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Millisecond 23/2+ isomers in the N = 79 isotones 133Xe and 135Ba

Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Siciliano, M., Coraggio, L., Itaco, N., Gargano, A., 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., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hetzenegger, R., Hirsch, R., John, P. R., Jolie, J., Jungclaus, A., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Sahin, E., Scarlassara, F., Seidlitz, M., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J. J., Weinert, M., Wolf, K and Zell, K. O. (2018) Millisecond 23/2+ isomers in the N = 79 isotones 133Xe and 135Ba Physical Review C.

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Detailed information on isomeric states in A ≈ 135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly-magic nucleus 132Sn. The N = 79 isotones 133Xe and 135Ba are studied after multinucleon transfer (MNT) in the 136Xe + 208Pb reaction employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy and in a pulsed-beam experiment at the FN tandem accelerator of the University of Cologne, Germany utilizing a 9Be+130Te fusion-evaporation reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed γ-ray spectroscopy. Hitherto tentative excitation energy, spin, and parity assignments of the 2107-keV Jπ = 23/2+ isomer in 133Xe are confirmed and a half-life of T1/2 = 8.64(13) ms is measured. The 2388-keV state in 135Ba is identified as a Jπ = 23/2+ isomer with a half-life of 1.06(4) ms. The new results show a smooth onset of isomeric Jπ = 23/2+ states along the N = 79 isotones and close a gap in the high-spin systematics towards the recently investigated Jπ = 23/2+ isomer in 139Nd. The resulting systematics of M2 reduced transition probabilities is discussed within the framework of the nuclear shell model. Latest large-scale shell-model calculations employing the SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings generally well and give insight into the structure of the isomers.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Kaya, L.
Vogt, A.
Reiter, P.
Müller-Gatermann, C.
Siciliano, M.
Coraggio, L.
Itaco, N.
Gargano, A.
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.
Farnea, E.
Fioretto, E.
Fransen, C.
Gadea, A.
Giaz, A.
Görgen, A.
Gottardo, A.
Hadynska-Klek, K.
Hess, H.
Hetzenegger, R.
Hirsch, R.
John, P. R.
Jolie, J.
Jungclaus, A.
Korten, W.
Leoni, S.
Lewandowski, L.
Lunardi, S.
Menegazzo, R.
Mengoni, D.
Michelagnoli, C.
Mijatovic, T.
Montagnoli, G.
Montanari, D.
Napoli, D.
Podolyák, Zs.
Pollarolo, G.
Recchia, F.
Rosiak, D.
Saed-Samii, N.
Sahin, E.
Scarlassara, F.
Seidlitz, M.
Söderström, P.-A.
Stefanini, A. M.
Stezowski, O.
Szilner, S.
Szpak, B.
Ur, C.
Valiente-Dobón, J. J.
Weinert, M.
Wolf, K
Zell, K. O.
Date : 2018
Funders : European Union Seventh Framework Programme, Science and Technology Facilities Council (STFC)
Copyright Disclaimer : © 2018 American Physical Society
Related URLs :
Depositing User : Clive Harris
Date Deposited : 06 Nov 2018 08:30
Last Modified : 11 Dec 2018 11:24

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