학술논문
Statistical properties of the well deformed $^{153,155}$Sm nuclei and the scissors resonance
Document Type
Working Paper
Author
Malatji, K. L.; Beckmann, K. S.; Wiedeking, M.; Siem, S.; Goriely, S.; Larsen, A. C.; Ay, K. O.; Garrote, F. L. Bello; Campo, L. Crespo; Görgen, A.; Guttormsen, M.; Ingeberg, V. W.; Jones, P.; Kheswa, B. V.; von Neumann-Cosel, P.; Ozgur, M.; Potel, G.; Pellegri, L.; Renstrøm, T.; Tveten, G. M.; Zeiser, F.
Source
PRC 103 (2021) 014309
Subject
Language
Abstract
The Nuclear Level Densities (NLDs) and the $\gamma$-ray Strength Functions ($\gamma$SFs) of $^{153,155}$Sm have been extracted from (d,p$\gamma$) coincidences using the Oslo method. The experimental NLD of $^{153}$Sm is higher than the NLD of $^{155}$Sm, in accordance with microscopic calculations. The $\gamma$SFs of $^{153,155}$Sm are in fair agreement with QRPA calculations based on the D1M Gogny interaction. An enhancement is observed in the $\gamma$SF for both $^{153,155}$Sm nuclei around 3 MeV in excitation energy and is attributed to the M1 Scissors Resonance (SR). Their integrated strengths were found to be in the range 1.3 - 2.1 and 4.4 - 6.4 $\mu^{2}_{N}$ for $^{153}$Sm and $^{155}$Sm, respectively. The strength of the SR for $^{155}$Sm is comparable to those for deformed even-even Sm isotopes from nuclear resonance fluorescence measurements, while that of $^{153}$Sm is lower than expected.