Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons

J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, Z. Y. Xu, P. Doornenbal, G. Lorusso, E. Nácher, G. S. Simpson, P. A. Söderström, T. Sumikama, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H. S. Jung, D. KamedaG. D. Kim, Y. K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y. K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K. Y. Chae, L. Coraggio, A. Covello, J. M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, F. G. Kondev, T. Kröll, G. J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyák, A. Wendt

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Abstract

The decay of an isomeric state in the neutron-rich nucleus 129Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T1/2=3.6(2)ms was determined for the new state which was assigned a spin of (21/2+), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions.

Original languageEnglish
Pages (from-to)223-227
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume738
DOIs
Publication statusPublished - Nov 1 2014

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Taprogge, J., Jungclaus, A., Grawe, H., Nishimura, S., Xu, Z. Y., Doornenbal, P., Lorusso, G., Nácher, E., Simpson, G. S., Söderström, P. A., Sumikama, T., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., ... Wendt, A. (2014). Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 738, 223-227. https://doi.org/10.1016/j.physletb.2014.09.047