تقرير
Magnetic dipole excitations of $^{50}$Cr
| العنوان: | Magnetic dipole excitations of $^{50}$Cr |
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| المؤلفون: | Pai, H., Beck, T., Beller, J., Beyer, R., Bhike, M., Derya, V., Gayer, U., Isaak, J., Kvasil, J., Loher, B., Nesterenko, V. O., Pietralla, N., Martinez-Pinedo, G., Mertes, L., Ponomarev, V. Yu., Reinhard, P. -G., Repko, A., Ries, P. C., Romig, C., Savran, D., Schwengner, R., Tornow, W., Werner, V., Wilhelmy, J., Zilges, A., Zweidinger, M. |
| سنة النشر: | 2016 |
| المجموعة: | Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Experiment, Nuclear Theory |
| الوصف: | The low-lying $M1$-strength of the open-shell nucleus $^{50}$Cr has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV, using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity $\gamma$-ray Source (HI$\gamma$S) facility between 6 and 9.7 MeV of the initial photon energy. Fifteen $1^{+}$ states have been observed between 3.6 and 9.7 MeV. Following our analysis, the lowest $1^{+}$ state at 3.6 MeV can be considered as an isovector orbital mode with some spin admixture. The obtained results generally match the estimations and trends typical for the scissors-like mode. Detailed calculations within the Skyrme Quasiparticle Random-Phase-Approximation method and the Large-Scale Shell Model justify our conclusions. The calculated distributions of the orbital current for the lowest $1^{+}$-state suggest the schematic view of Lipparini and Stringari (isovector rotation-like oscillations inside the rigid surface) rather than the scissors-like picture of Lo Iudice and Palumbo. The spin M1 resonance is shown to be mainly generated by spin-flip transitions between the orbitals of the $fp$-shell. Comment: Accepted in PRC as a regular article |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.93.014318 |
| URL الوصول: | http://arxiv.org/abs/1601.01905 |
| رقم الأكسشن: | edsarx.1601.01905 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.93.014318 |
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