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Isomer spectroscopy in Ba-133 and high-spin structure of Ba-134

AuthorsKaya, L.; Vogt, A.; Reiter, P.; Siciliano, M.; Shimizu, N.; Utsuno, Y.; Wang, H.-K.; Gargano, A.; Coraggio, L.; Itaco, N.; Arnswald, K.; Bazzacco, D.; Birkenbach, B.; Blazhev, A.; Bracco, A.; Bruyneel, B.; Corradi, L.; Crespi, F. C. L.; de Angelis, G.; Droste, M.; Eberth, J.; Esmaylzadeh, A.; Farnea, E.; Fioretto, E.; Fransen, C.; Gadea, Andrés ; Giaz, A.; Görgen, A.; Gottardo, A.; Hadyriska-Klek, K.; Hess, H.; Hirsch, R.; John, P. R.; Jolie, J.; Jungclaus, Andrea ; Karayonchev, V.; Kornwebel, L.; Korten, W.; Leoni, S.; Lewandowski, L.; Lunardi, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Mijatovic, T.; Montagnoli, G.; Montanari, D.; Müller-Gatermann, C.; Napoli, D.; Podolyák, Zs.; Pollarolo, G.; Recchia, F.; Régis, J.-M.; Saed-Samii, N.; Sahin, E.; Scarlassara, F.; Schomacker, K.; Seidlitz, M.; Siebeck, B.; Söderström, P.-A.; Stefanini, A. M.; Stezowski, O.; Szilner, S.; Szpak, B.; Teruya, E.; Ur, C.; Valiente-Dobón, J. J.; Wolf, K.; Yanase, K.; Yoshinaga, N.; Zell, K. O.
Issue Date14-Aug-2019
PublisherAmerican Physical Society
CitationPhysical Review C 100: 024323 (2019)
AbstractThe transitional nuclei Ba-134 and Ba-133 are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The J(pi) = 19/2(+) state at 1942 keV in Ba-133 is identified as an isomer with a half-life of 66.6(20) ns corresponding to a B(E1) value of 7.7(4) x 10(-6) e(2) fm(2) for the J(pi) = 19/2(+) to J(pi) = 19/2(-) transition. The level scheme of Ba-134 above the J(pi) = 10(+) isomer is extended to approximately 6 MeV. A pronounced backbending is observed at h omega = 0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z = 56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional Ba-134.
Description18 pags., 11 figs., 4 tabs.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.100.024323
Identifiersdoi: 10.1103/PhysRevC.100.024323
issn: 2469-9985
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