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We investigated the β decay of the neutron drip line nucleus 14 Be by means of double and triple coincidence measurements of β rays, delayed neutrons, and γ rays. The decay sequences were established and new values of the half-life and branching ratios were obtained. The decay scheme obtained is characterized by a single dominant branch leading to a 1 + state in 14 B with a branching ratio of ( 91 ± 9 ) % , which subsequently emits a delayed neutron with an energy of 288 ± 8 keV . The excitation energy and width of the 1 + state were determined to be 1.28 ± 0.02 MeV and 49 ± 2 keV , respectively. The excitation energy and width of this level as well as the log ft value were treated in terms of a simple shell model and found to be strongly related to the N = 8 shell gap quenching in 1 3 , 1 4 B and 12 Be .
Physical Review C – American Physical Society (APS)
Published: Jul 1, 2002
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