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MINIBALL g -ray Spectroscopy far from Stability Overview Physics C ase MINIBALL @ REX-ISOLDE ‚Island of Inversion‘ R

MINIBALL g -ray Spectroscopy far from Stability Overview Physics C ase MINIBALL @ REX-ISOLDE ‚Island of Inversion‘ Results Perspectives with HIE-ISOLDE Peter Reiter IKP, University of Cologne for the MINIBALL collaboration

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MINIBALL g -ray Spectroscopy far from Stability Overview Physics C ase MINIBALL @ REX-ISOLDE ‚Island of Inversion‘ R

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  1. MINIBALL g-ray Spectroscopy far from Stability • OverviewPhysicsCase • MINIBALL @ REX-ISOLDE • ‚Island of Inversion‘ Results • Perspectiveswith HIE-ISOLDE • Peter Reiter • IKP, University of Cologne • for the MINIBALL collaboration • Nuclear Structure and Dynamics Opatija, Croatia, July 9. – 13., 2012

  2. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives Shell Model Physics with MINIBALL@REX-ISOLDE “Island of inversion” N=20 Coulomb excitation & transfer reactions (Darmstadt, Cologne, Munich) 28,29,30Na 29,30,31,32Mg Phys. Lett. B, 700 ( 2011) 181 Phys. Rev. Lett. 105, 252501 (2010) Phys. Rev. Lett. 103, 012501 (2009) Phys. Rev. Lett. 94, 172501 (2005) Towards the doubly magic 78Ni with Coulomb excitation and nucleon transfer reactions around 68Ni (CERN, Leuven, Munich) 66,67,68Ni 67,68,69,70,71,73Cu 72,74,76,78,79,80Zn Phys. Rev. C 84, 064323 (2011) Phys. Rev. C 82, 064309 (2010) Phys. Rev. C. 79, 014309 (2009) Phys. Rev. Lett. 100, 112502 (2008) Phys. Rev. C. 78, 047301 (2008) Phys. Rev. Lett. 99, 142501 (2007) Phys. Rev. Lett. 98, 122701 (2007) transfer reactions at N=28 (Darmstadt, Munich) 46Ar

  3. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives Shell Model Physics with MINIBALL@REX-ISOLDE Towards the doubly magic 100Sn (Lund, CERN) 106,107,108,109,110Sn 107,108In 100,102,104Cd Eur. Phys. J. A 44 (2010) 355 Phys. Rev. C 80, 054302 (2009) Phys. Rev. Lett. 101, 012502 (2008) Phys. Rev. Lett. 98, 172501 (2007) g-factors in Te isotopes (Darmstadt, Madrid) 132,134,136Te B(E2) measurements around 132Sn (Darmstadt, Munich) 122,124,128Cd 138,140,142,144Xe 140,142,148Ba

  4. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives Shapes & collectivity with MINIBALL@REX-ISOLDE Shapes and collectivity in the rare earth region (Darmstadt, Saclay, Oslo) 138,140Nd 140,142Sm 142Gd 144Dy Collectivity near Z=50 (York, Darmstadt) 116,118Te Shapes and collectivity between Kr and Sr (York, Cologne, Munich, Orsay, Grenoble, Saclay) 72Kr 88,92,94,96Kr 93,95,97,99Rb 96Sr Phys.Rev.Lett. 108, 062701 (2012) Phys.Rev.Lett. 98, 072501 (2007)

  5. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives Shapes & collectivity with MINIBALL@REX-ISOLDE Shapes and collectivity in light Po, Rn nuclei (York, Jyväskylä) 206Po 202,204Rn Octupole collectivity in heavy Rn, Ra isotopes (Liverpool) 220,222Rn 222,224Ra Shapes in Hg, Pb, Po nuclei (Liverpool, Leuven, Jyväskylä) 182,184,186,188Hg 188,190,192,194,196,198Pb 198,200,202Po

  6. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives The MINIBALL Coulomb excitation setup • segmented Si detector for particle detection (DSSSD) • 16 rings (front side) • 96 strips (back side) • angle coverage: θlab = 16-55° • ΔE-E measurement possible (pad)

  7. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives RIB production at ISOLDE • RIB Production: • 1,4 GeVprotons • varioustargets • ionization • massseparation in GPS/HRS • 800 RIBs available

