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A measurement with high statistics of the differential energy spectrum of light elements in cosmic rays, in particular, of primary H plus He nuclei, is reported. The spectrum is presented in the energy range from $6$ to $158$ TeV per…

The accurate determination of the elemental composition of cosmic rays at high energies is expected to provide crucial clues on the origin of these particles. Previous direct measurements of composition have been limited by experiment…

Astrophysics · Physics 2011-05-23 D. B. Kieda , S. P. Swordy , S. P. Wakely

Precise measurements of the energy spectra of cosmic rays (CRs) show various kinds of features deviating from single power-laws, which give very interesting and important implications on their origin and propagation. Previous measurements…

The differential energy spectrum of cosmic rays from Cherenkov radiation measurements in EAS in the energy range of 10^15-10^20eV has been compared with an anomalous diffusion model for the particles in interstellar space having fractal…

Astrophysics · Physics 2018-08-08 S. P. Knurenko , A. A. Ivanov , A. V. Sabourov

In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties.…

Recent measurements of cosmic ray proton and helium spectra show a hardening above a few hundreds of GeV. This excess is hard to understand in the framework of the conventional models of Galactic cosmic ray production and propagation. We…

High Energy Astrophysical Phenomena · Physics 2013-10-01 Guilhem Bernard , Timur Delahaye , Yong-Yeon Keum , Wei Liu , Pierre Salati , Richard Taillet

Nickel, one of the most stable elements alongside iron, is the most abundant heavy element beyond iron in cosmic rays. With DAMPE's excellent charge resolution and broad energy range, a high-precision energy spectrum provides valuable…

High Energy Astrophysical Phenomena · Physics 2025-12-15 F. Alemanno , Q. An , P. Azzarello , F. C. T. Barbato , P. Bernardini , X. J. Bi , H. V. Boutin , I. Cagnoli , M. S. Cai , E. Casilli , J. Chang , D. Y. Chen , J. L. Chen , Z. F. Chen , Z. X. Chen , P. Coppin , M. Y. Cui , T. S. Cui , I. De Mitri , F. de Palma , A. Di Giovanni , T. K. Dong , Z. X. Dong , G. Donvito , J. L. Duan , K. K. Duan , R. R. Fan , Y. Z. Fan , F. Fang , K. Fang , C. Q. Feng , L. Feng , S. Fogliacco , J. M. Frieden , P. Fusco , M. Gao , F. Gargano , E. Ghose , K. Gong , Y. Z. Gong , D. Y. Guo , J. H. Guo , S. X. Han , Y. M. Hu , G. S. Huang , X. Y. Huang , Y. Y. Huang , M. Ionica , L. Y. Jiang , W. Jiang , Y. Z. Jiang , J. Kong , A. Kotenko , D. Kyratzis , S. J. Lei , B. Li , M. B. Li , W. L. Li , W. H. Li , X. Li , X. Q. Li , Y. M. Liang , C. M. Liu , H. Liu , J. Liu , S. B. Liu , Y. Liu , F. Loparco , M. Ma , P. X. Ma , T. Ma , X. Y. Ma , G. Marsella , M. N. Mazziotta , D. Mo , Y. Nie , X. Y. Niu , A. Parenti , W. X. Peng , X. Y. Peng , C. Perrina , E. Putti Garcia , R. Qiao , J. N. Rao , Y. Rong , A. Serpolla , R. Sarkar , P. Savina , Z. Shangguan , W. H. Shen , Z. Q. Shen , Z. T. Shen , L. Silveri , J. X. Song , H. Su , M. Su , H. R. Sun , Z. Y. Sun , A. Surdo , X. J. Teng , A. Tykhonov , G. F. Wang , J. Z. Wang , L. G. Wang , S. Wang , X. L. Wang , Y. F. Wang , D. M. Wei , J. J. Wei , Y. F. Wei , D. Wu , J. Wu , S. S. Wu , X. Wu , Z. Q. Xia , Z. Xiong , E. H. Xu , H. T. Xu , J. Xu , Z. H. Xu , Z. Z. Xu , Z. L. Xu , G. F. Xue , M. Y. Yan , H. B. Yang , P. Yang , Y. Q. Yang , H. J. Yao , Y. H. Yu , Q. Yuan , C. Yue , J. J. Zang , S. X. Zhang , W. Z. Zhang , Y. Zhang , Y. P. Zhang , Y. Zhang , Y. J. Zhang , Y. Q. Zhang , Y. L. Zhang , Z. Zhang , Z. Y. Zhang , C. Zhao , H. Y. Zhao , X. F. Zhao , C. Y. Zhou , X. Zhu , Y. Zhu

