stopped beam measurement(H.J. Wollersheim)

RISING using stopped beams

RISING family (March 2006)	RISING stopped beam set-up	Walter Henning at the RISING stopped beam set-up

Experimental Setup

Proposal: S244(S210)
Proposals: S299, S300, S305, S312, S313, S316
"Decay studies of exotic nuclei using RISING and FRS"
Overview of the stopped beam experiments
Stopped beam design status
chart of isomers (Z=1 to Z=50)

beamtime schedule(December 2006)

Number of
detectors Angle to beam
direction Distance to a single
spot at the centre of
the stopper Efficiency at
1.3 MeV

5 51⁰ 209.8 mm +10 mm 5.7%

5 90⁰ 209.8 mm +20 mm 5.7%

5 129⁰ 209.8 mm +10 mm 5.7%

g-efficiency

18.2%

Status of Cluster detectors: Cable, Bias, Status
Status of Cluster detectors: FWHM
Status of Cluster detectors: Lineshape
Cluster energy resolution with DGF-electronics

Suggested set-up of RISING cluster detectors

Cluster labelling

experimental details:
- FRS beamline parameter
  SIS-FRS window: 0.04mg/cm² ¹²C
- S4 particle detectors (photo) MUSIC Cu-aperture
- S4 particle detectors (technical drawing)
  target position 120mm downstream compared to technical drawing
- N. Saito: Plastic scintillator for RISING experiments
- target position in stopped beam frame
- S4 Al-degrader: 0.45g/cm² - 7.20g/cm² for beam spot size of 50mm
- plastic density 1.17 g/cm³ Cu catcher: 80*80*2 mm³
  - ²³⁸U on Be(1.023g/cm²) ¹³⁰Sn
    implantation with S4 plastic degrader + Cu catcher
- VEGA Clover set-up (plastic catcher)
- Be (min. 98.5%) catcher for RISING:
  dimensions: 160*80*2mm, 160*80*3mm, 160*80*4mm
  (Heraeus 1205€, 1304€, 1370€ expected 7.3.2006)
- g-ray transmission (Pb 1mm) (Pb 2mm)
- T. Saito, N.Kurz: The RISING trigger

	Atomic Background Radiation:
	g-ray multiplicity <M>=6 Tc → 7mm plastic (log-scale) (lin-scale) g-ray multiplicity <M>=15 Pt → 7mm plastic g-ray multiplicity <M>=25 Pt → 2mm Cu

	Active Stopper:

Workshop: Physics workshop on the use of RISING with stopped beams Surrey, March 2004 (slide report)

Publications:
- The GSI projectile fragment separator (FRS): a versatile magnetic system for relativistic heavy ions
  H. Geissel et al. NIM B70, 286 (1992)
- Einfluss der Umladung beim Abbremsen von Schwerionen im Energiebereich (100-1000) MeV/u
  H. Weick, PhD thesis
- Rare ISotopes INvestigation at GSI (RISING) using gamma-ray spectroscopy at relativistic energies
  H.J. Wollersheim et al. NIM A537, 637 (2005)
- High-resolution detectors in nuclear spectroscopy
  J. Gerl Nucl. Instr. Meth. Phys. Res. A442, 238 (2000)
- Isomer spectroscopy of neutron rich ¹⁹⁰W
  Zs. Podolyák et al. Phys.Lett. 491B, 225 (2000)
- Nuclear structure of heavy neutron rich systems: Fragmentation spectroscopy with a 1 GeV per nucleon ²⁰⁸Pb beam
  M. Caamaño et al. Nucl.Phys. A682, 223c (2001)
- Isomeric Decay in ²⁰⁰Pt
  M. Caamaño et al. Acta Phys.Pol B32, 763 (2001)
- Population of High Spin States in Relativistic Fragmentation
  M.Pfützner et al. Acta Phys.Pol B32, 2507 (2001)
- A new ms isomer in ¹³⁶Sb produced in the projectile fission of ²³⁸U
  M.N. Mineva et al. Eur.Phys.J. A11, 9 (2001)
- Angular momentum population in the fragmentation of ²⁰⁸Pb at 1 GeV/nucleon
  M.Pfützner et al. Phys. Rev. C65, 064604(2002)
- Heavy nuclei studied in projectile fragmentation
  Zs. Podolyak et al. Nucl. Phys. A722, 273c (2003)
- Isomer spectroscopy in the neutron-deficient lead region following projectile fragmentation
  K.A. Gladnishki et al. Phys. Pol. B34, 2395 (2003)
- Angular momentum population in the projectile fragmentation of ²³⁸U at 750 MeV/nucleon
  K.A. Gladnishki et al. Phys. Rev. C69, 024617 (2004)
- Recent isomer spectroscopy experiments at the FRS
  M. Hellström (Surrey 2004)
- Isomeric decay studies with fragmentation beams
  Zs. Podolyak Acta Phys. Pol. B36, 1269 (2005)
- High angular momentum states populated in fragmentation reactions
  Zs. Podolyak et al. Phys. Lett. B632, 203 (2006)
  Posters:
- S.Pietri Stopped Beam Experiments (Feb. 2006)
- S.Pietri Stopped Beam Experiments (technical details 2006)
- K-isomers populated by projectile fragmentation in the neutron-rich A=180-200 mass region
  P. Mayet PhD-thesis
- A new ms isomer in ¹³⁶Sb produced in the projectile fission of ²³⁸U
  M.N. Mineva PhD-thesis
- P.Regan et al.:"Decay studies of exotic nuclei using RISING and FRS"(Proposals)

last update: 10.1.2006 Hans-Juergen Wollersheim HJW