Loading…

New collective structures in Au179 and their implications for the triaxial deformation of the Pt178 core

The extremely neutron-deficient isotope 179Au has been studied by a combination of in-beam γ-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/2–, T1/2 = 328 ns isomer. A new rotational band, associated with the unfavor...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. C 2022-12, Vol.106 (6)
Main Authors: Balogh, M., Jajčišinová, E., Venhart, M., Herzáň, A., Wood, J. L., Joss, D. T., Ali, F. A., Auranen, K., Bánovská, S., Bírová, M., Carroll, R. J., Cox, D. M., Cubiss, J. G., Davis, T., Drummond, M. C., Greenlees, P. T., Grahn, T., Gredley, A., Henderson, J., Jakobsson, U., Julin, R., Juutinen, S., Kantay, G., Konki, J., Konopka, P., Leino, M., Matoušek, V., Mistry, A. K., McPeake, C. G., O'Donnell, D., Page, R. D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Saygı, B., Sedlák, M., Seweryniak, D., Scholey, C., Sorri, J., Špaček, A., Stolze, S., Taylor, M., Thornthwaite, A., Uusitalo, J., Veselský, M., Vielhauer, S., Wearing, F. P.
Format: Article
Language:English
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The extremely neutron-deficient isotope 179Au has been studied by a combination of in-beam γ-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/2–, T1/2 = 328 ns isomer. A new rotational band, associated with the unfavored signature band of the 1⁢ℎ9/2⊕2f⁢7/2 proton-intruder configuration, was revealed. A previously unknown, high-spin isomeric state with an excitation energy of 1743(17) keV and T1/2 = 2.16⁢(8) ⁢µs was discovered. Five decay paths were identified, some of them feeding previously unknown non-yrast excited states, associated with the 1⁢i13/2 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⁢ℎ9/2⊕2f7/2 rotational band is interpreted as due to triaxial deformation of the underlying configuration with β2 ≈ 0.26 and γ ≈ 27°. In conclusion, observed non-yrast states of the positive-parity 1i13/2 intruder configuration are interpreted as due to triaxial deformation with β2 ≈ 0.26 and γ ≈ 20°.
ISSN:2469-9985