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- W4387613245 abstract "Abstract $$^{180textrm{m}}text {Ta}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>180</mml:mn> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Ta</mml:mtext> </mml:mrow> </mml:math> is the longest-lived metastable state presently known. Its decay has not been observed yet. In this work, we report a new result on the decay of $$^{180textrm{m}}text {Ta}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>180</mml:mn> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Ta</mml:mtext> </mml:mrow> </mml:math> obtained with a 2015.12-g tantalum sample measured for 527.7 d with an ultra-low background HPGe detector in the STELLA laboratory of the Laboratori Nazionali del Gran Sasso (LNGS), in Italy. Before the measurement, the sample has been stored deep-underground for ten years, resulting in subdominant background contributions from cosmogenically activated $$^{182}text {Ta}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>182</mml:mn> </mml:msup> <mml:mtext>Ta</mml:mtext> </mml:mrow> </mml:math> . We observe no signal in the regions of interest and set half-life limits on the process for the two channels EC and $$beta ^-$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>β</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:math> : $$T_{1/2,~textrm{EC}}> 1.6 times 10^{18}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> <mml:mspace /> <mml:mtext>EC</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>></mml:mo> <mml:mn>1.6</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>18</mml:mn> </mml:msup> </mml:mrow> </mml:math> year and $$T_{1/2,~beta ^-}> 1.1times 10^{18}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> <mml:mspace /> <mml:msup> <mml:mi>β</mml:mi> <mml:mo>-</mml:mo> </mml:msup> </mml:mrow> </mml:msub> <mml:mo>></mml:mo> <mml:mn>1.1</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>18</mml:mn> </mml:msup> </mml:mrow> </mml:math> year (90% C. I.), respectively. We also set the limit on the $$gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>γ</mml:mi> </mml:math> de-excitation / IC channel: $$T_{1/2,~textrm{IC}}> 4.1 times 10^{15}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>T</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> <mml:mn>2</mml:mn> <mml:mo>,</mml:mo> <mml:mspace /> <mml:mtext>IC</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>></mml:mo> <mml:mn>4.1</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>15</mml:mn> </mml:msup> </mml:mrow> </mml:math> year (90% C. I.). These are, as of now, the most stringent bounds on the decay of $$^{180textrm{m}}text {Ta}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>180</mml:mn> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Ta</mml:mtext> </mml:mrow> </mml:math> worldwide. Finally, we test the hypothetical scenarios of de-excitation of $$^{180textrm{m}}text {Ta}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>180</mml:mn> <mml:mtext>m</mml:mtext> </mml:mrow> </mml:msup> <mml:mtext>Ta</mml:mtext> </mml:mrow> </mml:math> by cosmological Dark Matter and constrain new parameter space for strongly-interacting dark-matter particle with mass up to $$10^5$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>5</mml:mn> </mml:msup> </mml:math> GeV." @default.
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- W4387613245 date "2023-10-13" @default.
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- W4387613245 title "Deep-underground search for the decay of $$^{180textrm{m}}text {Ta}$$ with an ultra-low-background HPGe detector" @default.
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