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Prog. Theor. Phys. Vol. 51 No. 3 (1974) pp. 726-744

[ Full Text PDF : FREE ACCESS (1426K) ]

Formation of Elements in Neutron Rich Ejected Matter of Supernovae. II

— Dynamical r-Process Stage —

Katsuhiko Sato

Department of Physics, Kyoto University, Kyoto

(Received July 28, 1973)

Abstract:

Thermal and chemical properties of neutron-rich matter ejected by supernova explosion are investigated along the line of a previous work of the author. In this investigation, the dynamical r-process is worked out for the first time by taking into account a thermodynamical equation. Computations are carried out for a number of sets of expansion speeds and initial n/p ratios at high temperature, and for two extreme cases on fission cutoff, i.e., the pessimistic and optimistic cases on the synthesis of superheavy nuclei.
By this investigation the following results are obtained.
1) The energy release accompanied with beta decays and fissions is indispensable in reproducing the observed abundance of the r-process elements.
2) The abundance of the r-process products is almost independent of the initial n/p ratio, but depends on the expansion speed of the supernova. To reproduce the r-process peaks of observed abundances the expansion speed of supernova should be greater than the free fall speed but smaller than thirty times the free fall speed.


URL : http://ptp.ipap.jp/link?PTP/51/726/
DOI : 10.1143/PTP.51.726

[ Full Text PDF : FREE ACCESS (1426K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 54 No. 5 (1975) pp. 1325-1338 :
    Supernova Explosion and Neutral Currents of Weak Interaction
    Katsuhiko Sato
  2. Progress of Theoretical Physics Vol. 61 No. 2 (1979) pp. 452-465 :
    Nuclear Synthetic Processes in Supernova Inner Shells
    Teruaki Ohnishi
  3. Progress of Theoretical Physics Vol. 62 No. 4 (1979) pp. 957-968 :
    Nuclear Compositions in the Inner Crust of Neutron Stars
    Katsuhiko Sato
  4. Progress of Theoretical Physics Supplement No.146 (2002) pp. 258-267 :
    r-Process Nucleosynthesis in Supernova Explosions
    Kohsuke Sumiyoshi

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