Study of the Beta Spectrum Shape of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>Rb</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>92</mn></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>Cs</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>142</mn></mrow></mmultiscripts></mrow></math> Decays for the Prediction of Reactor Antineutrino Spectra

G. A. Alcalá; A. Algora; M. Estienne; M. Fallot; V. Guadilla; A. Beloeuvre; W. Gelletly; R. Kean; A. Porta; S. Bouvier; J.-S. Stutzmann; E. Bonnet; T. Eronen; D. Etasse; J. Agramunt; J. L. Tain; H. Garcia Cabrera; L. Giot; A. Laureau; J. A. Victoria; Y. Molla; A. Jaries; L. Al Ayoubi; O. Beliuskina; W. Gins; M. Hukkanen; A. Illana; A. Kankainen; S. Kujanpää; I. Moore; I. Pohjalainen; D. Pitman; A. Raggio; M. Reponen; J. Romero; J. Ruotsalainen; M. Stryjczyk; A. Tolosa; V. Virtanen

doi:10.1103/hyj7-l22h

Study of the Beta Spectrum Shape of ${}^{92}{Rb}$ and ${}^{142}{Cs}$ Decays for the Prediction of Reactor Antineutrino Spectra

G. A. Alcalá ^1,*, A. Algora ^1,2,†, M. Estienne ³, M. Fallot ³, V. Guadilla ^3,4, A. Beloeuvre³, W. Gelletly ⁵, R. Kean³, A. Porta ³ et al.

S. Bouvier³, J.-S. Stutzmann³, E. Bonnet ³, T. Eronen ⁶, D. Etasse⁷, J. Agramunt¹, J. L. Tain ¹, H. Garcia Cabrera ^1,8, L. Giot³, A. Laureau ³, J. A. Victoria ¹, Y. Molla³, A. Jaries ⁶, L. Al Ayoubi ⁶, O. Beliuskina ⁶, W. Gins⁶, M. Hukkanen⁶, A. Illana ^6,9, A. Kankainen ⁶, S. Kujanpää ⁶, I. Moore ⁶, I. Pohjalainen⁶, D. Pitman ^6,10, A. Raggio ⁶, M. Reponen ⁶, J. Romero^6,11, J. Ruotsalainen⁶, M. Stryjczyk ^6,12, A. Tolosa^6,13, and V. Virtanen⁶

¹Instituto de Física Corpuscular, CSIC-Universitat de València, E-46071 València, Spain
²HUN-REN Institute for Nuclear Research (ATOMKI), H-4001 Debrecen, Hungary
³SUBATECH, CNRS/IN2P3, IMT Atlantique, Nantes Université, F-44307 Nantes, France
⁴Faculty of Physics, University of Warsaw, 02-093 Warsaw, Poland
⁵Department of Physics, University of Surrey, GU27XH Guildford, United Kingdom
⁶Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
⁷LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, F-Caen, France
⁸Universidad Europea de Madrid, Department of Biosciences, Faculty of Biomedical and Health Sciences, E-28670 Madrid, Spain
⁹Grupo de Física Nuclear, EMFTEL, and IPARCOS, Universidad Complutense de Madrid, CEI Moncloa, E-28040 Madrid, Spain
¹⁰Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
¹¹Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
¹²Institut Laue-Langevin, 71 Avenue des Martyrs, F-38042 Grenoble, France
¹³European Organization for Nuclear Research (CERN), Geneva, Switzerland

^*Contact author: galcala@ific.uv.es
^†Contact author: algora@ific.uv.es

PDF

Phys. Rev. Lett. 135, 142502 – Published 2 October, 2025

DOI: https://doi.org/10.1103/hyj7-l22h

Abstract

The shapes of the beta spectra of ${}^{92}{Rb}$ and ${}^{142}{Cs}$ , two of the beta decays most relevant for the prediction of the antineutrino spectrum in reactors, have been measured. A new setup composed of two $Δ E − E$ telescopes has been used. High-purity radioactive beams of the isotopes of interest were provided by the IGISOL facility using the JYFLTRAP double Penning trap. The resulting beta spectra have been compared with model predictions using beta decay feedings from total absorption gamma spectroscopy measurements and shape corrections employed in the calculation of the antineutrino spectrum, corroborating both further. The procedure can be extended to other relevant nuclei in the future, providing solid ground for the prediction of the antineutrino spectrum in reactors.

Physical Review Letters

Export citation

Export citation

Study of the Beta Spectrum Shape of ${}^{92}{Rb}$ and ${}^{142}{Cs}$ Decays for the Prediction of Reactor Antineutrino Spectra

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Other Options

References (Subscription Required)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Study of the Beta Spectrum Shape of Rb92 and Cs142 Decays for the Prediction of Reactor Antineutrino Spectra

Abstract

Physics Subject Headings (PhySH)

Authorization Required

Log in via your institution

Log in via APS Member Subscription

Other Options

References (Subscription Required)

Study of the Beta Spectrum Shape of ${}^{92}{Rb}$ and ${}^{142}{Cs}$ Decays for the Prediction of Reactor Antineutrino Spectra