X17 observed (again) but in Helium?

New 17 MeV Boson in the hunt for dark matter

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X17 observed (again) but in Helium?

#1  Postby newolder » Nov 21, 2019 6:27 pm

A 17 MeV/c[sup2[/sup] boson (x33 electron mass), tentatively observed in 2016 in Berylium-8 decays, has been tentatively observed (7.2 sigma is a strong signal though) again in Helium-4 decays.

The original Be-8 work appear in Physics. Rev. and the new work is in the arXiv awaiting peer review...
New evidence supporting the existence of the hypothetic X17 particle

A.J. Krasznahorkay, M. Csatlos, L. Csige, J. Gulyas, M. Koszta, B. Szihalmi, J. Timar, D.S. Firak, A. Nagy, N.J. Sas, A. Krasznahorkay
(Submitted on 23 Oct 2019)

We observed electron-positron pairs from the electro-magnetically forbidden M0 transition depopulating the 21.01 MeV 0− state in 4He. A peak was observed in their e+e− angular correlations at 115∘ with 7.2σ significance, and could be described by assuming the creation and subsequent decay of a light particle with mass of mXc2=16.84±0.16(stat)±0.20(syst) MeV and ΓX= 3.9×10−5 eV. According to the mass, it is likely the same X17 particle, which we recently suggested [Phys. Rev. Lett. 116, 052501 (2016)] for describing the anomaly observed in 8Be.


There's also a [url]Science Alert[/url] article out yesterday.
...
If the discovery is confirmed, not only could learning more about X17 let us better understand the forces that govern our Universe, it could also help scientists solve the dark matter problem once and for all.
...


:popcorn: :coffee:
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Re: X17 observed (again) but in Helium?

#2  Postby newolder » Nov 26, 2019 2:32 pm

Article @ Forbes by Ethan Siegal:
This Is Why The 'X17' Particle And A New, Fifth Force Probably Don't Exist

...
Until we directly detect a new particle, remain skeptical. Until these early results are successfully replicated by a completely independent team using a completely independent setup, remain highly skeptical. As particle physicist Don Lincoln notes, the history of physics is littered with fantastic claims that fell apart under closer scrutiny. Until that scrutiny arrives, bet on the X17 as an error, not as a slam-dunk Nobel Prize.


Forbes link

ETA Missing Science Alert link from previous post: https://www.sciencealert.com/physicists ... -of-nature

:doh:
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Breaking the standard model??

#3  Postby Macdoc » Dec 22, 2019 4:44 am

mebbe ....mebbe not

New boson appears in nuclear decay, breaks standard model
Weird electron-positrons from decaying beryllium and helium hint at new boson.

CHRIS LEE - 12/20/2019, 11:54 AM

Image
In the world of physics, nothing gets the blood flowing like the thought that a new particle has been discovered. For decades now, physicists have been hunting for evidence that modern physics isn’t right. But, the smoking gun has remained elusive. In November, people started polishing a Nobel prize for a group of physicists who seemed to have found new boson. And, a new boson means a new force, which is even more exciting. Is that gun smoking yet?


morehttps://arstechnica.com/science/201 ... ics-maybe/
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Re: Breaking the standard model??

#4  Postby felltoearth » Dec 22, 2019 5:25 am

I’m pretty sure new older posted this somewhere else already.

ETA yep here

http://www.rationalskepticism.org/post2721448.html
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Re: Breaking the standard model??

#5  Postby felltoearth » Dec 22, 2019 5:05 pm

"Walla Walla Bonga!" — Witticism
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Re: X17 observed (again) but in Helium?

#6  Postby newolder » Jan 26, 2020 3:13 pm

History, explanation and the science of this proposed beastie in a tube by the Sixty Symbols group and posted today.

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Re: X17 observed (again) but in Helium?

#7  Postby newolder » Jun 11, 2020 1:26 pm

Further developments, and pointers to disproofs:
More evidence for a ‘fifth force’ found in radioactive decay measurements
11 Jun 2020

Anomalies in the radioactive decay of beryllium-8 and helium-4 point to the existence of a new force of nature. That is the conclusion of a group of theorists in the US, who have scrutinized data from experiments carried out by nuclear physicists in Hungary over the past five years. Results from the two different isotopes agree on both the mass and interaction strength of the hypothetical boson that would carry the long-sought fifth force, the team found.
...

More @ physicsworld link
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