Evidence for a spectral break or curvature in the spectrum of astrophysical neutrinos from 5 TeV to 10 PeV

R Abbasi; M Ackermann; J Adams; S. K Agarwalla; J. A Aguilar; M Ahlers; J. M Alameddine; S Ali; N. M Amin; K Andeen; C Arguelles; Y Ashida; S Athanasiadou; S. N Axani; R Babu; X Bai; J Baines-Holmes; A Balagopal V.; S. W Barwick; S Bash; V Basu; R Bay; J. J Beatty; J Becker Tjus; P Behrens; J Beise; C Bellenghi; B Benkel; S BenZvi; D Berley; E Bernardini; D. Z Besson; E Blaufuss; L Bloom; S Blot; I Bodo; F Bontempo; J. Y Book Motzkin; C Boscolo Meneguolo; S Boser; O Botner; J Bottcher; J Braun; B Brinson; Z Brisson-Tsavoussis; R. T Burley; D Butterfield; M. A Campana; K Carloni; J Carpio; S Chattopadhyay; N Chau; Z Chen; D Chirkin; S Choi; B. A Clark; A Coleman; P Coleman; G. H Collin; D. A Coloma Borja; A Connolly; J. M Conrad; R Corley; D. F Cowen; C De Clercq; J. J DeLaunay; D Delgado; T Delmeulle; S Deng; P Desiati; K. D de Vries; G de Wasseige; T DeYoung; J. C Diaz-Velez; S DiKerby; M Dittmer; A Domi; L Draper; L Dueser; D Durnford; K Dutta; M. A DuVernois; T Ehrhardt; L Eidenschink; A Eimer; P Eller; E Ellinger; D Elsasser; R Engel; H Erpenbeck; W Esmail; S Eulig; J Evans; P. A Evenson; K. L Fan; K Fang; K Farrag; A. R Fazely; A Fedynitch; N Feigl; C Finley; L Fischer; D Fox; A Franckowiak; S Fukami; P Furst; J Gallagher; E Ganster; A Garcia; M Garcia; G Garg; E Genton; L Gerhardt; A Ghadimi; C Glaser; T Glusenkamp; J. G Gonzalez; S Goswami; A Granados; D Grant; S. J Gray; S Griffin; S Griswold; K. M Groth; D Guevel; C Gunther; P Gutjahr; C Ha; C Haack; A Hallgren; L Halve; F Halzen; L Hamacher; M Ha Minh; M Handt; K Hanson; J Hardin; A. A Harnisch; P Hatch; A Haungs; J Haussler; K Helbing; J Hellrung; B Henke; L Hennig; F Henningsen; L Heuermann; R Hewett; N Heyer; S Hickford; A Hidvegi; C Hill; G. C Hill; R Hmaid; K. D Hoffman; D Hooper; S Hori; K Hoshina; M Hostert; W Hou; T Huber; K Hultqvist; K Hymon; A Ishihara; W Iwakiri; M Jacquart; S Jain; O Janik; M Jansson; M Jeong; M Jin; N Kamp; D Kang; W Kang; X Kang; A Kappes; L Kardum; T Karg; M Karl; A Karle; A Katil; M Kauer; J. L Kelley; M Khanal; A Khatee Zathul; A Kheirandish; H Kimku; J Kiryluk; C Klein; S. R Klein; Y Kobayashi; A Kochocki; R Koirala; H Kolanoski; T Kontrimas; L Kopke; C Kopper; D. J Koskinen; P Koundal; M Kowalski; T Kozynets; N Krieger; J Krishnamoorthi; T Krishnan; K Kruiswijk; E Krupczak; A Kumar; E Kun; N Kurahashi; N Lad; C Lagunas Gualda; L Lallement Arnaud; M Lamoureux; M. J