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• W2320535750 abstract "Background: Within the last decade, below the giant dipole resonance the existence of a concentration of additional electric dipole strength has been established. This accumulation of low-lying $E1$ strength is commonly referred to as pygmy dipole resonance (PDR).Purpose: The photoresponse of ${}^{60}$Ni has been investigated experimentally and theoretically to test the evolution of the PDR in a nucleus with only a small neutron excess. Furthermore, the isoscalar and isovector $M1$ resonances were investigated.Method: Spin-1 states were excited by exploiting the $(ensuremath{gamma},{ensuremath{gamma}}^{ensuremath{'}})$ nuclear resonance fluorescence technique with unpolarized continuous bremsstrahlung as well as with fully linearly polarized, quasimonochromatic, Compton-backscattered laser photons in the entrance channel of the reaction.Results: Up to 10 MeV a detailed picture of $J=1$ levels was obtained. For the preponderant number of the individual levels spin and parity were firmly assigned. Furthermore, branching ratios, transition widths, and reduced $B(E1)$ or $B(M1)$ excitation probability were calculated from the measured scattering cross sections. A comparison with theoretical results obtained within the quasiparticle phonon model allows an insight into the microscopic structure of the observed states.Conclusions: Below 10 MeV the directly observed $E1$ strength $[ensuremath{sum}B(E1)ensuremath{uparrow}=(153.8ifmmodepmelsetextpmfi{}9.5)$ ${e}^{2}$(fm)${}^{2}]$ exhausts 0.5% of the Thomas-Reiche-Kuhn sum rule. This value increases to 0.8% of the sum rule $[ensuremath{sum}B(E1)ensuremath{uparrow}=(250.9ifmmodepmelsetextpmfi{}31.1)$ ${e}^{2}$(fm)${}^{2}]$ when indirectly observed branches to lower-lying levels are considered. Two accumulations of $M1$ excited spin-1 states near 8 and 9 MeV excitation energy are identified as isoscalar and isovector $M1$ resonances dominated by proton and neutron ${f}_{7/2}ensuremath{rightarrow}{f}_{5/2}$ spin-flip excitations. The $B(M1)ensuremath{uparrow}$ strength of these structures accumulates to 3.94(27)${ensuremath{mu}}_{N}^{2}$." @default.
• W2320535750 created "2016-06-24" @default.
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• W2320535750 date "2013-10-07" @default.
• W2320535750 modified "2023-10-01" @default.
• W2320535750 title "Photoresponse of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>60</mml:mn></mml:msup></mml:math>Ni below 10-MeV excitation energy: Evolution of dipole resonances in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>f</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math>-shell nuclei near<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:…" @default.
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• W2320535750 doi "https://doi.org/10.1103/physrevc.88.044304" @default.
• W2320535750 hasPublicationYear "2013" @default.
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