地磁俘获宇宙线反质子的发现
高能天体物理现象
2011-08-01 v1 高能物理 - 实验
摘要
若干理论工作已考虑过地球磁层中存在显著反质子通量的可能性。这些反粒子产生于高能宇宙线与地球大气的核相互作用，并积聚在数百公里高度处的地磁场中。类比中子衰变产生质子（这是能量在数十 MeV 以上的俘获质子的主要来源），已有人假设反照反中子衰变也会贡献反质子。本快报报道了地球周围反质子辐射带的发现。PAMELA 实验测量了南大西洋异常区（SAA）内动能范围 60--750 MeV 的俘获反质子能谱。同时报道了辐射带外大气亚截止反质子谱的测量结果。PAMELA 数据表明，在当前太阳活动极小期，SAA 区的磁层反质子通量超出宇宙线反质子通量三个数量级，并超出辐射带外亚截止反质子通量四个数量级，构成了地球附近最丰富的反质子源。
引用
@article{arxiv.1107.4882,
title = {The discovery of geomagnetically trapped cosmic ray antiprotons},
author = {O. Adriani and G. C. Barbarino and G. A. Bazilevskaya and R. Bellotti and M. Boezio and E. A. Bogomolov and M. Bongi and V. Bonvicini and S. Borisov and S. Bottai and A. Bruno and F. Cafagna and D. Campana and R. Carbone and P. Carlson and M. Casolino and G. Castellini and L. Consiglio and M. P. De Pascale and C. De Santis and N. De Simone and V. Di Felice and A. M. Galper and W. Gillard and L. Grishantseva and G. Jerse and A. V. Karelin and M. D. Kheymits and S. V. Koldashov and S. Y. Krutkov and A. N. Kvashnin and A. Leonov and V. Malakhov and L. Marcelli and A. G. Mayorov and W. Menn and V. V. Mikhailov and E. Mocchiutti and A. Monaco and N. Mori and N. Nikonov and G. Osteria and F. Palma and P. Papini and M. Pearce and P. Picozza and C. Pizzolotto and M. Ricci and S. B. Ricciarini and L. Rossetto and R. Sarkar and M. Simon and R. Sparvoli and P. Spillantini and Y. I. Stozhkov and A. Vacchi and E. Vannuccini and G. Vasilyev and S. A. Voronov and Y. T. Yurkin and J. Wu and G. Zampa and N. Zampa and V. G. Zverev},
journal= {arXiv preprint arXiv:1107.4882},
year = {2011}
}
备注
Accepted for publication in ApJL