Magnetic dipole excitations of Cr 50

Published

Journal Article

© 2016 American Physical Society. The low-lying M1 strength of the open-shell nucleus Cr50 has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity γ-ray Source (HIγS) facility between 6 and 9.7 MeV of the initial photon energy. Fifteen 1+ states have been observed between 3.6 and 9.7 MeV. Following our analysis the lowest 1+ state at 3.6 MeV can be considered as an isovector orbital mode with some spin admixture. The obtained results generally match the estimations and trends typical for the scissors-like mode. Detailed calculations within the Skyrme quasiparticle random-phase-approximation method and the large-scale shell model justify our conclusions. The calculated distributions of the orbital current for the lowest 1+-state suggest the schematic view of Lipparini and Stringari (isovector rotation-like oscillations inside the rigid surface) rather than the scissors-like picture of Lo Iudice and Palumbo. The spin M1 resonance is shown to be mainly generated by spin-flip transitions between the orbitals of the fp shell.

Full Text

Duke Authors

Cited Authors

  • Pai, H; Beck, T; Beller, J; Beyer, R; Bhike, M; Derya, V; Gayer, U; Isaak, J; Krishichayan, ; Kvasil, J; Löher, B; Nesterenko, VO; Pietralla, N; Martínez-Pinedo, G; Mertes, L; Ponomarev, VY; Reinhard, PG; Repko, A; Ries, PC; Romig, C; Savran, D; Schwengner, R; Tornow, W; Werner, V; Wilhelmy, J; Zilges, A; Zweidinger, M

Published Date

  • January 25, 2016

Published In

Volume / Issue

  • 93 / 1

Electronic International Standard Serial Number (EISSN)

  • 2469-9993

International Standard Serial Number (ISSN)

  • 2469-9985

Digital Object Identifier (DOI)

  • 10.1103/PhysRevC.93.014318

Citation Source

  • Scopus