Isomer Shift of the 123-keV Gamma Rays of ${}^{154}{Gd}$

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14 April 1969

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

Vol. 22 (15) , 790-792
https://doi.org/10.1103/physrevlett.22.790

Abstract

Isomer shifts of the

2^{+}

→

0^{+}

rotational transition in

{}^{154}{Gd}

were determined in Mössbauer measurements. From comparison with isomer shifts in

{}^{156}{Gd}

and

{}^{158}{Gd}

, the ratios

\frac{Δ {〈 r^{2} 〉}_{154}}{Δ {〈 r^{2} 〉}_{156}} = + 7.3 \pm 1.9

and

\frac{Δ {〈 r^{2} 〉}_{154}}{Δ {〈 r^{2} 〉}_{158}} = + 30 \pm 10

are deduced. These ratios imply a considerable increase in rigidity for deformed nuclei above neutron number

N = 90

. The existing theoretical values are discussed.

Keywords

This publication has 13 references indexed in Scilit:

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