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MINIBALL  -ray Spectroscopy far from Stability Overview Physics Case REX-ISOLDE ‚Island of Inversion‘ Results Perspectives with HIE-ISOLDE.

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Presentation on theme: "MINIBALL  -ray Spectroscopy far from Stability Overview Physics Case REX-ISOLDE ‚Island of Inversion‘ Results Perspectives with HIE-ISOLDE."— Presentation transcript:

1 MINIBALL  -ray Spectroscopy far from Stability Overview Physics Case REX-ISOLDE ‚Island of Inversion‘ Results Perspectives with HIE-ISOLDE Peter Reiter IKP, University of Cologne for the MINIBALL collaboration Nuclear Structure and Dynamics Opatija, Croatia, July 9. – 13., 2012

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

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

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

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

6 The MINIBALL Coulomb excitation setup segmented Si detector for particle detection (DSSSD) 16 rings (front side) 96 strips (back side) angle coverage: θ lab = 16-55° ΔE-E measurement possible (pad) Outline - Physics case - - Island of Inversion - Perspectives

7 RIB production at ISOLDE RIB Production: 1,4 GeV protons various targets ionization mass separation in GPS/HRS 800 RIBs available Outline - Physics case - - Island of Inversion - Perspectives

8 Isomeric ISOLDE (g.s.) 68 Cu 6 - (g.s.) Cu     3-3-  101 technique based on in-source laser spectroscopy (U. Köster et al., NIM B160, 528 (2000), L. Weissman et al., PRC 65, (2000)) set the laser frequency to select and maximize the production of the isomer of interest  -Spectroscopy with Cu isomer beams: I. Stefanescu et al. PRL 98, (2007), E. Rapisarda et al. PRC 84, (2011) Outline - Physics case - - Island of Inversion - Perspectives

9 Z=28N=28 realistic interaction (M. Hjorth-Jensen et al., Phys.Rep.26 (2004) model space: 1f 5/2 2p 3/2 2p 1/2 1g 9/2 outside 56 Ni inert core; SMI Calculations by N. Smirnova hybrid interaction (S.Lenzi et al., PRC82, 05430(2010)) model space:1f 7/2 1f 5/2 2p 3/2 2p 1/2 protons 1f 5/2 2p 3/2 2p 1/2 1g 9/2 2d 5/2 neutrons 48 Ca inert core Coulomb excitation of isomeric states of 70 Cu SMII Calculations by K. Sieja 1g 9/2 2p 1/2 2p 3/2 1f 5/2 NO proton-core excitations NO neutron-core excitations Systematics of 6 -  4 - transition Z=20 N=28 2p 1/2 2p 3/2 1f 5/2 1f 7/2 2d 5/2 Neutrons excitations across N=50 Proton excitations across Z=28 1g 9/2

10 RIB REX-ISOLDE Re-acceleration acceleration of the ions in the REX-LINAC beam energy: 0,8-3,0 MeV/u Acceleration up to Ra achieved Outline - Physics case - - Island of Inversion - Perspectives Charge breeding: cooling and bunching of the RIB in the REXTRAP breeding to higher charge states in the EBIS to A/q<4.5 breeding time up to 400 ms A/q selection

11 Outline - Physics case - - Island of Inversion - Perspectives 224 Ra (+ 120 Sn) Coulomb excitation P.A. Butler 1, L.P. Gaffney 1, M. Scheck 1,2, F. Wenander 3, for the IS475 collaboration 1 University of Liverpool, UK, 2 Technical University Darmstadt, Germany, 3 CERN-ISOLDE - Heaviest REX-ISOLDE beam - B(E3, 0 + ↦ 3 - )

12 E.K. Warburton, J. A. Becker and B. A. Brown, PRC 41 (1990) s 1/2 f 7/2 d 5/2 d 3/2 p 3/2 f 7/2 d 3/2 p 3/2 d 5/2 s 1/2 0p0h, spherical2p2h (intruder), deformed Outline - Physics case - - Island of Inversion - Perspectives Mg E2 32 Mg… 38 Mg E T. Motobayashi, et al.; PLB 346 (1995) P Doornenbal et al 30,31,32 Mg, 30 Na

13 Mg 32 Mg ??? 31 Mg E0 E2 inversion normal sd configurations intruder fp configurations Where are the borders? How does transition into island of inversion occur ? Does picture of shape coexistence hold? d 3 /2 + f 7 /2  Outline - Physics case - - Island of Inversion - Perspectives

14 H. Scheit et al; in prep. M. Seidlitz et al; Phys. Lett. B 700 (2011) 181 O. Niedermeier et al. Phys. Rev. Lett. 94, (2005) Neutron number Coulomb excitation of 30,32 Mg ‚Safe‘ energy Coulomb excitation at 2.25 MeV/u MINIBALL measures with small uncertainty B(E2) values from first excited 2 + states to ground state in 30,32 Mg Outline - Physics case - - Island of Inversion - Perspectives

