Probing core polarization around 78Ni:

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Presentation transcript:

Probing core polarization around 78Ni: intermediate energy Coulomb excitation of 74Ni. T. Marchi

T. Marchi INPC 2013 Florence June 6, 2013 Outline Introduction: shell evolution along Ni isotopic chain, towards 78Ni. 74Ni: what has been measured so far. 74Ni: intermediate energy Coulomb excitation (NSCL 09031 – De Angelis Feb 2011) Exotic Beam production; Experimental setup; Data analysis and B(E2)↑ extraction; Discussion and outlook. T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 Introduction Motivation: 1-Study the evolution of nuclear Shells far from stability, towards 78Ni. 2-Test model space and interactions far from stability. [B. Pritychenko et al, arXiv:1102.3365v2 ] T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni What has been measures so far – 74Co decay T. Marchi INPC 2013 Florence June 6, 2013

74Ni What has been measures so far - proton scattering Proton inelastic scattering [N. Aoi et al, Phys. Lett. B 602, 302 (2010)] T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni radioactive beam production 74Ni ≈ 0.7 pps dp/p = 3% 74Ni/77Zn ≈ 0.3 74Ni purity ≈ 1.5% 86Kr34+ @ 140 AMeV 9Be 399 mg/cm2 T. Marchi INPC 2013 Florence June 6, 2013

74Ni Experimental setup Object scintillator S800 Analysis line Focal Plane detectors Object scintillator S800 Analysis line S800 Spectrometer Secondary target position 197Au 640 mg/cm2 CAESAR array T. Marchi INPC 2013 Florence June 6, 2013

74Ni CAESAR scintillator array [D. Weisshaar et al., NIM A 624, 615 (2010)] Experimental gamma-rays multiplicity CAESAR Resolution CAESAR Efficiency T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni S800 Focal Plane Detectors P10 500 Torr 80% CF4 20% C4H10 [D. Bazin et al., NIM B 204, 629 (2003)] T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni The S800 spectrometer and the CAESAR array CAESAR array CAESAR array + S800 spectrometer T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni Beam Tagging and Particle Identification Beam Tagging Focal plane PID Runs without target T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 74Ni Data analysis: particles information and gamma rays time gate Beam energy: Energy-time gamma-rays gate: Impact parameter selection: T. Marchi INPC 2013 Florence June 6, 2013

P RELIMINARY 74Ni Event by event analysis and gamma-ray spectra Fit: GEANT4 + exponential bkg P RELIMINARY [A. Winther and K. Alder, Nucl. Phys. A319, 518 (1979)] T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 Results V low k Monte Carlo Shell model LNPS The B(E2; 0+ →2+) value obtained in the intermediate energy Coulomb excitation provides new important information for the understanding of the Ni isotopic chain towards the 78Ni doubly magic nucleus. 1-The collectivity enhancement suggested by the (p,p’) experiment seems quenched when using purely electromagnetic probes; 2-The obtained values can be used to benchmark the Model Space and interaction used for several Shell Model Calculations far from stability. T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 Discussion and outlook 1.In principle the inelastic scattering data compared to Coulex results allow to disentangle the proton/neutron excitation matrix elements. For the 74Ni isotope, their difference could be an indication of the relative proton/neutron cores polarization leading to different deformation. A higher degree of accuracy is needed to constrain the B(E2) error bar and provide quantitative Mn/Mp ratio information. For this reason two different experiments have been very recently performed: 72Ni (p,p’) inelastic scattering at NSCL (GRETINA) 74Ni Coulex at RIKEN with higher beam intensity (~ 150 counts in the 2+ peak). 2.Measured values can be used to benchmark the Model Space and interaction definition far from stability. The extension of the model space to the neutron d5/2 orbital reveals necessary for a better data description using the Vlow k effective interaction. 3.The good agreement of the experimental data to the results of the Shell Model Calculation with the LNPS interaction may suggest the underlying presence of the “physics Island of inversion” as treated by Lenzi et al in [S. M. Lenzi et al, Phys Rev C 82, 054301 (2010)] . 4-Surprisingly all the models predict an increase of the B(E2) values for the 78Ni nucleus T. Marchi INPC 2013 Florence June 6, 2013

T. Marchi INPC 2013 Florence June 6, 2013 Collaboration T. Marchi,1, 2 G. De Angelis,1 T. Baugher,3 D. Bazin,3 J. Berryman,3 R. Clark,4 E. Crawford,4 M. Doncel,5 E. Farnea,6 A. Gade,3 A. Gadea,7 T. Glasmacher,3 A. Gottardo,1, 2 F. Gramegna,1 S. McDaniel,3 C. Michelagnoli,2, 6 D.R. Napoli,1 B. Quintana,7 A. Ratkiewicz,3 F. Recchia, 2, 6 E. Sahin,1 A. Shore,3 R. Stroberg,3 J.J. Valiente-Dobón,1 D. Weisshaar,3 K. Wimmer,3 and R. Winkler3 1INFN Legnaro National Laboratories, Legnaro (Pd), Italy 2Department of Physics, Padua University, Padua, Italy 3NSCL, Michigan State University, East Lansing, Michigan 48824-1421, USA 4Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 5Ionizing Radiations Laboratory, University of Salamanca, Spain 6INFN Padua, Padua, Italy 7CSIC-IFIC, Valencia, Spain Thank you! T. Marchi INPC 2013 Florence June 6, 2013