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Title: Production of {sup 44}Ti in neutrino-driven aspherical supernova explosions

We examine the synthesis of {sup 44}Ti in a neutrino-driven aspherical supernova (SN), focusing on reaction rates related to {sup 44}Ti and rotation of a progenitor. We have performed 2D hydrodynamic simulations of SN of a 15M{sub ⊙} progenitor, whose angular velocity is manually set to be a cylindrical distribution and have followed explosive nucleosynthesis in the ejecta. We find that the faster rates of {sup 40}Ca(α,γ){sup 44}Ti and the slower rate of {sup 44}Ti(α,p){sup 47}V lead to more massive ejection of {sup 44}Ti and {sup 56}Ni and larger ratios <{sup 44}Ti/{sup 56}Ni>. Faster rotation also results in more massive ejection of {sup 44}Ti and {sup 56}Ni. Ratios <{sup 44}Ti/{sup 56}Ni> are however independent from rotation. Large masses of {sup 44}Ti and large ratios observed in SN 1987A and Cas A (> 1O{sup −4}M{sub ⊙} and 1-2 respectively) are not realized in all the models.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Kumamoto National College of Technology, 2659-2 Suya, Goshi 861-1102 (Japan)
  2. Department of Physics, School of Sciences, Kyushu University, Fukuoka 810-8560 (Japan)
  3. National Astronomical Observatory Japan, 2-21-1, Osawa, Mitaka, Tokyo, 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22280475
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALPHA REACTIONS; ANGULAR VELOCITY; ASTROPHYSICS; CALCIUM 40 TARGET; COMPUTERIZED SIMULATION; COSMIC NEUTRINOS; COSMOLOGY; NICKEL 56; NUCLEAR REACTION KINETICS; NUCLEOSYNTHESIS; ROTATION; TITANIUM 44; TITANIUM 44 TARGET; VANADIUM 47