Coulomb excitation of the band-terminating 12 + yrast trap in 52 Fe IFIC, CSIC – University of Valencia, Spain University and INFN-Sezione di Padova, Italy INFN-Laboratori Nazionali di Legnaro, Padova, Italy University and INFN-Sezione di Milano, Italy Department of Physics, Texas A&M University, USA Department of Physics, Lund University, Sweden IEM – CSIC Madrid, Spain University of York, York, United Kingdom CEA-Saclay, SPhN, France LRI – University of Salamanca, Spain GSI-Darmstadt, Germany and the AGATA, PRESPEC, LYCCA and FRS collaborations A.Gadea(IFIC Valencia) C.A.Ur (Univ. and INFN Padova) M.Gorska (GSI Contact Person)

The fp-Shell: Laboratory for Nuclear Models N=Z 48 Cr E.Caurier et al., PRL 75 A. P. Zuker et al., PRL 89 S. M. Lenzi et al., PRC 56 Extended experimental information + Large Scale Shell Model calculations Observation of rotational properties Comparison of LSSM and CHFB descriptions Accurate description of the nuclear excitations

The 52 Fe level scheme C.A.Ur et al., Phys. Rev. C58 (1998) 3163 F.Brandolini and C.A.Ur, Phys. Rev. C71 (2005) A.Gadea et al., Phys. Lett. B619 (2005) 88 Spin K=0: (g.s.) K=6:  or [312]5/2- [303]7/2- K=12:  and [312]5/2- [303]7/2- Exp. + LSSM withKB3G 12 + seniority isomer & yrast trap Rotor with  =0.26

Hint of Collectivity in the 12 + state The S.M. calculations do not reproduce the B(E4), specially the B(E4, 12 +  ). “Best” agreement with the more collective 12 + calculated with FPD6 A.Gadea et al., Phys. Lett. B619 (2005) 88 Exp. GSI mass separator Minimum p3/2 occupancy

52 Fe 52 Mn C.A.Ur et al., PRC58 (1998) 3163 M.Axiotis et al., PRC76 (2007) D.Rudolph et al., PRC78 (2008) (R) Unexpected low energy negative parity states in 52 Fe and 52 Mn Large l proton decay of the deformed states in 56 Ni, 58 Ni, 58 Cu and the 10 + isomer in 54 Ni

fp-Shell LSSM Calculations fp-Shell LSSM calculation performed with the GXPF1 interaction and the code ANTOINE B(E  ) = 21 e 2 fm 4 B(E  ) = 27 e 2 fm 4 B(E  ) = 6 e 2 fm 4 Preliminary Beyond-Mean Field calculation suggest oblate deformation for the 12+ and 14+ states with quadrupole moments Q=-53 fm2 and -218 fm2

58 Ni Primary Beam Fragmentation Light target Production of the 12+ isomeric beam b y fragmentation of 58Ni on a 9Be target  Separation of 52Fe at FRS  Coulomb excitation on a 750mg/cm 2 208Pb or 197Au target  Detection of gamma-rays with AGATA Identification of secondary products with LYCCA GSI-FRS Experimental Details Experiment to be performed with the GSI-FRS secondary isomeric beam at the AGATA-PRESPEC setup 9 Be target LYCCA S4

52 Fe Fe *  =0.51  =0.48 ~3.5 ps to cross the target: fast  ray transition  (~ 0.2ps)  FWHM given by  in target calculated to be max. 3% for AGATA H.J. Wollersheim et al., NIM A537 Relativistic Coulom Excitation for the 12+ isomer calculated with the DWEIKO code (C.A.Bertulani et al.)  5mb for the LSSM B(E2) (B(E2,  )= 31 e 2 fm 4  pessimistic value of band terminating) Primary SIS beam 58 Ni 10 9 ions per spill. MOCADI and LISE++ predict 10 5 per spill 52 Fe ions at FRS focal plane Isomeric yield estimated ≥ 10% (example 10 + isomer in 54 Ni)  -ray energy Emitted by the ion at  =0.51  5.5 MeV AGATAefficiency for 5.5 MeV  -ray (with Lorentz Boost) ~3% Solid angle efficiency for LYCCA-0 in this reaction  79% With 2 s spill  1000 counts in 15 shifts Special requirements segmented SC detector at S2 (under construction) and digital readout at the MUSIC and TPC detectors (under development) 750mg/cm 2 Experimental Details Secondary target

A.Gadea, A.Algora IFIC, CSIC – University of Valencia, Spain C.A.Ur, S.M. Lenzi, S.Lunardi, E.Farnea, D.Bazzacco, R.Menegazzo, D.Mengoni, F.Recchia University and INFN-Sezione di Padova, Italy M.Górska, P.Boutachkov, J.Gerl, S.Pietri, H.J.Wollersheim, H.Grawe, C.Domingo-Pardo, I.Kojouharov, H.Schaffner, N.Goel, R.Hoischen, T.Engel GSI-Darmstadt, Germany J.J.Valiente-Dobón, G.de Angelis, D.R.Napoli, E.Sahin, C.Michelagnoli INFN-Laboratori Nazionali di Legnaro, Padova, Italy A.Bracco, G.Benzoni, S.Brambilla, F.Camera, F.Crespi, S.Leoni, B.Million, D.Montanari, N.Blasi, O.Wieland University and INFN-Sezione di Milano, Italy C.A.Bertulani Department of Physics, Texas A&M University, USA D.Di Julio, C.Fahlander, J.Gellanki, P.Golubev, R.Hoischen, D.Rudolph Department of Physics, Lund University, Sweden A.Jungclaus IEM – CSIC Madrid, Spain M.A.Bentley University of York, York, United Kingdom A.Obertelli, W.Korten CEA-Saclay, SPhN, France B.Quintana, M.Doncel, I.Sagrado LRI – University of Salamanca, Spain and the PRESPEC, FRS and LYCCA collaborations Collaboration: