Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 M⊙ star. Issue 6 (1st June 2020) - Zaizen, Masamichi; Cherry, John F.; Takiwaki, Tomoya; Horiuchi, Shunsaku; Kotake, Kei; Umeda, Hideyuki; Yoshida, Takashi