Lower limit on pulsar birthrate set by cosmic ray positron measurements

被引:4
作者
Grimani, C
机构
[1] Ist. Nazionale di Fisica Nucleare, Via Pascoli
关键词
D O I
10.1007/BF00645230
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
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页码:295 / 303
页数:9
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