Welcome to the ISOLTRAP database. The database allows you to search for the data (frequency ratio) of isotopes and also shows the paper in which the data was published. The data is not complete. Especially the most recent data, which are not yet published are not entered. There are two ways of querying data from the database: You can either click on the nuclear chart above and thus select a region of interest or you can enter the isotope(s) of interest in the fields below.

Search for data on the isotope - (e.g. Cs-132)

It is possible to use wildcards in your search: Use ? for one letter/number and * for any number of letters/numbers. Example: (A search for Cs-13? will return the data on all isotopes from Cs-130 to Cs-139.) Leaving a field empty sets its value to *. Thus, simply clicking "Search!" will result in a complete list of measured isotopes. 

There are 3 basic ways to search the database:

1. Isotope search: Enter an element and leave the mass number empty.
2. Isobar search: Enter only a mass number and leave the element empty.
3. Nuclide search: Enter both element and mass number to return data on one specific nuclide.

ISOLTRAP papers:

Click on a paper to see the isotope data published within.

• F. Herfurth et al.: New mass data for the rp-process above Z = 32.
  Eur. Phys. J. A 47 (2011), 75
• M. Breitenfeldt et al.: Approaching the N = 82 shell closure with mass measurements of Ag and Cd isotopes.
  Phys. Rev. C 81 (2010), 034313
• S. Eliseev et al.: Direct mass measurements of 194Hg and 194Au: A new route to the neutrino mass determination?.
  Phys. Lett. B 693 (2010), 426-429
• S. Naimi et al.: Critical-Point Boundary for the Nuclear Quantum Phase Transition Near A=100 from Mass Measurements of 96,97Kr.
  Phys. Rev. Lett. 105 (2010), 032502
• D. Neidherr et al.: Discovery of 229Rn and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements.
  Phys. Rev. Lett. 102 (2009), 112501
• D. Neidherr et al.: High-precision Penning-trap mass measurements of heavy xenon isotopes for nuclear structure studies.
  Phys. Rev. C 80 (2009), 044323
• D. Neidherr, et al.: High-precision Penning-trap mass measurements of heavy xenon isotopes for nuclear structure studies.
  Phys. Rev. C 80 (2009), 044323
• M. Breitenfeldt et al.: Penning trap mass measurements of 99-109Cd with the ISOLTRAP mass spectrometer, and implications for the rp process.
  Phys. Rev. C 80 (2009), 035805
• M. Kowalska et al.: Preparing a journey to the east of 208Pb with ISOLTRAP: Isobaric purification at A = 209 and new masses for 211-213Fr and 211Ra.
  Eur. Phys. J. A 42 (2009), 351-359
• C. Weber et al.: Atomic mass measurements of short-lived nuclides around doubly-magic 208Pb.
  Nucl. Phys. A 803 (2008), 1-29
• M. Dworschak et al.: Restoration of the N=82 Shell Gap from Direct Mass Measurements of 132,134Sn.
  Phys. Rev. Lett. 100 (2008), 072501
• M. Mukherjee et al.: Mass measurements and evaluation around A = 22.
  Eur. Phys. J. A 35 (2008), 31-37
• S. Baruah et al.: Mass Measurements beyond the Major r-Process Waiting Point 80Zn.
  Phys. Rev. Lett. 101 (2008), 262501
• S. George et al.: Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides.
  Europhys. Lett. 82 (2008), 50005
• W. Geithner et al.: Masses and Charge Radii of 17-22Ne and the Two-Proton-Halo Candidate 17Ne.
  Phys. Rev. Lett. 101 (2008), 252502
• C. Guénaut et al.: High precision mass measurements of nickel , cooper and gallium isotopes and the purported shell closure at N=40.
  Phys. Rev. C 75 (2007), 044303
• C. Yazidjian et al.: Evidence for a breakdown of the isobaric multiplet mass equation: A study of the A = 35,T = 3/2 isospin quartet.
