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    Detailed View at Magnetic Dipole Strengths: The Case of Semimagic 50Ti

    B. Kelly1, M. Spieker1,*, U. Friman-Gayer2, L. T. Baby1, T. Beck2,†, A. L. Conley1, S. W. Finch3,4, J. Isaak2, Krishichayan3,4 et al.

    E. Litvinova5, H. Pai2,‡, N. Pietralla2, D. Savran6, W. Tornow3,4, N. Tsoneva7, A. Volya1, and V. Werner2

    • *Contact author: mspieker@fsu.edu
    • †Present address: KU Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200d, 3001 Leuven, Belgium.
    • ‡Present address: Extreme Light Infrastructure Nuclear Physics (ELI-NP), “Horia Hulubei” National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 077125 Bucharest-Magurele, Romania.

    Phys. Rev. Lett. 136, 082502 – Published 24 February, 2026

    DOI: https://doi.org/10.1103/82y9-svrd

    Abstract

    Magnetic dipole, M1, strengths were studied in semimagic Ti50 up to the neutron-separation threshold by combining data from (d,p) one-neutron transfer, (γ,γ′) real-photon scattering, (e,e′) inelastic scattering at extreme backward angles, and (p,p′) at Ep=210  MeV and extreme forward angles. The combination of all probes provided unique access to the neutron spin-flip contribution and the possibility to evaluate its role in generating the spin-flip M1 strengths. The small contribution of the neutron (1f7/2)−1(1f5/2)+1 spin-flip transitions, which were probed with the (d,p) reaction, to the overall strength in Ti50 questions the standard picture for the microscopic origin of spin-flip strength in the fp shell. For Ti50, this Letter shows that Jπ=1+ states with larger neutron (1f7/2)−1(1f5/2)+1 spectroscopic factors do not correspond to the ones with the largest B(M1;01+→1i+) strengths.

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