Latest results from MINIBALL at REX‐ISOLDE
• Overview physics case• Last REX-ISOLDE campaign• Perspectives with HIE-ISOLDE
Peter ReiterIKP, University of Cologne
for the MINIBALL collaboration
3RD EGAN Workshop 24th – 27th June, 2013, University of Liverpool
Shell Model Physics with MINIBALL@REX-ISOLDE
transfer reactions at N=28 (Darmstadt, Munich)
46Ar
“Island of inversion” N=20Coulomb excitation &
transfer reactions (Darmstadt, Cologne,
Munich) 26,28,29,30Na
29,30,31,32Mg Towards the doubly magic 78Niwith 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
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
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)
Phys. Lett. B, 700 ( 2011) 181Phys. Rev. Lett. 105, 252501 (2010)Phys. Rev. Lett. 103, 012501 (2009)Phys. Rev. Lett. 94, 172501 (2005)
B(E2) measurements around 132Sn(Darmstadt, Munich)
122,123,124,128Cd 138,140,142,144Xe 140,142,148Ba
g-factors in Te isotopes(Darmstadt, Madrid)
132,134,136Te
Shell Model Physics with MINIBALL@REX-ISOLDETowards the doubly magic 100Sn
(Lund, CERN) 106,107,108,109,110Sn
107,108In100,102,104Cd
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
Phys. Rev. C 87, 017301 (2013)Phys. Rev. C 86, 031302(R) (2012)Eur. Phys. J. A (2012) 48: 105Eur. Phys. J. A 44 (2010) 355Phys. Rev. C 80, 054302 (2009)Phys. Rev. Lett. 101, 012502 (2008)Phys. Rev. Lett. 98, 172501 (2007)
Shapes & collectivity with MINIBALL@REX-ISOLDE
Shapes and collectivity between Kr and Sr
(York, Cologne, Munich, Orsay,Liverpool, Grenoble, Saclay)
72Kr 88,92,94,96Kr 93,95,97,99Rb
96Sr
Shapes and collectivity
in the rare earth region
(Darmstadt, Saclay, Oslo)
138,140Nd140,142Sm 142Gd 144Dy
Collectivity near Z=50(York, Darmstadt)
116,118Te
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
Nucl. Phys. A 899 (2013) 1Phys.Rev.Lett. 108, 062701 (2012)Phys.Rev.Lett. 98, 072501 (2007)
Octupole collectivityin heavy Rn, Ra isotopes
(Liverpool) 220,222Rn 222,224Ra
Shapes & collectivity with MINIBALL@REX-ISOLDE
Shapes in Hg, Pb, Po nuclei(Leuven, Liverpool, Jyväskylä) 182,184,186,188Hg 188,190,192,194,196,198Pb 196,198,200,202Po
Shapes and collectivityin light Po, Rn nuclei
(York, Jyväskylä)206Po
202,204Rn
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
Nature 497 (2013) 199
RIB Production:• 1,4 GeV protons• various targets• ionization• mass separation in
GPS/HRS• 800 RIBs available
New• Astatine beam
production and ionization spectroscopy
• S. Rothe et al.,Nat. Commun. 4:1835 doi: 10.1038/ncomms2819 (2013).
Outline - Physics case - MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives
Isomeric beams @ ISOLDE
6-
1+ (g.s.)
68Cu6- (g.s.)
1+
70Cu 3-
1+
6-
0
722
6-
1+
0
242
3-
101
• technique based on in-source laser spectroscopy (Fedosseev, V. N. et al. Rev. Sci. Instrum. 83, 02A903 (2012))• set the laser frequency to select and maximize the
production of the isomer of interest
g-Spectroscopy with Cu isomer beams: I. Stefanescu et al. PRL 98, 122701 (2007), E. Rapisarda et al. PRC 84, 064323 (2011)
Outline - Physics case - MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives
• new case 123Sn beam T. Kroell et al., experiment IS524
RIB preparation @ 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 - MINIBALL@REX-ISOLDE - 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
MINIBALLCoulomb 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)
Outline - Physics case - MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives
N. Warr, et al., Eur. Phys. J. A (2013) 49: 40
IS524 - Coulex of 123Cd
3/2+ 0
(1/2+) 116
11/2- 316
(5/2+) 463 (9/2-) 440(5/2+,7/2+) 591
(5/2+,7/2+) 409
(9/2+) 691
116
591
409
347
374
250
(123
)
xxx??