15 G. Neyens et al., PRL 94, (2005) D. Yordanov et al., PRL 99, (2007) laser spectroscopy and  -NMR g-factor and spin for 31 Mg and 33 Mg from sign of g-factor  parity 31 Mg, I  = 1/2 + (sd) -3 (fp) 2 33 Mg, I  = 3/2 - (sd) -2 (fp) 3  pure 2p-2h intruder ground states ! Al 28 Al 29 Al 30 Al 31 Al 32 Al 33 Al 34 Al 35 Al 36 Mg 27 Mg 28 Mg 29 Mg 30 Mg 31 Mg 32 Mg 33 Mg 34 Mg d 3 /2 + f 7 /2  Mg (N=19) d 3/ Mg (N=21) f 7/2 Normal ground state configurations: I  =3/2 + I  =7/2 - pf sd Intruder ground state configurations: Mg (N=19) d 3/2 I  =1/ Mg (N=21) I  =3/2 - g-factor and spin of the 31,33 Mg ground state Outline - Physics case - - Island of Inversion - Perspectives Renewed  -decay studies 31 Mg F. Maréchal et al., PRC 72, (2005) 33 Mg V. Tripathi et al., PRL 101, (2008)

16 Coulomb excitation 31 Mg Outline - Physics case - - Island of Inversion - Perspectives

17 31 Mg Results Outline - Physics case - - Island of Inversion - Perspectives M. Seidlitz et al; PLB 700 (2011) 181 G. Neyens, Phys. Rev. C 84, (2011) M. Kimura, Phys. Rev. C 75, (R) (2007)

18 Outline - Physics case - - Island of Inversion - Perspectives Coulomb excitation of 30 Na, higher lying states? B(E2, 2 + → (4 + )) = 108 (33) e 2 fm 4 (preliminary!) theoretical predictions: B(E2, 2 + → 4 + ) = 90 e 2 fm 4 background subtracted, Doppler corrected for 30 Na 30 Na ((3 + ) → 2 + ) 30 Na ((4 + ) → (3 + )) 30 Na ((4 + ) → 2 + ) beam time: 80 hours beam intensity: 550 ions/sec more beam time Oct. 2012

19 Mg 32 Mg ??? 31 Mg E0 E2 inversion normal sd configurations intruder fp configurations Does picture of shape coexistence hold? d 3 /2 + f 7 /2  Outline - Physics case - - Island of Inversion - Perspectives

20 Shape coexistence in 30 Mg 30 Mg 32 Mg W. Schwerdtfeger, et al; PRL 103, (2009) Outline - Physics case - - Island of Inversion - Perspectives - electron spectroscopy after  -decay at ISOLDE - first excited 0 + state at 1789 keV in 30 Mg

21 The MINIBALL T-REX setup RIB large solid angle (58% of 4 π ) position sensitive PID (ΔE-E): p, d, t, α, … and e - from β-decay (!) V. Bildstein, K. Wimmer, Th. Kröll, R. Gernhäuser et al. (funded by TU München, KU Leuven, U Edinburgh, CSNSM Orsay, TU Darmstadt) T-REX: Si detector array for Transfer experiments at REX-ISOLDE Technical details: Barrel: 140 mm ΔE / 16 resistive strips 1000 mm E / pad Backward CD: 500 mm ΔE / DSSSD 500 mm E / pad Outline - Physics case - - Island of Inversion - Perspectives

22 t( 30 Mg, 32 Mg)p – two-neutron transfer 3 H loaded Ti foil (40  g/cm 2 3 H, 10 GBq) 30 2 MeV/u 4·10 4 part/s / 150 h beam on target Q 00 = -295(20) keV Two states populated: ground state and new state at 1083(33) keV Outline - Physics case - - Island of Inversion - Perspectives K. Wimmer et al; PRL 105, (2010)

23 Outline - Physics case - - Island of Inversion - Perspectives normal sd configurations intruder fp configurations K. Heyde, J.L. Wood, REV. OF MOD. PHYS., Vol 83, (2011) 1467 S. Grévy et al,; ARIS2011 proceedings Mg 32 Mg E0 E

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

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

26 Outline - Physics case - - Island of Inversion - Perspectives d( 66 Ni, 67 Ni)p – the 68 Ni region (N=40) E x =3600(250) keV E  =3619(30) keV E x [keV] E  [keV] shell closure at N=40? NNDC 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 HIE-ISOLDE Outline - Physics case - - Island of Inversion - Perspectives intensity upgrade energy upgrade MeV/u 3 MeV/u 3 MeV/u 5.5 MeV/u 10 MeV/u 8 MeV/u

