β -decay scheme of Te 140 to i 140: Suppression of Gamow-Teller transitions between the neutron h9/2 and proton h11/2 partner orbitals

B. Moon, C. B. Moon, A. Odahara, R. Lozeva, P. A. Söderström, F. Browne, C. Yuan, A. Yagi, Byungsik Hong, H. S. Jung, P. Lee, C. S. Lee, S. Nishimura, P. Doornenbal, G. Lorusso, T. Sumikama, H. Watanabe, I. Kojouharov, T. Isobe, H. BabaH. Sakurai, R. Daido, Y. Fang, H. Nishibata, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J. M. Daugas, F. Didierjean, E. Ideguchi, T. Ishigaki, S. Morimoto, M. Niikura, I. Nishizuka, T. Komatsubara, Y. K. Kwon, K. Tshoo

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Abstract

We report for the first time the β-decay scheme of Te140 (Z=52) to I140 (Z=53), with a specific focus on the Gamow-Teller strength along N=87 isotones. These results were obtained in an experiment performed at the Radioactive Ion Beam Factory (RIBF), RIKEN, where the parent nuclide, Te140, was produced through the in-flight fission of a U238 beam at 345 MeV per nucleon impinging on a Be9 target. Based on data from the high-efficiency γ-ray spectrometer, EUROBALL-RIKEN Cluster Array (EURICA), we constructed a decay scheme of I140. The half-life of Te140 has been determined to be 350(5) ms. A level at 926 keV has been assigned as a (1+) state based on the logft value of 4.89(6). This (1+) state, commonly observed in odd-odd nuclei, can be interpreted in terms of the πh11/2νh9/2 configuration formed by the Gamow-Teller transition between a neutron in the h9/2 orbital and a proton in the h11/2 orbital. We observe a sharp contrast to this type of β-decay branching to the lower-lying 1+ states between I140 and I136, where we see a large reduction as the number of neutrons increases. This is in contrast to the prediction by large-scale shell model calculations. To investigate this type of the suppression, results of the Nilsson model calculations will be discussed. Along the isotones with N=87, we discuss a characteristic feature of the Gamow-Teller distributions at 1+ states with respect to the isospin difference.

Original languageEnglish
Article number014325
JournalPhysical Review C
Volume96
Issue number1
DOIs
Publication statusPublished - 2017 Jul 31

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Moon, B., Moon, C. B., Odahara, A., Lozeva, R., Söderström, P. A., Browne, F., Yuan, C., Yagi, A., Hong, B., Jung, H. S., Lee, P., Lee, C. S., Nishimura, S., Doornenbal, P., Lorusso, G., Sumikama, T., Watanabe, H., Kojouharov, I., Isobe, T., ... Tshoo, K. (2017). β -decay scheme of Te 140 to i 140: Suppression of Gamow-Teller transitions between the neutron h9/2 and proton h11/2 partner orbitals. Physical Review C, 96(1), [014325]. https://doi.org/10.1103/PhysRevC.96.014325