  8. 6- 6- 722  1+ 242 68Cu  1+ 0 101  3-  6- 0  1+ (g.s.) 6- (g.s.) 3- 70Cu 1+ Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Isomericbeams @ ISOLDE • techniquebased on in-sourcelaserspectroscopy • (U. Köster et al., NIM B160, 528 (2000), L. Weissman et al., PRC 65, 024315 (2000)) • setthelaserfrequencytoselectandmaximizetheproduction • ofthe isomer ofinterest g-Spectroscopy withCu isomer beams: I. Stefanescuet al. PRL 98, 122701 (2007), E. Rapisarda et al. PRC 84, 064323 (2011)

  9. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitation of isomeric states of 70Cu Systematics of 6- 4- transition SMI Calculations by N. Smirnova SMII Calculations by K. Sieja • hybrid interaction (S.Lenziet al., PRC82, 05430(2010)) • model space:1f7/2 1f5/2 2p3/2 2p1/2protons • 1f5/22p3/22p1/21g9/22d5/2neutrons 48Ca inert core • realistic interaction (M. Hjorth-Jensen et al., Phys.Rep.26 (2004) • model space: 1f5/2 2p3/2 2p1/2 1g9/2 • outside 56Ni inert core; 2d5/2 1g9/2 2p1/2 2p3/2 1f5/2 Neutrons excitations across N=50 1g9/2 2p1/2 2p3/2 1f5/2 • NO proton-core excitations • NO neutron-core excitations Proton excitations across Z=28 1f7/2 N=28 Z=28 N=28 Z=20

  10. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives • Charge breeding: • coolingandbunchingofthe • RIB in theREXTRAP • breedingtohighercharge • states in theEBIS to A/q<4.5 • breeding time upto 400 ms • A/q selection RIB preparation @ REX-ISOLDE • Re-acceleration • accelerationoftheions in the • REX-LINAC • beam energy: 0,8-3,0 MeV/u • AccelerationuptoRa achieved

  11. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 224Ra (+120Sn) Coulomb excitation - Heaviest REX-ISOLDE beam - B(E3, 0+↦3-) P.A. Butler1, L.P. Gaffney1, M. Scheck1,2, F. Wenander3, for the IS475 collaboration 1University of Liverpool, UK , 2Technical University Darmstadt, Germany, 3CERN-ISOLDE

  12. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 30,31,32Mg, 30Na 0p0h, spherical 2p2h (intruder), deformed 2+ p3/2 p3/2 f7/2 f7/2 2+ E2 20 d3/2 E2 d3/2 s1/2 s1/2 0+ 0+ d5/2 d5/2   32Mg… 38Mg 30Mg E.K. Warburton, J. A. Becker and B. A. Brown, PRC 41 (1990) 1147. T. Motobayashi, et al.; PLB 346 (1995) P Doornenbal et al

  13. nd3/2 + nf7/2 - Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives inversion normal sd configurations ??? 0+ 0+ 2+ 2+ E2 E0 E2 intruder fp configurations 0+ 0+ 30Mg 32Mg 31Mg Wherearetheborders? Howdoestransitionintoislandofinversionoccur ? Doespictureofshapecoexistence hold?

  14. Neutron number Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitationof30,32Mg ‚Safe‘ energy Coulomb excitationat 2.25 MeV/u MINIBALL measureswithsmalluncertainty B(E2) valuesfromfirstexcited 2+states to ground state in 30,32Mg H. Scheit et al; in prep. M. Seidlitz et al; Phys. Lett. B 700 (2011) 181 O. Niedermeier et al. Phys. Rev. Lett. 94, 172501 (2005)

  15. nd3/2 + nf7/2 - Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives g-factor and spin of the 31,33Mg ground state • laser spectroscopy and b-NMR • g-factor and spin for 31Mg and 33Mg • from sign of g-factor  parity • 31Mg, Ip = 1/2+n(sd)-3 (fp)2 • 33Mg, Ip = 3/2- n(sd)-2(fp)3 • pure 2p-2h intruder ground states ! 20 Al Al Al Al Al Al Al Al Al 28 29 30 31 32 33 34 35 36 Mg Mg Mg Mg Mg Mg Mg Mg Mg 27 28 29 30 31 32 33 34 35 Normal ground state configurations: Intruder ground state configurations: 31Mg (N=19) 31Mg (N=19) 33Mg (N=21) 33Mg (N=21) pf f7/2 Ip=1/2+ Ip=3/2- 20 20 20 20 Ip=3/2+ Ip=7/2- d3/2 d3/2 sd Renewed b-decay studies G. Neyens et al., PRL 94, 022501 (2005) D. Yordanov et al., PRL 99, 212501 (2007) 31Mg F. Maréchal et al., PRC 72, 044314 (2005) 33Mg V. Tripathi et al., PRL 101, 142504 (2008)