Recent data on Galactic cosmic rays (CRs) revealed that the helium energy spectrum is harder than the proton spectrum. The AMS experiment has now reported that the proton-to-helium ratio as function of rigidity $R$ (momentum-to-charge…

High Energy Astrophysical Phenomena · Physics 2015-12-04 Nicola Tomassetti

An analysis is made of the fine structure in the cosmic ray energy spectrum: new facets of present observations and their interpretation and the next step. It is argued that less than about 10% of the intensity of the helium `peak' at the…

High Energy Astrophysical Phenomena · Physics 2011-11-15 A. D. Erlykin , A. W. Wolfendale

We report the high-purity identification of cosmic-ray (CR) protons and a precise measurement of their energy spectrum from 0.15 to 12 PeV using the Large High Altitude Air Shower Observatory (LHAASO). Abundant event statistics, combined…

High Energy Astrophysical Phenomena · Physics 2025-12-29 The LHAASO Collaboration , Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , A. V. Bukevich , C. M. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , A. M. Chen , E. S. Chen , G. H. Chen , H. X. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , Y. Chen , N. Cheng , Y. D. Cheng , M. C. Chu , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , C. D. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernandez-Cadena , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , T. Q. Huang , W. J. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , B. B. Li , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Xin Li , Y. Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , P. Lipari , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , Z. Min , W. Mitthumsiri , G. B. Mou , H. J. Mu , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , P. Pattarakijwanich , Z. Y. Pei , J. C. Qi , M. Y. Qi , J. J. Qin , A. Raza , C. Y. Ren , D. Ruffolo , A. Saiz , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , V. Stepanov , Y. Su , D. X. Sun , H. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , G. W. Wang , H. G. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. L. Xin , Y. Xing , D. R. Xiong , Z. Xiong , D. L. Xu , R. F. Xu , R. X. Xu , W. L. Xu , L. Xue , D. H. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Z. H. Yang , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , X. T. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , C. Zhang , F. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , Li Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , W. J. Zhong , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

In most particle acceleration or propagation theories, the characteristic features of the cosmic ray spectra due to acceleration limits or propagation phase changes are charge dependent. Alternatively, the interaction scenario would expect…

High Energy Astrophysical Phenomena · Physics 2026-05-01 DAMPE Collaboration , Francesca Alemanno , Qi An , Philipp Azzarello , Felicia-Carla-Tiziana Barbato , Paolo Bernardini , Xiao-Jun Bi , Hugo Valentin Boutin , Irene Cagnoli , Ming-Sheng Cai , Elisabetta Casilli , Jin Chang , Deng-Yi Chen , Jun-Ling Chen , Zhan-Fang Chen , Zi-Xuan Chen , Paul Coppin , Ming-Yang Cui , Tian-Shu Cui , Ivan De Mitri , Francesco de Palma , Adriano Di Giovanni , Tie-Kuang Dong , Zhen-Xing Dong , Giacinto Donvito , Jing-Lai Duan , Kai-Kai Duan , Rui-Rui Fan , Yi-Zhong Fan , Fang Fang , Kun Fang , Chang-Qing Feng , Lei Feng , Sara Fogliacco , Jennifer-Maria Frieden , Piergiorgio Fusco , Min Gao , Fabio Gargano , Essna Ghose , Ke Gong , Yi-Zhong Gong , Dong-Ya Guo , Jian-Hua Guo , Shuang-Xue Han , Yi-Ming Hu , Guang-Shun Huang , Xiao-Yuan Huang , Yong-Yi Huang , Maria Ionica , Lu-Yao Jiang , Wei Jiang , Yao-Zu Jiang , Jie Kong , Andrii Kotenko , Dimitrios Kyratzis , Shi-Jun Lei , Bo Li , Manbing Li , Wei-Liang Li , Wen-Hao Li , Xiang Li , Xian-Qiang Li , Yao-Ming Liang , Cheng-Ming Liu , Hao Liu , Jie Liu , Shu-Bin Liu , Yang Liu , Francesco Loparco , Miao Ma , Peng-Xiong Ma , Tao Ma , Xiao-Yong Ma , Giovanni Marsella , Mario-Nicola Mazziotta , Dan Mo , Yu Nie , Xiao-Yang Niu , Andrea Parenti , Wen-Xi Peng , Xiao-Yan Peng , Chiara Perrina , Enzo Putti-Garcia , Rui Qiao , Jia-Ning Rao , Yi Rong , Andrea Serpolla , Ritabrata Sarkar , Pierpaolo Savina , Zhi Shangguan , Wei-Hua Shen , Zhao-Qiang Shen , Zhong-Tao Shen , Leandro Silveri , Jing-Xing Song , Hong Su , Meng Su , Hao-Ran Sun , Zhi-Yu Sun , Antonio Surdo , Xue-Jian Teng , Andrii Tykhonov , Gui-Fu Wang , Jin-Zhou Wang , Lian-Guo Wang , Shen Wang , Xiao-Lian Wang , Yan-Fang Wang , Da-Ming Wei , Jia-Ju Wei , Yi-Feng Wei , Di Wu , Jian Wu , Sha-Sha Wu , Xin Wu , Zi-Qing Xia , Zheng Xiong , En-Heng Xu , Hai-Tao Xu , Jing Xu , Zhi-Hui Xu , Zi-Zong Xu , Zun-Lei Xu , Guo-Feng Xue , Ming-Yu Yan , Hai-Bo Yang , Peng Yang , Ya-Qing Yang , Hui-Jun Yao , Yu-Hong Yu , Qiang Yuan , Chuan Yue , Jing-Jing Zang , Sheng-Xia Zhang , Wen-Zhang Zhang , Yan Zhang , Ya-Peng Zhang , Yi Zhang , Yong-Jie Zhang , Yong-Qiang Zhang , Yun-Long Zhang , Zhe Zhang , Zhi-Yong Zhang , Cong Zhao , Hong-Yun Zhao , Xun-Feng Zhao , Chang-Yi Zhou , Xun Zhu , Yan Zhu

