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 - PowerPoint PPT Presentation
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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 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)
Transcript
Coulomb excitation of the band-terminating 12+ yrast trap in 52Fe
IFIC, CSIC – University of Valencia, SpainUniversity and INFN-Sezione di Padova, ItalyINFN-Laboratori Nazionali di Legnaro, Padova, ItalyUniversity and INFN-Sezione di Milano, ItalyDepartment of Physics, Texas A&M University, USADepartment of Physics, Lund University, SwedenIEM – CSIC Madrid, SpainUniversity of York, York, United KingdomCEA-Saclay, SPhN, FranceLRI – University of Salamanca, SpainGSI-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
48Cr E.Caurier et al., PRL 75
25492424
4925 CrMn
A. P. Zuker et al., PRL 89
S. M. Lenzi et al., PRC 56
Extended experimental information + Large Scale Shell Model calculationsObservation
of rotational properties
Comparison of LSSM and CHFB descriptions
Accurate description of
the nuclear excitations
The 52Fe level scheme
C.A.Ur et al., Phys. Rev. C58 (1998) 3163F.Brandolini and C.A.Ur, Phys. Rev. C71 (2005) 054316A.Gadea et al., Phys. Lett. B619 (2005) 88
SpinSpin
K=0: (g.s.)K=6: or [312]5/2- [303]7/2-
K=12: K=12: and and [312]5/2- [303]7/2- [312]5/2- [303]7/2-
Exp. GASP@LNL +MS@GSI
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+ 8+
1) . “Best” agreement with the more collective 12+ calculated with FPD6A.Gadea et al., Phys. Lett. B619 (2005) 88
Exp. GSI mass separator
Minimum p3/2 occupancy
52Fe 52Mn
C.A.Ur et al., PRC58 (1998) 3163
M.Axiotis et al., PRC76 (2007) 014303
D.Rudolph et al., PRC78 (2008) 021301(R)
Unexpected low energy negative parity states in 52Fe and 52Mn
Large l proton decay of the deformed states in
56Ni, 58Ni, 58Cu and the 10+ isomer in 54Ni
fp-Shell LSSM Calculations fp-Shell LSSM
calculation performed with the GXPF1
interaction and the code ANTOINE
B(E2 12+2 12+
1) = 21 e2fm4
B(E2 14+1 12+
1) = 27 e2fm4
B(E2 14+2 12+
1) = 6 e2fm4
Preliminary Beyond-Mean Field calculation suggest oblate deformation for the
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/cm2
208Pb or 197Au target Detection of gamma-rays with AGATA
Identification of secondary products with LYCCA
GSI-FRS
Experimental DetailsExperiment to be performed with the GSI-FRS secondary isomeric beam at
the AGATA-PRESPEC setup
9Be target
LYCCA
S4
52Fe12+ 52Fe*
=0.51 =0.48
~3.5 ps to cross the target: fast raytransition(~ 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(E2,12+
114+1)= 31 e2fm4 pessimistic value of band terminating)
•Primary SIS beam 58Ni 109 ions per spill.•MOCADI and LISE++ predict 105 per spill 52Fe ions at FRS focal plane•Isomeric yield estimated ≥ 10% (example 10+ isomer in 54Ni)•-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/cm2
Experimental DetailsSecondary
target
A.Gadea, A.Algora IFIC, CSIC – University of Valencia, SpainC.A.Ur, S.M. Lenzi, S.Lunardi, E.Farnea, D.Bazzacco, R.Menegazzo, D.Mengoni, F.Recchia University and INFN-Sezione di Padova, ItalyM.Górska, P.Boutachkov, J.Gerl, S.Pietri, H.J.Wollersheim, H.Grawe, C.Domingo-Pardo, I.Kojouharov, H.Schaffner, N.Goel, R.Hoischen, T.EngelGSI-Darmstadt, Germany J.J.Valiente-Dobón, G.de Angelis, D.R.Napoli, E.Sahin, C.MichelagnoliINFN-Laboratori Nazionali di Legnaro, Padova, ItalyA.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, ItalyC.A.Bertulani Department of Physics, Texas A&M University, USAD.Di Julio, C.Fahlander, J.Gellanki, P.Golubev, R.Hoischen, D.RudolphDepartment of Physics, Lund University, SwedenA.Jungclaus IEM – CSIC Madrid, SpainM.A.Bentley University of York, York, United KingdomA.Obertelli, W.Korten CEA-Saclay, SPhN, FranceB.Quintana, M.Doncel, I.Sagrado LRI – University of Salamanca, Spain and the PRESPEC, FRS and LYCCA collaborations
