21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei | |
Medium-spin states of the neutron-rich 87,89Br isotopes: configurations and shapes | |
Nyakó, B.M.^1 ; Timàr, J.^1 ; Csatlós, M.^1 ; Dombràdi, Zs^1 ; Krasznahorkay, A.^1 ; Kuti, I.^1 ; Sohler, D.^1 ; Tornyi, T.G.^1 ; Czerwiski, M.^2 ; Rzca-Urban, T.^2 ; Urban, W.^2 ; Bczyk, P.^2 ; Atanasova, L.^3 ; Balabanski, D.L.^4 ; Sieja, K.^5 ; Blanc, A.^6 ; Jentschel, M.^6 ; Köster, U.^6 ; Mutti, P.^6 ; Soldner, T.^6 ; De France, G.^7 ; Simpson, G.S.^8 ; Ur, C.A.^9 | |
Institute for Nuclear Research, Hungarian Academy of Sciences, Debrecen | |
H-4026, Hungary^1 | |
Faculty of Physics, University of Warsaw, ul. Pasteura 5, Warsaw | |
PL-02-093, Poland^2 | |
Department of Med. Physics and Biophysics, Medical University - Sofia, Sofia | |
1431, Bulgaria^3 | |
ELI-NP, Horia Hulubei National Institute for RandD in Physics and Nuclear Engineering IFIN-HH, Bucharest-Magurele | |
077125, Romania^4 | |
Universitè de Strasbourg, IPHC, France | |
CNRS, UMR7178, Strasbourg | |
67037, France^5 | |
Institut Laue-Langevin, Grenoble, France^6 | |
GANIL, CEA/DSM CNRS/IN2P3, Bd Henri Becquerel, BP 55027, Caen Cedex 5 | |
F-14076, France^7 | |
LPSC, Universitè Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, Grenoble Cedex | |
F-38026, France^8 | |
INFN, Legnaro, Italy^9 | |
关键词: Cold neutron beams; Ge detectors; Ground-state spins; Langevin; Level schemes; Shell models; Spin levels; Spin state; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012051/pdf DOI : 10.1088/1742-6596/724/1/012051 |
|
来源: IOP | |
【 摘 要 】
Medium-spin excited states of the neutron-rich87Br and89Br nuclei were observed and studied for the first time. They were populated in fission of235U induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of γ radiation following fission has been performed using the EXILL array of Ge detectors. The observed level schemes were compared with results of large valence space shell model calculations. Both medium-spin level schemes consist of band-like structures, whihich can be understood as bands built on the πf5/2, πp3/2and πg9/2configurations. Both nuclei have 5/2-ground state spin-parity contrary to the odd-mass Br isotopes containing fewer neutrons, which have 3/2-ground state spin-parity. On the basis of the properties of the πg9/2decoupled bands the deformations of the87Br and89Br fit to the systematics of nuclei in the region.87Br is close to the vibrational limit, while89Br is more rotational.
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
Medium-spin states of the neutron-rich 87,89Br isotopes: configurations and shapes | 614KB | download |