Sprecher
Beschreibung
The first detection of supernova burst neutrinos was achieved through the observation
of SN1987A [1], almost four decades ago. However, neutrinos produced during the
burning stages of a massive star prior to core collapse are yet to be detected. In
particular, neutrinos from the silicon core and shell burning phases, with typical
energies of a few MeV [2], may be detectable with current and next generation neutrino
detectors [3]. Integrating pre-supernova models into a neutrino event generator would
help to provide a unified framework for studying this source of neutrinos.
sntools [4] is a neutrino event generator for supernova burst neutrinos, originally
developed to study supernova model discrimination with Hyper-Kamiokande [5]. It
currently supports a range of detector geometries, detection materials, input formats
for neutrino fluxes generated from computer simulations and can use any core collapse
supernova model implemented within the Python package SNEWPY [6]. The output file
produced can be directly fed into detector simulation software to simulate the detector
response to these interactions.
In this talk, I will begin by introducing pre-supernova neutrinos and the importance of
their detection. Following this, I will describe work to add support for pre-supernova
event generation to sntools, emphasizing how time binning can be optimised for a
robust simulation. Finally, I will present the progress I have made towards using sntools
to generate the signal MC for a pre-supernova neutrino sensitivity study for the Hyper
Kamiokande Experiment, outlining the current status and future plans for the work.
[1] K. Hirata et al., “Observation of a neutrino burst from the supernova SN1987a,” Physical Review
Letters, vol. 58, no. 14, pp. 1490–1493, Apr. 6, 1987. doi: 10.1103/PhysRevLett.58.1490.
[2] C. Kato, K. Ishidoshiro, and T. Yoshida, “Theoretical prediction of presupernova neutrinos and their
detection,” Annual Review of Nuclear and Particle Science, vol. 70, pp. 121–145, Volume 70, 2020 Oct. 19,
2020, issn: 0163-8998, 1545-4134. doi: 10.1146/annurev-nucl-040620-021320.
[3] A. Odrzywolek, M. Misiaszek, and M. Kutschera, “Detection possibility of the pair annihilation
neutrinos from the neutrino-cooled pre-supernova star,” Astroparticle Physics, vol. 21, no. 3, pp. 303
313, Jun. 1, 2004, issn: 0927-6505. doi: 10.1016/ j.astropartphys.2004.02.002.
[4] J. Migenda et al., “Sntools: An event generator for supernova burst neutrinos,” Journal of Open Source
Software, vol. 6, no. 60, p. 2877, Apr. 15, 2021, issn: 2475 9066. doi: 10.21105/joss.02877
[5] K. Abe et al., “Supernova model discrimination with hyper-kamiokande,” The Astrophysical Journal,
vol. 916, no. 1, p. 15, Jul. 2021, issn: 0004-637X. doi: 10.3847/1538-4357/abf7c4.
[6] A. Baxter et al., “SNEWPY: A data pipeline from supernova simulations to neutrino signals,” Journal of
Open Source Software, vol. 6, no. 67, p. 3772, Nov. 27, 2021, issn: 2475-9066. doi: 10.21105/joss.03772.