Related papers: Discrepant hardening observed in cosmic-ray elemen…

Cosmic Ray Helium Hardening

Recent observations by CREAM and ATIC-2 experiments suggest that (1) the spectrum of cosmic ray (CR) helium is harder than that of CR proton below the knee 10^15 eV and (2) all CR spectra become hard at > 10^11 eV/n. We propose a new…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Yutaka Ohira , Kunihito Ioka

Charged Cosmic Rays: a Review of Balloon and Space Borne Measurements

Current experimental data on cosmic-ray charged leptons are briefly reviewed including measurements of the positron fraction, electron and positron spectra and inclusive electron+positron data. Precision measurements by PAMELA and AMS-02 of…

High Energy Astrophysical Phenomena · Physics 2017-04-04 Pier Simone Marrocchesi

Inferred cosmic-ray spectrum from ${\it Fermi}$-LAT $\gamma$-ray observations of the Earth's limb

Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a…

High Energy Astrophysical Phenomena · Physics 2014-03-24 LAT Collaboration , M. Ackermann , M. Ajello , A. Albert , A. Allafort , L. Baldini , G. Barbiellini , D. Bastieri , K. Bechtol , R. Bellazzini , R. D. Blandford , E. D. Bloom , E. Bonamente , E. Bottacini , A. Bouvier , T. J. Brandt , M. Brigida , P. Bruel , R. Buehler , S. Buson , G. A. Caliandro , R. A. Cameron , P. A. Caraveo , C. Cecchi , E. Charles , R. C. G. Chaves , A. Chekhtman , J. Chiang , G. Chiaro , S. Ciprini , R. Claus , J. Cohen-Tanugi , J. Conrad , S. Cutini , M. Dalton , F. D'Ammando , A. de Angelis , F. de Palma , C. D. Dermer , S. W. Digel , L. Di Venere , E. do Couto e Silva , P. S. Drell , A. Drlica-Wagner , C. Favuzzi , S. J. Fegan , E. C. Ferrara , W. B. Focke , A. Franckowiak , Y. Fukazawa , S. Funk , P. Fusco , F. Gargano , D. Gasparrini , S. Germani , N. Giglietto , F. Giordano , M. Giroletti , T. Glanzman , G. Godfrey , G. A. Gomez-Vargas , I. A. Grenier , J. E. Grove , S. Guiriec , M. Gustafsson , D. Hadasch , Y. Hanabata , A. K. Harding , M. Hayashida , K. Hayashi , J. W. Hewitt , D. Horan , X. Hou , R. E. Hughes , Y. Inoue , M. S. Jackson , T. Jogler , G. Jóhannesson , A. S. Johnson , T. Kamae , T. Kawano , J. Knödlseder , M. Kuss , J. Lande , S. Larsson , L. Latronico , F. Longo , F. Loparco , M. N. Lovellette , P. Lubrano , M. Mayer , M. N. Mazziotta , J. E. McEnery , J. Mehault , P. F. Michelson , W. Mitthumsiri , T. Mizuno , A. A. Moiseev , C. Monte , M. E. Monzani , A. Morselli , I. V. Moskalenko , S. Murgia , R. Nemmen , E. Nuss , T. Ohsugi , A. Okumura , M. Orienti , E. Orlando , J. F. Ormes , D. Paneque , J. H. Panetta , J. S. Perkins , M. Pesce-Rollins , F. Piron , G. Pivato , T. A. Porter , S. Rainò , R. Rando , M. Razzano , S. Razzaque , A. Reimer , O. Reimer , S. Ritz , M. Roth , M. Schaal , A. Schulz , C. Sgrò , E. J. Siskind , G. Spandre , P. Spinelli , A. W. Strong , H. Takahashi , Y. Takeuchi , J. G. Thayer , J. B. Thayer , D. J. Thompson , L. Tibaldo , M. Tinivella , D. F. Torres , G. Tosti , E. Troja , V. Tronconi , T. L. Usher , J. Vandenbroucke , V. Vasileiou , G. Vianello , V. Vitale , M. Werner , B. L. Winer , K. S. Wood , M. Wood , Z. Yang

