Alexander Herlert

1
ISOLDE workshop 2007, February 12-14
High-precision mass measurements of exotic
nuclides The 2006 harvest of ISOLTRAP
Alexander Herlert for the ISOLTRAP Collaboration
CERN, PH-IS, Geneva
2
ISOLTRAP Experimental setup
determination of cyclotron frequency (R 107)
B 5.9 T
B 4.7 T
G. Bollen, et al., NIM A 368, 675 (1996) F.
Herfurth, et al., NIM A 469, 264 (2001)
3
Nuclides investigated 2003-2006
proton number
2003-2006 24 on-line runs 125 nuclides
investigated
neutron number
4
Isomer selection and spin assignment
K. Blaum et al., Europhys. Lett. 67, 586 (2004)
J. Van Roosbroeck et al., Phys. Rev. Lett. 92,
112501 (2004)
proton number
neutron number
5
Test of CKM unitarity
F. Herfurth et al., EPJA 15, 17 (2002) A.
Kellerbauer et al., PRL 93, 072502 (2004) M.
Mukherjee et al., PRL 93, 150801 (2004)
22Mg
proton number
neutron number
J.C. Hardy and I.S. Towner, Phys. Rev. C 71,
055501 (2005)
6
Nucleosynthesis and r-process
81Zn
proton number
neutron number
7
New ion detector
new detector
Number of pulse
C. Yazidjian et al. (Hyperfine Interact., in
print)
8
Comparison of efficiency
new detector
9
New temperature-stabilization system
Heater
Fan
/- 5mK
M. Marie-Jeanne et al.
10
ISOLTRAP mass measurements in 2006
Nuclides measured in 2006
61-63Fe
124,126Cd
56-63Mn
112,114,116,118,120,121Ag
38,39Ca
26,27Al
11
Mass excess comparison for Ag and Cd data
both runs stopped by power cuts
new on-line measurements planned in 2007
12
First on-line run with application of Ramsey
technique
masses for CKM-unitarity test (superallowed b
decay)
Tz 0
Tz -1
13
... and other investigations from Penning trap
spectrometers
CPT
Tz 0
62Ga
LEBIT
JYFLTRAP
46V
38Ca
Tz -1
42Sc
26Al
ISOLTRAP
14
Mass and half-life of 38Ca
Experiment IS437 Precision measurement of the
half-life and the ß-decay Q value of the
superallowed 0?0 ß decay of 38Ca

• fluorination of 38Ca at target and removal of
  daughter 38mK with REXTRAP
• half-life measurement with tape-station system
  mounted behind REXTRAP
• mass measurement (in parallel) with ISOLTRAP

simulation for 38Ca
talk by Bertram Blank on Wednesday
B. Blank et al.
15
Time-separated rf excitations (Ramsey scheme)
TOF / µs
Frequency detuning / Hz
two excitation periods
S. George et al. (to be published)
16
Preliminary result 38Ca
38Ca19F
preliminary
38Ca
S. George et al. (to be published)
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The case of 26,27Al
?
(evaluation in progress ...)
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Ion yields at ISOLDE
SC and PSB yields
courtesy M. Turrion
yield (ions/mC)
protons
neutrons
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Application of in-trap decay
Decay in the buffer-gas-filled preparation trap
produced at ISOLDE
4He
4He

e
4He
not produced at ISOLDE
4He
4He
20 cm
z (mm)
4He
4He
4He
4He
4He
Herlert et al., New J. Phys. 7, 44 (2005)
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First application of in-trap decay mass
spectrometry
61Fe
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Mass excess of neutron-rich Mn and Fe isotopes
further measurements required ...
preliminary
nuclides around N40
preliminary
PhD thesis C. Guénaut
22
Outlook - New ion source (graphite oven and gas
inlet)
installed end of 2006
new ion source
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Outlook - Hydrogen cooling for light nuclides
masses as input values for charge
radii measurements ...
F. Herfurth, 2001
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Not to forget
Thanks to my co-workers 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. Kellerbauer, H.-J. Kluge,
D. Lunney, M. Marie-Jeanne, M. Mukherjee, S.
Schwarz, R. Savreux, L. Schweikhard, C. Weber, C.
Yazidjian, ..., and the ISOLTRAP and ISOLDE
collaboration Thanks for the funding and
support BMBF, GSI, CERN, ISOLDE, EU networks
EUROTRAPS, EXOTRAPS, and NIPNET