FRAGMENTATION OF GAMOW-TELLER STRENGTH OBSERVED IN SN-117,SN-120(HE-3,T)SB-117,SB-120 CHARGE-EXCHANGE REACTIONS
| Autor: | Janecke, J., Pham, K., DA ROBERTS, Stewart, D., Muhsin N. Harakeh, GPA BERG, CC FOSTER, JE LISANTTI, Sawafta, R., EJ STEPHENSON, Den Berg, Adriaan M., SY VANDERWERF, SE MURAVIEV, MH URIN |
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| Přispěvatelé: | KVI - Center for Advanced Radiation Technology, Research unit Astroparticle Physics |
| Jazyk: | angličtina |
| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Physical Review C, 48(6), 2828-2839. AMER PHYSICAL SOC University of Groningen |
| ISSN: | 0556-2813 |
| Popis: | The (He-3,t) charge-exchange reaction has been studied at E(He-3) = 200 MeV and angles near 0-degrees on targets of Sn-117 and Sn-120. Fragmentation of the giant Gamow-Teller resonance into separate components of the particle-hole type has been observed in good agreement with theoretical predictions. These components are connected with what is usually referred to in the literature as direct-, core-polarization-, and back-spin-flip Gamow-Teller strength. The observed cross sections near theta = 0-degrees suggest contributions from the isovector spin-flip interaction as well as the isovector tensor interaction. A theoretically predicted configuration splitting of the main Gamow-Teller component into two components involving the 1h11/2 neutron orbital could not uniquely be identified. The data are compatible, though, with such a splitting since the observed widths of the main Gamow-Teller components in Sb-117 and Sb-120 exceed the predicted splittings. |
| Databáze: | OpenAIRE |
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