The low-lying states and configurations in138La |
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Authors: | Romedon Lasijo Raymond K. Sheline Roger D. Griffioen James L. DuBard |
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Affiliation: | 1. Florida State University, USA 2. Calvin College and Florida State University, USA 3. University of Louisville, USA
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Abstract: | Tritons from the reaction139La(d, t)138La atE d=16 MeV were analyzed at eleven reaction angles from 22 ° to 90 ° with a broad-range magnetic spectrograph. TheQ-value of the reaction is ?2522±5 keV. The nine lowest-lying states in138La are interpreted in terms of the shell model configurations (πg 7/2)?1 (vd 3/2)?1, (πg 7/2)?1 (vs 1/2)?1 and (πg 7/2)?2 (πd 5/2)?1(vd 3/2)?1. Seven levels in the energy range of 700–1300 keV are populated byl=5 transitions and are interpreted as coming from the (πg 7/2)?1(vh 11/2)?1 configuration. The ground state of138La is shown to haveJ π=5+. Therefore, beta decay by unique second-forbidden transitions to the 2+ one-phonon states of138Ce and138Ba must be inferred in spite of unusually high logft values of 19.2 and 18.5, respectively. |
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