High-spin states in 38K |
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Authors: | CJ Van Der Poel GAP Engelbertink HFR Arciszewski PCN Crouzen JW De Vries EAJM Offermann EJ Evers |
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Institution: | Fysisch Laboratorium, Rijksuniversiteit Utrecht, PO Box 80.000, Utrecht, The Netherlands |
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Abstract: | High-spin states in 38K are investigated with the 24Mg(16O, pnγ)38K reaction at . A recently developed Compton-suppression spectrometer with 120 msr solid angle and a pulsed beam are employed to study their γ-decay. For the E4 transition from the isomeric level at Ex = 3458 keV to the ground state a branching ratio of (0.15 ± 0.02)% is found. On the basis of angular distribution and polarization measurements, in which the delayed feeding component is eliminated, spin-parity assignments are obtained of Jπ(2646 keV) = (2, 4)?, Jπ(3420 keV) = (4, 6)? and Jπ(3458 keV) = (5, 7)+. Prompt-delayed and prompt γγ coincidence experiments are performed to locate high-spin levels above the isomer. Hitherto unobserved levels of high spin are found at Ex = 5254, 7397, 8693, 8747 and 10980 keV and assignments of Jπ = (9+), (10?), (12?), (11?) and (13?) respectively, are suggested by weak-coupling considerations. The experimental results are compared with a large-scale shell-model calculation performed in a configuration space with a 28Si core and ten active particles distributed over the ( shells. The high-spin states appear to have a rather simple shell-model structure. |
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Keywords: | Nuclear reactions |
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