Transitional $\gamma$ strength in Cd isotopes

Abstract

The level densities and $\gamma$-ray strength functions of ${}^{105,106,111,112}$Cd have been extracted from particle-$\gamma$ coincidence data using the Oslo method. The level densities are in very good agreement with known levels at low excitation energy. The $\gamma$-ray strength functions display no strong enhancement for low $\gamma$ energies. However, more low-energy strength is apparent for ${}^{105,106}$Cd than for ${}^{111,112}$Cd. For $\gamma$ energies above $\approx$ 4 MeV, there is evidence for some extra strength, similar to what has been previously observed for the Sn isotopes. The origin of this extra strength is unclear; it might be due to $E1$ and $M1$ transitions originating from neutron skin oscillations or the spin-flip resonance, respectively.

10 pages, 11 figures

References in corpus (7)

• Analysis of possible systematic errors in the Oslo method
• Impact of a low-energy enhancement in the gamma-ray strength function on the radiative neutron-capture
• The SiRi Particle-Telescope System
• Nuclear level densities and gamma-ray strength functions in 44,45Sc
• Compilation of Giant Electric Dipole Resonances Built on Excited States
• Enhanced radiative strength in the quasi-continuum of 117Sn
• Fermi's golden rule applied to the gamma decay in the quasicontinuum of 46Ti

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