RITU MARA Summary

RITU AND MARA: A complementary couple

Cath Scholey

Department of PhysicsUniversity of Jyvskyl

Arctic FIDIPRO-EFES Workshop20th-24th April 2009

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 1 / 14

RITU MARA Summary

Layout

1 RITUIntroductionPhysics Programme @ RITUThe 100Sn Region

2 MARASeparator DesignCurrent StatusPhysics GoalsA≈100 Example

3 Summary

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 2 / 14

RITU MARA Summary

RITU - Recoil Ion Transport Unit (est. 1993)

Magnet configuration: QDQQ

He-gas filled ∼0.7mbarTransmission:Very symmetric ≈ 60 %,e.g 84Kr + 90ZrVery asymmetric ≈ 10 %,e.g 22Ne+238U

Efficient, very little massresolving power.

Ancillaries:At present: JuroGam II,GREAT and Köln plungerIn the future: JuroGam X,SAGE, LISA, JYFLplunger and GREAT

26 New isotopes: 210,211Th, 206−208Ac, 201−204Ra, 198,200Fr, 195,197Rn, 190−195At, 189Po, 176Tl,171,174Hg, 164Ir, 161Os,159Re, 157W.

>50 First excited states: Lightest 78Y, Heaviest 255Lr, most neutron deficient 180Pb.

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 3 / 14

RITU MARA Summary

RITUs Nuclear Landscape

Spectroscopy above 100Sn

Transitional Proton Dripline Nuclei

The Heavy ElementsShape Coexistance in the Pb region

SP States +Proton Decay above Pb

N-rich NucleiTransfer reactions

Mass 60-70N~Z, CEDin IAS Isomer studies

Mass 130-150X5 symmetries?

Octupole CollectivitySpectroscopy of Trans-U Nuclei

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 4 / 14

RITU MARA Summary

Enhanced Collectivity above Sn

JYFL studiesRecoil decaying taggingmeasurements - fast alphaor proton decay to selectthe γ-rays of interest.

54Fe(54Fe,2n)106Teσ ≈ 25 nbHadinia et al., PRC 72041303(R) (2005)58Fe(52Cr,3n)107TeHadinia et al., PRC 70064314 (2004)58Ni(54Fe,p2n)109Iσ ≈ 10µbPetri et al., PRC 76054301 (2007)58Ni(54Fe,2n)110Xeσ ≈ 50 nbSandzelius et al., PRL 99022501 (2007)

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 5 / 14

RITU MARA Summary

Life-time Measurements

Life-time measurements of 109I - 2 weeks last December - D.M. Cullen. VeryPreliminary results of states in 109Sb. Also produced 108,109Te 106,108Sn and hopefully109I.

band 2

μ

μ

μ

μ

ENERGY (keV)

CO

UN

TS / 0

.5ke

V

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 6 / 14

RITU MARA Summary

Life-time Measurements

Life-time measurements of 109I - 2 weeks last December - D.M. Cullen. VeryPreliminary results of states in 109Sb. Also produced 108,109Te 106,108Sn and hopefully109I.

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 6 / 14

RITU MARA Summary

Enhanced Collectivity above Sn - The next steps

In-beamExcited states in 108I - Scholey, Uusitalo

B(E2) Measurements of the 2+ and 4+ statesin 108,110,112Te - Cederwall and Wadsworth.

Using β-delayed α and proton emission as aselective tag for RDT.

Decay SpectroscopyAccepted proposal: Search 108Xe and theproton decay of 108I

Submitted proposal: Search for 113Ba.

In the near future 112Ba.

