CERN-ISCC Meeting

“Storage Ring Facility atHIE-ISOLDE”

Klaus Blaum

3rd Nov 2011

Important steps:

1) TSR@ISOLDE Workshop at the Max-Planck-Institute for Nuclear Physics 28.-29.10.2010 (34 participants)

2) Presentation of the TSR@ISOLDE LOI at the CERN INTC- Meeting 02.02.2011 (about 60 coauthors)

3) Presentation of the scientific (Yuri Litvinov) and technical Fredrik Wenander) part of the TSR@ISOLDE Project at the STORI 2011 conference

4) TSR@ISOLDE Meeting at MPIK in order to discuss the open questions related to the preparation of the TDR for the INTC meeting (28.10.2011)

5) TDR for the TSR@ISOLDE project almost ready for submission, which is planned for the February 2012 INTC Meeting (> 120 coauthors, about 20 institutions)

Presently 125 pages!

The heavy ion storage ring TSRat MPIK Heidelberg

Cir

cum

fere

nce

: 55

m

TSR Max Planck Institute Heidelberg

TSR@HIE-ISOLDELOI Jan 2011 TDR in progress(K. Blaum, Y. Litvinov)

Some technical details:

• Typical storage energy for 12C6+: E = 72 MeV 6 MeV/u• Vacuum: ~10-11 mbar• Acceptance ellipse of the TSR: 120 mm mrad well suited for REX-ISOLDE• Multiturn injection mA of stored beam possible• Electron cooler transverse cooling time of ~1s• RF acceleration and deceleration possible• Typical storage times:

p @ 21 MeV: 60 h9Be1+ @ 7 MeV: 16 s12C6+ @ 73 MeV: 7470 s35Cl17+ @ 202 MeV: 318 s 197Au51+ @ 710 MeV: 23 s

1. Half-life measurements of 7Be in different

atomic charge states

2. Capture reactions for astrophysical p-process

3. Nuclear astrophysics through transfer reactions

4. Nuclear structure through transfer reactions

5. Long-lived isomeric states

6. Atomic effects on nuclear half-lives

7. Di-electronic recombination on exotic nuclei

8. Atomic physics experiments

9. Neutrino physics

10. (Laser spectroscopy experiments in the storage ring)

Physics cases discussed in

the TSR@ISOLDE TDR

Two possible locations at ISOLDE for the ring

10m restriction

F/CH borderF

CH

Courtesy of Erwin Siesling

8

Jura (west) side

24.6m23.3m

Building costs: ~ 3MCHF

9

Jura (west) side

Proposed layout to fit the TSR at the west side:- Installation above the CERN infrastructure-tunnel (not negotiable to move the tunnel: houses essential CERN signals and infrastructure) - Tilted beamline coming up from the machine

24.6m23.3m

3m

10

Surface & Weight

12m

Total surface available basement: 12mx24.6m=295m2to house power-supplies and additional racks (total 29m length floor space for the TSR equipment and 7m for the e-target equipment + 10 standard 19’’ racks and ECOOL HV cage 4x4m2)

Total surface TSR floor: 24.6x23.3m=573m2 of which 20x20m (400m2) reserved for the ring (final position of the ring within the building to be defined)TSR floor approx . 3m above Hie Linac floor

Level of the center of beam at 1.77m above TSR floor

Further information:

Detailed estimation of the costs and manpowerrequirements are in preparation. preliminary values by MPIK exist; information from CERN needed

Funding requests to the different agencies are under discussion (e.g. UK)

Ideal time schedule: Building ready end of 2013,move of the ring in 2014, commissioning and start in 2015.

Financial support by the ISOLDE Collaboration is needed in order to realize this project.

Some speculations on the EC-decay of 7Be

A.V. Gruzinov, J.N. Bahcall, ApJ 490 (1997) 437

Ionization of 7Be in the Sun can be ~ 20-30 %

S. Kappertz et al., AIP Conf. Proc. Vol. 455 (1998) 110

Negative magnetic moment of 7Be

TSR@ISOLDE would be the best place to perform these experiments!

Y. Litvinov, MPIK and GSI

7Be + e- 7Li + e7Be + p 8B +

René Reifarth (U. Frankfurt/GSI)

Reaction Studies for Astrophysical Applications

Measurements of (p,) or (α,) rates in the Gamow window of the p-process in inverse kinematics.

Advantages:

• Applicable to radioactive nuclei• Detection of ions via in-ring particle

detectors (low background, high efficiency)

• Knowledge of line intensities of product nucleus not necessary

• Applicable to gases

ESR

Gas jet

Particle detectors

Similar experiments possible at TSR@ISOLDE!

Proof-of-principle experiment:

96Ru (p,)97Rh

René Reifarth (U. Frankfurt/GSI)

Preliminary result @ 11 MeV – upper limit

σPG ~ 4.0 mb

Ignore (p,n) component – resulting in an upper limit

for (p,)

Non-smoker: 3.5 mb

HIE-ISOLDE energy range fits perfectly!

Similar experiments with radioactive beams feasable at HIE-ISOLDE + TSR.

Transfer Reaction Studies: Physics casesTransfer around the island of inversion

32Mg(d,p) T1/2 = 86 ms, 3103 pps not possible (half lives)

Transfer towards 78Ni68Ni(d,p) T1/2 = 29 s, 5104 ppsLimit given by atomic charge exchange

R. Raabe, K.U. Leuven

Transfer around 100Sn102Sn(p,d) T1/2 = 4.5 s, 102 – 103 pps ??

Could be feasible! But probably notat 10 MeV/u

Transfer around 132Sn134Sn(d,p) T1/2 = 1 s, 104 pps ?

5E3 5E4 2E51E2 1E6

3E3 1E4 7E4

2E6

1E2

1E3

Shape coexistence in n-poor Pb regionStill unique @ ISOLDE(Bi, Tl never post-accelerated so far)

Beam losses??

1E6

1E5

1E4

1E3

1E2 2E51E5

Transfer Reaction Studies: Physics cases

R. Raabe, K.U. Leuven

Nuclear Excitation by Electron Capture

[A. Palffy et al., Phys. Rev. Lett. 99 (2007) 172502]

an as-yet unobserved process

difficulty: NEECcompetes with muchstronger, but non-resonant process ofradiative capture:X-ray emitted,instead of nuclearexcitation.

electrons nucleons electrons nucleons

- nuclear analogue of dielectronic recombination- inverse of electron conversion

P. Walker, SurreyProposed candidate 93Mo

Neutrino physics studies

• Ideal test facility for the accumulation and storage of 6He