  Phys. Rev. C 76 (2007), 024308
• S. George et al.: Ramsey Method of Separated Oscillatory Fields for High-Precision Penning Trap Mass Spectrometry.
  Phys. Rev. Lett. 98 (2007), 162501
• A. Herlert et al.: Towards high-accuracy mass spectrometry of highly charged short-lived ions at ISOLTRAP.
  Int. J. mass Spectrom. 251 (2006), 131-137
• D. Rodríguez et al.: Accurate mass measurements on neutron-deficient krypton isotopes.
  Nucl. Phys. A 769 (2006), 1-15
• P. Delahaye et al.: High-accuracy mass measurements of neutron-rich Kr isotopes.
  Phys. Rev. C 74 (2006), 034331
• C. Guénaut et al.: Mass measurements of 56-57Cr and the question of shell reincarnation at N = 32.
  J. Phys. G 31 (2005), S1765-S1770
• C. Weber et al.: Weighing excited nuclear states with a Penning trap mass spectrometer.
  Phys. Lett. A 347 (2005), 81-87
• F. Herfurth et al.: Recent high-precision mass measurements with the Penning trap spectrometer ISOLTRAP.
  Eur. Phys. J. A 25 (2005), 17-21
• G. Sikler et al.: Mass measurements on neutron-deficient Sr and neutron-rich Sn isotopes with the ISOLTRAP mass spectrometer.
  Nucl. Phys. A 763 (2005), 45-58
• D. Rodríguez et al.: Mass Measurement on the rp-Process Waiting Point 72Kr.
  Phys. Rev. Lett. 93 (2004), 161104
• F. Herfurth et al.: Masses along the rp-process path and large scale surveys on Cu, Ni and Ga with ISOLTRAP.
  Nucl. Phys. A 746 (2004), 487-492
• J. Dilling et al.: Direct mass measurements of neutron-deficient xenon isotopes using the ISOLTRAP mass spectrometer.
  Eur. Phys. J. A 22 (2004), 163-171
• J. Van Roosbroeck et al.: Unambiguous Identification of Three beta-Decaying Isomers in Cu70.
  Phys. Rev. Lett. 92 (2004), 112501
• K. Blaum et al.: Recent results from the Penning trap mass spectrometer ISOLTRAP.
  Nucl. Phys. A 746 (2004), 305-310
• K. Blaum et al.: Population inversion of nuclear states by a Penning trap mass spectrometer.
  Europhys. Lett. 67 (2004), 586-592
• M. Mukherjee et al.: The Mass of 22Mg.
  Phys. Rev. Lett. 93 (2004), 150801
• K. Blaum et al.: Masses of Ar32 and Ar33 for Fundamental Tests.
  Phys. Rev. Lett. 91 (2003), 260801
• F. Herfurth et al.: Accurate mass measurements of very short-lived nuclei.
  Eur. Phys. J. A 15 (2002), 17-20
• H. Raimbault-Hartmann et al.: High-accuracy mass determination of neutron-rich rubidium and strontium isotopes.
  Nucl. Phys. A 706 (2002), 3-14
• F. Herfurth et al.: Breakdown of the Isobaric Multiplet Mass Equation at A=33, T=3/2.
  Phys. Rev. Lett. 87 (2001), 142501
• G. Bollen et al.: Mass Measurements on Short-Lived Nuclides with ISOLTRAP.
  Hyperfine Interactions 132 (2001), 215-222
• S. Schwarz et al.: Accurate masses of neutron-deficient nuclides close to Z=82.
  Nucl. Phys. A 693 (2001), 533-545
• D. Beck et al.: Accurate masses of unstable rare earth isotopes by ISOLTRAP.
  Eur. Phys. J. A 8 (2000), 307-329
• F. Ames et al.: High-accuracy mass determination of unstable cesium and barium isotopes.
  Nucl. Phys. A 651 (1999), 3-30
• D. Beck et al.: Direct mass measurements of unstable rare earth isotopes with the ISOLTRAP mass spectrometer.
  Nucl. Phys. A 626 (1997), 343-352
• T. Otto et al.: Penning-trap mass measurements of neutron-deficient Rb and Sr isotopes.
  Nucl. Phys. A 567 (1994), 281-302
• G. Bollen et al.: Mass determination of francium and radium isotopes by a penning trap mass spectrometer.
  J. Mod. Optics 39 (1992), 257-262
• H. Stolzenberg et al.: Accurate mass determination of short-lived isotopes by a tandem Penning-trap mass spectrometer.
  Phys. Rev. Lett. 65 (1990), 3104-3107