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INTC meeting, February 20, 2006. Status report IS413: High-precision mass measurements of exotic nuclei with the triple-trap mass spectrometer ISOLTRAP. Frank Herfurth GSI, Darmstadt, Germany for the ISOLTRAP Collaboration. Experiments and results 2005 Technical developments Proposal 2006.

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Presentation Transcript
slide1

INTC meeting, February 20, 2006

Status report IS413:

High-precision mass measurements of exotic nuclei

with the triple-trap mass spectrometer ISOLTRAP

Frank Herfurth

GSI, Darmstadt, Germany

for the ISOLTRAP Collaboration

  • Experiments and results 2005
  • Technical developments
  • Proposal 2006
slide2

The Team

ISOLTRAP collaboration:

G. Audi, S. Baruah, D. Beck, K. Blaum, G. Bollen, M. Breitenfeldt, P. Delahaye,

M. Dworschak, S. George, C. Guénaut, U. Hager, F. Herfurth, A. Herlert,

A. Kellerbauer, H.-J. Kluge, D. Lunney, M. Marie-Jeanne, M. Mukherjee,

S. Schwarz, L. Schweikhard, C. Weber, C. Yazidjian, ... ,

Funding and support:

BMBF, GSI, CERN, ISOLDE,

EU networks EUROTRAPS, EXOTRAPS, NIPNET, EURONS

slide3

ISOLTRAP runs in 2005

ISOLTRAP program 2005

total number of shifts: 30

slide4

ISOLTRAP mass measurements in 2005

Nuclides measured

in 2005

126Xe, 136Xe

first doubly

charged ions

127,128,131-134Sn

118,120,122-124Cd

71-81Zn

measured after report 2004

17Ne, 19Ne

slide6

ISOLTRAP mass measurements in 2005

Two neutron separation energy for the zinc isotopes

AME2003

ISOLTRAP

Zn

preliminary

slide7

10

8

6

4

2

0

0

20

40

60

80

Technical Developments

new detector

Number of Ions per Pulse

CEM

MCP

Time / ms

slide8

Technical Developments

temperature

sensor

Heater

  • Temperature & pressure stabilization
  • New test ion source

Fan

  • All elements
  • Mass selective
slide11

Proposed ISOLTRAP mass measurement program 2006

3

Need hydrogen as buffer gas, preparation required

slide12

Proposed ISOLTRAP mass measurement program 2006

Clean gas inlet for N2

Good HRS setting

to remove CO contaminant

slide13

Proposed ISOLTRAP mass measurement program 2006

Also possible as off-line

run with existing target,

high statistics needed

slide14

Proposed ISOLTRAP mass measurement program 2006

Additionally, in-trap decay provides access to mass measurements on Fe isotopes

slide15

Proposed ISOLTRAP mass measurement program 2006

For UC target with quartz

transfer line clean conditions expected

(as for Zn)

slide16

Proposed ISOLTRAP mass measurement program 2006

Fr and Ra highly contaminate the beam, no solution found so far.

slide17

Summary

Successful measurements using 30 shifts in 5 runs (+2 incomplete) in 2005

A number of technical improvements increase stability and efficiency

27 shifts in 5 runs of radioactive beam requested for 2006

+ 3 shifts to test the access to He isotopes