Lower limit on pulsar birthrate set by cosmic ray positron measurements |
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Authors: | C Grimani |
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Institution: | (1) Istituto Nazionale di Fisica Nucleare, Via Pascoli, 06 100 Perugia, Italy |
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Abstract: | A recent measurement of thee
+/(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 thee
+/(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. |
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Keywords: | |
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