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Persistence of octupole correlations in [formula omitted]Ra
Ist Teil von
Nuclear physics. A, 2001, Vol.686 (1), p.71-108
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2001
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
The structure of
231
Ra, the heaviest odd Ra nucleus currently accessible for detailed spectroscopic investigation, has been studied in the
β
−
decay of
231
Fr. The main purpose has been to verify whether fast
B(E1) rates and significant octupole correlations recently established in
229
Ra persist in
231
Ra. The excited states in
231
Ra have been determined for the first time. Spins and parities have been deduced from conversion electron measurements, while level half-lives in the ps and ns ranges have been measured with the Advanced Time Delayed
βγγ(t) method. The moderately fast
B(E1) rates found for transitions connecting the lowest-lying
K
π=5/2
±
and
K
π=1/2
±
bands, reveal the persistence of octupole collective effects in
231
Ra, although the
B(E1) rates are lower than in
229
Ra. These findings reinforce the differences in the
B(E1) systematics between isotonic Ra and Th nuclei.