Lower Limit on Pulsar Birthrate Set by Cosmic Ray Positron Measurements
Author: Grimani, C.
Source: Astrophysics and Space Science, Volume 241, Number 2, 1996 , pp. 295-303(9)
Abstract:A recent measurement of the e+/(e+ + e-) ratio in cosmic rays between 5 and 50 GeV (HEAT experiment), is consistent with positron production theories via primary cosmic radiation interactions in the interstellar medium. This paper will show that atmospheric corrections result in a 50% level of uncertainty in the e+/(e+ + e-) ratio measurements carried out with balloon-borne experiments. In light of the current theories on electron-positron production in neutron stars and by using different calculations for atmospheric corrections, a lower limit on Milky Way pulsar birthrate of 30–60 years can be set on the basis of recent observations of the positron fraction in cosmic rays.
Document Type: Regular Paper
Affiliations: Istituto Nazionale di Fisica Nucleare, Via Pascoli, 06100 Perugia, Italy
Publication date: 1996