Larson; F Lauber; J. P Lazar; K Leonard DeHolton; A Leszczynska; J Liao; C Lin; Y. T Liu; M Liubarska; C Love; L Lu; F Lucarelli; W Luszczak; Y Lyu; J Madsen; E Magnus; Y Makino; E Manao; S Mancina; A Mand; I. C Maris; S Marka; Z Marka; L Marten; I Martinez-Soler; R Maruyama; J Mauro; F Mayhew; F McNally; J. V Mead; K Meagher; S Mechbal; A Medina; M Meier; Y Merckx; L Merten; J Mitchell; L Molchany; T Montaruli; R. W Moore; Y Morii; A Mosbrugger; M Moulai; D Mousadi; E Moyaux; T Mukherjee; R Naab; M Nakos; U Naumann; J Necker; L Neste; M Neumann; H Niederhausen; M. U Nisa; K Noda; A Noell; A Novikov; A. Obertacke Pollmann; V O’Dell; A Olivas; R Orsoe; J Osborn; E O’Sullivan; V Palusova; H Pandya; A Parenti; N Park; V Parrish; E. N Paudel; L Paul; C Perez de los Heros; T Pernice; J Peterson; M Plum; A Ponten; V Poojyam; Y Popovych; M Prado Rodriguez; B Pries; R Procter-Murphy; G. T Przybylski; L Pyras; C Raab; J Rack-Helleis; N Rad; M Ravn; K Rawlins; Z Rechav; A Rehman; I Reistroffer; E Resconi; S Reusch; C. D Rho; W Rhode; L Ricca; B Riedel; A Rifaie; E. J Roberts; S Robertson; M Rongen; A Rosted; C Rott; T Ruhe; L Ruohan; Dirk Ryckbosch; J Saffer; D Salazar-Gallegos; P Sampathkumar; A Sandrock; G Sanger-Johnson; M Santander; S Sarkar; J Savelberg; M Scarnera; P Schaile; M Schaufel; H Schieler; S Schindler; L Schlickmann; B Schluter; F Schluter; N Schmeisser; T Schmidt; F. G Schroder; L Schumacher; S Schwirn; S Sclafani; D Seckel; L Seen; M Seikh; S Seunarine; P. A Sevle Myhr; R Shah; S Shefali; N Shimizu; B Skrzypek; R Snihur; J Soedingrekso; A Sogaard; D Soldin; P Soldin; G Sommani; C Spannfellner; G. M Spiczak; C Spiering; Juliana Stachurska; M Stamatikos; T Stanev; T Stezelberger; T Sturwald; T Stuttard; G. W Sullivan; I Taboada; S Ter-Antonyan; A Terliuk; A Thakuri; M Thiesmeyer; W. G Thompson; J Thwaites; S Tilav; K Tollefson; S Toscano; D Tosi; A Trettin; A. K Upadhyay; K Upshaw; A Vaidyanathan; N Valtonen-Mattila; J Valverde; J Vandenbroucke; T Van Eeden; N van Eijndhoven; L Van Rootselaar; J van Santen; J Vara; F Varsi; M Venugopal; M Vereecken; S Vergara Carrasco; S Verpoest; D Veske; A Vijai; J Villarreal; C Walck; A Wang; E. H. S Warrick; C Weaver; P Weigel; A Weindl; J Weldert; A. Y Wen; C Wendt; J Werthebach; M Weyrauch; N Whitehorn; C. H Wiebusch; D. R Williams; L Witthaus; M Wolf; G Wrede; X. W Xu; J. P Yanez; Y Yao; E Yildizci; S Yoshida; R Young; F Yu; S Yu; T Yuan; A Zegarelli; S Zhang; Z Zhang; P Zhelnin; P Zilberman; IceCube Collaboration

