A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po

D. Kocheva; G. Rainovski; J. Jolie; N. Pietralla; A. Blazhev; A. Astier; Th. Braunroth; M. L. Cortés; A. Dewald; M. Djongolov; C. Fransen; K. Gladnishki; A. Hennig; V. Karayonchev; J. M. Keatings; J. Litzinger; C. Müller-Gatermann; P. Petkov; M. Scheck; P. Spagnoletti; Ph. Scholz; C. Stahl; R. Stegmann; M. Stoyanova; P. Thöle; N. Warr; V. Werner; W. Witt; D. Wölk; K. O. Zell; P. Van Isacker; V. Yu. Ponomarev

doi:10.1140/epja/i2017-12367-5

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arXiv · 1706.04495

A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po

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Abstract

The lifetimes of the $2^+_1$, the $2^+_2$ and the $3^-_1$ states of $^{210}$Po have been measured in the $^{208}$Pb($^{12}$C,$^{10}$Be)$^{210}$Po transfer reaction by the Doppler-shift attenuation method. The results for the lifetime of the $2^+_1$ state is about three times shorter than the adopted value. However, the new value still does not allow for consistent description of the properties of the yrast $2^+_1$, $4^+_1$, $6^+_1$, and $8^+_1$ states of $^{210}$Po in the framework of nuclear shell models. The Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

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D. Kocheva, G. Rainovski, J. Jolie, N. Pietralla, A. Blazhev, A. Astier, Th. Braunroth, M. L. Cortés, A. Dewald, M. Djongolov, C. Fransen, K. Gladnishki, A. Hennig, V. Karayonchev, J. M. Keatings, J. Litzinger, C. Müller-Gatermann, P. Petkov, M. Scheck, P. Spagnoletti, Ph. Scholz, C. Stahl, R. Stegmann, M. Stoyanova, P. Thöle, N. Warr, V. Werner, W. Witt, D. Wölk, K. O. Zell, P. Van Isacker, V. Yu. Ponomarev. 2017-06-14. A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po. https://doi.org/10.1140/epja/i2017-12367-5

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