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Anomaly of N = 8 shell closure in neutron-rich Be and B isotopes studied via delayed neutron emitting 14 Be β decay

Anomaly of N = 8 shell closure in neutron-rich Be and B isotopes studied via delayed neutron... 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 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Anomaly of N = 8 shell closure in neutron-rich Be and B isotopes studied via delayed neutron emitting 14 Be β decay

Physical Review C , Volume 66 (1) – Jul 1, 2002
11 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2002 The American Physical Society
ISSN
1089-490X
DOI
10.1103/PhysRevC.66.014301
Publisher site
See Article on Publisher Site

Abstract

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 .

Journal

Physical Review CAmerican Physical Society (APS)

Published: Jul 1, 2002

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