Decay scheme of /sup 11/Be

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.26.1167· OSTI ID:7060929

Millener, D J; Alburger, D E; Warburton, E K; Wilkinson, D H

In a reinvestigation of the ..beta.. decay of /sup 11/Be, formed in the /sup 9/Be(t,p)/sup 11/Be reaction at E/sub t/ = 3.0 MeV, the unique first-forbidden ..beta..-ray transition to the 4445 keV, J/sup ..pi../ = (5/2)/sup -/ state of /sup 11/Be has been found with a branching intensity of 0.054 +- 0.004 % and logf/sub 1/t = 10.93 +- 0.03. The previously unobserved 692-keV ..gamma..-ray branch in the 7978..-->..7286..-->..0 cascade following the ..beta.. feeding of the /sup 11/B 7978-keV state has also been measured as 0.85% and limits were placed on other ..gamma.. branches from the 7978-keV level. Revised values are given for various other ..beta..- and ..gamma..-ray branching ratios. Shell model calculations are made using the full 1h..omega.. basis for the positive-parity states and 0h..omega..+2h..omega.. for the negative-parity states. The calculated electromagnetic decays of positive-parity states in /sup 11/B are compared with experiment. The first-forbidden ..beta..-decay matrix elements involved in the decay of /sup 11/Be to the lowest four states of /sup 11/B are calculated and the resultant decay rates are compared with experiment. The question of meson exchange corrections to the (1/2)/sup +/..-->..(1/2)/sup -/ ..beta.. decay is considered.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 7060929
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 26:3; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR MOMENTUM
BARYONS
BERYLLIUM 11
BERYLLIUM 9 TARGET
BERYLLIUM ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
BORON 11
BORON ISOTOPES
BRANCHING RATIO
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
DECAY
DIRECT REACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY LEVELS
EVEN-ODD NUCLEI
FERMIONS
FT VALUE
GAMMA RADIATION
HADRONS
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRIX ELEMENTS
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
PROTONS
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPIN
STABLE ISOTOPES
STRIPPING
TARGETS
TRANSFER REACTIONS
TRITON REACTIONS
TWO-NUCLEON TRANSFER REACTIONS