Energy spectrum of primary cosmic rays above 1017.0 eV determined from extensive air shower experiments at Akeno
Energy spectrum of primary cosmic rays above 1017.0 eV determined from extensive air shower experiments at Akeno
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DOI：
10.1088/0954-3899/18/2/022
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发表时间：
1992-02
期刊：
影响因子：
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通讯作者：
M. Nagano;M. Teshima;Y. Matsubara;H. Dai;T. Hara;N. Hayashida;M. Honda;H. Ohoka;S. Yoshida
中科院分区：
文献类型：
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作者：
M. Nagano;M. Teshima;Y. Matsubara;H. Dai;T. Hara;N. Hayashida;M. Honda;H. Ohoka;S. Yoshida
1017.0 eV以上的初级宇宙射线能谱已根据在秋野运行的两个广泛的空气淋浴阵列收集的数据进行了更新，一个面积为1平方公里，另一个面积为20平方公里。加上作者之前在较低能量区域的结果，已经确定了大约50年的能量从1014.5 eV到1019.8 eV的能谱。幂律能谱指数在1017.8 eV左右发生变化，膝关节在1015.7 eV左右，踝关节在1019.0 eV左右。微分幂律能谱指标为：1015.7 eV以下为（2.62+or-0.12）， 1015.7 eV附近为（3.02+or-0.03）， 1017.8 eV附近为（3.16+or-0.08）。有迹象表明，光谱在大约1018.8 eV以上变得平坦，指数为（2.8+or-0.3）。1018 eV以上的通量为（1.5约2.4）*10-12 m-2s-1sr-1，与其他实验结果吻合较好。1019.5 eV以上的阵雨数为7个，暴露量为80平方公里/年，新的秋野巨型空气阵雨阵列（AGASA）已经开始运行，需要进一步调查，以确定光谱中的截止能量，如果有的话。
The energy spectrum of primary cosmic rays above 1017.0 eV has been updated from data collected with two extensive air shower arrays operating at Akeno, one with area 1 km2 and the other with area 20 km2. Along with the authors previous results in the lower energy region, the energy spectrum has been determined over about five decades of energy from 1014.5 eV to 1019.8 eV. A change in the index of the power-law energy spectrum is observed around 1017.8 eV, as well as the usual features, namely the knee around 1015.7 eV and the ankle around 1019.0 eV. The indices of the differential power-law energy spectrum are: (2.62+or-0.12) below 1015.7 eV, (3.02+or-0.03) for 1015.7 approximately 1017.8 eV and (3.16+or-0.08) for 1017.8 approximately 1018.8 eV. There is an indication of a flattening of the spectrum above approximately 1018.8 eV with an index of (2.8+or-0.3). The flux above 1018 eV is (1.5 approximately 2.4)*10-12 m-2s-1sr-1 and is in good agreement with other experiments. The number of showers above 1019.5 eV is seven for an exposure of 80 km2 yr sr and further investigation by a new Akeno giant air shower array (AGASA), whose operation has started, is necessary to determine a cutoff energy in the spectrum, if any.