Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements
Date
2011
Authors
Jungclaus, A.
Walker, J.
Leske, J.
Speidel, K.-H.
Stuchbery, Andrew
East, Michael
Boutachkov, P.
Cederkall, J.
Doornenbal, P.
Egido, J.L.
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Volume Title
Publisher
Elsevier
Abstract
Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes112Sn,114Sn and116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.
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Keywords
Keywords: Doppler shift attenuation technique; Lifetimes; Sn isotopes
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Physics Letters B
Type
Journal article
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Open Access
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