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  • From: Zoltan Mate <mate AT>
  • To: Fizinfo AT
  • Subject: [Fizinfo] Atomki-szeminárium
  • Date: Tue, 21 Jun 2011 10:33:00 +0200 (CEST)
  • List-archive: <>
  • List-id: ELFT HÍRADÓ <>

Az MTA Atommagkutató Intézetének előadótermében
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2011. június 24-én, pénteken 11:00-kor

J. F. Sharpey-Schafer
(University of Western Cape, Belleville, South Africa)

Collective Excitations of Deformed Nuclei
and their Coupling to Single Particle States

címmel előadást tart.

Máté Zoltán

Traditionally [1] the collective excitations of deformed even-even nuclei,
that give rise to intrinsic band heads within the pairing gap, have been
regarded as beta(Kpi=0+), gamma (Kpi=2+) and octupole (Kpi=0- to 3-)
vibrations. However the properties of the lowest excited 02+ states in
deformed nuclei do not generally have the properies of a beta vibration [2].
The low-lying 02+ states in transitional rare earth nuclei have been shown
[3,4] to be 2p-2h, or 4qp, neutron states involving the [505]11/2-
Nilsson orbit extruded by the deformation to the Fermi surface from the
filled h11/2 shell. This is demonstrated by the blocking of the the
coupling of [505]11/2- neutrons in odd-A nuclei to their core 02+ states
in N=88 and N=90 nuclei [4].
This experimental observation leaves gamma and octupole vibrations as the
remaining collective states within the pairing gap. It demonstrates that
nuclei, in general, are stiff to Kpi=0+ vibrations along the symmetry
axis, even in transitional regions where the nuclear shape is changing
It also demonstrates the futility of expecting non-microscopic theories to
be able to describe 02+ states if the effects of Pauli blocking cannot be
included in the models.
In this presentation we will review the the experimental data on Kpi=2+
"gamma-bands" in deformed nuclei, built both on alignments in even-even
nuclei and coupling to single particles in odd-A nuclei.

[1] A. Bohr and B. R. Mottelson, "Nuclear Structure, Vol. II", Singapore:
World Scientific, 1998, pp. 363.
[2] P. E. Garrett, J. Phys. G (London) 27, R1 (2001).
[3] J. F. Sharpey-Schafer et al, Eu. Phys. J. A47 (2011) 5.
[4] J. F. Sharpey-Schafer et al, Eu. Phys. J. A47 (2011) 6.

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