Fine structure in the $$\upalpha $$ decay of $$^{179}$$Hg and $$^{177}$$Au
Makaleler > Tam Makale · 2025
Yazarlar: 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
The European Physical Journal A, Uluslararası, Wos, 2025, cilt 61, ss 43-43
DOI: 10.1140/epja/s10050-025-01513-9
Özet
Abstract The $$\upalpha $$ α -decay fine structure of $$^{179}$$ 179 Hg and $$^{177}$$ 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 $$^{82}_{36}$$ 36 82 Kr + $$^{100}_{44}$$ 44 100 Ru and $$^{88}_{38}$$ 38 88 Kr + $$^{92}_{42}$$ 42 92 Mo were used to produce the $$^{179}$$ 179 Hg and $$^{177}$$ 177 Au nuclei, respectively. Studying the evaporation residues (ER, recoils)- $$\alpha _1$$ α 1 - $$\alpha _2$$ α 2 correlations and $$\upalpha $$ α - $$\gamma $$ γ coincidences, a new $$\upalpha $$ α decay with E $$_\alpha $$ α = 6156(10) keV was observed from $$^{179}$$ 179 Hg. This decay populates the (9/2 $$^-$$ - ) excited state at an excitation energy of 131.3(5) keV in $$^{175}$$ 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 $$^{177}$$ 177 Au nucleus, a new $$\upalpha $$ α decay with E $$_\alpha $$ α = 5998(9) keV was observed to populate the 156.1(6) keV excited state in