  16. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitation31Mg

  17. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 31Mg Results • G. Neyens, Phys. Rev. C 84, 064310 (2011) • M. Kimura, Phys. Rev. C 75, 041302(R) (2007) M. Seidlitz et al; PLB 700 (2011) 181

  18. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitation of 30Na, higherlyingstates? backgroundsubtracted, Doppler correctedfor30Na 30Na ((3+) → 2+) 30Na ((4+) → (3+)) 30Na ((4+) → 2+) beamtime: 80hours beam intensity: 550 ions/sec more beam time Oct. 2012 B(E2, 2+ → (4+)) = 108 (33) e2fm4 (preliminary!) theoretical predictions: B(E2, 2+ → 4+) = 90 e2fm4

  19. nd3/2 + nf7/2 - Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives inversion normal sd configurations ??? 0+ 0+ 2+ 2+ E2 E0 E2 intruder fp configurations 0+ 0+ 30Mg 32Mg 31Mg Doespicture of shapecoexistence hold?

  20. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Shape coexistence in 30Mg 0+ 0+ 2 2 0+ 0+ 1 1 30Mg 32Mg - electron spectroscopy after b-decay at ISOLDE - first excited 0+ state at 1789 keV in 30Mg W. Schwerdtfeger, et al; PRL 103, 012501 (2009)

  21. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives The MINIBALL T-REX setup T-REX: Si detectorarrayforTransfer experimentsatREX-ISOLDE • large solid angle (58% of 4π) • position sensitive • PID (ΔE-E): p, d, t, α, • … and e- from β-decay (!) Technical details: Barrel: 140 mm ΔE / 16 resistivestrips 1000 mm E / pad Backward CD: 500 mm ΔE / DSSSD 500 mm E / pad RIB V. Bildstein, K. Wimmer, Th. Kröll, R. Gernhäuser et al. (fundedby TU München, KU Leuven, U Edinburgh, CSNSM Orsay, TU Darmstadt)

  22. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives t(30Mg, 32Mg)p – two-neutrontransfer • 3H loadedTifoil (40 mg/cm23H, 10 GBq) • 30Mg @ 2 MeV/u • 4·104part/s / 150 h beam on target • Q00 = -295(20) keV • Twostatespopulated: groundstateand • newstateat 1083(33) keV K. Wimmer et al; PRL 105, 252501 (2010)

  23. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 0+ 2+ 0+ 2+ E2 E0 E2 0+ 0+ 32Mg 30Mg intruder fp configurations 0+ 2719 normal sd configurations K. Heyde, J.L. Wood, REV. OF MOD. PHYS., Vol 83, (2011) 1467 S. Grévy et al,; ARIS2011 proceedings

  24. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) preliminary J. Diriken, P. van Duppen, R. Raabe, et al.; IKS-KU Leuven for the IS469 collaboration

  25. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) preliminary • proton gated g-spectrum • g-transitions up to 5800 keV • p-g-g- coincidence analysis J. Diriken, P. van Duppen, R. Raabe, et al.; IKS-KU Leuven for the IS469 collaboration

  26. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives d(66Ni,67Ni)p – the 68Ni region (N=40) shell closure at N=40? preliminary Ex [keV] Ex=3600(250) keV NNDC Eg=3619(30) keV Eg [keV] High resolution of MINIBALL allows to resolve states and to analyse angular distribution J. Diriken, P. van Duppen, R. Raabe, et al.; IKS-KU Leuven for the IS469 collaboration

  27. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives HIE-ISOLDE • intensity upgrade • energy upgrade 1.2 MeV/u 3 MeV/u 5.5 MeV/u 2014 8 MeV/u 10 MeV/u 2016

  28. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives Transfer reactions at HIE-ISOLDE Higher energies at HIE-ISOLDE will be favorable fortransferreactionstudies withheavy beams! Show caseexample: d(132Sn,133Sn)p SeveralHIE-ISOLDE LoIsbased on MINIBALL & T-REX: - shell evolution - shapecoexistence - pairingcorrelationsó pair transfer - nuclearastrophysics: (d,p) ó (n,g) capture reactions Upgrade of T-REX -> flexible geometry of Si detectors Fusion vetodetector Spectrometerto identify heavy transferproducts FRESCO calc‘sby K. Wimmer (NSCL, MSU)

  29. Outline - Physicscase- MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives • Summary • MINIBALL spectrometer very well • suited for REX-ISOLDE • Physics case covers the range • from 17F to 224Ra • First years: Shell model physics and • Coulomb excitation • Recent developments: • - isomeric and heavy beams • - T-REX transfer reactions & • g-ray spectroscopy • Major perspective: HIE-ISOLDE l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l