doi:10.1103/2gh9-d4q7

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Evidence for a spectral break or curvature in the spectrum of astrophysical neutrinos from 5 TeV to 10 PeV

Journal article

Peer reviewed

Evidence for a spectral break or curvature in the spectrum of astrophysical neutrinos from 5 TeV to 10 PeV

R Abbasi, M Ackermann, J Adams, S. K Agarwalla, J. A Aguilar, M Ahlers, J. M Alameddine, S Ali, N. M Amin, K Andeen, …

Physical review letters, Vol.136(12), 121002

03/27/2026

DOI: 10.1103/2gh9-d4q7

PMID: 41965033

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Abstract

We report improved measurements of the all flavor astrophysical neutrino spectrum with IceCube by combining complementary neutrino samples in two independent analyses. Both analyses show evidence of a harder spectrum at energies below ∼30 TeV compared to higher energies where the spectrum is well characterized by a power law. The spectrum is better described by a log parabola or a broken power law, the latter being the preferred model. Both, however, reject a single power law over an energy range 5TeV–10 PeV with a significance >4σ, providing new constraints on properties of cosmic neutrino sources.

FLUX

Physics and Astronomy

Details

Title: Subtitle: Evidence for a spectral break or curvature in the spectrum of astrophysical neutrinos from 5 TeV to 10 PeV
Creators: R Abbasi
M Ackermann
J Adams
S. K Agarwalla
J. A Aguilar
M Ahlers
J. M Alameddine
S Ali
N. M Amin
K Andeen
C Arguelles
Y Ashida
S Athanasiadou
S. N Axani
R Babu
X Bai
J Baines-Holmes
A Balagopal V.
S. W Barwick
S Bash
V Basu
R Bay
J. J Beatty
J Becker Tjus
P Behrens
J Beise
C Bellenghi
B Benkel
S BenZvi
D Berley
E Bernardini
D. Z Besson
E Blaufuss
L Bloom
S Blot
I Bodo
F Bontempo
J. Y Book Motzkin
C Boscolo Meneguolo
S Boser
O Botner
J Bottcher
J Braun
B Brinson
Z Brisson-Tsavoussis
R. T Burley
D Butterfield
M. A Campana
K Carloni
J Carpio
S Chattopadhyay
N Chau
Z Chen
D Chirkin
S Choi
B. A Clark
A Coleman
P Coleman
G. H Collin
D. A Coloma Borja
A Connolly
J. M Conrad
R Corley
D. F Cowen
C De Clercq
J. J DeLaunay
D Delgado
T Delmeulle
S Deng
P Desiati
K. D de Vries
G de Wasseige
T DeYoung
J. C Diaz-Velez
S DiKerby
M Dittmer
A Domi
L Draper
L Dueser
D Durnford
K Dutta
M. A DuVernois
T Ehrhardt
L Eidenschink
A Eimer
P Eller
E Ellinger
D Elsasser
R Engel
H Erpenbeck
W Esmail
S Eulig
J Evans
P. A Evenson
K. L Fan
K Fang
K Farrag
A. R Fazely
A Fedynitch
N Feigl
C Finley
L Fischer
D Fox
A Franckowiak
S Fukami
P Furst
J Gallagher
E Ganster
A Garcia
M Garcia
G Garg
E Genton
L Gerhardt
A Ghadimi
C Glaser
T Glusenkamp
J. G Gonzalez
S Goswami
A Granados
D Grant
S. J Gray
S Griffin
S Griswold
K. M Groth
D Guevel
C Gunther
P Gutjahr
C Ha
C Haack
A Hallgren
L Halve
F Halzen
L Hamacher
M Ha Minh
M Handt
K Hanson
J Hardin
A. A Harnisch
P Hatch
A Haungs
J Haussler
K Helbing
J Hellrung
B Henke
L Hennig
F Henningsen
L Heuermann
R Hewett
N Heyer
S Hickford
A Hidvegi
C Hill
G. C Hill
R Hmaid
K. D Hoffman
D Hooper
S Hori
K Hoshina
M Hostert
W Hou
T Huber
K Hultqvist
K Hymon
A Ishihara
W Iwakiri
M Jacquart
S Jain
O Janik
M Jansson
M Jeong
M Jin
N Kamp
D Kang
W Kang
X Kang
A Kappes
L Kardum
T Karg
M Karl
A Karle
A Katil
M Kauer
J. L Kelley
M Khanal
A Khatee Zathul
A Kheirandish
H Kimku
J Kiryluk
