Supernova neutrino nucleosynthesis of the radioactive $$^{92}$$Nb observed in primitive meteorites
早川 岳人; 中村 航*; 梶野 敏貴*; 千葉 敏; 岩本 信之; Cheoun, M. K.*; Mathews, G. J.*
Hayakawa, Takehito; Nakamura, Ko*; Kajino, Toshitaka*; Chiba, Satoshi; Iwamoto, Nobuyuki; Cheoun, M. K.*; Mathews, G. J.*
Short-lived radioactivities are used as nuclearcosmochronometers for understanding the free decay time from the last nucleosynthesis episode until the time of solar system formation (SSF). $$^{92}$$Nb (half-life of 34.7 Myr) is one of a short-lived isotope existed at SSF. However, there is a controversy in that the inferred initial abundance ratios for $$^{92}$$Nb/$$^{93}$$Nb at the time of SSF cluster around two different values; one is near 10$$^{-3}$$, while the other is near 10$$^{-5}$$. Moreover, the astrophysical mechanism for the synthesis of $$^{92}$$Nb has remained an unsolved problem. Here we argue that conventional nucleosynthesis mechanisms cannot produce $$^{92}$$Nb and propose a new mechanism for the nucleosynthesis of this isotopebased upon neutrino induced reactions occurring during core-collapse supernova explosions.
使用言語 : English
掲載資料名 : Astrophysical Journal Letters
: 779
: 1
ページ数 : p.L9_1 - L9_5
発行年月 : 2013/12
出版社名 : IOP Publishing
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論文URL :
キーワード : no keyword
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広報プレスリリース : 宇宙核時計ニオブ92の起源が超新星爆発ニュートリノであることを理論的に解明; 超新星爆発から太陽系誕生まで100万~3000万年と評価
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登録番号 : AA20110551
抄録集掲載番号 : 42000705
論文投稿番号 : 14333
Accesses  (From Jun. 2, 2014)
- Accesses
分野:Astronomy & Astrophysics
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