Publication: New insights into triaxiality and shape coexistence from odd-mass Rh-109
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2018-12-20
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American Physical Society
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Abstract
Rapid shape evolutions near A = 100 are now the focus of much attention in nuclear science. Much of the recent work has been centered on isotopes with Z <= 40, where the shapes are observed to transition between near-spherical to highly deformed with only a single pair of neutrons added. At higher Z, the shape transitions become more gradual as triaxiality sets in, yet the coexistence of varying shapes continues to play an important role in the low-energy nuclear structure, particularly in the odd-Z isotopes. This work aims to characterize competing shapes in the triaxial region between Zr and Sn isotopes using ultrafast timing techniques to measure lifetimes of excited states in the neutron-rich nucleus Rh-109. The measurements confirm the persistence at higher Z of similarly large deformations observed near Z = 40. Moreover, we show that new self-consistent mean-field calculations, with proper treatment of the odd nucleon, are able to reproduce the coexisting triaxial and highly deformed configurations revealing, for the first time, the important contribution of the unpaired nucleon to these different shapes based on the blocking of specific single-particle orbitals.
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©2018 American Physical Society. ArtÃculo firmado por 21 autores. The authors acknowledge helpful discussions with C.Y. Wu (LLNL). Figures 2 and 3 were created using the LevelScheme scientific figure preparation system [87]. This project was funded by the National Science Foundation through Grants No. PHY0822648, No. PHY0758100, and No. PHY1419765 and supported by EU 6th Framework program (Integrating Infrastructure Initiative-Transnational Access) Contract No. 506065 (EURONS), the US Department of Energy under Contract No. DE-AC07-05ID14517, the Spanish MINECO via FPA-2015-65035-P, and by the Academy of Finland under the Centre of Excellence Programme 2006-2011 (nuclear- and accelerator-based physics program at JYFL). The work of L.M.R. was partly supported by Spanish MINECO Grants No. FPA2015-65929 and No. FIS2015-63770.