latest results from miniball at rex‐isolde overview physics case last rex-isolde campaign...

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


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


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


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)


• 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


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)


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



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

http://npg.york.ac.uk/structure_current.html

http://npg.york.ac.uk/structure_current.html

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


M.Klintefjord, et al., Univ. Oslo

IS495: Differential cross sections – GOSIA analysis

7163 cm 8271 cm 9582 cm 11395 cm

preliminary


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


C. Bauer, N. Pietralla, et al, TU Darmstadt

140Nd,142Sm – MINIBALL

140Nd

142Sm

142Sm

140Sm


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))


(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)


N. Kesteloot, et al., Univ. of Leuven

Laser spectroscopy at ISOLDE

Coulomb excitation 196,198,200,202Po

196Po

202Po200Po

198Po


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-)


‘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


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


George O’Neill, et al., University of Liverpool


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


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


• 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



Partial level scheme,17 levels identified and characterized

J. Diriken, et al.; PRL submitted


g9/2

d5/2

d5/2

p1/2-1

S. Bottoni, S. Leoni, et al.; INFN -,Uni. Milano for the IS536 collaboration

HIE-ISOLDE


• 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


ll

ll

l

l

l

l

l

lll

lll

l

l l

l

l lll l

l

ll

l

ll

ll

ll

ll

l

ll

latest results from miniball at rex‐isolde overview physics case last rex-isolde campaign...

Documents

miniball collaboration

rexisoldetransfer reactions

teshell model physics

hieisolde peter reiterikp

ionization spectroscopy

university of liverpool

collectivityin light

ra shapes collectivity