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Title: Supernova Neutral Current Signal in 40Ar

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/LANL
OSTI Identifier:
1136934
Report Number(s):
LA-UR-14-25081
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: CAPTAIN Collaboration Meeting ; 2014-07-08 - 2014-07-09 ; Santa Fe, New Mexico, United States
Country of Publication:
United States
Language:
English
Subject:
Nuclear Physics & Radiation Physics(73); Physics of Elementary Particles & Fields(72); Atomic and Nuclear Physics; Astronomy and Astrophysics; Neutrino cross section

Citation Formats

Hayes-Sterbenz, Anna C., Ibeling, Duligur, and Friar, James Lewis. Supernova Neutral Current Signal in 40Ar. United States: N. p., 2014. Web.
Hayes-Sterbenz, Anna C., Ibeling, Duligur, & Friar, James Lewis. Supernova Neutral Current Signal in 40Ar. United States.
Hayes-Sterbenz, Anna C., Ibeling, Duligur, and Friar, James Lewis. Wed . "Supernova Neutral Current Signal in 40Ar". United States. doi:. https://www.osti.gov/servlets/purl/1136934.
@article{osti_1136934,
title = {Supernova Neutral Current Signal in 40Ar},
author = {Hayes-Sterbenz, Anna C. and Ibeling, Duligur and Friar, James Lewis},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 09 00:00:00 EDT 2014},
month = {Wed Jul 09 00:00:00 EDT 2014}
}

Conference:
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  • The neutrino mass hierarchy is one of the neutrino fundamental properties yet to be determined. We introduce a method to determine neutrino mass hierarchy by comparing the interaction rate of neutral current (NC) interactions, ν(ν-bar)+p→ν(ν-bar)+p, and inverse beta decays (IBD), ν-bar{sub e}+p→n+e{sup +}, of supernova neutrinos in scintillation detectors. Neutrino flavor conversions inside the supernova are sensitive to neutrino mass hierarchy. Due to Mikheyev-Smirnov-Wolfenstein effects, the full swapping of ν-bar{sub e} flux with the ν-bar{sub x} (x=μ, τ) one occurs in the inverted hierarchy, while such a swapping does not occur in the normal hierarchy. As a result, more highmore » energy IBD events occur in the detector for the inverted hierarchy than the high energy IBD events in the normal hierarchy. By comparing IBD interaction rate with the mass hierarchy independent NC interaction rate, one can determine the neutrino mass hierarchy.« less
  • Since 1974 the neutrino processes mediated by neutral currents have been part of supernova (SN) modeling calculations. In this report only present day SN calculations will be discussed.
  • Since 1974 the neutrino processes mediated by neutral currents have been a part of supernova (SN) modeling calculations. In this report only present day SN calculations will be discussed. First I will give brief description of the SN computer model and an outline of the explosion process as depicted by that model. Then I will discuss the role weak neutral current (WNC) processes play in this explosion process. Finally, I will discus inelastic scattering of tau neutrinos by heavy elements in WNC or Earth as a mechanism for measuring the mass of tau neutrino.
  • We calculate the cross sections for the neutral-current disintegration of deuterium by neutrinos and antineutrinos: ..nu..+d..--> nu..'+n+p and nu-bar+d..-->..nu-bar'+n+p. We put special emphasis on estimates of the theoretical uncertainties of these cross sections. For /sup 8/B and hep solar neutrinos, the averaged cross sections are = 4.1(1 +- 0.1) x 10/sup -43/ cm/sup 2/ and = 1.15(1 +- 0.1) x 10/sup -42/ cm/sup 2/, respectively, where hep denotes /sup 3/He+p. The cross-section uncertainty is negligible, +- 1/2%, for the ratio of neutral-current to charged-current events. Independent of neutrino oscillations, the cross sections correspond to 4.5(1 +- 0.38) x 10/sup 3/more » solar-neutrino events per year in the proposed one-kiloton Sudbury Neutrino Observatory if the standard solar model is correct. For a galactic supernova, the total number of neutral-current events expected in the Sudbury detector is about 10/sup 3/ (distance/8 kpc)/sup -2/; most of the signal is expected to arise from ..mu.. and tau neutrinos and antineutrinos. If either ..mu.. or tau neutrinos have a mass greater than 2 x 10/sup 2/ eV, then this mass should be measurable using the neutrino signal from a galactic supernova.« less
  • We discuss how proposed supernova neutrino detectors could measure masses for [nu][sub [mu]] or [nu][sub [tau]] neutrinos in the range of 15 to 50 eV. The range for measurable masses might be extended down to 5 eV, depending on our confidence in some of the predicted features of the supernova-neutrino-burst signal. We discuss the expected characteristics of supernova neutrino signals in proposed neutral-current-based detectors.