???)Cd(2)( 1222/11
h
H. Huck et al., PRC 40, 1384 (1989)
??)Cd(2)( 1222/3
d
Physics aim:
Enhanced quadrupole collectivity observed in 122,124Cd (IS411) S. Ilieva et a., to be published
Coupling of odd neutron to even core è reveals which orbitals contribute to collectivity
Additional finding from JYFLTRAP:Level scheme needs major revision as 11/2- isomer is not at 316 keV but 144(4) keVA. Kankainen et al., Phys. Rev. C 87, 024307
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
A.-L. Hartig, Th. Kröll, et al, TU Darmstadt
IS524 - Coulex of 123Cd
Energy [keV]
• First Coulex of odd Cd isotope at REX-ISOLDE
• Beam intensity: ≈ 9 ·104/s • Beam composition: - 100% Cd - RILIS beam - ratio g.s./isomer varied by RILIS setting (thanks to B. Marsh) - ≈ 66% 123mCd and ≈ 33% 123Cd
Observables:cross section (è B(E2)’s), g -ray angular distributions (è spin/parity), ...First results:• New transition observed: 463 keV, ...• Branchings and intensities are not consistent with level scheme in literature
Analysis by Anna-Lena Hartig (MSc project) [Th. Kröll, S. Ilieva, S. Bönig, M. Thürauf, M. Scheck]
PRELIMINARY
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
Oblate shape in 72Kr- a rarity that gives a deeper understanding of effective nucleon-nucleon interaction
Spokesperson: B.S. Nara Singh, IS478, proposed in 2007
Considerable efforts over 5 years – beam development and several attempts
72Kr at 200 MeV
~150 counts in 710 keV lineMay 2012
CD+PAD104Pd 2 mg/cm2
http://npg.york.ac.uk/structure_current.html B.S. Nara Singh, U of York for the IS478 collaboration
0+
2+
B(E2
)
Qs
4+
B(E2
)(0+)
B(E2)
Qs
Doppler correction projectile Doppler correction target
Mo
0294
11
Shape transition and coexistence in neutron-deficient rare earth nuclei:
Coulomb excitation of 140Sm
Prolate
Oblate
ground-state deformationGogny HFB
configuration mixing caclculationJ.-P. Delaroche et al.Phys. Rev. C 81, 014303 (2010)
ISOLDE IS495 (July 2012)beam 140Sm @ 2.85 A MeV RILIS 2105 pps @ Miniball
target 94Mo, 2 mg/cm2
A.Görgen et al. Univ. Oslo
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
M.Klintefjord, et al., Univ. Oslo
IS495: Differential cross sections – GOSIA analysis
7163 cm 8271 cm 9582 cm 11395 cm
preliminary
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
Mixed symmetry states in N=80 isotones Present situation & Predictions
Single 2+ MSS of 132Te, 134Xe, 136Ba
Fragmented 2+ MSS of 138Ce
QPM and SM reproduce situation in N=80
What is the predictive power?• QPM: single 2+ MSS of 140Nd• SM: fragmented 2+ MSS of 140Nd
Identify and quantitatively study MSSs of 140Nd and 142Sm
QPM, IBM
Shell model
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
C. Bauer, N. Pietralla, et al, TU Darmstadt
140Nd,142Sm – MINIBALL
140Nd
142Sm
142Sm
140Sm
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
140Nd result C. Bauer, et al., Phys. Rev. C in press
Results: new B(E2) valuesN=80 Isotone: 140Nd and 142Sm
p
50 50
1g7/2
2d5/2
2d3/2
3s1/2
1h11/2
82 82
comparison with • quasi-particle phonon calculations (N. Lo Iudice et al., PRC 77, 044310 (2008))• large-scale shell model calculations (D. Bianco et al., PRC 85, 034332 (2012))
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
(π1h9/2)2
Generalized seniority
Shape coexistence
T.E. Cocolios et al. PRL 106:052503 (2011)
N =
116
Change in nuclear structure in neutron deficient Po isotopes
Transition expected around 200Po
R. Julin et al JPG 27:R109 (2001)A.M. Oros et al NPA 645:107 (1999)
