Search for evidence of rotational cluster bands in 18O

S. Pirrie; C. Wheldon; Tz Kokalova; J. Bishop; Th Faestermann; Ralf Hertenberger; H.-F. Wirth; S. Bailey; N. Curtis; D. Dell'Aquila; D. Mengoni; R. Smith; D. Torresi; A. Turner

doi:10.1103/PhysRevC.102.064315

Search for evidence of rotational cluster bands in ¹⁸O

S. Pirrie, C. Wheldon, Tz Kokalova, J. Bishop, Th Faestermann, Ralf Hertenberger, H.-F. Wirth, S. Bailey, N. Curtis, D. Dell'Aquila, D. Mengoni, R. Smith, D. Torresi, A. Turner

Physics and Astronomy

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

1 Citation (Scopus)

235 Downloads (Pure)

Abstract

Clustering in ¹⁸O is of great interest to the nuclear physics community, due to theoretical predictions of core +α and nuclear molecular structures. An experiment was performed in order to measure branching ratios for states in ¹⁸O, determining the tendency towards clustering based on the value of Γ_α/Γ_tot for each state, and the reduced widths compared to the Wigner limit. An experimental method that enables the measurement of branching ratios for almost all available decay modes, including γ decay, α decay, and n decay, was employed. The method is also sensitive to the population of excited states in daughter nuclei, allowing for more accurate determination of the α₀ branch. The measurements represent, for several states, either the first branching ratio measurement or the first determination of Γ_α/Γ_tot. Based on these measurements, no evidence of consistent cluster structure is seen across any of the bands previously proposed, casting doubt on their existence. Despite this, some states displaying cluster structure are observed.

Original language	English
Article number	064315
Number of pages	8
Journal	Physical Review C
Volume	102
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.102.064315
Publication status	Published - 14 Dec 2020

Bibliographical note

Funding Information:
The authors would like to thank A. Bergmaier for his help loaning equipment during the setup of the experiment, as well as the operators of the Van de Graaff Tandem accelerator at the Maier-Leibnitz Laboratory in Munich for providing and maintaining the beam. This work was funded by the UK Science and Technology Facilities Council (STFC) under Grant Nos. ST/L005751/1 and ST/P004199/1, and by the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreement No. 65F9744.

Publisher Copyright:
© 2020 American Physical Society.

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Cite this

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title = "Search for evidence of rotational cluster bands in 18O",

abstract = "Clustering in 18O is of great interest to the nuclear physics community, due to theoretical predictions of core +α and nuclear molecular structures. An experiment was performed in order to measure branching ratios for states in 18O, determining the tendency towards clustering based on the value of Γα/Γtot for each state, and the reduced widths compared to the Wigner limit. An experimental method that enables the measurement of branching ratios for almost all available decay modes, including γ decay, α decay, and n decay, was employed. The method is also sensitive to the population of excited states in daughter nuclei, allowing for more accurate determination of the α0 branch. The measurements represent, for several states, either the first branching ratio measurement or the first determination of Γα/Γtot. Based on these measurements, no evidence of consistent cluster structure is seen across any of the bands previously proposed, casting doubt on their existence. Despite this, some states displaying cluster structure are observed.",

author = "S. Pirrie and C. Wheldon and Tz Kokalova and J. Bishop and Th Faestermann and Ralf Hertenberger and H.-F. Wirth and S. Bailey and N. Curtis and D. Dell'Aquila and D. Mengoni and R. Smith and D. Torresi and A. Turner",

note = "Funding Information: The authors would like to thank A. Bergmaier for his help loaning equipment during the setup of the experiment, as well as the operators of the Van de Graaff Tandem accelerator at the Maier-Leibnitz Laboratory in Munich for providing and maintaining the beam. This work was funded by the UK Science and Technology Facilities Council (STFC) under Grant Nos. ST/L005751/1 and ST/P004199/1, and by the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie Grant Agreement No. 65F9744. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

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AU - Pirrie, S.

AU - Wheldon, C.

AU - Kokalova, Tz

AU - Bishop, J.

AU - Faestermann, Th

AU - Hertenberger, Ralf

AU - Wirth, H.-F.

AU - Bailey, S.

AU - Curtis, N.

AU - Dell'Aquila, D.

AU - Mengoni, D.

AU - Smith, R.

AU - Torresi, D.

AU - Turner, A.

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