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. et al, 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 :	Name Email ORCID 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 Z.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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