Anomalous Galactic Cosmic Rays in the Framework of AMS-02

The cosmic ray energy spectra of protons and helium nuclei, which are the most abundant components of cosmic radiation, exhibit a remarkable hardening at energies above one hundred GeV/nucleon. Recent data from AMS-02 confirms this feature…

High Energy Astrophysical Phenomena · Physics 2017-02-08 Behrouz Khiali , Sadakazu Haino , Jie Feng

Observation of a spectral hardening in cosmic ray boron spectrum with the DAMPE space mission

Secondary cosmic ray fluxes are important probes of the propagation and interaction of high-energy particles in the Galaxy. Recent measurements of primary and secondary cosmic ray nuclei have revealed unexpected spectral features that…

High Energy Astrophysical Phenomena · Physics 2024-12-19 DAMPE Collaboration , F. Alemanno , C. Altomare , Q. An , P. Azzarello , F. C. T. Barbato , P. Bernardini , X. J. Bi , H. Boutin , I. Cagnoli , M. S. Cai , E. Casilli , E. Catanzani , J. Chang , D. Y. Chen , J. L. Chen , Z. F. Chen , Z. X. Chen , P. Coppin , M. Y. Cui , T. S. Cui , Y. X. Cui , I. De Mitri , F. de Palma , A. Di Giovanni , T. K. Dong , Z. X. Dong , G. Donvito , D. Droz , J. L. Duan , K. K. Duan , R. R. Fan , Y. Z. Fan , F. Fang , K. Fang , C. Q. Feng , L. Feng , 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 , Y. Z. Jiang , W. Jiang , J. Kong , A. Kotenko , D. Kyratzis , S. J. Lei , W. H. Li , W. L. 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 , X. Y. Niu , A. Parenti , W. X. Peng , X. Y. Peng , C. Perrina , E. Putti-Garcia , R. Qiao , J. N. Rao , R. Sarkar , P. Savina , A. Serpolla , Z. Shangguan , W. H. Shen , Z. Q. Shen , Z. T. Shen , L. Silveri , J. X. Song , M. Stolpovskiy , H. Su , M. Su , H. R. Sun , Z. Y. Sun , A. Surdo , X. J. Teng , A. Tykhonov , J. Z. Wang , L. G. Wang , S. Wang , X. L. Wang , Y. F. Wang , Y. Wang , D. M. Wei , J. J. Wei , Y. F. Wei , D. Wu , J. Wu , S. S. Wu , X. Wu , Z. Q. Xia , E. H. Xu , H. T. Xu , J. Xu , Z. H. Xu , Z. L. Xu , Z. Z. Xu , G. F. Xue , 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 , Yan Zhang , Yi Zhang , Y. J. Zhang , Y. L. Zhang , Y. P. Zhang , Y. Q. Zhang , Z. Zhang , Z. Y. Zhang , C. Zhao , H. Y. Zhao , X. F. Zhao , C. Y. Zhou , Y. Zhu

Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported.…

High Energy Astrophysical Phenomena · Physics 2022-09-07 O. Adriani , Y. Akaike , K. Asano , Y. Asaoka , E. Berti , G. Bigongiari , W. R. Binns , M. Bongi , P. Brogi , A. Bruno , J. H. Buckley , N. Cannady , G. Castellini , C. Checchia , M. L. Cherry , G. Collazuol , K. Ebisawa , A. W. Ficklin , H. Fuke , S. Gonzi , T. G. Guzik , T. Hams , K. Hibino , M. Ichimura , K. Ioka , W. Ishizaki , M. H. Israel , K. Kasahara , J. Kataoka , R. Kataoka , Y. Katayose , C. Kato , N. Kawanaka , Y. Kawakubo , K. Kobayashi , K. Kohri , H. S. Krawczynski , J. F. Krizmanic , P. Maestro , P. S. Marrocchesi , A. M. Messineo , J. W. Mitchell , S. Miyake , A. A. Moiseev , M. Mori , N. Mori , H. M. Motz , K. Munakata , S. Nakahira , J. Nishimura , G. A. de Nolfo , S. Okuno , J. F. Ormes , S. Ozawa , L. Pacini , P. Papini , B. F. Rauch , S. B. Ricciarini , K. Sakai , T. Sakamoto , M. Sasaki , Y. Shimizu , A. Shiomi , P. Spillantini , F. Stolzi , S. Sugita , A. Sulaj , M. Takita , T. Tamura , T. Terasawa , S. Torii , Y. Tsunesada , Y. Uchihori , E. Vannuccini , J. P. Wefel , K. Yamaoka , S. Yanagita , A. Yoshida , K. Yoshida , W. V. Zober

