decays of the isovector giant dipole resonance (IVGDR) of the deformed nucleus were measured using -Smekal-Raman and elastic scattering of linearly polarized, quasimonochromatic photon beams. The two scattering processes were disentangled through their distinct angular distributions. Their branching ratio and cross sections were determined at six excitation energies covering the IVGDR. Both agree with the predictions of the geometrical model for the IVGDR and confirm decay as an observable sensitive to the structure of the resonance. Consequently, the data place strong constraints on the nuclear shape, including the degree of triaxiality. The derived shape parameters and agree well with other measurements and recent Monte Carlo shell-model calculations.
Kleemann, J., Pietralla, N., Friman-Gayer, U., Isaak, J., Papst, O., Prifti, K., Werner, V., Ayangeakaa, A. D., Beck, T., Colò, G., Cortés, M. L., Finch, S. W., Fulghieri, M., Gribble, D., Ide, K. E., James, X. K. -H., Janssens, R. V. F., Johnson, S. R., ... Tornow, W. (2025). Gamma Decay of the <math display='inline'> <mrow> <mmultiscripts> <mrow> <mi>Sm</mi> </mrow> <mprescripts/> <none/> <mrow> <mn>154</mn> </mrow> </mmultiscripts> </mrow> </math> Isovector Giant Dipole Resonance: Smekal-Raman Scattering as a Novel Probe of Nuclear Ground-State Deformation. Physical Review Letters, 134(2). https://doi.org/10.1103/PhysRevLett.134.022503
@article{osti_2500941,
author = {Kleemann, J. and Pietralla, N. and Friman-Gayer, U. and Isaak, J. and Papst, O. and Prifti, K. and Werner, V. and Ayangeakaa, A. D. and Beck, T. and Colò, G. and others},
title = {Gamma Decay of the <math display='inline'> <mrow> <mmultiscripts> <mrow> <mi>Sm</mi> </mrow> <mprescripts/> <none/> <mrow> <mn>154</mn> </mrow> </mmultiscripts> </mrow> </math> Isovector Giant Dipole Resonance: Smekal-Raman Scattering as a Novel Probe of Nuclear Ground-State Deformation},
annote = { γ decays of the isovector giant dipole resonance (IVGDR) of the deformed nucleus Sm 154 were measured using 2 1 + -Smekal-Raman and elastic scattering of linearly polarized, quasimonochromatic photon beams. The two scattering processes were disentangled through their distinct angular distributions. Their branching ratio and cross sections were determined at six excitation energies covering the Sm 154 IVGDR. Both agree with the predictions of the geometrical model for the IVGDR and confirm γ decay as an observable sensitive to the structure of the resonance. Consequently, the data place strong constraints on the nuclear shape, including the degree of triaxiality. The derived Sm 154 shape parameters β = 0.2925 ( 25 ) and γ = 5.0 ( 15 ) ° agree well with other measurements and recent Monte Carlo shell-model calculations. Published by the American Physical Society 2025 },
doi = {10.1103/PhysRevLett.134.022503},
url = {https://www.osti.gov/biblio/2500941},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {2},
volume = {134},
place = {United States},
publisher = {American Physical Society},
year = {2025},
month = {01}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3https://doi.org/10.1016/S0168-9002(03)01368-8
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 835https://doi.org/10.1016/j.nima.2016.06.125