Search for evidence of rotational cluster bands in O-18

Pirrie, S.; Wheldon, C.; Kokalova, Tz; Bishop, J.; Faestermann, Th; Hertenberger, R.; Wirth, H-F; Bailey, S.; Curtis, N.; Dell'Aquila, D.; Mengoni, D.; Smith, R.; Torresi, D. und Turner, A. (2020): Search for evidence of rotational cluster bands in O-18. In: Physical Review C, Bd. 102, Nr. 6, 064315

Abstract

Clustering in O-18 is of great interest to the nuclear physics community, due to theoretical predictions of core+alpha and nuclear molecular structures. An experiment was performed in order to measure branching ratios for states in O-18, determining the tendency towards clustering based on the value of Gamma(alpha)/Gamma(tot) 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 gamma decay, alpha 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 alpha(0) branch. The measurements represent, for several states, either the first branching ratio measurement or the first determination of Gamma(alpha)/Gamma(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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2469-9985
• Sprache: Englisch