Lifetimes of Levels in $A = 10$ Nuclei

The Doppler-shift attenuation method was used to obtain the following mean lifetimes (in psec) for the indicated nuclear levels:

{}^{10}C

(3.36),

τ = 0.155 \pm 0.025

;

{}^{10}B

(3.59),

τ = 0.150 \pm 0.015

;

{}^{10}{Be}

(3.37),

τ = 0.189 \pm 0.020

;

{}^{10}B

(2.15),

τ = {2.7}_{- 0.4}^{+ 0.5}

. A limit of

τ < 30

fsec is obtained for

{}^{10}B

(1.74), which is a factor of 8 greater than, and therefore consistent with, the lifetime computed from the analog

β

decay of

{}^{10}C

. Transition strengths obtained from the

{}^{10}B

(2.15) and

{}^{10}B

(3.59) lifetimes are in good agreement with the effective-interaction calculations of Cohen and Kurath, as modified by Warburton et al. The

{}^{10}C

(3.36) and

{}^{10}{Be}

(3.37) states decay by analog

E 2

transitions:

2^{+}

T = 1 \to 0^{+}

T = 1

, with

T_{z} = \pm 1

, whose strengths are well described by calculations of Kurath's for an effective charge

ε_{n} = ε_{p} = 0.5

. An upper limit was obtained for the corresponding transition 5.17 → 1.74 in

{}^{10}B (T_{z} = 0)

which is consistent (factor of 4 greater) with the analog strengths observed in the

T_{z} = \pm 1

nuclei.

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Lifetimes of Levels inA=10Nuclei