High-precision branching-ratio measurement for the superallowed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>β</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>emitter<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>26</mml:mn></mml:msup></mml:math>Al<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mi>m</mml:mi></mml:msup></mml:math>

Finlay, P.; Ball, G. C.; Leslie, J. R.; Svensson, C. E.; Andreoiu, C.; Austin, R. A. E.; Bandyopadhyay, D.; Cross, D. S.; Demand, G. A.; Djongolov, M.; Ettenauer, S.; Garrett, P. E.; Green, K. L.; Grinyer, G. F.; Hackman, G.; Leach, K. G.; Pearson, C. J.; Phillips, A. A.; Rand, E. T.; Sumithrarachchi, C. S.; Triambak, S.; Williams, Spencer J.

doi:10.1103/physrevc.85.055501

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…Other superallowed branching ratio measurements with the 8π spectrometer include: (1) an inclusive upper limit of 15 ppm on all non-superallowed branches in 26m Al decay [189], and (2) an ultra-sensitive measurement of the superallowed branching ratio for 38m K decay, in which the competing internal M3 γ decay was observed for the first time, changing the adopted superallowed branching ratio for this decay by more than 16 times the previously quoted uncertainty [190].…”

Section: Fundamental Symmetry Testsmentioning

confidence: 99%

The TRIUMF-ISAC facility: two decades of discovery with rare isotope beams

2016

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Since 1999, the TRIUMF-ISAC facility has been providing rare isotope beams for nuclear physics experiments. The three pillars of the program are nuclear structure, nuclear astrophysics, and fundamental symmetries. This article reviews highlights of each of these aspects of the ISAC science program, including tests of the collective behaviors, first explained by Bohr, Mottelson and Rainwater, at the limits of nuclear stability, and future prospects with the ARIEL facility at TRIUMF.

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Section: Fundamental Symmetry Testsmentioning

confidence: 99%

The TRIUMF-ISAC facility: two decades of discovery with rare isotope beams

2016

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“…The decay of some isotopes serves as a counter to this process. This can be seen in the case of 26 Al, which decays rather quickly (around 6 s) into 26 Mg (see Finlay et al 2012). Figure 2 shows the elements in the periodic table together with their cosmic origin (Kobayashi et al 2020).…”

Section: Chemical Enrichmentmentioning

confidence: 83%

Bringing Stellar Evolution and Feedback Together: Summary of Proposals from the Lorentz Center Workshop

Geen

Agrawal

Crowther

et al. 2023

PASP

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Stars strongly impact their environment, and shape structures on all scales throughout the universe, in a process known as “feedback.” Due to the complexity of both stellar evolution and the physics of larger astrophysical structures, there remain many unanswered questions about how feedback operates and what we can learn about stars by studying their imprint on the wider universe. In this white paper, we summarize discussions from the Lorentz Center meeting “Bringing Stellar Evolution and Feedback Together” in 2022 April and identify key areas where further dialog can bring about radical changes in how we view the relationship between stars and the universe they live in.

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“…It is directly connected to the 26 Al g state via the highly-suppressed M 5 γ-decay with a half-life of 80,500 yr according to shell model calculations (Coc et al, 2000;Banerjee et al, 2018). 26 Al m decays with a half-life of just 6.346 s almost exclusively to the ground state of 26 Mg via super-allowed β + -decay (Audi et al, 2017), with a branching ratio of Diehl et al 100.0000 +0 −0.0015 (Finlay et al, 2012). In cosmic nucleosynthesis, the correct treatment of 26 Al m and 26 Al g in reaction network calculations is crucial (Runkle et al, 2001;Gupta & Meyer, 2001).…”

Section: Introductionmentioning

confidence: 99%

The Radioactive Nuclei $^{\textbf{26}}$Al and $^{\textbf{60}}$Fe in the Cosmos and in the Solar System

Diehl,

Lugaro,

Heger

et al. 2021

Preprint

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The cosmic evolution of the chemical elements from the Big Bang to the present time is driven by nuclear fusion reactions inside stars and stellar explosions. A cycle of matter recurrently re-processes metal-enriched stellar ejecta into the next generation of stars. The study of cosmic nucleosynthesis and of this matter cycle requires the understanding of the physics of nuclear reactions, of the conditions at which the nuclear reactions are activated inside the stars and stellar explosions, of the stellar ejection mechanisms through winds and explosions, and of the transport of the ejecta towards the next cycle, from hot plasma to cold, star-forming gas. Due to the long timescales of stellar evolution, and because of the infrequent occurrence of stellar explosions, observational studies are challenging, as they have biases in time and space as well as different sensitivities related to the various astronomical methods. Here, we describe in detail the astrophysical and nuclear-physical processes involved in creating two radioactive isotopes useful in such studies, 26 Al and 60 Fe. Due to their radioactive lifetime of the order of a million years these isotopes are suitable to characterise simultaneously the processes of nuclear fusion reactions and of interstellar transport. We describe and discuss the nuclear reactions involved in the production and destruction of 26 Al and 60 Fe, the key characteristics of the stellar sites of their nucleosynthesis and their interstellar journey after ejection from the nucleosynthesis sites. This allows us to connect the theoretical astrophysical aspects to the variety of astronomical messengers presented here, from stardust and cosmic-ray composition measurements, through observation of γ rays produced by radioactivity, to material deposited in deep-sea ocean crusts and to the inferred composition of the first solids that have formed in the Solar System. We show that considering measurements of the isotopic ratio of 26 Al to 60 Fe eliminate some of the unknowns when interpreting astronomical results, and discuss the lessons learned from these two isotopes on cosmic chemical evolution. This review paper has emerged from an ISSI-BJ Team project in 2017-2019, bringing together nuclear physicists, astronomers, and astrophysicists in this inter-disciplinary discussion.

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High-precision branching-ratio measurement for the superallowedβ+emitter26Alm

Cited by 12 publications

References 21 publications

The TRIUMF-ISAC facility: two decades of discovery with rare isotope beams

The TRIUMF-ISAC facility: two decades of discovery with rare isotope beams

Bringing Stellar Evolution and Feedback Together: Summary of Proposals from the Lorentz Center Workshop

The Radioactive Nuclei $^{\textbf{26}}$Al and $^{\textbf{60}}$Fe in the Cosmos and in the Solar System

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