  30. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives HIE-ISOLDE • MINIBALL + T-REX • New instrumentation: • MAYA/ACTAR active target • SPEDE - SPectrometer for Electron DEtection in radioactive beam • HELIOS superconducting magnet for charged particle detection • PARIS (Photon Array for studies with Radioactive Ion and Stable beams) • GASPARD (GAmmaSpectroscopy and PArticleDetection) • Neutron detectors • TSR storage ring • Magnetic spectrometer or separator for channel selection • Mark Huyse, IKS K.U. Leuven ISOLDE workshop 2010

  31. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives ‚Island of Inversion‘ First and recentresults from ISOLDE masses show considerable deviations for nuclei around Z=11, N=20.  additional binding energy C. Thibault, et al.; PRC 12 (1975) 644 Charge radii differences from isotope shift measurement D.T. Yordanov, et al.; PRL 108 (2012) 042504

  32. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives RIB preparation @ REX-ISOLDE • Charge breeding: • coolingandbunchingofthe • RIB in theREXTRAP • breedingtohighercharge • states in theEBIS to A/q<4.5 • breeding time upto 400 ms • A/q selection Possibility of in-trap decay during charge breeding: 61Mn →61Fe J. Van de Walle et al., CERN-INTC-2009-006 (2009)

  33. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 6-fold segmented, encapsulated MINIBALL detector Collaboration: Köln, Heidelberg, München, Leuven

  34. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Preamplifier IKP Köln MPI-K Hd Digital highresolutionspectroscopyelectronics 40 MHz digitizer: DGF 4C Company XIA Triple clusterdetector 3 x core + 3 x 6 segments IKP Köln and CTT

  35. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Pulse shapeanalysis and positionsensitivity in-beam data: (line width after Doppler correction)Abs. Eff. 8 %, ΔΘ = 3.30

  36. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Deviations from classical shell model

  37. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives g.s. occupationnumbersusingeffective USD / SDPF-M interactions: B. H. Wildenthal, Prog. Part. Nucl. Phys. 1, 5 (1984)T. Otsuka et al., Prog. Part. Nucl. Phys. 47, 319 (2001) Transfer togroundstate in 32Mg • Transfer toexcited 0+statein 32Mg • Transfer togroundstate in 32Mg • pure transferto (f7/2)2tosmall • large contributionfrom (p3/2)2needed (a > 0.7) • SDPF-M underestimates the np3/2content in the wavefunctions • Transfer toexcited 0+state in 32Mg • wavefunctionsimilartog.s. in 30Mg • two-neutronspectroscopicamplitudesfor pure • sd → sdtransitions • crosssectionunderestimated, small (p3/2)2amplitude (a ≈ 0.3) a K. Wimmer et al; PRL 105, 252501 (2010)

  38. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Shape coexistence in 30Mg • electric monopole (E0) transition to ground state: • r2(E0)= (26.2 (7.5)) x 10-3 • beyond-mean-field calculations with Gogny force: • two competing configurations, small mixing • largely different intrinsic quadrupole deformation • ground state: 1d3/2 neutrons • first excited 0+ state: 1f7/2 neutrons • predictions for 32Mg W. Schwerdtfeger, et al; PRL 103, 012501 (2009)

  39. Laser OFF Laser ON Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Beam quality, monitoring, quantitative composition Measuredwithionizationchamber (ΔE-Erest) atthe MINIBALL beam dumpposition

  40. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives Short term perspectives • 2011 campaign • - Coulexexperiments: • 188;..,198Pb, 140Nd, 96Kr, 220Rn, 208Rn, 128Cd, 72Kr, 30Na, 98Sr • - transfer experiments • g-factor measurements • Discussion of physics campaign during CERN shut down period • MINIBALL workshop • University of Cologne • 27.-28. February or March 5.-6. March 2012. • 2012 campaign • 2013 CERN shut down

  41. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives t(44Ar,46Ar)p – probing N=28 Weakening of N=28 closurebelow48Ca? èonset of deformation / shapecoexistence? Searchfor the second 0+ state g-rays in coincidence with protons Identified protons Transfer to gs of 46Ar Analysis byK. Nowak, TU München) Spokesperson: K. Wimmer

  42. Neutron number Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitationof30,32Mg ‚Safe‘ energy Coulomb excitationat 2.25 MeV/u MINIBALL measureswithsmalluncertainty B(E2) valuesfromfirstexcited 2+states togroundstate in 30,32Mg O. Niedermeier, et al., Phys. Rev. Lett. 94, 172501 (2005)

