| Autor: |
Hennig, A., Spieker, M., Werner, V., Ahn, T., Anagnostatou, V., Cooper, N., Derya, V., Elvers, M., Endres, J., Goddard, P., Heinz, A., Huges, R. O., Ilie, G., Mineva, M. N., Petkov, P., Pickstone, S. G., Pietralla, N., Radeck, D., Ross, T. J., Savran, D., Zilges, A. |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Physical Review C 90 (2014) 051302 (R) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevC.90.051302 |
| Popis: |
Background: Excitations with mixed proton-neutron symmetry have been previously observed in the $N=52$ isotones. Besides the well established quadrupole mixed-symmetry states (MSS), octupole and hexadecapole MSS have been recently proposed for the nuclei $^{92}$Zr and $^{94}$Mo. Purpose: The heaviest stable $N=52$ isotone $^{96}$Ru was investigated to study the evolution of octupole and hexadecapole MSS with increasing proton number. Methods: Two inelastic proton-scattering experiments on $^{96}$Ru were performed to extract branching ratios, multipole mixing ratios, and level lifetimes. From the combined data, absolute transition strengths were calculated. Results: Strong $M1$ transitions between the lowest-lying $3^-$ and $4^+$ states were observed, providing evidence for a one-phonon mixed-symmetry character of the $3^{(-)}_2$ and $4^+_2$ states. Conclusions: $sdg$-IBM-2 calculations were performed for $^{96}$Ru. The results are in excellent agreement with the experimental data, pointing out a one-phonon hexadecapole mixed-symmetry character of the $4^+_2$ state. The $\big< 3^-_1||M1||3^{(-)}_2\big>$ matrix element is found to scale with the $<2^+_{\mathrm{s}}||M1||2^+_{\mathrm{ms}}>$ matrix element. |
| Databáze: |
arXiv |
| Externí odkaz: |
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