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In-beam and isomer spectroscopy in the third island of inversion at EXOGAM+VAMOS

In-beam and isomer spectroscopy in the third island of inversion at EXOGAM+VAMOS. E.Clément (GANIL). Weakness of the N=40 shell gap M. Bernas et al., PLB 113 (1982) R.Broda et al., PRL 74 (1995) O.Sorlin et al.,PRL 88 (2002) C. Guénaut et al., PRC 75 (2007). 70 Zn.

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In-beam and isomer spectroscopy in the third island of inversion at EXOGAM+VAMOS

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  1. In-beam and isomer spectroscopy in the third island of inversion at EXOGAM+VAMOS E.Clément (GANIL)

  2. Weakness of the N=40 shell gap M. Bernas et al., PLB 113 (1982) R.Broda et al., PRL 74 (1995) O.Sorlin et al.,PRL 88 (2002) C. Guénaut et al., PRC 75 (2007) 70Zn Presence of single particle, collective and core-coupled states. I.Stefanescu et al., PRL 100 (2008) 69Cu 68Cu 70Cu 70Ni Core polarization O. Perru et al., PRL 96 (2006) 65Co Presence of core coupled states : Fe-like and Ni-like D.Pauwels et al., PRC 79 (2009) A.Dijon et al, PRC 83 (2011) 67Ni 68Ni 69Ni 64Fe 66Fe 65Fe 67Fe 67Co Onset of deformation in Fe isotopes J.Ljungvall et al., PRC 81 (2010) W.Rother et al., PRL 106 (2011) 63Mn 68Co 66Co 64Mn 65Mn

  3. 69Cu : p(2p-1h) • Single particle state by B(E2) measurement • (I.Stefanescu et al., PRL 100 (2008) ) 70Zn 69Cu 68Cu 70Cu • 68Ni must present a p(2p-2h) • intruder state with • E(p(2p-2h) )=E(p(2p-1h) )+E(p(1p-2h)) 67Ni 68Ni 69Ni 70Ni 0+ state (D.Pauwels et al . PRC 82 (2010)) 69Co 67Co 68Co 66Co • 67Co : p(1p-2h) • Shape isomerat N=40 : proton intruder state p (p1/2)+1 (D.Pauwels et al . PRC 78 (2008)) 66Fe 65Fe 67Fe 65Mn p(2p-2h) intruder states at low energy  π-νresidual energy.

  4. 2 Ge Eurogam phase 1 + 2 Ge EXOGAM detectors No Dipole Sed2 Sed1 70Zn target 11 EXOGAM Ge detectors Ionisation chamber (3 pads) + 4 Si detectors 45° 238U 6.33 A MeV Q2 Q1 MWPC VAMOS Spectrometer Z identification ∆M/M=1.2% ∆Z/Z =1.1% counts M identification

  5. A. Dijon et al, to be submitted very soon … Prompt 69Cu 67Ni 68Ni 69Ni 168(1) keV T1/2=216 +65/-50 ns Isomer Isomer PRELIMINARY

  6. Gated on transitions in 67Ni Gated on the 168 keV transition  Observed just for Z=28 Gated on transitions in 69Cu Gated on transitions in 69Ni

  7. A. Dijon et al, to be submitted very soon … Prompt 69Cu 67Ni 68Ni 69Ni 168(1) keV T1/2=216 +65/-50 ns Isomer

  8. Prompt Prompt 69Cu 67Ni 68Ni 69Ni 168(1) keV T1/2=216 +65/-50 ns Isomer Compatible with small B(E2) value

  9. 4+1 5-2 5-1 2+2 0+3 π(f7/2)-2 0+m2 * 70Zn(14C,16O)68Ni M. Girod et al PRC 37 (1988), at the Orsay Tandem 2+1 0+1 π(f7/2)-2 π(f7/2)-2 (p3/2)+1 575 2+ 491 (1/2-m) B(E2) =21 W.u (7/2-)g.s 0+g.s 0+ 67Co 66Fe 68Ni Shape isomer Deformed D.Pauwels et al., PRC 78 (2008) W.Rother et al., PRL 106 (2011) Remarkable agreement with the predited position from the p(1p-2h) in 67Co and p(2p-1h) in 69Cu  p(2p-2h) state  Suggest the microscopical configuration D. Pauwels et al, PRC 82, 027304 (2010) Shape Coexistence scenario

  10. 8+1 Correlationenergy : -30.9 MeV Q² = 4520 e²fm4 b ~ 0.4 … 0+m2 LSSM – LPNS : F. Nowacki, K. Sieja for A. Dijon et al, to be submitted very soon … B(E2)cal= 0.9 W.u Exp : < 1.4 W.u (E0?) 2+1 Calculated GS 0+1 0+2 neutron 0+1 Q² = 1579 e²fm4 b ~ 0.24 0+ Occupation number proton f7/2 p3/2 d5/2 f5/2 p1/2 g9/2 Correlationenergy : -7.6 MeV Q² = 899 e²fm4 b ~ 0.18 π(f7/2)-2 f7/2 p3/2 f5/2 p1/2

  11. 68Ni HFB-D1S n p × Not present in the ph-RPA calculations × Not present in the ph-RPA calculations p fully consistent QRPA calculations with D1S interaction M. Martini, S. Péru for A. Dijon et al, to be submitted very soon …

  12. The solenoid mode in this experiment shows interesting results: • Prompt and delayed gamma rays in coincidence • Lifetime of isomer • A new isomer has been identified in 68Ni • Interpreted as a 2p-2h proton intruder superdeformed state across the Z=28 major shell closure • In agreement with SM calculations using the recent LPNS interaction • In agreement with QRPA calculations • Similar microscopic configuration with 67mCo and 66Fe •  Shape coexistence in 68Ni

  13. Collaboration

  14. S.M. Lenzi, F.Nowacki, A.Poves • and K.Sieja, PRC 82 (2010) • K.Heyde and J.L. Woods, • Rev.Mod.Phys (in press) • F.Nowacki and K.Sieja for A. Dijon et al (2011) Correlationenergy : -7.6 MeV Q² = 899 e²fm4 b ~ 0.18 Correlationenergy : -30.9 MeV Q² = 4520 e²fm4 b ~ 0.4 D.Pauwels et al., PRC 82 (2010) -3.8 MeV

  15. A 0+ state ? : Looking at the past … M. Girod et al PRC 37 (1988) M. Bernas et al PLB B113,(1982) Remember, at this time the 2+ at 2033 keV was not known : the 2.20(3) MeV state interpreted as a the 2+1 state

  16. A 0+ state ? : Looking at the past … M. Girod et al PRC 37 (1988)

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