# Search for the decay of nature’s rarest isotope 180mTa

@article{Lehnert2017SearchFT,
title={Search for the decay of nature’s rarest isotope 180mTa},
author={B. Lehnert and M. Hult and G. Lutter and Kai Zuber},
journal={Physical Review C},
year={2017},
volume={95},
pages={044306}
}
• Published 13 September 2016
• Physics
• Physical Review C
$^{\rm {180m}}$Ta is the rarest naturally occurring quasi-stable isotope and the longest lived metastable state which is known. Its possible decay via the $\beta^-$ or the electron capture channel has never been observed. This article presents a search for the decay of $^{\rm {180m}}$Ta with an ultra low background Sandwich HPGe gamma spectrometry setup in the HADES underground laboratory. No signal is observed and improved lower partial half-life limits are set with a Bayesian analysis to $5.8… 16 Citations ## Figures and Tables from this paper Experimental searches for rare alpha and beta decays • Physics The European Physical Journal A • 2019 Abstract.The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large Search for dark matter induced de-excitation of$^{180}$Ta$\rm ^m$• Physics • 2019 Weak-scale dark matter particles, in collisions with nuclei, can mediate transitions between different nuclear energy levels. In particular, owing to sizeable momentum exchange, dark matter particles Search for Dark Matter Induced Deexcitation of ^{180}Ta^{m}. • Physics Physical review letters • 2020 This Letter utilizes data from a past experiment with ^{180}Ta^{m} to search for γ lines that would accompany dark matter induced de-excitation of this isomer and derives novel constraints on dark matter models with strongly interacting relics and on models with inelastic dark matter particles. Exploratory study of the 180mTa(γ,γ′)180Ta reaction with mono-energetic low-energy photon beams at HIγS • Physics Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment • 2019 Development of CANDLES Low Background HPGe Detector and Half-life Measurement of 180Tam • Physics • 2018 A low background HPGe detector system was developed at CANDLES Experimental Hall for multipurpose use. Various low background techniques were employed, including hermatic shield design, radon gas Metastable nuclear isomers as dark matter accelerators • Physics • 2020 Inelastic dark matter and strongly interacting dark matter are poorly constrained by direct detection experiments since they both require the scattering event to deliver energy from the nucleus into Beta decays in investigations and searches for rare effects Current status of experimental investigations of rare single β decays (48Ca, 50V, 96Zr, 113Cd, 113mCd, 115In, 123Te, 180mTa, 222Rn) is reviewed. Nuclei which decay through single β decay very often The curious case of tantalum 180 • Physics • 2017 We discuss the physics of the rarest natural isotope 180Ta that has a lifetime of its isomeric state (77 keV) more than 1016 years due to the very large difference of quantum numbers with respect to First direct observation of isomeric decay in neutron-rich odd-odd Ta186 • Physics Physical Review C • 2021 Y.X. Watanabe, ∗ P.M. Walker, Y. Hirayama, M. Mukai, 1, 4 H. Watanabe, 4, 1 G.J. Lane, M. Ahmed, 1, † M. Brunet, T. Hashimoto, S. Ishizawa, 1, 4 S. Kimura, F.G. Kondev, Yu. A. Litvinov, H. Miyatake, ## References SHOWING 1-10 OF 13 REFERENCES Survival of Nature's Rarest Isotope Ta-180 under Stellar Conditions • Physics • 2007 The nucleosynthesis of nature's rarest isotope {sup 180}Ta depends sensitively on the temperature of the astrophysical environment because of depopulation of the long-living isomeric state via Underground search for the decay of Ta-180(m) • Physics • 2006 Tantalum-180m is a very rare primordial isotope and is not in its nuclear ground state. The radioactivity of Ta180m has not yet been observed. Previous attempts to measure the half-life of Ta180m NATURAL RADIOACTIVITY OF V$sup 50$AND Ta$sup 18sup 0\$
• Physics
• 1958
The methods of proportional counter and scintillation spectroscopy have been used to examine thc possible radioactivity of the naturally occurring nuclides V/sup 50/ and Ta/sup 180/. Some positive
Search for the decay of 180Tam.
• Physics
Physical review. C, Nuclear physics
• 1985
A sample of Ta/sub 2/O/sub 5/ containing 151 mg of Ta enriched to 5.47% in /sup 180/Ta/sup m/ was counted in a well-type high-purity Ge detector. This was enclosed in a large NaI(Tl) detector
Search for the radioactivity of 180mTa using an underground HPGe sandwich spectrometer.
• Geology
Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
• 2009
Half-life ofTa180
A search has been made for ..gamma.. rays emitted following the electron-capture and/or ..beta../sup -/ decay of /sup 180/Ta. No excess of counts above background was observed in the vicinity of any
BAT – The Bayesian Analysis Toolkit
• Computer Science
Comput. Phys. Commun.
• 2009
The Bayesian Analysis Toolkit, BAT, is a tool developed to evaluate the posterior probability distribution for models and their parameters that is centered around Bayes' Theorem and is realized with the use of Markov Chain Monte Carlo giving access to the full posterior probabilities.