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Title: Detectability of collective neutrino oscillation signatures in the supernova explosion of a 8.8 M star

Abstract

In order to investigate the impact of collective neutrino oscillations (CNOs) on the neutrino signal from a nearby supernova, we perform three-flavor neutrino oscillation simulations employing the multiangle effect. The background hydrodynamic model is based on the neutrino hydrodynamic simulation of a 8.8 M progenitor star. In this work, we find that CNO commences after some 100 ms post bounce. Before this, CNO is suppressed by matter-induced decoherence. In the inverted mass hierarchy, the spectrum of $$\bar{ν}_e$$ becomes softer after the onset of CNO. To evaluate the detectability of this modification, we define a hardness ratio between the number of high energy neutrino events and low energy neutrino events adopting a fixed critical energy. We show that Hyper-Kamiokande (HK) can distinguish the effect of CNO for supernova distances out to ~ 10 kpc. On the other hand, for the normal mass hierarchy, the spectrum of ν e becomes softer after the onset of CNO, and we show that DUNE can distinguish this feature for supernova distances out to ~ 10 kpc . More work is necessary to optimize the best value of critical energy for maximum sensitivity. We also show that if the spectrum of $$\bar{ν}_e$$ in HK becomes softer due to CNO, the spectrum of $$ν_e$$ in DUNE becomes harder, and vice versa. These synergistic observations in $$\bar{ν}_e$$ and $$ν_e$$, by HK and DUNE, respectively, will be an intriguing opportunity to test the occurrence of CNO.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of Tokyo (Japan); National Astronomical Observatory of Japan, Tokyo (Japan)
  2. National Astronomical Observatory of Japan, Tokyo (Japan)
  3. Univ. of Tokyo (Japan)
  4. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  5. Tohoku Univ., Sendai (Japan)
Publication Date:
Research Org.:
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Science Foundation (NSF)
OSTI Identifier:
1803939
Grant/Contract Number:  
SC0020262; JP17H01130; JP17K14306; JP17K17655; JP19J13632; JP18H01212; JP15H01039; JP17H06357; JP17H06364; JP17H05206; JP26104001; JP26104007; JP19H05803; 01321802; 01311904; AST-1908960; PHY-1914409
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. D.
Additional Journal Information:
Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; Physics

Citation Formats

Sasaki, Hirokazu, Takiwaki, Tomoya, Kawagoe, Shio, Horiuchi, Shunsaku, and Ishidoshiro, Koji. Detectability of collective neutrino oscillation signatures in the supernova explosion of a 8.8 M⊙ star. United States: N. p., 2020. Web. doi:10.1103/physrevd.101.063027.
Sasaki, Hirokazu, Takiwaki, Tomoya, Kawagoe, Shio, Horiuchi, Shunsaku, & Ishidoshiro, Koji. Detectability of collective neutrino oscillation signatures in the supernova explosion of a 8.8 M⊙ star. United States. https://doi.org/10.1103/physrevd.101.063027
Sasaki, Hirokazu, Takiwaki, Tomoya, Kawagoe, Shio, Horiuchi, Shunsaku, and Ishidoshiro, Koji. Thu . "Detectability of collective neutrino oscillation signatures in the supernova explosion of a 8.8 M⊙ star". United States. https://doi.org/10.1103/physrevd.101.063027. https://www.osti.gov/servlets/purl/1803939.
@article{osti_1803939,
title = {Detectability of collective neutrino oscillation signatures in the supernova explosion of a 8.8 M⊙ star},
author = {Sasaki, Hirokazu and Takiwaki, Tomoya and Kawagoe, Shio and Horiuchi, Shunsaku and Ishidoshiro, Koji},
abstractNote = {In order to investigate the impact of collective neutrino oscillations (CNOs) on the neutrino signal from a nearby supernova, we perform three-flavor neutrino oscillation simulations employing the multiangle effect. The background hydrodynamic model is based on the neutrino hydrodynamic simulation of a 8.8 M⊙ progenitor star. In this work, we find that CNO commences after some 100 ms post bounce. Before this, CNO is suppressed by matter-induced decoherence. In the inverted mass hierarchy, the spectrum of $\bar{ν}_e$ becomes softer after the onset of CNO. To evaluate the detectability of this modification, we define a hardness ratio between the number of high energy neutrino events and low energy neutrino events adopting a fixed critical energy. We show that Hyper-Kamiokande (HK) can distinguish the effect of CNO for supernova distances out to ~ 10 kpc. On the other hand, for the normal mass hierarchy, the spectrum of ν e becomes softer after the onset of CNO, and we show that DUNE can distinguish this feature for supernova distances out to ~ 10 kpc . More work is necessary to optimize the best value of critical energy for maximum sensitivity. We also show that if the spectrum of $\bar{ν}_e$ in HK becomes softer due to CNO, the spectrum of $ν_e$ in DUNE becomes harder, and vice versa. These synergistic observations in $\bar{ν}_e$ and $ν_e$, by HK and DUNE, respectively, will be an intriguing opportunity to test the occurrence of CNO.},
doi = {10.1103/physrevd.101.063027},
journal = {Physical Review. D.},
number = 6,
volume = 101,
place = {United States},
year = {Thu Mar 26 00:00:00 EDT 2020},
month = {Thu Mar 26 00:00:00 EDT 2020}
}

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