Masses of tripline nuclei Frank Herfurth, ISOLDE/CERN.

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Presentation transcript:

Masses of tripline nuclei Frank Herfurth, ISOLDE/CERN

Mass measurements Reaction A(a,b)B Q = M A + M a – M B – M b Alpha-decay A  B +  Q = M A – M B – M  Time of flight TOFI (LANL) SPEG/CSS2 (Ganil) SARA (ISN) ESR (GSI) Cyclotron frequency Penning traps MISTRAL (ISOLDE) Schottky noise analysis ESR (GSI) INDIRECT DIRECT (mass spectrometry)

ISOLTRAP G. Bollen et al., NIM A 368 (1996) 675 H. Raimbault-Hartmann, NIM B 126 (1997) 378 F. Herfurth et al., NIM A 469 (2001) 254 accumulation & bunching of ISOLDE 60 keV beam cooling isobar separation determination of cyclotron frequency 1m Bunches, 3keV energy 60keV ISOLDE- ion beam 1 c m 5 c m V B = 4.7 T B = 6 T Linear RFQ trap

Past Required Yield Half-life Relative mass accuracy y  T 1/2  m/m ms 1s 10s 1ms 10ms Future 32 Ar 74 Rb 34 Ar Present ISOLTRAP performance

ISOLTRAP measurements 74 Rb 32, 34 Ar 76 Sr 132 Sn Kr 74Rb 72Kr 76Sr 132Sn 216Bi 32, 34Ar Highlights: ISOLTRAP measurements

150 Ho and the dripline 150 Ho 150 Ho is an anchor point for long decay chains

Influence of ISOLTRAP data Dripline changed by the ISOLTRAP measurement of 150 Ho

rp-process above Z = 32

Mass model – experiment comparison H. Schatz et al. Phys. Rep. 294 (1998) 167 mass number A possible waiting point

Sr and Kr results possible waiting point

 - correlation – 32 Ar decay E.G. Adelberger et al., Phys. Rev. Lett. 83 (1999) 1299 Intrinsic shape of the proton-group a = +1 a = -1

32Ar – search for scalar currents present limit: a = ± (stat) ± (sys) but Q from IMME and:  a/  Q = -1.2·10 -3 keV Ar Mean TOF (  s) RF (Hz)  m/m ~ 1·10 -7, i.e.  m ~ 3 keV 371 ions, T obs = 100ms ISOLTRAP

Summary Direct and indirect techniques are needed to access dripline nuclei ISOLTRAP provides both very precise measurements to anchor long decay chains direct access to nuclei very close to the dripline

The ISOLTRAP collaboration Dietrich Beck Klaus Blaum Jürgen Kluge Daniel Rodríguez Christoph Scheidenberger Günther Sikler Christine Weber NSCL/MSU EastLansing Georg Bollen Stefan Schwarz GSI DarmstadtCERN Geneva Alban Kellerbauer Markku Oinonen Frank Herfurth Emanuel Sauvan LMU Munich Friedhelm Ames Michael Kuckein Sylvain Henry Jurek Szerypo McGill Univ. Montreal Robert B. Moore CSNSM Orsay Georges Audi David Lunney Univ. of Jyväskylä Veli Kolhinen and the ISOLDE collaboration