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19:30

Brighton_PRESPEC_Jan_2011

Brighton_PRESPEC_Jan_2011

Brighton_PRESPEC_Jan_2011

Deformation and shape changes around 106Zr

111Tc: Urban et al. EPJA24 (2005) 161

116Pd: Hua et al. Phys. Letts. B562 (2003) 201

113TcKnown prolate nuclei

Diagram modified from Urban et alBrighton_PRESPEC_Jan_2011

Brighton_PRESPEC_Jan_2011

MSU: Folden et al; Phys Rev C79 (2009) 064318

113Tc

112Tc

Coincidences are weak but clear:

92 keV gate

258 keV gate

Brighton_PRESPEC_Jan_2011

112Tc < 2

Z=43, N=69 => four combinations of parities for energy surface calculations

g.s –, +

~400 keV –, -

~400 keV +, +

oblate, ~0.2

5/2[422],7/2[523]

Brighton_PRESPEC_Jan_2011

Brighton_PRESPEC_Jan_2011

5/2[422]7/2[523]

92 keV transition

258 keV transition

Measured hindrance for 258 keV E1 is 107 which is not unreasonable =>isomerism caused by shape change

112Tc

Brighton_PRESPEC_Jan_2011

113Tc

Z=43, N=60 => positive and negative parity surfaces

oblate, ~0.2

g.s +ve

triaxial -ve

5/2+

5/2-

5/2[422]

Measured hindrance for 114 keV E1 is 3 x 106 which is not unreasonable =>isomerism caused by shape change

114triaxial

oblate

Brighton_PRESPEC_Jan_2011

Mus

ic

Summary: Isomers observed in 112,113Tc......due to (predicted) shape changeRecently published in Phys Rev C82

Analysis of beta-decay around106Zr is ongoing

Next plans:

Brighton_PRESPEC_Jan_2011

-gamma-gamma coincidences to get lifetimes

=> matrix elements.

Collaborators on 112,113Tc

Brighton_PRESPEC_Jan_2011

A.M.Bruce, S.Lalkovski, A.M.Denis BacelarUniversity of Brighton, UKA.B.Garnsworthy, S.Steer, S.Pietri, Zs.Podolyák, G.F.Farrelly, W.Gelletly, I.J.Cullen, P.M.WalkerUniversity of Surrey, UKM.Górska, P.Bednarczyk, L.Caceres, P.Doornenbal, J.Gerl, J.Grębosz, I.Kojouharov, N.Kurz, W.Prokopowicz, H.Schaffner, S.Tashenov, and H.J.WollersheimGSI, GermanyG.Jaworski, M.PalaczWarsaw University, PolandC.HinkeTUM, GermanyG.IlieUniversity of Cologne, GermanyE.CasarejosUniversity of Vigo, SpainS.Myalski, Polish Academy of Science, PolandF.R.Xu, Y.ShiPeking University, China