New collective structures in Au179 and their implications for the triaxial deformation of the Pt178 core
Makaleler > Tam Makale · 2022
Yazarlar: M. Balogh, E. Jajčišinová, M. Venhart, A. Herzáň, J. L. Wood, D. T. Joss, F. A. Ali, K. Auranen, S. Bánovská, M. Bírová, R. J. Carroll, D. M. Cox, J. G. Cubiss, T. Davis, M. C. Drummond, P. T. Greenlees, T. Grahn, A. Gredley, J. Henderson, U. Jakobsson, R. Julin, S. Juutinen, G. Kantay, J. Konki, P. Konopka, 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, P. Ruotsalainen, M. Sandzelius, J. Sarén, B. Saygı, M. Sedlák, D. Seweryniak, C. Scholey, J. Sorri, A. Špaček, S. Stolze, M. Taylor, A. Thornthwaite, J. Uusitalo, M. Veselský, S. Vielhauer, F. P. Wearing
Physical Review C, Uluslararası, Wos, 2022, cilt 106
DOI: 10.1103/physrevc.106.064324
Özet
The extremely neutron-deficient isotope $^{179}\mathrm{Au}$ has been studied by a combination of in-beam $\ensuremath{\gamma}$-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/${2}^{\ensuremath{-}}, {T}_{1/2}=328$ ns isomer. A new rotational band, associated with the unfavored signature band of the $1{h}_{9/2}\ensuremath{\bigoplus}2{f}_{7/2}$ proton-intruder configuration, was revealed. A previously unknown, high-spin isomeric state with an excitation energy of 1743(17) keV and ${T}_{1/2}=2.16(8)\phantom{\rule{4pt}{0ex}}\mathrm{\textmu{}s}$ was discovered. Five decay paths were identified, some of them feeding previously unknown non-yrast excited states, associated with the $1{i}_{13/2}$ proton-intruder configuration. Calculations based on the particle-plus-triaxial-rotor model were performed to interpret the data. On the basis of these calculations, the new $1{h}_{9/2}\ensuremath{\bigoplus}2{f}_{7/2}$ rotational band is interpreted as due to triaxial deformation of the underlying configuration with ${\ensuremath{\beta}}_{2}\ensuremath{\approx}0.26$ and $\ensuremath{\gamma}\ensuremath{\approx}{27}^{\ensuremath{\circ}}$. Observed non-yrast states of the positive-parity $1{i}_{13/2}$ intruder configuration are interpreted as due to triaxial deformation with ${\ensuremath{\beta}}_{2}\ensuremath{\approx}0.26$ and $\ensuremath{\gamma}\ensuremath{\approx}{20}^{\ensuremath{\circ}}$.