The Cosmic-Ray Proton and Helium Spectra measured with the CAPRICE98 balloon experiment

A new measurement of the primary cosmic-ray proton and helium fluxes from 3 to 350 GeV was carried out by the balloon-borne CAPRICE experiment in 1998. This experimental setup combines different detector techniques and has excellent…

Astrophysics · Physics 2009-11-07 M. Boezio , V. Bonvicini , P. Schiavon , A. Vacchi , N. Zampa , D. Bergstroem , P. Carlson , T. Francke , P. Hansen , E. Mocchiutti , M. Suffert , M. Hof , J. Kremer , W. Menn , M. Simon , M. Ambriola , R. Bellotti , F. Cafagna , F. Ciacio , M. Circella , C. N. De Marzo , N. Finetti , P. Papini , S. Piccardi , P. Spillantini , E. Vannuccini , S. Bartalucci , M. Ricci , M. Casolino , M. P. De Pascale , A. Morselli , P. Picozza , R. Sparvoli , J. W. Mitchell , J. F. Ormes , S. A. Stephens , R. E. Streitmatter , U. Bravar , S. J. Stochaj

High-energy electron observations by PPB-BETS flight in Antarctica

We have observed cosmic-ray electrons from 10 GeV to 800 GeV by a long duration balloon flight using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an average altitude of 35 km in January 2004. The…

Astrophysics · Physics 2008-09-05 S. Torii , T. Yamagami , T. Tamura , K. Yoshida , H. Kitamura , K. Anraku , J. Chang , M. Ejiri , I. Iijima , A. Kadokura , K. Kasahara , Y. Katayose , T. Kobayashi , Y. Komori , Y. Matsuzaka , K. Mizutani , H. Murakami , M. Namiki , J. Nishimura , S. Ohta , Y. Saito , M. Shibata , N. Tateyama , H. Yamagishi , T. Yamashita , T. Yuda

Detection of spectral hardenings in cosmic-ray boron-to-carbon and boron-to-oxygen flux ratios with DAMPE

Boron nuclei in cosmic rays (CRs) are believed to be mainly produced by the fragmentation of heavier nuclei, such as carbon and oxygen, via collisions with the interstellar matter. Therefore, the boron-to-carbon flux ratio (B/C) and the…

High Energy Astrophysical Phenomena · Physics 2022-11-22 DAMPE Collaboration

Energy spectra of abundant cosmic-ray nuclei in the NUCLEON experiment

The NUCLEON satellite experiment is designed to directly investigate the energy spectra of cosmic-ray nuclei and the chemical composition (Z=1-30) in the energy range of 2-500 TeV. The experimental results are presented, including the…

Instrumentation and Methods for Astrophysics · Physics 2018-12-11 Nikolay Gorbunov , Viktor Grebenyuk , Dmitrii Karmanov , Igor Kovalev , Ilya Kudryashov , Aleksandr Kurganov , Aleksandr Panov , Dmitry Podorozhny , Sergey Porokhovoy , Lubov Sveshnikova , Artur Tkachenko , Leonid Tkachev , Andrey Turundaevskiy , Oleg Vasiliev , Aleksandr Voronin

A Minimal Interpretation of the Galactic Cosmic-Ray Proton and Helium Spectra from GeV to PeV Energies

High-precision measurements of the cosmic-ray (CR) proton and helium spectra have revealed significant deviations from a simple power law, characterized by multiple spectral features, including a hardening above $\sim$100~GeV, a broad…

High Energy Astrophysical Phenomena · Physics 2026-04-14 Felix Aharonian , Bing Theodore Zhang

Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios

More and more experiments have identified that the energy spectra of both primary and secondary cosmic-rays exhibit a hardening above $\sim 200$ GV. Most recently, the DAMPE experiment has reported a hardening of boron-to-carbon ratio at…

