| Article | |
| Report number | arXiv:1812.07510 |
| Title | $\beta^-$ decay study of the $^{66}$Mn $-$ $^{66}$Fe $-$ $^{66}$Co $-$ $^{66}$Ni decay chain |
| Author(s) | Stryjczyk, M. (KU Leuven, Dept. Phys. Astron.) ; Tsunoda, Y. (Tokyo U., CNS) ; Darby, I.G. (KU Leuven, Dept. Phys. Astron.) ; De Witte, H. (KU Leuven, Dept. Phys. Astron.) ; Diriken, J. (KU Leuven, Dept. Phys. Astron.) ; Fedorov, D.V. (St. Petersburg, INP) ; Fedosseev, V.N. (CERN) ; Fraile, L.M. (UCM, Madrid, Dept. Phys.) ; Huyse, M. (KU Leuven, Dept. Phys. Astron.) ; Köster, U. (Laue-Langevin Inst.) ; Marsh, B.A. (CERN) ; Otsuka, T. (Tokyo U., CNS ; Nishina Ctr., RIKEN ; Michigan State U., NSCL ; KU Leuven, Dept. Phys. Astron.) ; Pauwels, D. (KU Leuven, Dept. Phys. Astron.) ; Popescu, L. (SCK-CEN, Mol) ; Radulov, D. (KU Leuven, Dept. Phys. Astron.) ; Seliverstov, M.D. (KU Leuven, Dept. Phys. Astron. ; St. Petersburg, INP ; York U., England) ; Sjödin, A.M. (CERN) ; Van den Bergh, P. (KU Leuven, Dept. Phys. Astron.) ; Van Duppen, P. (KU Leuven, Dept. Phys. Astron.) ; Venhart, M. (KU Leuven, Dept. Phys. Astron. ; Bratislava, Inst. Phys.) ; Walters, W.B. (Maryland U.) ; Wimmer, K. (Tokyo U. ; Munich, Tech. U.) |
| Publication | 2018-12-28 |
| Imprint | 2018-12-18 |
| Number of pages | 21 |
| Note | accepted for publication in PRC |
| In: | Phys. Rev. C 98 (2018) 064326 |
| DOI | 10.1103/PhysRevC.98.064326 (publication) |
| Subject category | nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment |
| Abstract | Background: Shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around $^{68}$Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, $Z<28$ nuclei is limited. Purpose: The goal is to measure $\gamma$-ray transitions in $^{66}$Fe, $^{66}$Co and $^{66}$Ni populated in the $\beta^-$ decay of $^{66}$Mn, to determine absolute $\beta$-feedings and relative $\gamma$-decay probabilities and to compare the results with Monte Carlo Shell Model calculations in order to study the influence of the relevant single neutron and proton orbitals occupancies around $Z=28$ and $N=40$. Method: The low-energy structures of $^{65,66}$Fe, $^{66}$Co and $^{66}$Ni were studied in the $\beta^-$ decay of $^{66}$Mn produced at ISOLDE, CERN. The beam was purified by means of laser resonance ionization and mass separation. The $\beta$ and $\gamma$ events detected by three plastic scintillators and two MiniBall cluster germanium detectors, respectively, were correlated in time to build the low-energy excitation schemes and to determine the $\beta$-decay half-lives of the nuclei. Results: The relative small $\beta$-decay ground state feeding of $^{66}$Fe obtained in this work is at variant to the earlier studies. Spin and parity $1^+$ was assigned to the $^{66}$Co ground state based on the strong ground state feeding in the decay of $^{66}$Fe as well as in the decay of $^{66}$Co. Experimental log(ft) values, $\gamma$-ray deexcitation patterns and energies of excited states were compared to Monte Carlo Shell Model calculations. Based on this comparison, spin and parity assignments for the selected number of low-lying states in the $^{66}$Mn to $^{66}$Ni chain were proposed. Conclusions: The $\beta$-decay chain starting $^{66}$Mn towards $^{66}$Ni, crossing $N=40$, evolves from deformed nuclei to sphericity... |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) Publication: © 2018-2024 authors |
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Record created 2019-01-08, last modified 2024-05-08