C Klein
S. R Klein
Y Kobayashi
A Kochocki
R Koirala
H Kolanoski
T Kontrimas
L Kopke
C Kopper
D. J Koskinen
P Koundal
M Kowalski
T Kozynets
N Krieger
J Krishnamoorthi
T Krishnan
K Kruiswijk
E Krupczak
A Kumar
E Kun
N Kurahashi
N Lad
C Lagunas Gualda
L Lallement Arnaud
M Lamoureux
M. J Larson
F Lauber
J. P Lazar
K Leonard DeHolton
A Leszczynska
J Liao
C Lin
Y. T Liu
M Liubarska
C Love
L Lu
F Lucarelli
W Luszczak
Y Lyu
J Madsen
E Magnus
Y Makino
E Manao
S Mancina
A Mand
I. C Maris
S Marka
Z Marka
L Marten
I Martinez-Soler
R Maruyama
J Mauro
F Mayhew
F McNally
J. V Mead
K Meagher
S Mechbal
A Medina
M Meier
Y Merckx
L Merten
J Mitchell
L Molchany
T Montaruli
R. W Moore
Y Morii
A Mosbrugger
M Moulai
D Mousadi
E Moyaux
T Mukherjee
R Naab
M Nakos
U Naumann
J Necker
L Neste
M Neumann
H Niederhausen
M. U Nisa
K Noda
A Noell
A Novikov
A. Obertacke Pollmann
V O’Dell
A Olivas
R Orsoe
J Osborn
E O’Sullivan
V Palusova
H Pandya
A Parenti
N Park
V Parrish
E. N Paudel
L Paul
C Perez de los Heros
T Pernice
J Peterson
M Plum
A Ponten
V Poojyam
Y Popovych
M Prado Rodriguez
B Pries
R Procter-Murphy
G. T Przybylski
L Pyras
C Raab
J Rack-Helleis
N Rad
M Ravn
K Rawlins
Z Rechav
A Rehman
I Reistroffer
E Resconi
S Reusch
C. D Rho
W Rhode
L Ricca
B Riedel
A Rifaie
E. J Roberts
S Robertson
M Rongen
A Rosted
C Rott
T Ruhe
L Ruohan
Dirk Ryckbosch
J Saffer
D Salazar-Gallegos
P Sampathkumar
A Sandrock
G Sanger-Johnson
M Santander
S Sarkar
J Savelberg
M Scarnera
P Schaile
M Schaufel
H Schieler
S Schindler
L Schlickmann
B Schluter
F Schluter
N Schmeisser
T Schmidt
F. G Schroder
L Schumacher
S Schwirn
S Sclafani
D Seckel
L Seen
M Seikh
S Seunarine
P. A Sevle Myhr
R Shah
S Shefali
N Shimizu
B Skrzypek
R Snihur
J Soedingrekso
A Sogaard
D Soldin
P Soldin
G Sommani
C Spannfellner
G. M Spiczak
C Spiering
Juliana Stachurska
M Stamatikos
T Stanev
T Stezelberger
T Sturwald
T Stuttard
G. W Sullivan
I Taboada
S Ter-Antonyan
A Terliuk
A Thakuri
M Thiesmeyer
W. G Thompson
J Thwaites
S Tilav
K Tollefson
S Toscano
D Tosi
A Trettin
A. K Upadhyay
K Upshaw
A Vaidyanathan
N Valtonen-Mattila
J Valverde
J Vandenbroucke
T Van Eeden
N van Eijndhoven
L Van Rootselaar
J van Santen
J Vara
F Varsi
M Venugopal
M Vereecken
S Vergara Carrasco
S Verpoest
D Veske
A Vijai
J Villarreal
C Walck
A Wang
E. H. S Warrick
C Weaver
P Weigel
A Weindl
J Weldert
A. Y Wen
C Wendt
J Werthebach
M Weyrauch
N Whitehorn
C. H Wiebusch
D. R Williams
L Witthaus
M Wolf
G Wrede
X. W Xu
J. P Yanez
Y Yao
E Yildizci
S Yoshida
R Young
F Yu
S Yu
T Yuan
A Zegarelli
S Zhang
Z Zhang
P Zhelnin
P Zilberman
IceCube Collaboration
Resource Type: Journal article
Publication Details: Physical review letters, Vol.136(12), 121002
DOI: 10.1103/2gh9-d4q7
PMID: 41965033
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Publisher: American Physical Society