High Energy Astrophysical Phenomena · Physics 2023-02-06 Pei-Pei Zhang , Xin-Yu He , Wei Liu , Yi-Qing Guo

Diffusive Origin of the Cosmic-Ray Spectral Hardening

Recent data from ATIC, CREAM and PAMELA revealed that the energy spectra of cosmic ray (CR) nuclei above 100 GeV/nucleon experience a remarkable hardening with increasing energy. This effect cannot be recovered by the conventional…

High Energy Astrophysical Phenomena · Physics 2015-06-11 N. Tomassetti

Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

We present the results of a direct measurement of the cosmic-ray helium spectrum with the CALET instrument in operation on the International Space Station since 2015. The observation period covered by this analysis spans from October 13,…

High Energy Astrophysical Phenomena · Physics 2023-05-04 O. Adriani , Y. Akaike , K. Asano , Y. Asaoka , E. Berti , G. Bigongiari , W. R. Binns , M. Bongi , P. Brogi , A. Bruno , J. H. Buckley , N. Cannady , G. Castellini , C. Checchia , M. L. Cherry , G. Collazuol , G. A. de Nolfo , K. Ebisawa , A. W. Ficklin , H. Fuke , S. Gonzi , T. G. Guzik , T. Hams , K. Hibino , M. Ichimura , K. Ioka , W. Ishizaki , M. H. Israel , K. Kasahara , J. Kataoka , R. Kataoka , Y. Katayose , C. Kato , N. Kawanaka , Y. Kawakubo , K. Kobayashi , K. Kohri , H. S. Krawczynski , J. F. Krizmanic , P. Maestro , P. S. Marrocchesi , A. M. Messineo , J. W. Mitchell , S. Miyake , A. A. Moiseev , M. Mori , N. Mori , H. M. Motz , K. Munakata , S. Nakahira , J. Nishimura , S. Okuno , J. F. Ormes , S. Ozawa , L. Pacini , P. Papini , B. F. Rauch , S. B. Ricciarini , K. Sakai , T. Sakamoto , M. Sasaki , Y. Shimizu , A. Shiomi , P. Spillantini , F. Stolzi , S. Sugita , A. Sulaj , M. Takita , T. Tamura , T. Terasawa , S. Torii , Y. Tsunesada , Y. Uchihori , E. Vannuccini , J. P. Wefel , K. Yamaoka , S. Yanagita , A. Yoshida , K. Yoshida , W. V. Zober

Energy spectra of elemental groups of cosmic rays with the KASCADE experiment data and machine learning

We report the reconstruction of the mass component spectra of cosmic rays (protons, helium, carbon, silicon and iron) and their mean mass composition, at energies from 1.4 to 100 PeV. The results are derived from the archival data of the…

High Energy Astrophysical Phenomena · Physics 2024-06-28 M. Yu. Kuznetsov , N. A. Petrov , I. A. Plokhikh , V. V. Sotnikov

Meaurement of Cosmic Ray elemental composition from the CAKE balloon experiment

CAKE (Cosmic Abundances below Knee Energies) was a prototype balloon experiment for the determination of the charge spectra and of abundances of the primary cosmic-rays (CR) with Z$>$10. It was a passive instrument made of layers of CR39…

High Energy Astrophysical Phenomena · Physics 2015-05-14 S. Cecchini , T. Chiarusi , G. Giacomelli , E. Medinaceli , L. Patrizii , G. Sirri , V. Togo

Measurement of the cosmic-ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic…

