Nuclear Synthetic Processes in Supernova Inner Shells

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Nuclear synthetic processes taking place in the inner shells of exploding supernova are examined. Applying the m_a=8m&xdot; model by Arnett, nuclear reactions occurring during the stages of shell implosion and explosion are followed. The r-process is found to proceed in the outer shell of 1.34≲m_r/10^<33>g≳1.68, whereas an intermediate process between r- and explosive e-processes, called extended-e-process, occurs in the outer shell of 1.68≲m_r/10^<33>g≳2.5. Within these shells neutron-excess nuclides with A≳50 can be produced and the stellar-shell-integrated abundances in the region A≳80 are found to be in excellent agreement with observations. It becomes clear that the extended-e-process cannot explain the abundances of the neutron-e-process nuclides such as <50>Ti. <14>Cr, <58>Fe and <64>Ni nor the , nuclides around A=70 contrary to the previous expectation. It also appears that the r-abundance peak at around A=80 does originate from the r-process but by a mass fraction of only 0.3, the remainder being contributed from the extehded-e-process , and that almost all of the (s+r) -nuclides around A=80 may possibly be the extended~e-dominant nuclides
理論物理学刊行会の論文
1979-02-25