Possible sources of 53Mn in the early Solar System.

Details Possible sources of 53Mn in the early Solar System. Possible sources of 53Mn in the early Solar System.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sosyr..29..298u&link_type=abstract

Solar System Research, Vol. 29, No. 4, p. 298 - 308

Computer Science

2

Presolar Nebula: Manganese, Presolar Nebula: Chromium, Presolar Nebula: Nucleosynthesis, Solar System: Nucleosynthesis

Scientific paper

The production of 53Mn by energetic particles accelerated by shock waves in the epoch of the Solar System's formation is considered. Calculations are made for a model of generation of this isotope in the gaseous phase of a molecular cloud with its subsequent capture by minerals in the process of condensation and for a model of direct production of 53Mn in some high-temperature minerals of a possible dust component of the protosolar cloud. Comparison of calculated ratios 53Mn/55Mn with the observed anomalies of 53Cr*/52Cr in meteorites shows that the extinct 53Mn could actually be produced through this mechanism. The energy spectrum of particles could change in condensation reservoirs of different minerals in the exponent range γ ≡ 1.2 - 4.2. As shock waves accompany many processes in the Galaxy, one can assume that isotope production by fast particles, with their spectrum growing harder, is a universal mechanism of nucleosynthesis, supplementing nuclear fusion processes in stars. In particular, only this second source of nucleosynthesis can explain the absence of observable genetic correlations in meteorites of such isotopes that, like chromium and manganese, are generated in nuclear statistical equilibrium at late stages of presupernova evolution. The nature and value of each particular isotopic anomaly are determined by the survival ability of the isotopes and by the chances of a given mineral to conserve them in extreme PT-conditions of the early Solar System.

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