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

Kaya, 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, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klęk, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, A., Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatović, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyak, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Şahin, 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. and Zell, K. O. (2019) Isomer spectroscopy in ¹³³Ba and high-spin structure of ¹³⁴Ba Physical Review C, 100 (2), 024323. 024323-1.

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The transitional nuclei ¹³⁴Ba and ¹³³Ba 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 Jπ=19/2⁺ state at 1942 keV in ¹³³Ba is identified as an isomer with a half-life of 66.6(20)ns corresponding to a B(E1) value of 7.7(4)×10⁻⁶e²fm² for the Jπ=19/2⁺ to Jπ=19/2⁻ transition. The level scheme of ¹³⁴Ba above the Jπ=10⁺ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ℏω=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 ¹³⁴Ba.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Kaya, 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, A.
Giaz, A.
Görgen, A.
Gottardo, A.
Hadyńska-Klęk, K.
Hess, H.
Hirsch, R.
John, P. R.
Jolie, J.
Jungclaus, A.
Karayonchev, V.
Kornwebel, L.
Korten, W.
Leoni, S.
Lewandowski, L.
Lunardi, S.
Menegazzo, R.
Mengoni, D.
Michelagnoli, C.
Mijatović, T.
Montagnoli, G.
Montanari, D.
Müller-Gatermann, C.
Napoli, D.
Pollarolo, G.
Recchia, F.
Régis, J.-M.
Saed-Samii, N.
Şahin, 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.
Date : 14 August 2019
Funders : European Union Seventh Framework Programme, Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.100.024323
Copyright Disclaimer : © 2019 American Physical Society
Uncontrolled Keywords : Electromagnetic transitions; Isomer decays; Lifetimes & widths; Nuclear structure & decays
Depositing User : Clive Harris
Date Deposited : 15 Aug 2019 12:55
Last Modified : 15 Aug 2019 12:55

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