I Physics Review Letters 134: Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts

[kodama]

TL;DR

New Bosons

Phys. Rev. Lett. 134, 063002 – Published 11 February, 2025
https://journals.aps.org/prl/

Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts​

Menno Door1,2,*,†, Chih-Han Yeh3,*,‡, Matthias Heinz4,5,1,§, Fiona Kirk3,6, Chunhai Lyu1, Takayuki Miyagi4,5,1, Julian C. Berengut7, Jacek Bieroń8, Klaus Blaum1 et al.

"Additionally, we perform a King plot analysis to set bounds on a fifth force in the keV/𝑐2 to MeV/𝑐2 range coupling to electrons and neutrons."

reference source
DOI: https://doi.org/10.1103/PhysRevLett.134.063002

23 sigma for Mev mass new boson

based on MIT
Physical Review Letters

Evidence for Nonlinear Isotope Shift in Yb+ Search for New Boson

Ian Counts1,*, Joonseok Hur1,*, Diana P. L. Aude Craik1, Honggi Jeon2, Calvin Leung1, Julian C. Berengut3, Amy Geddes3, Akio Kawasaki4, Wonho Jhe2 et al.

Phys. Rev. Lett. 125, 123002 – Published 15 September, 2020
Hints of Dark Bosons
Published 15 September, 2020

"A signal predicted for a type of dark matter appears in the spectra of ytterbium isotopes."

reference source
DOI: https://doi.org/10.1103/PhysRevLett.125.123002

Hints of Dark Bosons​

September 15, 2020• Physics 13, s115
A signal predicted for a type of dark matter appears in the spectra of ytterbium isotopes.

"In their experiments, both teams measured the so-called isotope shift—the change in atomic spectra exhibited by isotopes of the same element. A group led by Vladan Vuletić of the Massachusetts Institute of Technology measured this shift between five ytterbium istotopes..., could also indicate the existence of dark bosons."

reference source
https://physics.aps.org/articles/v13/s115

i wonder if it is x17 boson since the predicted mass is mev

 

[weirdoguy]

i wonder if it is x17 boson since the predicted mass is mev

From Wikipedia:

As of December 2019, the ATOMKI paper describing the particle [x17 boson] has not been peer reviewed and should therefore be considered preliminary.[24] In late 2019, a follow-up paper was published in Acta Physica Polonica B.[1] Efforts by CERN and other groups to independently detect the particle have been unsuccessful so far.[25]

The ATOMKI group had claimed to find various other new particles earlier in 2016 but abandoned these claims later, without an explanation of what caused the spurious signals. The group has also been accused of cherry-picking results that support new particles while discarding null results.[5][26]

 

[kodama]

https://indico.global/event/652/contributions/16905/attachments/57490/110416/UCLADM2025_PADME_v2.pdf

 

[pines-demon]

Apparently it has already been disproved, see:

• Atomic anomaly explained without recourse to hypothetical ‘dark force’ (Physics World, 27 March 2025)

A team led by Tanja Mehlstäubler from the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig and Klaus Blaum from the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg has now confirmed that the anomaly is real. However, the PTB-MPIK researchers say it does not stem from a dark force. Instead, it arises from the way the nuclear structure of ytterbium isotopes deforms as more neutrons are added.

Note that Blaum is also a co-author of the 2025 dark boson paper.

X17 has nothing do with all this.