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βγ(CP) correlation measurements and anti-analogue structure in the decay of Ca
Authors:L. G. Mann

S. D. Bloom

Affiliation:

Lawrence Radiation Laboratory, University of California Livermore, California 94550 , USA

a Lawrence Radiation Laboratory, University of California Livermore, California 94550, USA

b University of California, Department of Applied Science Davis-Livermore, California, USA

Abstract:β-γ(CP) correlation measurements have been carried out on the sequence in the decay of the ground state of 49Ca to the (presumed) anti-analogue state at 3.105 MeV excitation in 49Sc. An asymmetry parameter of A = −0.132 ± 0.017 was obtained, making any spin-parity assignment other than very unlikely for the 3.105 MeV state. The deduced Fermi matrix element for the decay is |Mv| = |1.4 ± 9.7| × 10−3, which leads to an isospin impurity ( ) corresponding to the mixing of the analogue state (at 11.6 MeV) and the 3.105 MeV state of ||2 1.6 × 10−5. This leads in turn to an effective Coulomb matrix element of |Hc| = |3.9 ± 27.4| keV, a low value compared to the value of 100 keV obtained from a theoretical estimate based on simple shell-model wave functions for the single-particle states involved.
Keywords:
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