28 Outline - Physics case - - Island of Inversion - Perspectives Transfer reactions at HIE-ISOLDE Higher energies at HIE-ISOLDE will be favorable for transfer reaction studies with heavy beams! Show case example: d( 132 Sn, 133 Sn)p FRESCO calc‘s by K. Wimmer (NSCL, MSU) Several HIE-ISOLDE LoIs based on MINIBALL & T-REX: - shell evolution - shape coexistence - pairing correlations  pair transfer - nuclear astrophysics: (d,p)  (n,  ) capture reactions Upgrade of T-REX -> flexible geometry of Si detectors Fusion veto detector Spectrometer to identify heavy transfer products

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

30 HIE-ISOLDE Outline - Physics case - - Island of Inversion - Perspectives ● 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 (GAmma Spectroscopy and PArticle Detection)  Neutron detectors  TSR storage ring ● Magnetic spectrometer or separator for channel selection Mark Huyse, IKS K.U. Leuven ISOLDE workshop 2010

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

32 RIB REX-ISOLDE Charge breeding: cooling and bunching of the RIB in the REXTRAP breeding to higher charge states in the EBIS to A/q<4.5 breeding time up to 400 ms A/q selection Possibility of in-trap decay during charge breeding: 61 Mn → 61 Fe J. Van de Walle et al., CERN-INTC (2009) Outline - Physics case - - Island of Inversion - Perspectives

33 6-fold segmented, encapsulated MINIBALL detector Collaboration: Köln, Heidelberg, München, Leuven

34 Outline - Physics case - - Island of Inversion - Perspectives Triple cluster detector 3 x core + 3 x 6 segments IKP Köln and CTT Preamplifier IKP Köln MPI-K Hd Digital high resolution spectroscopy electronics 40 MHz digitizer: DGF 4C Company XIA

35 Outline - Physics case - - Island of Inversion - Perspectives Pulse shape analysis and position sensitivity in-beam data: (line width after Doppler correction) Abs. Eff. 8 %, ΔΘ = 3.3 0

36 Deviations from classical shell model Outline - Physics case - - Island of Inversion - Perspectives

37 Transfer to ground state in 32 Mg g.s. occupation numbers using effective 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 to ground state in 32 Mg pure transfer to (f 7/2 ) 2 to small large contribution from (p 3/2 ) 2 needed (a > 0.7) SDPF-M underestimates the p 3/2 content in the wave functions Transfer to excited 0 + state in 32 Mg wave function similar to g.s. in 30 Mg two-neutron spectroscopic amplitudes for pure sd → sd transitions cross section underestimated, small (p 3/2 ) 2 amplitude (a ≈ 0.3) a Transfer to excited 0 + state in 32 Mg Outline - Physics case - - Island of Inversion - Perspectives K. Wimmer et al; PRL 105, (2010)

38 Shape coexistence in 30 Mg W. Schwerdtfeger, et al; PRL 103, (2009) Outline - Physics case - - Island of Inversion - Perspectives electric monopole (E0) transition to ground state:   (E0)= (26.2 (7.5)) x beyond-mean-field calculations with Gogny force: two competing configurations, small mixing largely different intrinsic quadrupole deformation ground state: 1d 3/2 neutrons first excited 0 + state: 1f 7/2 neutrons predictions for 32 Mg

39 Beam quality, monitoring, quantitative composition Laser ON Laser OFF Measured with ionization chamber (ΔE-E rest ) at the MINIBALL beam dump position Outline - Physics case - - Island of Inversion - Perspectives

40 Short term perspectives Outline - Physics case - - Island of Inversion - Perspectives 2011 campaign - Coulex experiments: 188;..,198 Pb, 140 Nd, 96 Kr, 220 Rn, 208 Rn, 128 Cd, 72 Kr, 30 Na, 98 Sr - transfer experiments - g-factor measurements Discussion of physics campaign during CERN shut down period MINIBALL workshop University of Cologne February or March March campaign 2013 CERN shut down

41 Outline - Physics case - - Island of Inversion - Perspectives t( 44 Ar, 46 Ar)p – probing N=28 Analysis by K. Nowak, TU München) Spokesperson: K. Wimmer Identified protons  -rays in coincidence with protons Transfer to gs of 46 Ar Weakening of N=28 closure below 48 Ca?  onset of deformation / shape coexistence? Search for the second 0 + state

42 O. Niedermeier, et al., Phys. Rev. Lett. 94, (2005) Neutron number Coulomb excitation of 30,32 Mg ‚Safe‘ energy Coulomb excitation at 2.25 MeV/u MINIBALL measures with small uncertainty B(E2) values from first excited 2 + states to ground state in 30,32 Mg Outline - Physics case - - Island of Inversion - Perspectives

