Nuclear level densities and gamma-ray strength functions in samarium isotopes

Abstract

The gamma-strength functions and level densities in the quasi-continuum of 147;149Sm isotopes have been extracted from particle-coincidences using the Oslo method. The nuclei of interest were populated via (p,d) reactions on pure 148;150Sm targets and the reaction products were recorded by the Hyperion array. An upbend in the low-energy region of the gSF has been observed. The systematic analysis of the gSF for a range of Sm isotopes highlights the interplay between scissors mode and the upbend. Shell-model calculations show reasonable agreement with the experimental gSFs and confirm the correspondence between the upbend and scissors mode.

References in corpus (15)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• The s Process: Nuclear Physics, Stellar Models, Observations
• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Analysis of possible systematic errors in the Oslo method
• Radiative strength functions in 93-98Mo
• Large enhancement of radiative strength for soft transisitons in the quasicontinuum
• Low-energy enhancement of magnetic dipole radiation
• Particle-Number Reprojection in the Shell Model Monte Carlo Method: Application to Nuclear Level Densities
• Evidence for dipole nature of the low-energy $\gamma$ enhancement in ${}^{56}$Fe
• Large low-energy $M1$ strength for ${}^{56,57}$Fe within the nuclear shell model
• Verification of detailed balance for $\gamma$ absorption and emission in Dy isotopes
• First observation of low-energy γ-ray enhancement in the rare-earth region
• Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of ${}^{56}$Fe
• Consolidating the concept of low-energy magnetic dipole decay radiation
• Establishment of M1 multipolarity of a 6.5 mu_N^2 resonance in 172-Yb at E_gamma=3.3 MeV

Cited by in corpus (5)

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• Decoherence of collective motion in warm nuclei