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
N. Kesteloot, et al., Univ. of Leuven
Laser spectroscopy at ISOLDE
Coulomb excitation 196,198,200,202Po
196Po
202Po200Po
198Po
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
666 keV2+0+ 200Po
677 keV2+0+ 202Po
605 keV2+0+ 198Po
871 keV2+0+ 94Mo
463 keV2+0+ 196Po
556 keV2+0+ 104Pd
N. Kesteloot, et al., Univ. of Leuven
224Ra (+120Sn) Coulomb excitation
L.P. Gaffney, P. A. Butler, M. Scheck, A. B. Hayes, F. Wenander, et al.,Nature 497, 199-204 (2013) doi:10.1038/nature12073
- Heaviest REX-ISOLDE beam
- B(E3, 0+ ↦ 3-)
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
‘For a NR system made up of point, charged particles which interact electro-statically with each other and with an arbitrary external field, the shielding is complete.’ L.I. Schiff, Phys. Rev. 132 (1963) 2194
Theoreticians search for loopholes in:• relativistic effects (electron)• finite-size effects of nucleus can break the symmetry (nucleus)• magnetic interactions (electron–nucleus)• non-EM exotica in electron-nucleon interaction
Atomic EDM moment
Nuclear pear-shapes can enhance the “Schiff moment” by ~ 3 orders of magnitude Search candidates are odd-A Rn (TRIUMF) and Ra (ANL, ISOLDE)
Permanent EDM violates both T & P symmetries
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
221Rn Results so far
201.0 ↓
223.5 ↓
289.3 ↓
Kβ1
↓
Kα1, Kα2
↓
221Rn, 6x103 ion/s30 hour beam time120Sn target, 2 mg/cm2
7/2+, 0 keV
223.5 keV
22.5 keV
Outline - Physics case - MINIBALL@REX-ISOLDE - Coulomb excitation - Perspectives
George O’Neill, et al., University of Liverpool
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
SPEDE - SPectrometer for Electron DEtection Si detector in backwards geometryAllows conversion electron spectroscopy – complete picture
The MINIBALL T-REX setup
RIB
• large solid angle (58% of 4π)• 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 / padBackward CD: 500 mm ΔE / DSSSD 500 mm E / pad
Outline - Physics case - MINIBALL@REX-ISOLDE - Perspectives
d(66Ni,67Ni)p – the 68Ni region (N=40)
J. Diriken, P. van Duppen, R. Raabe, et al.; IKS-KU Leuven for the IS469 collaboration
Outline - Physics case - MINIBALL@REX-ISOLDE - Transfer reaction - Perspectives
d(66Ni,67Ni)p – the 68Ni region (N=40)
• proton gated g-spectrum• g-transitions up to 5800 keV• p-g-g coincidence analysis• p-gprompt -gdelayed analysis
High resolution of MINIBALL allows to resolve states and to analyse angular distribution
J. Diriken, et al.; PRL submitted
Outline - Physics case - MINIBALL@REX-ISOLDE - Transfer reaction - Perspectives
d(66Ni,67Ni)p – the 68Ni region (N=40)
Partial level scheme,17 levels identified and characterized
J. Diriken, et al.; PRL submitted
Outline - Physics case - MINIBALL@REX-ISOLDE - Transfer reaction - Perspectives
g9/2
d5/2
d5/2
p1/2-1
S. Bottoni, S. Leoni, et al.; INFN -,Uni. Milano for the IS536 collaboration
HIE-ISOLDE
Outline - Physics case - MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives
• intensity upgrade• energy upgrade
2015
2016
1.2 MeV/u
3 MeV/u
5.5 MeV/u
10 MeV/u
8 MeV/u
Summary• REX-ISOLDE versatile accelerator
• MINIBALL physics case covers nuclei up to Radium
• First years: Shell model physics
• Recent developments: - Coulex with isomeric and heavy beams - transfer reactions & g-ray spectroscopy
• Major perspective: HIE-ISOLDE
Outline - Physics case - MINIBALL@REX-ISOLDE - Island of Inversion - Perspectives
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