Total fusion cross sections

RITU MARA Summary

MARA- Mass Analysing Recoil Apparatus (est. 201X)

Juha Uusitalo – DesignerJan Sarén - Simulator

Point to point focus in Y point to || for deflector

Fixed energyfocus gives m/q

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 8 / 14

RITU MARA Summary

MARA- Mass Analysing Recoil Apparatus (est. 201X)

MARA Specifications - Mass resolving power 1/250Ion optical configuration Q1Q2Q3DEDMLength from target to the focal plane 6.7 m(reference particle)Angular acceptance 8 msr (±45 mrad in x

and ±55 mrad in y)Electric rigidity acceptance for approximately ± 15%central trajectory (depends on magnetic dipole chamber)Dispersion 8 mm/(% of m/q)Q1 effective length 250 mmQ1 aperture diameter 100 mmQ1 maximum field gradient 10.0 T/mQ2,3 effective length 350 mmQ2,3 aperture diameter 150 mmQ2,3 maximum field gradient 10.0 T/mElectric dipole pending angle and radius φ = 20◦ and ρ = 4.00 mElectric dipole gap 140 mmMagnetic dipole pending angle and radius φ = 40◦ and ρ = 1.00 mMagnetic dipole gap 100 mm

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 8 / 14

RITU MARA Summary

MARA - Current Status

3 quadrupoles, 2 power supplies, 1 magnetic dipole, simulations are in progress. One electrostatic deflectoris missing!

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 9 / 14

RITU MARA Summary

MARA - Current Status

RITU MARA

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 9 / 14

RITU MARA Summary

MARA - Physics Goals

Decay spectroscopy (proton and α-particle decay) around 100Sn.112Ba→108Xe→104Te→100SnProton drip-line spectroscopyCompetition between proton and γ-rays.new proton emitters

rp-processmasses half-lives and isomers in N=Z nuclei determine the rp- processsynthesis rate.

Proton-neutron pairing interaction with T = 0 and T = 1Mirror nuclei

Effects of increasing Coulomb field -CED in IASStudy of isospin symmetry breakingProton skins (N < Z nuclei)

Super-deformation and hyper-deformation (N≈Z ≈40)In reality, the users decide and ideas are welcome, as is funding!

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 10 / 14

RITU MARA Summary

Focal plane

Focal plane detector system: slit system 10cm up-stream and down-stream of thefocal plane. At the focal plane - MWPC (1 mm granularity), 40cm down-streamDSSDs

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 11 / 14

RITU MARA Summary

108Xe - a worked exampleCross-sections (PACE4)

EVAPORATION - Compound nucleus 112Xe; Mode 1Excitation energy 59.2 MeV

Compound nucleus formation cross section: 6.44e+02 mb

L I S E ++ [Noname]18-04-2009 13:25:24

49.5 50.5 51.5 52.5 53.5 54.5 55.5 56.5 57.5 58.5Neutrons (N)

45

47

49

51

53

55

Pro

ton

s (Z

)

5e-031e-022e-023e-026e-021e-012e-014e-018e-011e+003e+005e+009e+002e+013e+016e+011e+02

54Fe(58Ni,4n)108Xe @240MeV target thickness 0.5µg/cm2 beam energy calculated by Korgul et al, PRC 77 034301 (2008)

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 12 / 14

RITU MARA Summary

108Xe - a worked example

Still to doTOF flight Hopefully gives backreduction of 2

Spherical Aperture before the 1st

QuadrupoleCut 108Xe by 7%, but others by 30%,purely recoil cone dependent.

Charged particle detection @ targetposition.

Include horizontal angle correctionwith position sensitive detectors.

half-lives of exotic nuclei are usuallyon our side. Factor of 106.

REMEMBER we can run slower andlonger as more beamtime is availablethanks to the new cyclotron.

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 12 / 14

RITU MARA Summary

Summary

RITU - Is a very efficient and versatile separator.

Produced new isotopes from W to Th (hope to produce more, bothheavier and lighter)

Excited states ranging from Y to Lr

MARA - will be a very selective device

Complement and continue to the successes of RITU and with MARA

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 13 / 14

RITU MARA Summary

Thanks

Thanks to the RITU-γ team.

Thanks to all those who have performed experiments at JYFL and thosewho are planning to.

Thanks to Juha Uusitalo and Jan Sarén for their work on MARA.

Thanks to you for listening.

Cath Scholey (JYFL, Finland) RITU AND MARA: A complementary couple April 21st , 2009 14 / 14

RITUIntroductionPhysics Programme @ RITU The 100Sn Region

MARASeparator DesignCurrent StatusPhysics GoalsA100 Example

Summary