Gamow-Teller strengths in the A=14 multiplet: A challenge to the shell model
- Negret, A.
- Adachi, T.
- Barrett, B. R.
- Baumer, C.
- van den Berg, A.M.
- 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.
- Kalmykov, Y.
- Korff, A.
- Nakanishi, K.
- Navratil, P.
- von Neumann-Cosel, P.
- Popescu, L.
- Richter, A.
- Ryezayeva, N.
- Sakemi, Y.
- Shevchenko, A.
- Shimbara, Y.
- Shimizu, Y.
- Tameshige, Y.
- Tamii, A.
- Uchida, M.
- Vary, J.
- Wörtche, H. J.
- Yosoi, M.
- Zamick, L.
DOIAbstract
A new experimental approach to the famous problem of the anomalously slow Gamow-Teller (GT) transitions in the beta decay of the A=14 multiplet is presented. The GT strength distributions to excited states in C-14 and O-14 were studied in high-resolution (d,He-2) and (He-3,t) charge-exchange reactions on N-14. No-core shell-model calculations capable of reproducing the suppression of the beta decays predict a selective excitation of J(pi)=2(+) states. The experimental confirmation represents a validation of the assumptions about the underlying structure of the N-14 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 mode...
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