Cross-shell excitations in Si 31
| Autor: | Tai, P. L., Tabor, S. L., Lubna, R. S., Kravvaris, K., Bender, P. C., Tripathi, Vandana, Volya, A., Carpenter, M. P., Janssens, R. V.F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Paschalis, S., Petri, M., Macchiavelli, A. O., Reviol, W., Sarantites, D. G. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Physical Review C, vol 96, iss 1 Tai, PL; Tabor, SL; Lubna, RS; Kravvaris, K; Bender, PC; Tripathi, V; et al.(2017). Cross-shell excitations in Si 31. Physical Review C, 96(1). doi: 10.1103/PhysRevC.96.014323. Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory. Retrieved from: http://www.escholarship.org/uc/item/6x3004t8 |
| ISSN: | 2469-9993 |
| Popis: | © 2017 American Physical Society. The Si31 nucleus was produced through the O18(O18, αn) fusion-evaporation reaction at Elab=24MeV. Evaporated α particles from the reaction were detected and identified in the Microball detector array for channel selection. Multiple γ-ray coincidence events were detected in Gammasphere. The energy and angle information for the α particles was used to determine the Si31 recoil kinematics on an event-by-event basis for a more accurate Doppler correction. A total of 22 new states and 52 new γ transitions were observed, including 14 from states above the neutron separation energy. The positive-parity states predicted by the shell-model calculations in the sd model space agree well with experiment. The negative-parity states were compared with shell-model calculations in the psdpf model space with some variations in the N=20 shell gap. The best agreement was found with a shell gap intermediate between that originally used for A≈20 nuclei and that previously adapted for P32,34. This variation suggests the need for a more universal cross-shell interaction. |
| Databáze: | OpenAIRE |
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