Gamow-Teller strengths in the A=14 multiplet: A challenge to the shell model

A. Negret, T. Adachi, B. R. Barrett, C. Bäumer, A. M. Van Den Berg, G. P.A. Berg, P. Von Brentano, D. Frekers, D. De Frenne, H. Fujita, Kunihiro Fujita, Y. Fujita, E. W. Grewe, P. Haefner, M. N. Harakeh, K. Hatanaka, K. Heyde, M. Hunyadi, E. Jacobs, Y. KalmykovA. Korff, K. Nakanishi, P. Navrátil, P. Von Neumann-Cosel, L. Popescu, S. Rakers, A. Richter, N. Ryezayeva, Y. Sakemi, A. Shevchenko, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, M. Uchida, J. Vary, H. J. Wörtche, M. Yosoi, L. Zamick

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Abstract

A new experimental approach to the famous problem of the anomalously slow Gamow-Teller (GT) transitions in the β decay of the A=14 multiplet is presented. The GT strength distributions to excited states in C14 and O14 were studied in high-resolution (d,He2) and (He3,t) charge-exchange reactions on N14. No-core shell-model calculations capable of reproducing the suppression of the β decays predict a selective excitation of Jπ=2+ states. The experimental confirmation represents a validation of the assumptions about the underlying structure of the N14 ground state wave function. However, the fragmentation of the GT strength over three 2+ final states remains a fundamental issue not explained by the present no-core shell model using a 6 ω model space, suggesting possibly the need to include cluster structure in these light nuclei in a consistent way.

Original languageEnglish
Article number062502
JournalPhysical Review Letters
Volume97
Issue number6
DOIs
Publication statusPublished - Jan 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Negret, A., Adachi, T., Barrett, B. R., Bäumer, C., Van Den Berg, A. M., Berg, G. P. A., Von Brentano, P., Frekers, D., De Frenne, D., Fujita, H., Fujita, K., Fujita, Y., Grewe, E. W., Haefner, P., Harakeh, M. N., Hatanaka, K., Heyde, K., Hunyadi, M., Jacobs, E., ... Zamick, L. (2006). Gamow-Teller strengths in the A=14 multiplet: A challenge to the shell model. Physical Review Letters, 97(6), [062502]. https://doi.org/10.1103/PhysRevLett.97.062502