Detailed information on isomeric states in A≈135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly magic nucleus Sn132. The N=79 isotones Xe133 and Ba135 are studied after multinucleon transfer in the Xe136+Pb208 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 Be9+Te130 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 Xe133 are confirmed and a half-life of T1/2=8.64(13) ms is measured. The 2388-keV state in Ba135 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 Nd139. 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.

Millisecond 23/2+ isomers in the N=79 isotones Xe 133 and Ba 135 / L. Kaya, A. Vogt, P. Reiter, C. Müller-Gatermann, M. Siciliano, L. Coraggio, N. Itaco, A. Gargano, K. Arnswald, D. Bazzacco, B. Birkenbach, A. Blazhev, A. Bracco, B. Bruyneel, L. Corradi, F.C.L. Crespi, G. De Angelis, M. Droste, J. Eberth, E. Farnea, E. Fioretto, C. Fransen, A. Gadea, A. Giaz, A. Görgen, A. Gottardo, K. Hadyńska-Klȩk, H. Hess, R. Hetzenegger, R. Hirsch, P.R. John, J. Jolie, A. Jungclaus, W. Korten, S. Leoni, L. Lewandowski, S. Lunardi, R. Menegazzo, D. Mengoni, C. Michelagnoli, T. Mijatović, G. Montagnoli, D. Montanari, D. Napoli, Z. Podolyák, G. Pollarolo, F. Recchia, D. Rosiak, N. Saed-Samii, E. Şahin, F. Scarlassara, M. Seidlitz, P.-. Söderström, A.M. Stefanini, O. Stezowski, S. Szilner, B. Szpak, C. Ur, J.J. Valiente-Dobón, M. Weinert, K. Wolf, K.O. Zell. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 98:5(2018), pp. 054312.1-054312.16. [10.1103/PhysRevC.98.054312]

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

A. Bracco;F.C.L. Crespi;S. Leoni;
2018

Abstract

Detailed information on isomeric states in A≈135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly magic nucleus Sn132. The N=79 isotones Xe133 and Ba135 are studied after multinucleon transfer in the Xe136+Pb208 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 Be9+Te130 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 Xe133 are confirmed and a half-life of T1/2=8.64(13) ms is measured. The 2388-keV state in Ba135 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 Nd139. 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.
High-spin states; multipole mixing ratios; shell-model; gamma-transitions; excited-states; beta-decay; excitations; neutrons; moments; nuclei
Settore FIS/01 - Fisica Sperimentale
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/640088
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