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Sarah Naimi

ISOLDE Workshop 2009. Nuclear structure oddities from ISOLTRAP mass measurements. Sarah Naimi. CSNSM Orsay & ISOLTRAP/ISOLDE CERN. ISOLDE Workshop 2009. Plan Experimental setup Shell closure at N = 40 Mn isotopes masses Kr isotopes : deformation from N = 60? Summary and outlook.

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Sarah Naimi

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  1. ISOLDE Workshop 2009 Nuclear structure oddities from ISOLTRAP mass measurements Sarah Naimi CSNSM Orsay & ISOLTRAP/ISOLDE CERN

  2. ISOLDE Workshop 2009 • Plan • Experimental setup • Shell closure at N = 40 • Mn isotopes masses • Kr isotopes : deformation from N = 60? • Summary and outlook

  3. 2 m Bunching of the continuous beam ISOLTRAP: Experimental setup B = 5.9 T B = 4.7 T G. Bollen, et al., NIM A 368, 675 (1996) F. Herfurth, et al., NIM A 469, 264 (2001)

  4. 2 m Removal of isobaric contaminants B = 5.9 T B = 4.7 T Buffer gas cooling with QP excitation: Savard et al., Phys. Lett. A 158, 247 (1991) removal of contaminant ions (R = 105) G. Bollen, et al., NIM A 368, 675 (1996) F. Herfurth, et al., NIM A 469, 264 (2001)

  5. 2 m ISOLTRAP: Experimental setup determination of cyclotron frequency (R = 107) B = 5.9 T 66Mn B = 4.7 T 97Kr : 63(3) ms (preparation trap) 66Mn : 64.4(1.8) ms (Record at Isoltrap!!!)

  6. Introduction : Masses and nuclear structure

  7. Shell closure at N = 40 ? Harmonic oscillator : 2, 8, 20, 40, 70… Spin orbit : 2, 8, 20, 28, 50, 82… 50 40 O. Sorlin et al, PRL. 88, 092501 (2002): 68Ni • possibility of new magic number at N = 40 C. Guénaut et al, PRC 75, 044303 (2007) : neutron rich Ni, Cu, Ga mass measurements at Isoltrap  No evidence of shell closure at N = 40

  8. Shell closure at N = 40 ?

  9. A ≈ 100 Region Large deformation in the Zr region Quantum nuclear phase transition Iachello, PRL, 87, 5(2001) D. A. Arseniev et al, Nucl. Phys. A139, 269 (1969) P. Federman and S. Pittel, PRC, 20, 820 (1979) 40 39 38 37 36 Z = N = 60

  10. Kr: deformation from N = 60 ?

  11. Kr: deformation from N = 60 ? S2n and charge radii correlation 95–101Y,101–107Nb mass measurements by JYFL group: U. Hager et al, Nuclear Physics A 793 (2007) 20–39 86–90,92–102Y, isomeric states 87–90,93,96,97,98YLaser spectroscopy:B. Cheal, et al., Phys. Lett. B 645 (2007) 133

  12. Kr: deformation from N = 60 ? AME 2008 - includes some JYFL data: Hakala et al. (2008) &ISOLTRAP data: Delahaye et al. (2006) Baruah et al. (2008) Kr Se Ge Zn ? #

  13. Kr: deformation from N = 60 ? HFB17 : S. Goriely, N. Chamel, and J.M. Pearson

  14. Kr: deformation from N = 60 ? Experimental results spectra from CLARA and PRISMA spectrometer N. Mărginean et al. PHYSICAL REVIEW C 80, 021301(R) (2009) 241-keV gamma ray : 2+1 0+g.s transition Moderate deformation

  15. Kr: deformation from N = 60 ? Mass measurements experimental results # of ions Freq [Hz] 96Kr Time of flight resonance in the precision trap 97Kr Cooling resonance in the preparation trap

  16. Kr: deformation from N = 60 ? Mass measurements experimental results

  17. ISOLDE Workshop 2009 • Summary • From the Mn isotopes masses • No evidence on shell closure at N = 40 • Mass measurements of 96Kr and 97Kr showed no strong sudden deformation at N = 60 •  The end of quantum nuclear phase transition in the N = 60 region

  18. ISOLDE Workshop 2009 • Outlook • Re-measure the 97Kr in the precision trap to reduce the error bars • Go further 98Kr  proposal 2009 on noble gases INTC-P-263 • More study on the n-rich medium masses

  19. ISOLDE Workshop 2009 Collaborators: G. Audi, D. Beck, K. Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, D. Fink, S.George, A. Herlert, F. Herfurth, A. Kellerbauer, H.-J. Kluge, M. Kowalska, S. Kreim, D. Lunney, E. Minaya Ramirez, S. Naimi, D.Neidherr, M. Rosenbusch, S. Schwarz, L. Schweikhard, R. Wolf Funding: BMBF, GSI, EU, IN2P3, MPI, CERN, ISOLDE

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