ARGO-YBJ preliminary results of the measurements of the all-particle and light-component (i.e. protons and helium) cosmic ray energy spectra between approximately 5 TeV and 5 PeV are reported and discussed. The resulting all-particle…

High Energy Astrophysical Phenomena · Physics 2015-02-18 A. D'Amone , I. De Mitri , A. Surdo

Precise measurements of the boron-to-carbon and boron-to-oxygen ratios by DAMPE show clear hardenings around $100$ GeV/n, which provide important implications on the production, propagation, and interaction of Galactic cosmic rays. In this…

High Energy Astrophysical Phenomena · Physics 2023-03-07 Peng-Xiong Ma , Zhi-Hui Xu , Qiang Yuan , Xiao-Jun Bi , Yi-Zhong Fan , Igor V. Moskalenko , Chuan Yue

We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays was reliably…

The small change in the spectral slope of the overall intensity of cosmic rays near 1 PeV may be associated with the endpoint energy of supernova shock acceleration. A crucial test of this connection and other ideas of the origin of the…

Astrophysics · Physics 2011-05-23 S. P. Swordy , D. B. Kieda

Below the knee in the cosmic ray spectrum, balloon and spacecraft experiments offer the capability of direct composition and energy measurements on the primary particles. A major difficulty is obtaining enough exposure to extend the range…

Astrophysics · Physics 2009-11-13 Michael L. Cherry

The observations of the energy spectra of cosmic-ray have revealed complicated structures. Especially, spectral hardenings in the boron-to-carbon and boron-to-oxygen ratios above $\sim 200$ GV has been revealed by AMS-02 and DAMPE…

High Energy Astrophysical Phenomena · Physics 2023-07-06 Dong-Xu Sun , Pei-Pei Zhang , Yi-Qing Guo , Wei Liu , Qiang Yuan

One of the main objectives of cosmic-ray studies are precise measurements of energy and chemical composition of particles with extreme energies. Large and sophisticated detectors are used to find events seen as showers starting in the…

The study of Galactic Cosmic-ray electrons (CREs) saw important developments in recent years, with the assumption of positron production only in interaction of hadronic Cosmic-rays with interstellar matter challenged by new measurements of…

High Energy Astrophysical Phenomena · Physics 2016-10-17 Marco Tinivella

It is expected that a radio signal in the microwave range is produced in the atmosphere due to molecular bremsstrahlung initiated by extensive air showers. The CROME (Cosmic-Ray Observation via Microwave Emission) experiment was built to…