Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Nuclear Astrophysics III

HK 34.6: Talk

Wednesday, February 28, 2018, 15:30–15:45, HZO 100

Pre-supernova neutrino signal as a probe of neutrino mass hierarchy — •Gang Guo¹ and Yong-Zhong Qian² — ¹GSI, Darmstadt, Germany — ²School of Physics and Astronomy, University of Minnesota, USA

Pre-supernova neutrinos provide an important probe of stellar interior as well as properties of neutrino. In this work, we investigate the possibility of using pre-supernova ν_e signals at JUNO to probe neutrino mass hierarchy. We find for the 4 given stellar models, i.e., 12, 15, 20 and 25 M_⊙, if the progenitor and distance can be well measured, neutrino mass hierarchy can be determined at 5σ (3σ) C. L. for stars within about 0.25−0.75 (0.4−1.1) kpc. Take Betelgeuse as a realistic case, we find the normal hierarchy case can be distinguished at 5σ C. L. via pre-supernova neutrino signals, even both the progenitor and/or the distance of Betelgeuse are not well determined.