Grant note: USA-U.S. National Science Foundation-Office of Polar Programs, U.S. National Science Foundation-Physics Division, U.S. National Science Foundation-EPSCoR, U.S. National Science Foundation-Office of Advanced Cyberinfrastructure, Wisconsin Alumni Research Fo Center for High Throughput Computing (CHTC) at the University of Wisconsin-Madison Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) NVIDIA Corporation Google Cloud Platform FWO Odysseus and Big Science programmes Belgian Federal Science Policy Office (Belspo) Germany-Bundesministerium fur Bildung und Forschung (BMBF) Deutsche Forschungsgemeinschaft (DFG) Helmholtz Alliance for Astroparticle Physics (HAP), Initiative and Networking Fund of the Helmholtz Association Sweden-Swedish Research Council Swedish Polar Research Secretariat Knut and Alice Wallenberg Foundation European Union-EGI Advanced Computing for research Australia-Australian Research Council Digital Research Alliance of Canada DenmarkVillum Fonden Carlsberg Foundation European Commission New Zealand-Marsden Fund JapanJapan Society for Promotion of Science (JSPS) Korea-National Research Foundation of Korea (NRF) Switzerland-Swiss National Science Foundation (SNSF)
The authors gratefully acknowledge the support from the following agencies and institutions: USA-U.S. National Science Foundation-Office of Polar Programs, U.S. National Science Foundation-Physics Division, U.S. National Science Foundation-EPSCoR, U.S. National Science Foundation-Office of Advanced Cyberinfrastructure, Wisconsin Alumni Research Foundation, Center for High Throughput Computing (CHTC) at the University of Wisconsin-Madison, Open Science Grid (OSG), Partnership to Advance Throughput Computing (PATh), Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS), Frontera and Ranch computing project at the Texas Advanced Computing Center, U.S. Department of Energy-National Energy Research Scientific Computing Center, Particle astrophysics research computing center at the University of Maryland, Institute for Cyber-Enabled Research at Michigan State University, Astroparticle physics computational facility at Marquette University, NVIDIA Corporation, and Google Cloud Platform; Belgium-Funds for Scientific Research (FRS-FNRS and FWO), FWO Odysseus and Big Science programmes, and Belgian Federal Science Policy Office (Belspo); Germany-Bundesministerium fur Bildung und Forschung (BMBF), Deutsche Forschungsgemeinschaft (DFG), Helmholtz Alliance for Astroparticle Physics (HAP), Initiative and Networking Fund of the Helmholtz Association, Deutsches Elektronen Synchrotron (DESY), and High Performance Computing cluster of the RWTH Aachen; Sweden-Swedish Research Council, Swedish Polar Research Secretariat, Swedish National Infrastructure for Computing (SNIC), and Knut and Alice Wallenberg Foundation; European Union-EGI Advanced Computing for research; Australia-Australian Research Council; Canada-Natural Sciences and Engineering Research Council of Canada, Calcul Quebec, Compute Ontario, Canada Foundation for Innovation, WestGrid, and Digital Research Alliance of Canada; DenmarkVillum Fonden, Carlsberg Foundation, and European Commission; New Zealand-Marsden Fund; JapanJapan Society for Promotion of Science (JSPS) and Institute for Global Prominent Research (IGPR) of Chiba University; Korea-National Research Foundation of Korea (NRF); Switzerland-Swiss National Science Foundation (SNSF).
Language: English
Date published: 03/27/2026
Academic Unit: Physics and Astronomy
Record Identifier: 9985176770602771

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Evidence for a spectral break or curvature in the spectrum of astrophysical neutrinos from 5 TeV to 10 PeV

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