Decay properties of the neutron-rich isotopes, ${}^{11}{Li}$ and ${}^{27 - 31}{Na}$

Publisher Website

1 September 1974

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 10 (3) , 1181-1188
https://doi.org/10.1103/physrevc.10.1181

Abstract

Using an on-line mass spectrometer the decay properties of the

T_{z} \geq \frac{5}{2}

nuclei

{}^{11}{Li}

,

{}^{27 - 31}{Na}

,

{}^{29, 30}{Mg}

were studied. The new isotope

{}^{30}{Mg}

(

T_{\frac{1}{2}} = 1200 \pm 500

msec) identified by

β

counting. For the other isotopes the half-lives were remeasured by three independent methods with improved precision. By recording

β

-coincident

γ

spectra, the decays of

{}^{27 - 29}{Na}

were studied, leading to a

1^{+}

assignment for the

{}^{28}{Na}

ground state. By simultaneous

β

and neutron multiscaling the delayed neutron emission probabilities

P_{n}

were determined for

{}^{11}{Li}

and

{}^{27 - 31}{Na}

. The following half-lives (msec) and

P_{n}

values (%) were found (errors see text):

{}^{11}{Li}

(8.5/60.8),

{}^{27}{Na}

(304/0.08),

{}^{28}{Na}

(30.5/0.58),

{}^{29}{Na}

(42.9/15.1),

{}^{30}{Na}

(53.0/33.1),

{}^{31}{Na}

(16.9/30).

Keywords

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