Precision mass measurements in the zirconium region pin down the mass surface across the neutron midshell at N = 66
Hukkanen, M., Ryssens, W., Ascher, P., Bender, M., Eronen, T., Grévy, S., Kankainen, A., Stryjczyk, M., Beliuskina, O., Ge, Z., Geldhof, S., Gerbaux, M., Gins, W., Husson, A., Nesterenko, D.A., Raggio, A., Reponen, M., Rinta-Antila, S., Romero, J., . . . Zadvornaya, A. (2024). Precision mass measurements in the zirconium region pin down the mass surface across the neutron midshell at N = 66. Physics Letters B, 856, Article 138916. https://doi.org/10.1016/j.physletb.2024.138916
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Physics Letters BDate
2024Copyright
© 2024 the Authors
Precision mass measurements of 104Y, 106Zr, 104,104𝑚,109Nb, and 111,112Mo have been performed with the JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line facility. The order of the long lived states in 104Nb was unambiguously established. The trend in two-neutron separation energies around the 𝑁 = 66 neutron midshell appeared to be steeper with respect to the Atomic Mass Evaluation 2020 extrapolations for the 39Y and 40Zr isotopic chains and less steep for the 41Nb chain, indicating a possible gap opening around 𝑍 = 40. The experimental results were compared to the BSkG2 model calculations performed with and without vibrational and rotational corrections. All of them predict two low-lying minima for 106Zr. While the unaltered BSkG2 model fails to predict the trend in two-neutron separation energies, selecting the more deformed minima in calculations and removing the vibrational correction, the calculations are more in line with experimental data. The same is also true for the 2+ 1 excitation energies and differences in charge radii in the Zr isotopes. The results stress the importance of improved treatment of collective corrections in large-scale models and further development of beyond-mean-field techniques.
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https://converis.jyu.fi/converis/portal/detail/Publication/233268012
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Research Council of Finland; European CommissionFunding program(s)
Academy Research Fellow, AoF; Research costs of Academy Research Fellow, AoF; Academy Project, AoF; ERC Consolidator Grant; MSCA Innovative Training Networks (ITN)
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
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The present research benefited from computational resources made available on the Tier-1 supercomputer of the Fédération Wallonie-Bruxelles, infrastructure funded by The Walloon Region under the grant agreement No. 1117545. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreements No. 771036 (ERC CoG MAIDEN) and No. 861198–LISA–H2020-MSCA-ITN-2019 and the Academy of Finland projects No. 295207, 306980, 327629, 354968 and 354589. W.R. is a Research associate of the F.R.S.-FNRS (Belgium). Work by M.B. has been supported by the Agence Nationale de la Recherche, France, Grant No. 19-CE31-0015-01 (NEWFUN). We are grateful for the mobility support from Projet International de Coopération Scientifique Manipulation of Ions in Traps and Ion sourCes for Atomic and Nuclear Spectroscopy (MITICANS) of NRS. ...License
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