Direct observation of E0 transitions in 188Pb through in-beam spectroscopy
Papadakis, P., Pakarinen, J., Briscoe, A.D., Cox, D.M., Julin, R., Auranen, K., Grahn, T., Greenlees, P.T., Hadyn̂ska-Klek, K., Herzáň, A., Herzberg, R.-D., Jakobsson, U., Juutinen, S., Konki, J., Leino, M., Mistry, A., O'Donnell, D., Peura, P., Rahkila, P., . . . Wrzosek-Lipska, K. (2024). Direct observation of E0 transitions in 188Pb through in-beam spectroscopy. Physics Letters B, 858, Article 139048. https://doi.org/10.1016/j.physletb.2024.139048
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Physics Letters BAuthors
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2024Copyright
© 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³.
Competing configurations, assigned with three different shapes, are mixed at low angular momentum in the neutron-deficient 188Pb nucleus. Here, we present a simultaneous conversion electron and γ-ray in-beam spectroscopic precision measurement employing the sage spectrometer. The level energy of the first excited state, 0+2, has been determined at 591(1) keV through direct measurement of conversion electrons. By using the intensity of the observed 0+2→0+1 transition to the ground state, the feeding of the 0+2 state has been determined for the first time, which suggests the 0+2state is the head of the predominantly prolate band. The compositions of the 4+2→4+1and 2+2→2+1 inter-band transitions have been determined, indicating configuration mixing between the bands.
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Academy Research Fellow, AoFAdditional information about funding
This work has been supported through the Academy of Finland under the Finnish Centre of Excellence Programme 2012-2017 (Nuclear and Accelerator Based Physics Programme at JYFL), through the Academy Research Fellow funding (contract number 257562) and the European Gamma-Ray Spectroscopy pool. Support from the Science and Technology Facilities Council (UK) and EU 7th framework programme Integrating Activities - Transnational Access, Project No. 262010 (ENSAR) are acknowledged. AH would like to thank the Slovak Research and Development Agency under contract No. APVV-20-0532 and APVV-22-0304, and Slovak grant agency VEGA (Contract No. 2/0175/24). ...License
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