Elsevier

Nuclear Physics A

Volume 444, Issue 2, 28 October 1985, Pages 285-302
Nuclear Physics A

Lifetime measurements of levels in 34Ar: Isoscalar and isovector matrix elements for E2 analogue transitions

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Abstract

Mean lifetimes have been measured for the low-lying levels in 34Ar(Tz = − 1) excited by the bombardment of 3He-implanted Au targets with a beam of 80 MeV 32S. The lifetimes determined by fitting Doppler-broadened γ-ray lineshapes are as follows (Ex in keV, τ in fs): 2091, 460 ± 60; 3288, 280 ± 50; 3871, > 270 and 4128, 1301+170−130. The resulting transition matrix elements for the 2+1 → 0+1 and 2+2 → 0+1 transitions are compared with those for the analogue transitions in 34S (Tz = + 1) and 34Cl(Tz = 0) to determine the isoscalar and isovector components. The component values are compared with theoretical calculations and with values of the ratio of neutron to proton matrix elements determined by inelastic scattering with strongly interacting probes.

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