β-Decay half-lives of very neutron-rich Kr to Tc isotopes on the boundary of the r-process path: An indication of fast r-matter flow

S. Nishimura, Z. Li, H. Watanabe, K. Yoshinaga, T. Sumikama, T. Tachibana, K. Yamaguchi, M. Kurata-Nishimura, G. Lorusso, Y. Miyashita, A. Odahara, H. Baba, J. S. Berryman, N. Blasi, A. Bracco, F. Camera, J. Chiba, P. Doornenbal, S. Go, T. HashimotoS. Hayakawa, C. Hinke, E. Ideguchi, T. Isobe, Y. Ito, D. G. Jenkins, Y. Kawada, N. Kobayashi, Y. Kondo, R. Krücken, S. Kubono, T. Nakano, H. J. Ong, S. Ota, Zs Podolyák, H. Sakurai, H. Scheit, K. Steiger, D. Steppenbeck, K. Sugimoto, S. Takano, A. Takashima, K. Tajiri, T. Teranishi, Y. Wakabayashi, P. M. Walker, O. Wieland, H. Yamaguchi

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Abstract

The β-decay half-lives of 38 neutron-rich isotopes from Kr36 to Tc43 have been measured; the half-lives of Kr100, Sr103-105, Y106-108, Zr108-110, Nb111,112, Mo112-115, and Tc116,117 are reported here. The results when compared with previous standard models indicate an overestimation in the predicted half-lives by a factor of 2 or more in the A≈110 region. A revised model based on the second generation gross theory of β decay better predicts the measured half-lives and suggests a more rapid flow of the rapid neutron-capture process (r-matter flow) through this region than previously predicted.

Original languageEnglish
Article number052502
JournalPhysical review letters
Volume106
Issue number5
DOIs
Publication statusPublished - 2011 Feb 3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Nishimura, S., Li, Z., Watanabe, H., Yoshinaga, K., Sumikama, T., Tachibana, T., Yamaguchi, K., Kurata-Nishimura, M., Lorusso, G., Miyashita, Y., Odahara, A., Baba, H., Berryman, J. S., Blasi, N., Bracco, A., Camera, F., Chiba, J., Doornenbal, P., Go, S., ... Yamaguchi, H. (2011). β-Decay half-lives of very neutron-rich Kr to Tc isotopes on the boundary of the r-process path: An indication of fast r-matter flow. Physical review letters, 106(5), [052502]. https://doi.org/10.1103/PhysRevLett.106.052502