A1 Journal article (refereed)
In-beam γ-ray and electron spectroscopy of Md249,251 (2020)

Briselet, R., Theisen, Ch., Sulignano, B., Airiau, M., Auranen, K., Cox, D. M., Déchery, F., Drouart, A., Favier, Z., Gall, B., Goigoux, T., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Herzberg, R.-D., Jakobsson, U., Julin, R., Juutinen, S., . . . Ryssens, W. (2020). In-beam γ-ray and electron spectroscopy of Md249,251. Physical Review C, 102(1), Article 014307. https://doi.org/10.1103/physrevc.102.014307

JYU authors or editors

Publication details

All authors or editors: Briselet, R.; Theisen, Ch.; Sulignano, B.; Airiau, M.; Auranen, K.; Cox, D. M.; Déchery, F.; Drouart, A.; Favier, Z.; Gall, B.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2020

Publication date: 09/07/2020

Volume: 102

Issue number: 1

Article number: 014307

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/physrevc.102.014307

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/71132

Publication is parallel published: https://arxiv.org/abs/2001.10235

Abstract

The odd-Z 251Md nucleus was studied using combined γ-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the [521]1/2− configuration, another rotational structure has been identified using γ−γ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a [514]7/2− single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of ≃60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely gK=0.69+0.19−0.16 for the ground-state band. The odd-Z 249Md was studied using γ-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the Δl=Δj=3 [521]3/2− and [633]7/2+ Nilsson orbitals were found in both 249,251Md. A surprising similarity of the 251Md ground-state band transition energies with those of the excited band of 255Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.

Keywords: nuclear physics; spectroscopy

Free keywords: collective levels; electromagnetic transitions; nuclear spin and parity

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2020

JUFO rating: 2