%0 Journal Article %1 ARNSWALD2021136592 %A Arnswald, K. %A Blazhev, A. %A Nowacki, F. %A Petkov, P. %A Reiter, P. %A Braunroth, T. %A Dewald, A. %A Droste, M. %A Fransen, C. %A Hirsch, R. %A Karayonchev, V. %A Kaya, L. %A Lewandowski, L. %A Müller-Gatermann, C. %A Seidlitz, M. %A Siebeck, B. %A Vogt, A. %A Werner, D. %A Zell, K.O. %D 2021 %J Phys. Lett. B %K blazhev myown reiter %P 136592 %R https://doi.org/10.1016/j.physletb.2021.136592 %T Enhanced quadrupole collectivity in doubly-magic ⁵⁶Ni: Lifetime measurements of the 4₁⁺ and 6₁⁺ states %U https://www.sciencedirect.com/science/article/pii/S0370269321005323 %V 820 %X Lifetime measurements of excited states in doubly-magic 56Ni have been performed exploiting the Doppler-shift attenuation method in order to determine reduced transition probabilities. For the 41+ and 61+ states, the deduced B(E2) values are compared with results from shell-model calculations employing the GXPF1A and the modern PFSDG-U interactions. In addition, valence ab-initio calculations were performed using a novel realistic Hamiltonian derived from chiral perturbation theory including three-body potential contributions and are confronted with the experimental findings. The new results show maximum E2 strength in comparison with known values along the N=28 chain of isotones. The results corroborate the high collectivity for the double shell closure at N=Z=28 which was anticipated from the large B(E2;21+→0g.s.+) value despite the considerable increase of its excitation energy as compared to neighboring semi-magic nuclei. Based on similarities in the shell structures of the self-conjugate doubly-magic nuclei 56Ni and 100Sn, the new values could be an indication for an expected comparable collective behavior of the 61+ state in 100Sn.

@article{ARNSWALD2021136592, abstract = {Lifetime measurements of excited states in doubly-magic 56Ni have been performed exploiting the Doppler-shift attenuation method in order to determine reduced transition probabilities. For the 41+ and 61+ states, the deduced B(E2) values are compared with results from shell-model calculations employing the GXPF1A and the modern PFSDG-U interactions. In addition, valence ab-initio calculations were performed using a novel realistic Hamiltonian derived from chiral perturbation theory including three-body potential contributions and are confronted with the experimental findings. The new results show maximum E2 strength in comparison with known values along the N=28 chain of isotones. The results corroborate the high collectivity for the double shell closure at N=Z=28 which was anticipated from the large B(E2;21+→0g.s.+) value despite the considerable increase of its excitation energy as compared to neighboring semi-magic nuclei. Based on similarities in the shell structures of the self-conjugate doubly-magic nuclei 56Ni and 100Sn, the new values could be an indication for an expected comparable collective behavior of the 61+ state in 100Sn.}, added-at = {2021-09-27T10:38:11.000+0200}, author = {Arnswald, K. and Blazhev, A. and Nowacki, F. and Petkov, P. and Reiter, P. and Braunroth, T. and Dewald, A. and Droste, M. and Fransen, C. and Hirsch, R. and Karayonchev, V. and Kaya, L. and Lewandowski, L. and Müller-Gatermann, C. and Seidlitz, M. and Siebeck, B. and Vogt, A. and Werner, D. and Zell, K.O.}, biburl = {https://www.bibsonomy.org/bibtex/22216e92b734a10be99cd55b93b34d956/ikpcologne}, description = {Enhanced quadrupole collectivity in doubly-magic ⁵⁶Ni: Lifetime measurements of the 4₁⁺ and 6₁⁺ states - ScienceDirect}, doi = {https://doi.org/10.1016/j.physletb.2021.136592}, interhash = {e29feea6c6f7b68dcba96e4959ccc4bd}, intrahash = {2216e92b734a10be99cd55b93b34d956}, issn = {0370-2693}, journal = {Phys. Lett. B}, keywords = {blazhev myown reiter}, pages = 136592, timestamp = {2021-11-02T16:05:27.000+0100}, title = {Enhanced quadrupole collectivity in doubly-magic ⁵⁶Ni: Lifetime measurements of the 4₁⁺ and 6₁⁺ states}, url = {https://www.sciencedirect.com/science/article/pii/S0370269321005323}, volume = 820, year = 2021 }