학술논문
Pairing-quadrupole interplay in the neutron-deficient tin nuclei: first lifetime measurements of low-lying states in $^{106,108}$Sn
Document Type
Working Paper
Author
Siciliano, M.; Valiente-Dobón, J. J.; Goasduff, A.; Nowacki, F.; Zuker, A. P.; Bazzacco, D.; Lopez-Martens, A.; Clément, E.; Benzoni, G.; Braunroth, T.; Cieplicka-Oryńczak, N.; Crespi, F. C. L.; de France, G.; Doncel, M.; Ertürk, S.; Fransen, C.; Gadea, A.; Georgiev, G.; Goldkuhle, A.; Jakobsson, U.; Jaworski, G.; John, P. R.; Kuti, I.; Lemasson, A.; Li, H.; Marchi, T.; Mengoni, D.; Michelagnoli, C.; Mijatović, T.; Müller-Gatermann, C.; Napoli, D. R.; Nyberg, J.; Palacz, M.; Pérez-Vidal, R. M.; Sayği, B.; Sohler, D.; Szilner, S.; Testov, D.; Barrientos, D.; Birkenbach, B.; Boston, H. C.; Boston, A. J.; Cederwall, B.; Cullen, D. M.; Collado, J.; Désesquelles, P.; Dudouet, J.; Domingo-Pardo, C.; Eberth, J.; Egea-Canet, F. J.; González, V.; Judson, D. S.; Harkness-Brennan, L. J.; Hess, H.; Jungclaus, A.; Korten, W.; Labiche, M.; Lefevre, A.; Leoni, S.; Maj, A.; Menegazzo, R.; Million, B.; Pullia, A.; Recchia, F.; Reiter, P.; Salsac, M. D.; Sanchis, E.; Stezowski, O.; Theisen, Ch.; Zielińska, M.
Source
Subject
Language
Abstract
The lifetimes of the low-lying excited states $2^+$ and $4^+$ have been directly measured in the neutron-deficient $^{106,108}$Sn isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted $\gamma$ rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the $B(E2; 2_1^+ \to 0_{g.s.}^+)$ values and it describes well the experimental pattern for $^{104-114}$Sn; the $B(E2; 4_1^+ \to 2_1^+)$ values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in $^{108}$Sn. This result provides insight in the hitherto unexplained $B(E2; 4_1^+ \to 2_1^+)/B(E2; 2_1^+ \to 0_{g.s.}^+) < 1$ anomaly.
Comment: V1: 6 pages, 3 figures, 1 table, theoretical interpretation described in detail in the arXiv paper of A.P.Zuker (cross-reference) V2: added reference to A.P. Zuker paper (arXiv:1905.11479)
Comment: V1: 6 pages, 3 figures, 1 table, theoretical interpretation described in detail in the arXiv paper of A.P.Zuker (cross-reference) V2: added reference to A.P. Zuker paper (arXiv:1905.11479)