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Identification of high-spin proton configurations in Ba136 and Ba137

Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Gargano, A., Coraggio, L., Itaco, N., Blazhev, A., Arnswald, K., Bazzacco, D. , Birkenbach, B., 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., Hadyńska-Klęk, 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., Mijatović, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyak, Zsolt, Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Siciliano, M., 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. (2019) Identification of high-spin proton configurations in Ba136 and Ba137 Physical Review C, 99 (1), 014301.

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Abstract

The high-spin structures of 136Ba and 137Ba are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. 136Ba is populated in a 136Xe+238U MNT 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 two 9Be + 130Te fusion-evaporation reactions using the High-efficiency Observatory for -Ray Unique Spectroscopy (HORUS) at the FN tandem accelerator of the University of Cologne, Germany. Furthermore, both isotopes are populated in an elusive reaction channel in the 11B+130Te fusion-evaporation reaction utilizing the HORUS -ray array. The level scheme above the J� = 10+ isomer in 136Ba is revised and extended up to an excitation energy of approx. 5.5 MeV. From the results of angular-correlation measurements, the Ex = 3707- and Ex = 4920-keV states are identified as the bandheads of positive- and negative-parity cascades. While the high-spin regimes of both 132Te and 134Xe are characterized by high-energy 12+ ! 10+ transitions, the 136Ba E2 ground-state band is interrupted by negativeparity states only a few hundred keV above the J� = 10+ isomer. Furthermore, spins are established for several hitherto unassigned high-spin states in 137Ba. The new results close a gap along the highspin structure of N < 82 Ba isotopes. Experimental results are compared to large-scale shell-model calculations employing the GCN50:82, Realistic SM, PQM130 and SN100PN interactions. The calculations suggest that the bandheads of the positive-parity bands in both isotopes are predominantly of proton character.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Kaya, L.
Vogt, A.
Reiter, P.
Müller-Gatermann, C.
Gargano, A.
Coraggio, L.
Itaco, N.
Blazhev, A.
Arnswald, K.
Bazzacco, D.
Birkenbach, B.
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.
Hadyńska-Klęk, 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.
Mijatović, T.
Montagnoli, G.
Montanari, D.
Napoli, D.
Podolyak, ZsoltZ.Podolyak@surrey.ac.uk
Pollarolo, G.
Recchia, F.
Rosiak, D.
Saed-Samii, N.
Şahin, E.
Siciliano, M.
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 : 2 January 2019
Funders : FP7, STFC
DOI : 10.1103/PhysRevC.99.014301
Copyright Disclaimer : ©2019 American Physical Society
Depositing User : Christine Daoutis
Date Deposited : 10 Jan 2019 10:00
Last Modified : 10 Jan 2019 10:00
URI: http://epubs.surrey.ac.uk/id/eprint/850108

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