Fine structure in the α decay of 179Hg and 177Au

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

doi:10.1140/epja/s10050-025-01513-9

Fine structure in the α decay of 179Hg and 177Au

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The α -decay fine structure of ¹⁷⁹Hg and ¹⁷⁷Au 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 ⁸²₃₆Kr + ¹⁰⁰₄₄Ru and ⁸⁸₃₈Kr + ⁹²₄₂Mo were used to produce the ¹⁷⁹Hg and ¹⁷⁷Au nuclei, respectively. Studying the evaporation residues (ER, recoils)-α₁ -α₂- correlations and α - γ coincidences, a new α decay with E_α = 6156(10) keV was observed from ¹⁷⁹Hg. This decay populates the (9/2^-) excited state at an excitation energy of 131.3(5) keV in ¹⁷⁵Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the ¹⁷⁷Au nucleus, a new α decay with E_α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in ¹⁷³Ir. 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 ¹⁷³Ir. Properties of the ¹⁷⁹Hg and ¹⁷⁷Au α decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. J^π) are presented without brackets throughout the text.

Original language	English
Article number	43
Number of pages	9
Journal	The European Physical Journal A
Volume	61
DOIs	https://doi.org/10.1140/epja/s10050-025-01513-9
Publication status	Published - 7 Mar 2025

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Špaček, A., Herzáň, A., Sedlák, M., Venhart, M., Ali, F. A., Andreyev, A. N., Auranen, K., Bánovská, S., Balogh, M., Carroll, R. J., Cox, D. M., Cubiss, J. G., Davis, T., Drummond, M. C., Easton, J. L., Grahn, T., Gredley, A., Greenlees, P. T., Henderson, J., ... Wearing, F. P. (2025). Fine structure in the α decay of 179Hg and 177Au. The European Physical Journal A, 61, Article 43. https://doi.org/10.1140/epja/s10050-025-01513-9

@article{804ee9aedf924440a3f115e55fffc732,

title = "Fine structure in the α decay of 179Hg and 177Au",

abstract = "The α -decay fine structure of 179Hg and 177Au was studied by means of decay spectroscopy. Two experiments were performed at the Accelerator Laboratory of the University of Jyv{\"a}skyl{\"a} (JYFL), Finland, utilizing the recoil separator RITU and a digital data acquisition system. The heavy-ion induced fusion-evaporation reactions 8236Kr + 10044Ru and 8838Kr + 9242Mo were used to produce the 179Hg and 177Au nuclei, respectively. Studying the evaporation residues (ER, recoils)-α1 -α2- correlations and α - γ coincidences, a new α decay with Eα = 6156(10) keV was observed from 179Hg. This decay populates the (9/2-) excited state at an excitation energy of 131.3(5) keV in 175Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177Au nucleus, a new α decay with Eα = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173Ir. 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 173Ir. Properties of the 179Hg and 177Au α decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. Jπ) are presented without brackets throughout the text.",

author = "A. {\v S}pa{\v c}ek and A. Herz{\'a}{\v n} and M. Sedl{\'a}k and M. Venhart and Ali, {F. A.} and Andreyev, {A. N.} and K. Auranen and S. B{\'a}novsk{\'a} and M. Balogh and Carroll, {R. J.} and Cox, {D. M.} and Cubiss, {J. G.} and T. Davis and Drummond, {M. C.} and Easton, {J. L.} and T. Grahn and A. Gredley and Greenlees, {P. T.} and J. Henderson and U. Jakobsson and Joss, {D. T.} and R. Julin and S. Juutinen and G. Kantay and J. Kliman and J. Konki and Lawrie, {E. A.} and M. Leino and V. Matou{\v s}ek and Mistry, {A. K.} and McPeake, {C. G.} and D. O'Donnell and Page, {R. D.} and J. Pakarinen and P. Papadakis and J Partanen and P. Peura and P. Rahkila and A. Repko and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and B. Saygı and D. Seweryniak and C. Scholey and J. Sorri and S. Stolze and A. Thornthwaite and Timchenko, {I. S.} and J. Uusitalo and M. Veselsk{\'y} and S. Vielhauer and Wearing, {F. P.}",

