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 Saygi; 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 of¹⁷⁹Hg 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 Saygi, D Seweryniak, C Scholey, J Sorri, S Stolze, A Thornthwaite, I S Timchenko, J Uusitalo, M Veselský, S Vielhauer, F P Wearing

Physics

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Abstract

The α -decay fine structure of 179 Hg and 177 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 36 82 Kr + 44 100 Ru and 38 88 Kr + 42 92 Mo were used to produce the 179 Hg and 177 Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- α 1 - α 2 correlations and α - γ coincidences, a new α decay with E α = 6156(10) keV was observed from 179 Hg. This decay populates the (9/2 - ) excited state at an excitation energy of 131.3(5) keV in 175 Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177 Au nucleus, a new α decay with E α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173 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 173 Ir. Properties of the 179 Hg and 177 Au 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	European Physical Journal A : Hadrons and Nuclei
Volume	61
Issue number	3
DOIs	https://doi.org/10.1140/epja/s10050-025-01513-9
Publication status	Published - 7 Mar 2025

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s10050-025-01513-9
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Nuclear Physics Consolidated Grant 2024-2027
Jenkins, D. (Principal investigator), Andreyev, A. (Co-investigator), Bashkanov, M. (Co-investigator), Bentley, M. (Co-investigator), Diget, C. A. (Co-investigator), Dobaczewski, J. J. (Co-investigator), Laird, A. M. (Co-investigator), Paschalis, S. (Co-investigator), Petri, M. (Co-investigator), Wadsworth, R. (Co-investigator), Watts, D. (Co-investigator) & Zachariou, N. (Co-investigator)
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/10/24 → 30/09/27
Project: Research project (funded) › Research
Nuclear Physics Consolidated Grant 2021-2024
Jenkins, D. (Principal investigator), Andreyev, A. (Co-investigator), Bashkanov, M. (Co-investigator), Bentley, M. (Co-investigator), Dobaczewski, J. J. (Co-investigator), Laird, A. M. (Co-investigator), Paschalis, S. (Co-investigator), Pastore, A. (Co-investigator), Petri, M. (Co-investigator), Wadsworth, R. (Co-investigator), Watts, D. (Co-investigator) & Zachariou, N. (Co-investigator)
SCIENCE AND TECHNOLOGY FACILITIES COUNCIL (STFC)
1/10/21 → 31/03/25
Project: Research project (funded) › Research

Cite this

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 of¹⁷⁹Hg and ¹⁷⁷Au. European Physical Journal A : Hadrons and Nuclei, 61(3), Article 43. https://doi.org/10.1140/epja/s10050-025-01513-9

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

abstract = "The α -decay fine structure of 179 Hg and 177 Au 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 36 82 Kr + 44 100 Ru and 38 88 Kr + 42 92 Mo were used to produce the 179 Hg and 177 Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- α 1 - α 2 correlations and α - γ coincidences, a new α decay with E α = 6156(10) keV was observed from 179 Hg. This decay populates the (9/2 - ) excited state at an excitation energy of 131.3(5) keV in 175 Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177 Au nucleus, a new α decay with E α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173 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 173 Ir. Properties of the 179 Hg and 177 Au 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. ",

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 Saygi 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}",

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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, Saygi, 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 of¹⁷⁹Hg and ¹⁷⁷Au.', European Physical Journal A : Hadrons and Nuclei, vol. 61, no. 3, 43. https://doi.org/10.1140/epja/s10050-025-01513-9

Fine structure in the α decay of¹⁷⁹Hg and ¹⁷⁷Au. / Špaček, A; Herzáň, A; Sedlák, M et al.
In: European Physical Journal A : Hadrons and Nuclei, Vol. 61, No. 3, 43, 07.03.2025.

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

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 - Saygi, 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 179 Hg and 177 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 36 82 Kr + 44 100 Ru and 38 88 Kr + 42 92 Mo were used to produce the 179 Hg and 177 Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- α 1 - α 2 correlations and α - γ coincidences, a new α decay with E α = 6156(10) keV was observed from 179 Hg. This decay populates the (9/2 - ) excited state at an excitation energy of 131.3(5) keV in 175 Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177 Au nucleus, a new α decay with E α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173 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 173 Ir. Properties of the 179 Hg and 177 Au 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.

AB - The α -decay fine structure of 179 Hg and 177 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 36 82 Kr + 44 100 Ru and 38 88 Kr + 42 92 Mo were used to produce the 179 Hg and 177 Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- α 1 - α 2 correlations and α - γ coincidences, a new α decay with E α = 6156(10) keV was observed from 179 Hg. This decay populates the (9/2 - ) excited state at an excitation energy of 131.3(5) keV in 175 Pt. The internal conversion coefficient for the 131.3(5) keV transition de-exciting this state was measured for the first time. Regarding the 177 Au nucleus, a new α decay with E α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in 173 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 173 Ir. Properties of the 179 Hg and 177 Au 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.

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

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

M3 - Article

C2 - 40062009

SN - 1434-6001

VL - 61

JO - European Physical Journal A : Hadrons and Nuclei

JF - European Physical Journal A : Hadrons and Nuclei

IS - 3

M1 - 43

ER -

Špaček A, Herzáň A, Sedlák M, Venhart M, Ali FA, Andreyev AN et al. Fine structure in the α decay of¹⁷⁹Hg and ¹⁷⁷Au. European Physical Journal A : Hadrons and Nuclei. 2025 Mar 7;61(3):43. doi: 10.1140/epja/s10050-025-01513-9

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

Abstract

Bibliographical note

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Projects

Nuclear Physics Consolidated Grant 2024-2027

Nuclear Physics Consolidated Grant 2021-2024

Cite this

Fine structure in the α decay of¹⁷⁹Hg and ¹⁷⁷Au.