Measurement of the cosmic p+He energy spectrum from 50 GeV to 0.5 PeV with the DAMPE space mission
- Autori: Alemanno F.; Altomare C.; An Q.; Azzarello P.; Barbato F.C.T.; Bernardini P.; Bi X.J.; Cagnoli I.; Cai M.S.; Casilli E.; Catanzani E.; Chang J.; Chen D.Y.; Chen J.L.; Chen Z.F.; Coppin P.; Cui M.Y.; Cui T.S.; Cui Y.X.; Dai H.T.; De Benedittis A.; De Mitri I.; De Palma F.; Deliyergiyev M.; Di Giovanni A.; Di Santo M.; Ding Q.; Dong T.K.; Dong Z.X.; Donvito G.; Droz D.; Duan J.L.; Duan K.K.; Fan R.R.; Fan Y.Z.; Fang F.; Fang K.; Feng C.Q.; Feng L.; Alonso M.F.; Frieden J.M.; Fusco P.; Gao M.; Gargano F.; Gong K.; Gong Y.Z.; Guo D.Y.; Guo J.H.; Han S.X.; Hu Y.M.; Huang G.S.; Huang X.Y.; Huang Y.Y.; Ionica M.; Jiang L.Y.; Jiang Y.Z.; Jiang W.; Kong J.; Kotenko A.; Kyratzis D.; Lei S.J.; Li W.H.; Li W.L.; Li X.; Li X.Q.; Liang Y.M.; Liu C.M.; Liu H.; Liu J.; Liu S.B.; Liu Y.; Loparco F.; Luo C.N.; Ma M.; Ma P.X.; Ma T.; Ma X.Y.; Marsella G.; Mazziotta M.N.; Mo D.; Salinas M.M.; Niu X.Y.; Pan X.; Parenti A.; Peng W.X.; Peng X.Y.; Perrina C.; Putti-Garcia E.; Qiao R.; Rao J.N.; Ruina A.; Shangguan Z.; Shen W.H.; Shen Z.Q.; Shen Z.T.; Silveri L.; Song J.X.; Stolpovskiy M.; Su H.; Su M.; Sun H.R.; Sun Z.Y.; Surdo A.; Teng X.J.; Tykhonov A.; Wang J.Z.; Wang L.G.; Wang S.; Wang S.X.; Wang X.L.; Wang Y.; Wang Y.F.; Wang Y.Z.; Wang Z.M.; Wei D.M.; Wei J.J.; Wei Y.F.; Wu D.; Wu J.; Wu L.B.; Wu S.S.; Wu X.; Xia Z.Q.; Xu H.T.; Xu J.; Xu Z.H.; Xu Z.L.; Xu E.H.; Xu Z.Z.; Xue G.F.; Yang H.B.; Yang P.; Yang Y.Q.; Yao H.J.; Yu Y.H.; Yuan G.W.; Yuan Q.; Yue C.; Zang J.J.; Zhang S.X.; Zhang W.Z.; Zhang Y.; Zhang Y.; Zhang Y.J.; Zhang Y.L.; Zhang Y.P.; Zhang Y.Q.; Zhang Z.; Zhang Z.Y.; Zhao C.; Zhao H.Y.; Zhao X.F.; Zhou C.Y.; Zhu Y.
- Anno di pubblicazione: 2024
- Tipologia: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/667608
Abstract
Recent observations of the light component of the cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to the highest energies. The Dark Matter Particle Explorer is a satellite-based cosmic-ray experiment that has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, and particle identification capabilities. In this work, the latest measurements of the energy spectrum of proton+helium in the energy range from 46 GeV to 464 TeV are presented. Among the most distinctive features of the spectrum, a spectral hardening at 600 GeV has been observed, along with a softening at 29 TeV measured with a 6.6σ significance. Moreover, the detector features and the analysis approach allowed for the extension of the spectral measurement up to the sub-PeV region. Even if with small statistical significance due to the low number of events, data suggest a new spectral hardening at about 150 TeV.