Investigation of neutron rich Cd isotopes and test of the valence proton symmetry
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1 Investigation of neutron rich Cd isotopes and test of the valence proton symmetry AGATA Physics Workshop 2010, Istanbul, Turkey C. Fransen, A. Dewald, A. Blazhev, N. Braun, B. Bruyneel, M. Gorska, M. Hackstein, H. Iwasaki, J. Jolie, A. Jungclaus, T. Kröll, R. Krücken, R. Orlandi, P. Petkov, T. Pissulla, P. Reiter, W. Rother Measurement of B(E2,01+ > 21+) values in 124,126Cd with Determination from lifetimes measured with RDDS with new Cologne differential plunger. Cd: B(E2,21+ > 01+) known from Coulomb excitation, but check with 124 model independent technique and higher precision. Cd: preliminary value B(E2,21+ > 01+) from Coulex test experiment. 126 Feasibility to measure 21+ lifetime precisely with RDDS. Institut für Kernphysik, Universität zu Köln
2 Motivation (1) Investigate collectivity when approaching N=82 B(E2,21+ > 01+) related to nuclear quadrupole deformation Milestone in understanding properties of these nuclei Pd Xe Cd Anomalous behavior of 2+ excitations in n rich Cd Low 2+ excitation energy in 128Cd consequence of doubly magic character for oblate deformation favoring prolate configurations Rodriguez, Luis Egido, Jungclaus, PLB 668, 410 (08): beyond mean field techniques, gogny force Te
3 neutrons Motivation (1) B(E2,01+ > 21+)=( ) E 1 Z2 A 2/3 (for A > 60) S. Raman et al., Phys. Rev. C 43, 556 (1991) protons 124 Cd: β2 = 0.16 (Raman) = 0.14 (Coulex, Kröll) 126 Cd: β2 = 0.15 (Raman) = 0.12 (Coulex, Kröll) 128 Cd: β2 = 0.15 (Raman) T. Kröll et al., FINUSTAR 2, AIP CP 1012, 84 (08)
4 Motivation (2) Systematics of heavy Cd isotopes: Kautsch et al., Eur. J. Phys. A9, 201 (00): weakening of shell gap at N=82 for Z=50+ 2 already one proton pair below 132Sn B(E2,01+ > 21+)=( ) E 1 Z2 A 2/3 (for A > 60) Kautsch et al., Eur. J. Phys. A9, 201 (00) S. Raman et al., Phys. Rev. C 43, 556 (1991) Exp. data T. Kröll et al., FINUSTAR 2 AIP CP 1012, 84 (08)
5 Motivation (3) Valence proton symmetry 122 Cd Cd Pd Xe Cd Cd Valence proton symmetry: nuclei X,Y with same N and same valence proton number/holes have equal collective properties Zm Zx = Zm Zy = Nπ identical spectra and transistion probabilities Te B(E2) values described by Scaling factor But: deviation from VPS for lighter Cd isotopes: possibly caused by configuration mixing of quadrupole anharmonic vibration and intruder K. Heyde, Phys. Rev. C 25, 3160 (82) Data for n rich Cd isotopes from Coulex T. Kröll et al., FINUSTAR 2, AIP CP 1012, 84 (2008) > but: cannot exclude possible systematic errors
6 Motivation (4) Aim: determine B(E2;01+ > 21+) in 124,126Cd with RDDS with precision better than 10% Measurements performed on REX ISOLDE with safe Coulex (2.85 MeV/u) Proposed experiment: Coulex with Ebeam ~ 200 MeV/u, thus large Doppler shifts need good resolution which is provided by AGATA Expect larger cross sections of mbarn Establish this new technique (Plunger+Coulex) at GSI Success of this method already proven in experiments at NSCL/MSU: n rich Fe, Pd,...
7 Plunger technique at intermediate energy with coulex: NSCL, MSU Example: 110,114Pd E~70 MeV/u Diamond detector for TOF 114 E ~60 MeV/u D Pd β= E ~44 MeV/u C 500 µm β =0.298 β =0.343 Nb 100 µm Eγ Eγ to S800 for particle identification to the γ ray detector 21+ > 01+ Example: 114 Pd spectra after projectile Coulex at 3 different target degrader separations (SeGA array, MSU), β=0.35 Lineshape analysis: Pd: 114 τ =118 (20) ps 110 Pd: τ=67 (8) ps A. Dewald et al, Phys. Rev C 78, (R), 2008
8 LISE++ simulation: PRESPEC ~ 5 cm Large beam diameter > 40 mm + halo
9 Existing plunger devices for radioactive beams MSU plunger LNL/GANIL plunger degrader target/ degrader diameter: 4 cm target/ degrader separations: cm precision : ~ 1 μm target/ degrader thickness: ~1μm 1mm piezo crystal 0 30 μm ; feed back target Tesa; inductive transducer 0 20 μm +/ 0.1 μm μm +/ 1 μm inchworm motor Construction for new GSI plunger based on this concept
10 Differential plunger technique: proposed PRESPEC Kinematics for 124Cd
11 Differential plunger technique: proposed PRESPEC
12 Results of a LISE++ calculation (1)
13 Results of a LISE++ calculation (2)
14 Collaboration C. Fransen, A. Dewald, A. Blazhev, N. Braun, T. Braunroth, B. Bruyneel, M. Hackstein, J. Jolie, T. Pissulla, P. Reiter, W. Rother Institut für Kernphysik, Universität zu Köln, Cologne, Germany M. Gorska and the PRESPEC collaboration GSI, Darmstadt, Germany T. Kröll, R. Krücken TU München, Garching, Germany A. Jungclaus, R. Orlandi IEM CSIC, Madrid, Spain P. Petkov INRNE, Sofia, Bulgaria H. Iwasaki NSCL, MSU, East Lansing MI, USA Institut für Kernphysik, Universität zu Köln
15
16 Plunger at GSI: PRESPEC/LYCCA > HISPEC
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