Fine structure in the $$\upalpha $$ decay of $$^{179}$$Hg and $$^{177}$$Au

The <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> -decay fine structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au was studied by means of decay spectroscopy. Two experiments were performed at the Accelerator Laboratory of the University of Jyväskylä (JYFL), Finland, utilizing the recoil separator RITU and a digital data acquisition system. The heavy-ion induced fusion-evaporation reactions <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>36</mml:mn> <mml:mn>82</mml:mn></mml:mmultiscripts> </mml:math> Kr + <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>44</mml:mn> <mml:mn>100</mml:mn></mml:mmultiscripts> </mml:math> Ru and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>38</mml:mn> <mml:mn>88</mml:mn></mml:mmultiscripts> </mml:math> Kr + <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>42</mml:mn> <mml:mn>92</mml:mn></mml:mmultiscripts> </mml:math> Mo were used to produce the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>α</mml:mi> <mml:mn>1</mml:mn></mml:msub> </mml:math> - <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>α</mml:mi> <mml:mn>2</mml:mn></mml:msub> </mml:math> correlations and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> - <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math> coincidences, a new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decay with E <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mi>α</mml:mi> <mml:mrow></mml:mrow></mml:mmultiscripts> </mml:math> = 6156(10) keV was observed from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg. This decay populates the (9/2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mo>-</mml:mo></mml:mmultiscripts> </mml:math> ) excited state at an excitation energy of 131.3(5) keV in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>175</mml:mn></mml:mmultiscripts> </mml:math> Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au nucleus, a new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decay with E <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mi>α</mml:mi> <mml:mrow></mml:mrow></mml:mmultiscripts> </mml:math> = 5998(9) keV was observed to populate the 156.1(6) keV excited state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>173</mml:mn></mml:mmultiscripts> </mml:math> Ir. Two de-excitation paths were observed from this excited state. Moreover, a new 215.7(13) keV transition was observed to depopulate the 424.4(13) keV excited state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>173</mml:mn></mml:mmultiscripts> </mml:math> Ir. Properties of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>J</mml:mi> <mml:mi>π</mml:mi></mml:msup> </mml:math> ) are presented without brackets throughout the text.

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Publication Details

Journal
The European Physical Journal A
Published
2025-03-07
DOI
https://doi.org/10.1140/epja/s10050-025-01513-9
Citations
1
Primary Topic
Nuclear physics research studies
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article
Field-Weighted Citation Impact
1.87

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article

Fine structure in the $$\upalpha $$ decay of $$^{179}$$Hg and $$^{177}$$Au

A. Špaček, J. Sorri, M. Venhart, S. Bánovská et al.
1 citations
The European Physical Journal A
Nuclear physics research studies
1.87
article

Fine structure in the $$\upalpha $$ decay of $$^{179}$$Hg and $$^{177}$$Au

A. Špaček, J. Sorri, M. Venhart, S. Bánovská, J. Uusitalo, E. A. Lawrie, P. Papadakis, J. Partanen, G. Kantay, D. T. Joss, U. Jakobsson, A. Gredley, M. C. Drummond, J. Kliman, Michael P. Balogh, D. O’Donnell, A. N. Andreyev, D. Seweryniak, D. M. Cox, A. Mistry, F. Wearing, V. Matoušek, J. G. Cubiss, A. Herzáň, C. McPeake, J. Henderson, K. Auranen, P. T. Greenlees, A. Repko, J. Sarén, P. Rahkila, M. Sedlák, P. Ruotsalainen, I. S. Timchenko, T. Davis, R. Carroll, Farida A. Ali, R. D. Page, C. Scholey, S. Vielhauer, A. Thornthwaite, M. Leino, R. Julin, T. Grahn, B. Sayğı, J. Pakarinen, P. Peura, M. Veselský, S. Stolze, J. L. Easton, S. Juutinen, M. Sandzelius, J. Konki
article en
1 citations

Abstract

The <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> -decay fine structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au was studied by means of decay spectroscopy. Two experiments were performed at the Accelerator Laboratory of the University of Jyväskylä (JYFL), Finland, utilizing the recoil separator RITU and a digital data acquisition system. The heavy-ion induced fusion-evaporation reactions <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>36</mml:mn> <mml:mn>82</mml:mn></mml:mmultiscripts> </mml:math> Kr + <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>44</mml:mn> <mml:mn>100</mml:mn></mml:mmultiscripts> </mml:math> Ru and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>38</mml:mn> <mml:mn>88</mml:mn></mml:mmultiscripts> </mml:math> Kr + <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mn>42</mml:mn> <mml:mn>92</mml:mn></mml:mmultiscripts> </mml:math> Mo were used to produce the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>α</mml:mi> <mml:mn>1</mml:mn></mml:msub> </mml:math> - <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>α</mml:mi> <mml:mn>2</mml:mn></mml:msub> </mml:math> correlations and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> - <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math> coincidences, a new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decay with E <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mi>α</mml:mi> <mml:mrow></mml:mrow></mml:mmultiscripts> </mml:math> = 6156(10) keV was observed from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg. This decay populates the (9/2 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mo>-</mml:mo></mml:mmultiscripts> </mml:math> ) excited state at an excitation energy of 131.3(5) keV in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>175</mml:mn></mml:mmultiscripts> </mml:math> Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au nucleus, a new <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decay with E <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mi>α</mml:mi> <mml:mrow></mml:mrow></mml:mmultiscripts> </mml:math> = 5998(9) keV was observed to populate the 156.1(6) keV excited state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>173</mml:mn></mml:mmultiscripts> </mml:math> Ir. Two de-excitation paths were observed from this excited state. Moreover, a new 215.7(13) keV transition was observed to depopulate the 424.4(13) keV excited state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>173</mml:mn></mml:mmultiscripts> </mml:math> Ir. Properties of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>179</mml:mn></mml:mmultiscripts> </mml:math> Hg and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>177</mml:mn></mml:mmultiscripts> </mml:math> Au <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>J</mml:mi> <mml:mi>π</mml:mi></mml:msup> </mml:math> ) are presented without brackets throughout the text.

The European Physical Journal AVol. 61(3)
Sakarya University (TR), Japan Atomic Energy Agency (JP), Argonne National Laboratory (US), University of Helsinki (FI), University of Liverpool (GB), Institute of Chemistry of the Slovak Academy of Sciences (SK), Slovak Academy of Sciences (SK), Helsinki Institute of Physics (FI), Daresbury Laboratory (GB), Ege University (TR), iThemba Laboratory (ZA), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT), Advanced Science Research Center (JP), Institute of Physics of the Slovak Academy of Sciences (SK), Czech Technical University in Prague (CZ), University of Warsaw (PL), University of York (GB), University of Sulaimani (IQ), European Organization for Nuclear Research (CH), Radiation and Nuclear Safety Authority (FI), University of the West of Scotland (GB), University of the Western Cape (ZA), University of Jyväskylä (FI)
Academy of Finland, Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky, Jyväskylän Yliopisto, Agentúra na Podporu Výskumu a Vývoja, Vedecká Grantová Agentúra MŠVVaŠ SR a SAV, Science and Technology Facilities Council, European Research Council, FP7 Ideas: European Research Council
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Nuclear physics research studies
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