Prolate-Spherical Shape Coexistence at N=28 in $^{44}$S
C. Force, S. Grévy, L. Gaudefroy, O. Sorlin, L. Caceres, F. Rotaru, J. Mrazek, N. L. Achouri, J. C. Angélique, F. Azaiez, B. Bastin, R. Borcea, A. Buta, J. M. D… 展开作者
C. Force, S. Grévy, L. Gaudefroy, O. Sorlin, L. Caceres, F. Rotaru, J. Mrazek, N. L. Achouri, J. C. Angélique, F. Azaiez, B. Bastin, R. Borcea, A. Buta, J. M. Daugas, Z. Dlouhy, Zs. Dombradi, F. De Oliveira, F. Negoita, Y. Penionzhkevich, M. G. Saint-Laurent, D. Sohler, M. Stanoiu, I. Stefan, C. Stodel, F. Nowacki
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5 pages, 3 figures, accepted for publication in Physical Review Letters
The structure of $^{44}$S has been studied using delayed $γ$ and electron spectroscopy at \textsc{ganil}. The decay rates of the 0$^+_2$ isomeric state to the 2$^+_1$ and 0$^+_1$ states have been measured for the first time, leading to a reduced transition probability B(E2~:~2$^{+}_1$$\rightarrow$0$^{+}_2)$= 8.4(26)~e$^2$fm$^4$ and a monopole strength $ρ^2$(E0~:~0$^{+}_2$$\rightarrow$0$^{+}_1)$ =~8.7(7)$\times$10$^{-3}$. Comparisons to shell model calculations point towards prolate-spherical shape coexistence and a phenomenological two level mixing model is used to extract a weak mixing between the two configurations.
Multireference covariant density functional theory for shape coexistence and isomerism in $^{43}$S
School of Physics and Astronomy, Sun Yat-sen University(中山大学物理学院);College of Physics and Communication Electronics, Jiangxi Normal University(江西师范大学物理与通信电子学院);Jiangxi Provincial Key Laboratory of Advanced Electronic Materials and Devices(江西省先进电子材料与器件重点实验室);College of Physics and Electronic Engineering, Chongqing Normal University(重庆师范大学物理与电子工程学院);Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing, Sun Yat-Sen University(中山大学广东省量子计量与传感重点实验室);Physik Department, Technische Universität München(慕尼黑工业大学物理系)
Double shape quantum phase transitions in the SU3-IBM: new $γ$-soft phase and the shape phase transition from the new $γ$-soft phase to the prolate shape
Exclusive cross sections for the $^{43}$P$(-1p)^{42}$Si reaction to the lowest $0^+$ and $2^+$ states, measured at NSCL with GRETINA and the S800, are interpreted in terms of a two-level mixing (collective) model of oblate and prolate co-existing shapes. Using the formalism developed for deformed nuclei we calculate the spectroscopic amplitudes and exclusive cross-sections in the strong coupling limit, where for $^{43}$P the schematic wavefunction includes the coupling of the Nilsson [211]$\frac{1}{2}$ proton orbit. Good agreement with the experimental data is obtained when the amplitude of th…
The low-spin structure of the semimagic 64Ni nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N = 40 subshell gap highli…