β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain

Stryjczyk, M.; Tsunoda, Y.; Darby, I. G.; De Witte, H.; Diriken, J.; Fedorov, D. V.; Fedosseev, V. N.; Fraile, L. M.; Huyse, M.; Köster, U.; Marsh, B. A.; Otsuka, T.; Pauwels, D.; Popescu, L.; Radulov, D.; Seliverstov, M. D.; Sjödin, A. M.; Van den Bergh, P.; Van Duppen, P.; Venhart, M.; Walters, W. B.; Wimmer, K.

doi:10.1103/PhysRevC.98.064326

Title: $β^{-}$ decay study of the ${}^{66}{Mn} − {}^{66}{Fe} − {}^{66}{Co} − {}^{66}{Ni}$ decay chain

Journal Article · Fri Dec 28 00:00:00 EST 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.064326· OSTI ID:1489067

Stryjczyk, M.; Tsunoda, Y.; Darby, I. G.; De Witte, H.; Diriken, J.; Fedorov, D. V.; Fedosseev, V. N.; Fraile, L. M.; Huyse, M.; Köster, U.; Marsh, B. A.; Otsuka, T.; Pauwels, D.; Popescu, L.; Radulov, D.; Seliverstov, M. D.; Sjödin, A. M.; Van den Bergh, P.; Van Duppen, P.; Venhart, M. more »

Here, shell evolution can impact the structure of the nuclei and lead to effects such as shape coexistence. The nuclei around ⁶⁸Ni represent an excellent study case, however, spectroscopic information of the neutron-rich, Z < 28 nuclei is limited. The goal is to measure γ-ray transitions in ⁶⁶Fe, ⁶⁶Co, and ⁶⁶Ni populated in the β– decay of ⁶⁶Mn to determine absolute β feedings and relative γ-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 orbital occupancies around Z = 28 and N = 40. The low-energy structures of ^65,66Fe, ⁶⁶Co, and ⁶⁶Ni were studied in the β– decay of 66Mn produced at ISOLDE, CERN. The beam was purified by means of laser resonance ionization and mass separation. The β and γ 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 β-decay half-lives of the nuclei. As a result, the relative small β-decay ground state feeding of ⁶⁶Fe obtained in this work is at variant to the earlier studies. Spin and parity 1+ was assigned to the ⁶⁶Co ground state based on the strong ground-state feeding in the decay of 66Fe as well as in the decay of ⁶⁶Co. Experimental log(ft) values, γ-ray de-excitation 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 ⁶⁶Mn to ⁶⁶Ni chain were proposed. In conclusion, the β-decay chain starting ⁶⁶Mn toward ⁶⁶Ni, crossing N = 40, evolves from deformed nuclei to sphericity. The β-decay population of a selected number of 0+ and 2+ states in ⁶⁶Ni, which is understood within shape coexistence framework of Monte Carlo shell model calculations, reveals the crucial role of the neutron 0g_9/2 shell and proton excitations across the Z = 28 gap.

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Research Organization:: KU Leuven, Leuven (Belgium)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-94ER40834

OSTI ID:: 1489067

Alternate ID(s):: OSTI ID: 1489042

Journal Information:: Physical Review C, Journal Name: Physical Review C Vol. 98 Journal Issue: 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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