Naslov
Identification of high-spin proton configurations in Ba-136 and Ba-137

Autori
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, Tea ; Montagnoli, G. ; Montanari, D. ; Napoli, D. ; Podolyák, Zs. ; 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, Suzana ; Szpak, B. ; Ur, C. ; Valiente- Dobón, J. J. ; Weinert, M. ; Wolf, K. ; Zell, K. O.

Izvornik
Physical review. C (2469-9985) 99 (2019), 1; 014301, 19

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
nuclear spetroscopy ; shell model

Sažetak
The high-spin structures of Ba-136 and Ba-137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Ba-136 is populated in a Xe-136 + U-238 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 Be-9 + Te-130 fusion-evaporation reactions using the High- efficiency Observatory for gamma-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 B-11 + Te-130 fusion-evaporation reaction utilizing the HORUS gamma-ray array. The level scheme above the J(pi) = 10(+) isomer in Ba-136 is revised and extended up to an excitation energy of approximately 5.5 MeV. From the results of angular-correlation measurements, the E-x = 3707- and E-x = 4920-keV states are identified as the bandheads of positive- and negative-parity cascades. While the high-spin regimes of both Te-132 and Xe-134 are characterized by high-energy 12(+) -> 10(+) transitions, the Ba-136 E2 ground-state band is interrupted by negative-parity states only a few hundred keV above the J(pi) = 10(+) isomer. Furthermore, spins are established for several hitherto unassigned high-spin states in Ba-137. The new results close a gap along the high-spin 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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