University of Oulu

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).

In-beam γ-ray and electron spectroscopy of ²⁴⁹,²⁵¹Md

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Author: Briselet, R.1; Theisen, Ch1; Sulignano, B.1;
Organizations: 1Univ Paris Saclay, CEA, Irfu, F-91191 Gif Sur Yvette, France.
2Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.
3Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
4Lund Univ, Box 118, S-22100 Lund, Sweden.
5Inst Pluridisciplinaire Hubert Curien, F-67037 Strasbourg, France.
6Univ Paris Saclay, IJCLab, CNRS, IN2P3, F-91405 Orsay, France.
7Slovak Acad Sci, Inst Phys, SK-84511 Bratislava, Slovakia.
8Univ Helsinki, Lab Radiochem, Dept Chem, POB 55, FI-00014 Helsinki, Finland.
9CERN, CH-1211 Geneva 23, Switzerland.
10GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany.
11Fortum Oyj, Power Div, POB 100, Fortum 00048, Finland.
12STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England.
13IAEA, Vienna, Austria.
14Mfg Technol Ctr, Pilot Way, Ansty CV7 9JU, England.
15Univ Oulu, Sodankyla Geophys Observ, Oulu 90014, Finland.
16Argonne Natl Lab, Div Phys, 9700 South Cass Ave, Lemont, IL 60439 USA.
17Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain.
18Univ Claude Bernard Lyon 1, IP2I Lyon, CNRS, IN2P3, F-69622 Villeurbanne, France.
19Yale Univ, Ctr Theoret Phys, Sloane Phys Lab, New Haven, CT 06520 USA.
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
Persistent link:
Language: English
Published: American Physical Society, 2020
Publish Date: 2021-02-17


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 γγ 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 \(g_{K}=0.69^{+0.19}_{−0.16}\) 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 Δlj=3 [521]3/2⁻ and [633]7/2⁺ Nilsson orbitals were found in both ²⁴⁹,²⁵¹Md. A surprising similarity of the²⁵¹Md 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.

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Series: Physical review. C
ISSN: 2469-9985
ISSN-E: 2469-9993
ISSN-L: 2469-9985
Volume: 102
Article number: 014307
DOI: 10.1103/PhysRevC.102.014307
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: Support has been provided by the EU 7th Framework Programme Integrating Activities—Transnational Access Project No. 262010 (ENSAR), by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL, Contract No. 213503), and by the UK STFC.
Copyright information: © 2020 American Physical Society.