  43. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives 30,31,32Mg, 30Na 0p0h, spherical 2p2h (intruder) 2+ p3/2 p3/2 f7/2 f7/2 2+ E2 20 d3/2 E2 d3/2 s1/2 s1/2 0+ 0+ d5/2 d5/2 886 660 660   32Mg 30Mg 792 722 E.K. Warburton, J. A. Becker and B. A. Brown, PRC 41 (1990) 1147. T. Motobayashi, et al.; PLB 346 (1995) 9

  44. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives collective properties of 31Mg - b-decay studies of 31Mg at GANIL - shell model calculation sd-fpvalence space ANTOINE code, effective interaction SDPF-NR collective properties of positive K=1/2 rotational band of 31Mg: excitation energy, quadrupole moment Q, B(E2), magnetic moment μ, B(M1) F. Maréchalet al., Phys. Rev. C 72, 044314 (2005) M. Kimura, Phys. Rev. C 75, 041302(R) (2007)

  45. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives GOSIA Coulexcalculation • Results: • one step E2 excitation • decay of (5/2+,3/2+) level via M1 transition • results confirms strong collectiveexcitation • - rotational sequence: 1/2+ → 3/2+ → 5/2+ B(E2, 1/2+→5/2+) = 182 e2fm4 B(M1, 5/2+→ 3/2+)=0.1 – 0.5 µn2 M. Seidlitz et al; PLB 700 (2011) 181 • M. Kimura, Phys. Rev. C 75, 041302(R) (2007)

  46. ? ? (3+) (5/2+) Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives The „Island of Inversion“ Collective properties of the Na-Isotopes Y. Utsuno, et al., Phys. Rev. C70, 044307,2004 B(E2, 3/2+ → (5/2+)) = 140 (25) e2fm4 (Hurst et al., Phys. Lett. B 674, 168-171, 2009) B(E2, 2+ → (3+)) = 147 (21) e2fm4 (Ettenaueret al., Phys. Rev. C 78, 017302, 2008) theoretical predictions: B(E2, 3/2+ → 5/2+) = 111-135 e2fm4 B(E2, 3/2+ → 7/2+) = 57 e2fm4 theoretical predictions: B(E2, 2+ → 3+) = 168 e2fm4 B(E2, 2+ → 4+) = 90 e2fm4

  47. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Coulomb excitation of 30Na, higherlyingstates? backgroundsubtracted, Doppler correctedfor30Na 30Na ((3+) → 2+) 30Na ((4+) → (3+)) 30Na ((4+) → 2+) measuring time: 80hours beam intensity: 550 ions/sec Follow up beam time Oct. 2012 B(E2, 2+ → (4+)) = 108 (33) e2fm4 (preliminary!) theoretical predictions: B(E2, 2+ → 4+) = 90 e2fm4

  48. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives GOSIA Coulexcalculation • Results: • one step E2 excitation • decay of (5/2+,3/2+) level via M1 transition • results confirms strong collectiveexcitation • - rotational sequence: 1/2+ → 3/2+ → 5/2+ B(E2, 1/2+→5/2+) = 182 e2fm4 B(M1, 5/2+→ 3/2+)=0.1 – 0.5 µn2 M. Seidlitz et al; PLB 700 (2011) 181 • M. Kimura, Phys. Rev. C 75, 041302(R) (2007)

  49. Outline - Physicscase- MINIBALL@REX-ISOLDE -Island of Inversion - Perspectives Shape coexistence in 30Mg • electric monopole (E0) transition to ground state: • r2(E0)= (26.2 (7.5)) x 10-3 • beyond-mean-field calculations with Gogny force: • two competing configurations, small mixing • largely different intrinsic quadrupole deformation • ground state: 1d3/2 neutrons • first excited 0+ state: 1f7/2 neutrons • predictions for 32Mg W. Schwerdtfeger, et al; PRL 103, 012501 (2009)

  50. Outline - Physicscase- MINIBALL@REX-ISOLDE- Island of Inversion - Perspectives Short term perspectives • 2011 campaign • - Coulexexperiments: • 188;..,198Pb, 140Nd, 96Kr, 220Rn, 208Rn, 128Cd, 72Kr, 30Na, 98Sr • - transfer experiments • g-factor measurements • Discussion of physics campaign during CERN shut down period • MINIBALL workshop • University of Cologne • 27.-28. February or March 5.-6. March 2012. • 2012 campaign • 2013 CERN shut down

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