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Nuclear structure around 68 Ni J. Van de Walle, N. Kalantar et al. KVI Groningen

Nuclear structure around 68 Ni J. Van de Walle, N. Kalantar et al. KVI Groningen. 69 Zn. 70 Zn. 71 Zn. 68 Zn. 72 Zn. 68 Cu. 69 Cu. 70 Cu. 67 Cu. 71 Cu. 68 Ni. 67 Ni. 69 Ni. 66 Ni. 70 Ni. 66 Co. 67 Co. 68 Co. 65 Co. 69 Co. 66 Fe. 67 Fe. 68 Fe. 65 Fe. 64 Fe.

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Nuclear structure around 68 Ni J. Van de Walle, N. Kalantar et al. KVI Groningen

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  1. Nuclear structure around 68Ni J. Van de Walle, N. Kalantaret al. KVI Groningen 69Zn 70Zn 71Zn 68Zn 72Zn 68Cu 69Cu 70Cu 67Cu 71Cu 68Ni 67Ni 69Ni 66Ni 70Ni 66Co 67Co 68Co 65Co 69Co 66Fe 67Fe 68Fe 65Fe 64Fe • Some ideas inspired by : • Cu isotopes – collective and single particle properties (Leuven group) • The excursion to a “new island of inversion” south of 68Ni • The fact that spectroscopy of n-rich Fe, Co isotopes at ISOL facilities is difficult ! • Recent results from Mn and Fe b-decay at ISOLDE & LISOL • Boundary conditions : • 1/ Complementarity • 2/ Feasibility • 3/ Uniqueness

  2. 69Zn 70Zn 71Zn 68Zn 72Zn Case 1 : 75Cu 68Cu 69Cu 70Cu 72Cu 74Cu 67Cu 71Cu 73Cu 75Cu 68Ni 67Ni 69Ni 66Ni 70Ni • Monopole migration of single particle levels 7/2- 7/2- 5/2- 3/2- 1/2-

  3. 69Zn 70Zn 71Zn 68Zn 72Zn Case 1 : 75Cu 68Cu 69Cu 70Cu 72Cu 74Cu 67Cu 71Cu 73Cu 75Cu 68Ni 67Ni 69Ni 66Ni 70Ni • Monopole migration of single particle levels • Particle-core coupled model Nickel 2+  3/2- = 1/2- ,3/2-,5/2-, 7/2- “weak coupling model” Nickel Ji=2+ 7/2- 5/2- 3/2- 1/2-

  4. 69Zn 70Zn 71Zn 68Zn 72Zn Case 1 : 75Cu 68Cu 69Cu 70Cu 72Cu 74Cu 67Cu 71Cu 73Cu 75Cu 68Ni 67Ni 69Ni 66Ni 70Ni • Monopole migration of single particle levels • Particle-core coupled model Nickel 2+  3/2- = 1/2- ,3/2-,5/2-, 7/2- “weak coupling model” Nickel Ji=2+ 7/2- 5/2- 3/2- 1/2-

  5. 76Zn 69Zn 70Zn 71Zn 68Zn 72Zn Case 1 : 75Cu 68Cu 69Cu 70Cu 72Cu 74Cu 67Cu 71Cu 73Cu 75Cu 68Ni 74Ni 67Ni 69Ni 66Ni 70Ni • Monopole migration of single particle levels • Particle-core coupled model • CONCLUSION : •  Intermediate energy coulex of 74Ni and/or75Cu ? •  Plunger with proton knock-out from 76Zn instead of 75Cu ? Nickel 2+  3/2- = 1/2- ,3/2-,5/2-, 7/2- “weak coupling model” Nickel Ji=2+ 7/2- 5/2- 3/2- 1/2-

  6. Case 2 : 67,68,69Co 69Zn 70Zn 71Zn 68Zn 72Zn 68Cu 69Cu 70Cu 67Cu 71Cu 68Ni 67Ni 69Ni 66Ni 70Ni 66Co 67Co 68Co 65Co 69Co 66Fe 67Fe 68Fe 65Fe 64Fe • Why Cobalt ? • Bridges the gap between spherical Ni isotopes and deformed region south of 68Ni • Structure is subtle mixture of single particle states, deformed states • “Challenge for Shell Model” : structure depends crucially on N=40 and Z=28 gaps ! • Isomers are likely to occur … detectors around LYCCA ? • Spectroscopic information only up to 67Co ! Even though not very exotic, they’re not known ! • Complementary to available b-decay data on 67Fe and 67,68Mng67,68Fe – unique for 69Co • How ? • Very feasible – yields of 68,69,70Ni are good (ex. 70Ni ≈ 1000/s for 86Kr fragmentation) ! • Double fragmentation of the A ≥ 68 Ni isotopes (potentially with plunger ?)

  7. 69Zn 70Zn 71Zn 68Zn 72Zn Case 2 : 67,68,69Co 68Cu 69Cu 70Cu 67Cu 71Cu 2009 : 68Mn b-decay at ISOLDE 521 68Ni 67Ni 69Ni 66Ni 70Ni 68Fe 865 1515 1250 66Co 67Co 68Co 65Co 69Co 65Fe 66Fe 67Fe 64Fe 68Fe • Compare b-decay at ISOLDE and • double fragmentation at MSU … • Plunger not considered in LOI ! • Fe lifetime measurements done at • Legnaro/GANIL/MSU already ! • Co not ( … so far) • 76Ge beam at GSI ? P. Adrich et al., PRC 77, 054306 (2008) • 76Ge @ 130 MeV.A • 470 mg/cm2 9Be • 69Co + 70Ni secondary beams on 188 mg/cm29Be • SEGA array (e = 2%, FWHM ≈ 2-3% at 1 MeV)

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