43 E.K. Warburton, J. A. Becker and B. A. Brown, PRC 41 (1990) s 1/2 f 7/2 d 5/2 d 3/2 p 3/2 f 7/2 d 3/2 p 3/2 d 5/2 s 1/2 0p0h, spherical2p2h (intruder) Outline - Physics case - - Island of Inversion - Perspectives Mg E2 32 Mg E T. Motobayashi, et al.; PLB 346 (1995) 9 30,31,32 Mg, 30 Na

44 collective properties of 31 Mg F. Maréchal et al., Phys. Rev. C 72, (2005) M. Kimura, Phys. Rev. C 75, (R) (2007)  -decay studies of 31 Mg at GANIL - shell model calculation sd-fp valence space ANTOINE code, effective interaction SDPF-NR collective properties of positive K=1/2 rotational band of 31 Mg: excitation energy, quadrupole moment Q, B(E2), magnetic moment μ, B(M1) Outline - Physics case - - Island of Inversion - Perspectives

45 GOSIA Coulex calculation Results: - one step E2 excitation - decay of (5/2+,3/2+) level via M1 transition - results confirms strong collective excitation - rotational sequence: 1/2 + → 3/2 + → 5/2 + B(M1, 5/2 + → 3/2 + )=0.1 – 0.5 µ n 2 B(E2, 1/2 + → 5/2 + ) = 182 e 2 fm 4 Outline - Physics case - - Island of Inversion - Perspectives M. Seidlitz et al; PLB 700 (2011) 181 M. Kimura, Phys. Rev. C 75, (R) (2007)

46 Outline - Physics case - - Island of Inversion - Perspectives Collective properties of the Na-Isotopes B(E2, 2 + → (3 + )) = 147 (21) e 2 fm 4 (Ettenauer et al., Phys. Rev. C 78, , 2008) Y. Utsuno, et al., Phys. Rev. C70, , 2004 B(E2, 3/2 + → (5/2 + )) = 140 (25) e 2 fm 4 (Hurst et al., Phys. Lett. B 674, , 2009) theoretical predictions: B(E2, 3/2 + → 5/2 + ) = e 2 fm 4 B(E2, 3/2 + → 7/2 + ) = 57 e 2 fm 4 theoretical predictions: B(E2, 2 + → 3 + ) = 168 e 2 fm 4 B(E2, 2 + → 4 + ) = 90 e 2 fm 4 The „Island of Inversion“ (5/2 + ) ? (3+) ?

47 Outline - Physics case - - Island of Inversion - Perspectives Coulomb excitation of 30 Na, higher lying states? B(E2, 2 + → (4 + )) = 108 (33) e 2 fm 4 (preliminary!) theoretical predictions: B(E2, 2 + → 4 + ) = 90 e 2 fm 4 background subtracted, Doppler corrected for 30 Na 30 Na ((3 + ) → 2 + ) 30 Na ((4 + ) → (3 + )) 30 Na ((4 + ) → 2 + ) measuring time: 80 hours beam intensity: 550 ions/sec Follow up beam time Oct. 2012

48 GOSIA Coulex calculation Results: - one step E2 excitation - decay of (5/2+,3/2+) level via M1 transition - results confirms strong collective excitation - rotational sequence: 1/2 + → 3/2 + → 5/2 + B(M1, 5/2 + → 3/2 + )=0.1 – 0.5 µ n 2 B(E2, 1/2 + → 5/2 + ) = 182 e 2 fm 4 Outline - Physics case - - Island of Inversion - Perspectives M. Seidlitz et al; PLB 700 (2011) 181 M. Kimura, Phys. Rev. C 75, (R) (2007)

49 Shape coexistence in 30 Mg W. Schwerdtfeger, et al; PRL 103, (2009) Outline - Physics case - - Island of Inversion - Perspectives electric monopole (E0) transition to ground state:   (E0)= (26.2 (7.5)) x beyond-mean-field calculations with Gogny force: two competing configurations, small mixing largely different intrinsic quadrupole deformation ground state: 1d 3/2 neutrons first excited 0 + state: 1f 7/2 neutrons predictions for 32 Mg

50 Short term perspectives Outline - Physics case - - Island of Inversion - Perspectives 2011 campaign - Coulex experiments: 188;..,198 Pb, 140 Nd, 96 Kr, 220 Rn, 208 Rn, 128 Cd, 72 Kr, 30 Na, 98 Sr - transfer experiments - g-factor measurements Discussion of physics campaign during CERN shut down period MINIBALL workshop University of Cologne February or March March campaign 2013 CERN shut down


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