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.

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Presentation transcript:

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

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

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

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

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

68 Ni 69 Ni 67 Ni 69 Cu 70 Cu 68 Cu 67 Co 68 Co 66 Co 66 Fe 67 Fe 70 Zn 71 Zn 69 Zn 70 Ni 71 Cu 69 Co 68 Fe 72 Zn 66 Ni 67 Cu 65 Co 68 Zn 65 Fe 64 Fe Case 2 : 67,68,69 Co Why Cobalt ? Bridges the gap between spherical Ni isotopes and deformed region south of 68 Ni 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 67 Co ! Even though not very exotic, they’re not known ! Complementary to available  -decay data on 67 Fe and 67,68 Mn  67,68 Fe – unique for 69 Co How ? Very feasible – yields of 68,69,70 Ni are good (ex. 70 Ni ≈ 1000/s for 86 Kr fragmentation) ! Double fragmentation of the A ≥ 68 Ni isotopes (potentially with plunger ?)

68 Ni 69 Ni 67 Ni 69 Cu 70 Cu 68 Cu 67 Co 68 Co 66 Co 66 Fe 67 Fe 65 Fe 70 Zn 71 Zn 69 Zn 70 Ni 71 Cu 69 Co 68 Fe 72 Zn 66 Ni 67 Cu 65 Co 64 Fe 68 Zn P. Adrich et al., PRC 77, (2008) MeV.A 470 mg/cm 2 9 Be 69 Co + 70 Ni secondary beams on 188 mg/cm 2 9 Be SEGA array (  = 2%, FWHM ≈ 2-3% at 1 MeV) 2009 : 68 Mn  -decay at ISOLDE Case 2 : 67,68,69 Co 68 Fe Compare  -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) 76 Ge beam at GSI ?