Observation of large enhancements of charge exchange cross sections with neutron-rich carbon isotopes

Production cross sections of nitrogen isotopes from high-energy (⁠∼950 MeV per nucleon) carbon isotopes on hydrogen and carbon targets have been measured for the first time for a wide range of isotopes (⁠A=12 to 19). The fragment separator FRS at GSI was used to deliver C-isotope beams. The cross se...

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Detalles Bibliográficos
Autores: Tanihata, I., Terashima, S., Kanungo, R., Ameil, F., Atkinson, J., Ayyad Limonge, Yassid, Cortina Gil, María Dolores, Dillmann, I., Estradé, A., Evdokimov, A., Farinon, F., Geissel, H., Guastalla, G., Janik, R., Knoebel, R., Kurcewicz, J., Litvinov, Yu. A., Marta, M., Mukha, I., Nociforo, C., Ong, H. J., Pietri, S., Prochazka, A., Scheidenberger, C., Sitar, B., Strmen, P., Takechi, M., Tanaka, J., Toki, H., Mostazo Caro, Magdalena, Vargas, J., Winfield, J. S., Weick, H.
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/22789
Acceso en línea:http://hdl.handle.net/10347/22789
Access Level:acceso abierto
Descripción
Sumario:Production cross sections of nitrogen isotopes from high-energy (⁠∼950 MeV per nucleon) carbon isotopes on hydrogen and carbon targets have been measured for the first time for a wide range of isotopes (⁠A=12 to 19). The fragment separator FRS at GSI was used to deliver C-isotope beams. The cross sections of the production of N-isotopes were determined by charge measurements of forward-going fragments. The cross sections show a rapid increase with the number of neutrons in the projectile. Since the production of nitrogen is mostly due to charge-exchange (Cex) reactions below the proton separation energies, the present data suggests a concentration of Gamow–Teller and/or Fermi transition strength at low excitation energies for neutron-rich carbon isotopes. It was also observed that the Cex cross sections were enhanced much more strongly for neutron-rich isotopes in the C-target data.

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