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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.

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Presentation on theme: "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."— Presentation transcript:

1 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)

2 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

3 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

4 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

5 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

6 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

7 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

8 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

9 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:


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