Experimental study of Gamow-Teller transitions via the high-energy-resolution O 18 (He 3,t) F 18 reaction: Identification of the low-energy >super>-Gamow-Teller state

Using the high-resolution O18(He3,t)F18 reaction at 0 and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition...

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Detalhes bibliográficos
Autores: Fujita, H., Fujita, Y., Utsuno, Y., Yoshida, K., Adachi, T., Algora, Alejandro, Csatlós, M., Deaven, J.M., Estevez-Aguado, E., Guess, C.J., Gulyás, J., Hatanaka, K., Hirota, K., Hutton, R., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Molina, F., Okamura, H., Ong, H.J., Perdikakis, G., Rubio, Berta, Scholl, C., Shimbara, Y., Süsoy, G., Suzuki, T., Tamii, A., Thies, J.H., Zegers, R.G.T., Zenihiro, J.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/208311
Acesso em linha:http://hdl.handle.net/10261/208311
Access Level:acceso abierto
Descrição
Resumo:Using the high-resolution O18(He3,t)F18 reaction at 0 and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to Ex=12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0. The B(GT) value obtained from the β decay of F18 (g.s.) →O18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F18. The obtained B(GT) values were compared with those from the O18(p,n)F18 reaction and the mirror symmetric β+ decay of Ne18→F18. The candidates for 1+ states with isospin T=1 were identified by comparison with the O18(p,p′) data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F18 ground state, suggesting that this state is the low-energy super GT state.

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