https://doi.org/10.1140/epja/i2011-11006-7
Letter
Blocking of coupling to the 02 + excitation in 154Gd by the [505]11/2- neutron in 155Gd
1
University of Western Cape, Department of Physics, P/B X17, ZA-7535, Bellville, South Africa
2
University of Zululand, Department of Physics, P/B X1001, ZA-3886, Kwa Dlangezwa, South Africa
3
iThemba Laboratory for Accelerator Based Sciences, PO Box 722, ZA-7129, Somerset-West, South Africa
4
Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164, Sofia, Bulgaria
5
University of Stellenbosch, Department of Physics, P/B X1, ZA-7602, Stellenbosch, South Africa
6
ATOMKI, POB 51, 4001, Debrecen, Hungary
Received:
30
July
2010
Revised:
15
November
2010
Accepted:
2
December
2010
Published online:
6
January
2011
The concept that the first excited 0+ states in N = 90 nuclei are not a 
-vibration but a second vacuum formed by the combination of the quadrupole pairing force and the low density of oblate orbitals near the Fermi surface is supported by the blocking of this collective mode in 154Gd from coupling to the [505]11/2- single-particle quasi-neutron orbital in 155Gd . The coupling of this orbital to the 2+
-vibration in 154Gd is observed since this coupling is not Pauli-blocked.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
