학술논문
Isomers and high-spin structures in the N=81 isotones Xe135 and Ba137
Document Type
article
Author
Vogt, A; Birkenbach, B; Reiter, P; Blazhev, A; Siciliano, M; Hadyńska-Klęk, K; Valiente-Dobón, JJ; Wheldon, C; Teruya, E; Yoshinaga, N; Arnswald, K; Bazzacco, D; Bowry, M; Bracco, A; Bruyneel, B; Chakrawarthy, RS; Chapman, R; Cline, D; Corradi, L; Crespi, FCL; Cromaz, M; de Angelis, G; Eberth, J; Fallon, P; Farnea, E; Fioretto, E; Freeman, SJ; Fu, B; Gadea, A; Geibel, K; Gelletly, W; Gengelbach, A; Giaz, A; Görgen, A; Gottardo, A; Hayes, AB; Hess, H; Hirsch, R; Hua, H; John, PR; Jolie, J; Jungclaus, A; Kaya, L; Korten, W; Lee, IY; Leoni, S; Lewandowski, L; Liang, X; Lunardi, S; Macchiavelli, AO; Menegazzo, R; Mengoni, D; Michelagnoli, C; Mijatović, T; Montagnoli, G; Montanari, D; Müller-Gatermann, C; Napoli, D; Pearson, CJ; Pellegri, L; Podolyák, Zs; Pollarolo, G; Pullia, A; Queiser, M; Radeck, F; Recchia, F; Regan, PH; Rosiak, D; Saed-Samii, N; Şahin, E; Scarlassara, F; Schneiders, D; Seidlitz, M; Siebeck, B; Sletten, G; Smith, JF; Söderström, P-A; Stefanini, AM; Steinbach, T; Stezowski, O; Szilner, S; Szpak, B; Teng, R; Ur, C; Vandone, V; Warner, DD; Wiens, A; Wu, CY; Zell, KO
Source
Physical Review C. 95(2)
Subject
Language
Abstract
The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 is identified as an isomer, closing a gap in the systematics along the N=81 isotones. Its half-life is measured to be 9.0(9) ns, corresponding to a reduced transition probability of B(E2,19/2-→15/2-)=0.52(6) W.u. The experimentally deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Latest shell-model calculations reproduce the experimental findings generally well and provide guidance to the interpretation of the new levels.