly across five nuclear EOS in a rapidly rotating 35 M⊙ progenitor, with dominant GW frequency correlating to PNS compactness and stiffness.
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Constraints on Light Sterile Neutrinos and Scalar Non-Standard Interactions Using the First Reactor Antineutrino Oscillation Results at JUNO
JUNO's initial 59-day dataset constrains sterile neutrino mass splittings between 10^{-5} and 10^{-2} eV² down to sin²2θ₁₄ ~ O(10^{-1}) and scalar NSI |η_ee| below O(10^{-2}).
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QED radiative corrections in inverse beta decay from virtual pions
Pion-induced QED radiative corrections in inverse beta decay are small, at or below nucleon form factor uncertainties, enabling sub-permille theoretical precision for charged-current neutrino-nucleon scattering above 10 MeV.
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Neutrino monitoring of explosions for excluding fission yield
Calculations indicate ton- to tens-of-kiloton inverse-beta-decay detectors can set useful fission-yield limits for chemical explosions up to 100 km at the Nevada National Security Site but are unsuitable for longer ranges or subcritical experiments.