Abstract
In this paper it is discussed a prediction upon the mass composition of Cosmic Rays in the PeV region, deduced from a self consistent model of acceleratio in early SN remnants. In this model the knee in the calorimetric “all particle” spectrum is due to a transition of the acceleration site, from the outer region of the remnants, to the inner plerionic region created by a powerfull pulsar, which quite naturally, takes place around 1 PeV. We observe that the mass composition versus energy distribution of the CR captured at the Earth, in this model, should be drastically affected by this transition, showing an increase of the heavy component while approching the knee and a rather sharp transition to an almost complete A=1 composition above it, due to the photodissociation of the accelerated nuclei with synchrotron photons in the plerion.
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Auriemma, G. (1990). The Mass Spectrum of Ultra High Energy Cosmic Rays. In: Brinkmann, W., Fabian, A.C., Giovannelli, F. (eds) Physical Processes in Hot Cosmic Plasmas. NATO ASI Series, vol 305. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0545-0_18
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DOI: https://doi.org/10.1007/978-94-009-0545-0_18
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