Persistent decoupling of valence neutrons toward the dripline: Study of C-20 by gamma-spectroscopy

Elekes, Z.; Dombrádi, Zs.; Aiba, T.; Aoi, N.; Baba, H.; Bemmerer, D.; Brown, B. A.; Furumoto, T.; Fülöp, Zs.; Iwasa, N.; Kiss, Á.; Kobayashi, T.; Kondo, Y.; Motobayashi, T.; Nakabayashi, T.; Nannichi, T.; Sakuragi, Y.; Sakurai, H.; Sohler, D.; Takashina, M.; Takeuchi, S.; Tanaka, K.; Togano, Y.; Yamada, K.; Yamaguchi, M.; Yoneda, K.

doi:10.1103/PhysRevC.79.011302

Persistent decoupling of valence neutrons toward the dripline: Study of C-20 by gamma-spectroscopy

Elekes, Z.; Dombrádi, Z.; Aiba, T.; Aoi, N.; Baba, H.; Bemmerer, D.; Brown, B. A.; Furumoto, T.; Fülöp, Z.; Iwasa, N.; Kiss, Á.; Kobayashi, T.; Kondo, Y.; Motobayashi, T.; Nakabayashi, T.; Nannichi, T.; Sakuragi, Y.; Sakurai, H.; Sohler, D.; Takashina, M.; Takeuchi, S.; Tanaka, K.; Togano, Y.; Yamada, K.; Yamaguchi, M.; Yoneda, K.

he very neutron-rich nucleus 20C has been investigated by inelastic scattering on 208Pb and liquid hydrogen targets. Through distorted wave analysis, the reduced electric quadrupole transition probability B(E2;02)<18.4 (stat) e2 fm4 and the neutron transition probability M=292±52 (stat) fm4 have been derived. A simple shell model calculation has shown a need for a factor of about 0.4 decrease of the normal polarization charges to elucidate the results. This is interpreted as a decoupling of the valence neutrons from the nuclear core in carbon isotopes heavier than 14C.

Physical Review C 79(2009), 011302(R)
DOI: 10.1103/PhysRevC.79.011302
Cited 22 times in Scopus

Permalink: https://www.hzdr.de/publications/Publ-12430