High Energy Astrophysical Phenomena · Physics 2019-10-02 Q. An , R. Asfandiyarov , P. Azzarello , P. Bernardini , X. J. Bi , M. S. Cai , J. Chang , D. Y. Chen , H. F. Chen , J. L. Chen , W. Chen , M. Y. Cui , T. S. Cui , H. T. Dai , A. D'Amone , A. De Benedittis , I. De Mitri , M. Di Santo , M. Ding , T. K. Dong , Y. F. Dong , Z. X. Dong , G. Donvito , D. Droz , J. L. Duan , K. K. Duan , D. D'Urso , R. R. Fan , Y. Z. Fan , F. Fang , C. Q. Feng , L. Feng , P. Fusco , V. Gallo , F. J. Gan , M. Gao , F. Gargano , K. Gong , Y. Z. Gong , D. Y. Guo , J. H. Guo , X. L. Guo , S. X. Han , Y. M. Hu , G. S. Huang , X. Y. Huang , Y. Y. Huang , M. Ionica , W. Jiang , X. Jin , J. Kong , S. J. Lei , S. Li , W. L. Li , X. Li , X. Q. Li , Y. Li , Y. F. Liang , Y. M. Liang , N. H. Liao , C. M. Liu , H. Liu , J. Liu , S. B. Liu , W. Q. Liu , Y. Liu , F. Loparco , C. N. Luo , M. Ma , P. X. Ma , S. Y. Ma , T. Ma , X. Y. Ma , G. Marsella , M. N. Mazziotta , D. Mo , X. Y. Niu , X. Pan , W. X. Peng , X. Y. Peng , R. Qiao , J. N. Rao , M. M. Salinas , G. Z. Shang , W. H. Shen , Z. Q. Shen , Z. T. Shen , J. X. Song , H. Su , M. Su , Z. Y. Sun , A. Surdo , X. J. Teng , A. Tykhonov , S. Vitillo , C. Wang , H. Wang , H. Y. Wang , J. Z. Wang , L. G. Wang , Q. Wang , S. Wang , X. H. Wang , X. L. Wang , Y. F. Wang , Y. P. Wang , Y. Z. Wang , Z. M. Wang , D. M. Wei , J. J. Wei , Y. F. Wei , S. C. Wen , D. Wu , J. Wu , L. B. Wu , S. S. Wu , X. Wu , K. Xi , Z. Q. Xia , H. T. Xu , Z. H. Xu , Z. L. Xu , Z. Z. Xu , G. F. Xue , H. B. Yang , P. Yang , Y. Q. Yang , Z. L. Yang , H. J. Yao , Y. H. Yu , Q. Yuan , C. Yue , J. J. Zang , F. Zhang , J. Y. Zhang , J. Z. Zhang , P. F. Zhang , S. X. Zhang , W. Z. Zhang , Y. Zhang , Y. J. Zhang , Y. L. Zhang , Y. P. Zhang , Y. Q. Zhang , Z. Zhang , Z. Y. Zhang , H. Zhao , H. Y. Zhao , X. F. Zhao , C. Y. Zhou , Y. Zhou , X. Zhu , Y. Zhu , S. Zimmer

On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings

More than fifty years after the discovery of the knee in the cosmic ray spectra, its physical origin remains a mystery. This is partly due to the ambiguity of the energy spectrum of individual composition. Recently, direct measurements from…

High Energy Astrophysical Phenomena · Physics 2018-08-01 Yi-Qing Guo , Qiang Yuan

A Combined Interpretation of CR Nuclei and Antiproton High Energy Measurements

In the last months several ballon and satellite experiments improved significantly our knowledge of cosmic rays (CR) spectra at high energy. In particular CREAM allowed to measure B/C, C/O and N/O up to 1 TeV and PAMELA the anti-p/p ratio…

High Energy Astrophysical Phenomena · Physics 2009-09-25 C. Evoli , D. Gaggero , D. Grasso , L. Maccione

First results of the cosmic ray NUCLEON experiment

The NUCLEON experiment was designed to study the chemical composition and energy spectra of galactic cosmic ray nuclei from protons to zinc at energies of $\sim10^{11}$--$10^{15}$\,eV per particle. The research was carried out with the…

High Energy Astrophysical Phenomena · Physics 2018-07-03 E. Atkin , V. Bulatov , V. Dorokhov , N. Gorbunov , S. Filippov , V. Grebenyuk , D. Karmanov , I. Kovalev , I. Kudryashov , A. Kurganov , M. Merkin , A. Panov , D. Podorozhny , D. Polkov , S. Porokhovoy , V. Shumikhin , L. Sveshnikova , A. Tkachenko , L. Tkachev , A. Turundaevskiy , O. Vasiliev , A. Voronin