year = "2025",

month = mar,

day = "7",

doi = "10.1140/epja/s10050-025-01513-9",

language = "English",

volume = "61",

journal = "The European Physical Journal A",

issn = "1434-6001",

publisher = "Springer",

}

Špaček, A, Herzáň, A, Sedlák, M, Venhart, M, Ali, FA, Andreyev, AN, Auranen, K, Bánovská, S, Balogh, M, Carroll, RJ, Cox, DM, Cubiss, JG, Davis, T, Drummond, MC, Easton, JL, Grahn, T, Gredley, A, Greenlees, PT, Henderson, J, Jakobsson, U, Joss, DT, Julin, R, Juutinen, S, Kantay, G, Kliman, J, Konki, J, Lawrie, EA, Leino, M, Matoušek, V, Mistry, AK, McPeake, CG, O'Donnell, D, Page, RD, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Repko, A, Ruotsalainen, P, Sandzelius, M, Sarén, J, Saygı, B, Seweryniak, D, Scholey, C, Sorri, J, Stolze, S, Thornthwaite, A, Timchenko, IS, Uusitalo, J, Veselský, M, Vielhauer, S & Wearing, FP 2025, 'Fine structure in the α decay of 179Hg and 177Au', The European Physical Journal A, vol. 61, 43. https://doi.org/10.1140/epja/s10050-025-01513-9

TY - JOUR

T1 - Fine structure in the α decay of 179Hg and 177Au

AU - Špaček, A.

AU - Herzáň, A.

AU - Sedlák, M.

AU - Venhart, M.

AU - Ali, F. A.

AU - Andreyev, A. N.

AU - Auranen, K.

AU - Bánovská, S.

AU - Balogh, M.

AU - Carroll, R. J.

AU - Cox, D. M.

AU - Cubiss, J. G.

AU - Davis, T.

AU - Drummond, M. C.

AU - Easton, J. L.

AU - Grahn, T.

AU - Gredley, A.

AU - Greenlees, P. T.

AU - Henderson, J.

AU - Jakobsson, U.

AU - Joss, D. T.

AU - Julin, R.

AU - Juutinen, S.

AU - Kantay, G.

AU - Kliman, J.

AU - Konki, J.

AU - Lawrie, E. A.

AU - Leino, M.

AU - Matoušek, V.

AU - Mistry, A. K.

AU - McPeake, C. G.

AU - O'Donnell, D.

AU - Page, R. D.

AU - Pakarinen, J.

AU - Papadakis, P.

AU - Partanen, J

AU - Peura, P.

AU - Rahkila, P.

AU - Repko, A.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Saygı, B.

AU - Seweryniak, D.

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Thornthwaite, A.

AU - Timchenko, I. S.

AU - Uusitalo, J.

AU - Veselský, M.

AU - Vielhauer, S.

AU - Wearing, F. P.

PY - 2025/3/7

Y1 - 2025/3/7

N2 - The α -decay fine structure of 179Hg and 177Au 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 8236Kr + 10044Ru and 8838Kr + 9242Mo were used to produce the 179Hg and 177Au nuclei, respectively. Studying the evaporation residues (ER, recoils)-α1 -α2- correlations and α - γ coincidences, a new α decay with Eα = 6156(10) keV was observed from 179Hg. This decay populates the (9/2-) excited state at an excitation energy of 131.3(5) keV in 175Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177Au nucleus, a new α decay with Eα = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173Ir. 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 173Ir. Properties of the 179Hg and 177Au α decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. Jπ) are presented without brackets throughout the text.

AB - The α -decay fine structure of 179Hg and 177Au 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 8236Kr + 10044Ru and 8838Kr + 9242Mo were used to produce the 179Hg and 177Au nuclei, respectively. Studying the evaporation residues (ER, recoils)-α1 -α2- correlations and α - γ coincidences, a new α decay with Eα = 6156(10) keV was observed from 179Hg. This decay populates the (9/2-) excited state at an excitation energy of 131.3(5) keV in 175Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177Au nucleus, a new α decay with Eα = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173Ir. 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 173Ir. Properties of the 179Hg and 177Au α decays were examined in a framework of reduced widths and hindrance factors. For clarity and simplicity, the spin and parity assignments (e.g. Jπ) are presented without brackets throughout the text.

U2 - 10.1140/epja/s10050-025-01513-9

DO - 10.1140/epja/s10050-025-01513-9

M3 - Article

SN - 1434-6001

VL - 61

JO - The European Physical Journal A

JF - The European Physical Journal A

M1 - 43

ER -

Fine structure in the α decay of 179Hg and 177Au

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