DETECTION OF A COSMIC-RAY WITH MEASURED ENERGY WELL BEYOND THE EXPECTED SPECTRAL CUTOFF DUE TO COSMIC MICROWAVE-RADIATION

被引：484

作者：

BIRD, DJ ^{[1
]}

CORBATO, SC ^{[1
]}

DAI, HY ^{[1
]}

ELBERT, JW ^{[1
]}

GREEN, KD ^{[1
]}

HUANG, MA ^{[1
]}

KIEDA, DB ^{[1
]}

KO, S ^{[1
]}

LARSEN, CG ^{[1
]}

LOH, EC ^{[1
]}

LUO, MZ ^{[1
]}

SALAMON, MH ^{[1
]}

SMITH, JD ^{[1
]}

SOKOLSKY, P ^{[1
]}

SOMMERS, P ^{[1
]}

TANG, KK ^{[1
]}

THOMAS, SB ^{[1
]}

机构：

[1] UNIV UTAH, DEPT PHYS, INST HIGH ENERGY ASTROPHYS, SALT LAKE CITY, UT 84112 USA

来源：

ASTROPHYSICAL JOURNAL | 1995年 / 441卷 / 01期

关键词：

COSMIC MICROWAVE BACKGROUND; COSMIC RAYS; ELEMENTARY PARTICLES; RADIATION MECHANISMS; NONTHERMAL;

D O I：

10.1086/175344

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of a 51 Joule (3.2 +/- 0.9 x 10(20) eV) cosmic ray by the Fly's Eye air shower detector in Utah. This is substantially greater than the energy of any previously reported cosmic ray. A Greisen-Zatsepin-Kuz'min cutoff of the energy spectrum (due to pion photoproduction energy losses) should occur below this energy unless the highest energy cosmic rays have traveled less than approximately 30 Mpc. The error box for the arrival direction in galactic coordinates is centered on b = 9.6-degrees, l = 163.4-degrees. The particle cascade reached a maximum size near a depth of 815 g cm-2 in the atmosphere, a depth which does not uniquely identify the type of primary particle.

引用

页码：144 / 150

页数：7

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