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Title: β decay study of the Mn 66 Fe 66 Co 66 Ni 66 decay chain

Abstract

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 tomore » 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.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; « less
Publication Date:
Research Org.:
KU Leuven, Leuven (Belgium)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1489067
Alternate Identifier(s):
OSTI ID: 1489042
Grant/Contract Number:  
FG02-94ER40834
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Name: Physical Review C Journal Volume: 98 Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and Wimmer, K. β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.064326.
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. β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain. United States. doi:10.1103/PhysRevC.98.064326.
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., and Wimmer, K. Fri . "β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain". United States. doi:10.1103/PhysRevC.98.064326.
@article{osti_1489067,
title = {β − decay study of the Mn 66 − Fe 66 − Co 66 − Ni 66 decay chain},
author = {Stryjczyk, M. and Tsunoda, Y. and Darby, I. G. and De Witte, H. and Diriken, J. and Fedorov, D. V. and Fedosseev, V. N. and Fraile, L. M. and Huyse, M. and Köster, U. and Marsh, B. A. and Otsuka, T. and Pauwels, D. and Popescu, L. and Radulov, D. and Seliverstov, M. D. and Sjödin, A. M. and Van den Bergh, P. and Van Duppen, P. and Venhart, M. and Walters, W. B. and Wimmer, K.},
abstractNote = {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 0g9/2 shell and proton excitations across the Z = 28 gap.},
doi = {10.1103/PhysRevC.98.064326},
journal = {Physical Review C},
issn = {2469-9985},
number = 6,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
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Publisher's Version of Record at 10.1103/PhysRevC.98.064326

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