Nuclear structure of Ac-231

• The low-energy structure of Ac-231 has been investigated by means of gamma ray spectroscopy following the beta(-) decay of Ra-231. Multipolarities of 28 transitions have been established by measuring conversion electrons with a MINI-ORANGE electron spectrometer. The decay scheme of Ra-231 -> Ac-231 has been constructed for the first time. The Advanced Time Delayed beta gamma gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(EI) transition rates derived suggest that the octupole effects., albeit weak, are still present in this exotic nucleus.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

RADIOACTIVITY Fr-231

Ra-231(beta(-)) [from U-238(p

X)

E-p=1 GeV and subsequent mass separation]

measured E gamma

I gamma

E-beta

gamma gamma(-)

beta gamma-coincidence

T-1/2

deduced log ft.Ac-231 deduced levels

J

pi

ICC

multipolarities

B(E1)

B(M1)

T-1/2. Mini-orange spectrometer. Advanced Time Delayed (ATD) beta gamma gamma (t) method

Physics

Fysik

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