1. CERN-ISCC Meeting “Storage Ring Facility at HIE-ISOLDE”
Klaus Blaum
3rd Nov 2011

2. Important steps: 1) Workshop at the Max-Planck-Institute for Nuclear Physics (34 participants) 2) Presentation of the LOI at the CERN INTC- Meeting (about 60 coauthors) 3) Presentation of the scientific (Yuri Litvinov) and technical Fredrik Wenander) part of the Project at the STORI 2011 conference 4) Meeting at MPIK in order to discuss the open questions related to the preparation of the TDR for the INTC meeting ( ) 5) TDR for the project almost ready for submission, which is planned for the February 2012 INTC Meeting (> 120 coauthors, about 20 institutions)

3. Presently 125 pages!

4. The heavy ion storage ring TSR at MPIK Heidelberg Circumference: 55m
TSR Max
Planck Institute
Heidelberg
Circumference: 55m
The heavy ion storage ring is shown on these transparency
The beam coming from the post accelerator is injected trough the beam line shown on the right side
The same straight section is also used or slow extraction
The left straight section is used for electron cooling.
The third one for experiment.
The last one for diagnostics and for RF system.
Multiturn injection is used to fill the storage ring with ions .
LOI Jan 2011
TDR in progress
(K. Blaum, Y. Litvinov)

5. 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: 21 MeV: 60 h
7 MeV: 16 s 73 MeV: 7470 s
202 MeV: 318 s
710 MeV: 23 s

6. Physics cases discussed in
the TDR
Half-life measurements of 7Be in different atomic charge states
Capture reactions for astrophysical p-process
Nuclear astrophysics through transfer reactions
Nuclear structure through transfer reactions
Long-lived isomeric states
Atomic effects on nuclear half-lives
Di-electronic recombination on exotic nuclei
Atomic physics experiments
Neutrino physics
(Laser spectroscopy experiments in the storage ring)

7. Two possible locations at ISOLDE for the ring
10m restriction
F/CH border F CH
Courtesy of Erwin Siesling

8. Jura (west) side
23.3m
24.6m
Building costs: ~ 3MCHF 8

9. Jura (west) side Proposed layout to fit the TSR at the west side:
23.3m
24.6m 3m
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 9

10. Surface & Weight 10 10 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
12m
Total surface available basement: 12mx24.6m=295m2
to 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) 10 10

11. Further information: Detailed estimation of the costs and manpower requirements 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 Financial support by the ISOLDE Collaboration is needed in order to realize this project.

12. Some speculations on the EC-decay of 7Be
A.V. Gruzinov, J.N. Bahcall, ApJ 490 (1997) 437
S. Kappertz et al., AIP Conf. Proc. Vol. 455 (1998) 110
Ionization of 7Be in the Sun can be ~ %
Negative magnetic moment of 7Be
7Be + e-  7Li + ne
7Be + p  8B + g
7Be is a key nuclide to calculate the high-energy neutrino flux from the Sun
would be the best place to perform these experiments!
Y. Litvinov, MPIK and GSI

13. Reaction Studies for Astrophysical Applications
ESR
Gas jet
Particle detectors
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
Proof-of-principle experiment:
96Ru (p,g)97Rh
Similar experiments possible at

14. Preliminary result @ 11 MeV – upper limit
Ignore (p,n) component –
resulting in an upper limit
for (p,)
σPG ~ 4.0 mb
Non-smoker: 3.5 mb
Similar experiments with radioactive beams feasable at HIE-ISOLDE + TSR.
HIE-ISOLDE energy range fits perfectly!

15. Transfer Reaction Studies: Physics cases
Transfer around the island of inversion
32Mg(d,p) T1/2 = 86 ms, 3103 pps
 not possible (half lives)
Transfer towards 78Ni
68Ni(d,p) T1/2 = 29 s, 5104 pps
Limit given by atomic charge exchange
Transfer around 100Sn
102Sn(p,d) T1/2 = 4.5 s, – 103 pps ??
Could be feasible! But probably not at 10 MeV/u
Transfer around 132Sn
134Sn(d,p) T1/2 = 1 s, 104 pps ?
R. Raabe, K.U. Leuven

16. Transfer Reaction Studies: Physics cases
Shape coexistence in n-poor Pb region
Still ISOLDE (Bi, Tl never post-accelerated so far)
Beam losses??
1E2
1E3
1E2
5E3
5E4
2E5
1E6
2E6
1E3
1E4
1E5
1E6
1E2
3E3
1E4
7E4
1E5
2E5
R. Raabe, K.U. Leuven

17. Nuclear Excitation by Electron Capture
an as-yet unobserved process
difficulty: NEEC
competes with much
stronger, but non-
resonant process of
radiative capture:
X-ray emitted,
instead of nuclear
excitation.
electrons nucleons
electrons nucleons
- nuclear analogue of dielectronic recombination
- inverse of electron conversion
[A. Palffy et al., Phys. Rev. Lett. 99 (2007) ]
Proposed candidate 93Mo
P. Walker, Surrey

18. Neutrino physics studies
Ideal test facility for the accumulation and storage of 6He