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Title: Mass Measurements at SHIPTRAP

Abstract

The Penning trap facility SHIPTRAP at GSI Darmstadt was set up to perform high-precision experiments on heavy elements produced in fusion-evaporation reactions at SHIP. Up to now the masses of 52 radionuclides have been measured, 17 for the first time. In particular, the area of the rp-process endpoint, close to 100Sn, was addressed. The relative mass uncertainties were between 10-7 and 5-10-8. Nuclides with half-lives as short as 580 ms and calculated production cross sections as low as 20 {mu}b have been measured. The main limitation for measurements of transuranium radionuclides is their low cross section. After improving the present efficiency of SHIPTRAP, elements with production cross sections down to 1 {mu}b will be accessible.

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]; ; ;  [2]; ;  [1];  [3]; ; more »;  [4] « less
  1. Gesellschaft fuer Schwerionenforschung mbH, 64291 Darmstadt (Germany)
  2. Institut fuer Physik, Ernst-Moritz-Arndt-Universtitaet, 17489 Greifswald (Germany)
  3. (Russian Federation)
  4. Department fuer Physik der Ludwig-Maximilians-Universitaet Muenchen, Am Coulombwall 1, 85748 Garching (Germany) (and others)
Publication Date:
OSTI Identifier:
21056741
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 891; Journal Issue: 1; Conference: 6. Symposium on nuclear physics, Tours (France), 5-8 Sep 2006; Other Information: DOI: 10.1063/1.2713496; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCURACY; CROSS SECTIONS; EFFICIENCY; EVAPORATION MODEL; HALF-LIFE; HEAVY ION FUSION REACTIONS; HEAVY NUCLEI; MASS SPECTROSCOPY; NUCLEAR REACTION YIELD; TIN 100; TRANSACTINIDE ELEMENTS; TRAPS

Citation Formats

Martin, A., Ackermann, D., Block, M., Di, Z., Herfurth, F., Hessberger, F., Hofmann, S., Kluge, H.-J., Mazzocco, M., Mukherjee, M., Rahaman, S., Rauth, C., Chaudhuri, A., Marx, G., Schweikhard, L., Eliseev, S., Vorobjev, G., St. Petersburg Nuclear Physics Institute, Gatchina 188300, Habs, D., Neumayr, J. B., and Thirolf, P. G. Mass Measurements at SHIPTRAP. United States: N. p., 2007. Web. doi:10.1063/1.2713496.
Martin, A., Ackermann, D., Block, M., Di, Z., Herfurth, F., Hessberger, F., Hofmann, S., Kluge, H.-J., Mazzocco, M., Mukherjee, M., Rahaman, S., Rauth, C., Chaudhuri, A., Marx, G., Schweikhard, L., Eliseev, S., Vorobjev, G., St. Petersburg Nuclear Physics Institute, Gatchina 188300, Habs, D., Neumayr, J. B., & Thirolf, P. G. Mass Measurements at SHIPTRAP. United States. doi:10.1063/1.2713496.
Martin, A., Ackermann, D., Block, M., Di, Z., Herfurth, F., Hessberger, F., Hofmann, S., Kluge, H.-J., Mazzocco, M., Mukherjee, M., Rahaman, S., Rauth, C., Chaudhuri, A., Marx, G., Schweikhard, L., Eliseev, S., Vorobjev, G., St. Petersburg Nuclear Physics Institute, Gatchina 188300, Habs, D., Neumayr, J. B., and Thirolf, P. G. Mon . "Mass Measurements at SHIPTRAP". United States. doi:10.1063/1.2713496.
@article{osti_21056741,
title = {Mass Measurements at SHIPTRAP},
author = {Martin, A. and Ackermann, D. and Block, M. and Di, Z. and Herfurth, F. and Hessberger, F. and Hofmann, S. and Kluge, H.-J. and Mazzocco, M. and Mukherjee, M. and Rahaman, S. and Rauth, C. and Chaudhuri, A. and Marx, G. and Schweikhard, L. and Eliseev, S. and Vorobjev, G. and St. Petersburg Nuclear Physics Institute, Gatchina 188300 and Habs, D. and Neumayr, J. B. and Thirolf, P. G.},
abstractNote = {The Penning trap facility SHIPTRAP at GSI Darmstadt was set up to perform high-precision experiments on heavy elements produced in fusion-evaporation reactions at SHIP. Up to now the masses of 52 radionuclides have been measured, 17 for the first time. In particular, the area of the rp-process endpoint, close to 100Sn, was addressed. The relative mass uncertainties were between 10-7 and 5-10-8. Nuclides with half-lives as short as 580 ms and calculated production cross sections as low as 20 {mu}b have been measured. The main limitation for measurements of transuranium radionuclides is their low cross section. After improving the present efficiency of SHIPTRAP, elements with production cross sections down to 1 {mu}b will be accessible.},
doi = {10.1063/1.2713496},
journal = {AIP Conference Proceedings},
number = 1,
volume = 891,
place = {United States},
year = {Mon Feb 26 00:00:00 EST 2007},
month = {Mon Feb 26 00:00:00 EST 2007}
}
  • The SHIPTRAP Penning trap mass spectrometer has been designed and constructed to measure the mass of short-lived, radioactive nuclei. The radioactive nuclei are produced in fusion-evaporation reactions and separated in flight with the velocity filter SHIP at GSI in Darmstadt. They are captured in a gas cell and transfered to a double Penning trap mass spectrometer. There, the cyclotron frequencies of the radioactive ions are determined and yield mass values with uncertainties {>=}4.5{center_dot}10{sup -8}. More than 50 nuclei have been investigated so far with the present overall efficiency of about 0.5 to 2%.
  • The Penning trap mass spectrometer SHIPTRAP is installed behind the velocity-filter SHIP at GSI for high-precision mass measurements of fusion-evaporation residues. To facilitate an efficient stopping of the reaction products a buffer gas stopping cell is utilized. In an investigation of neutron-deficient nuclides in the terbium-to-thulium region around A {approx_equal} 146, 18 new or improved mass values have been obtained, resulting in a more accurate determination of the proton drip line for holmium and thulium. With the present performance of SHIPTRAP, a first direct mass measurement of transuranium elements in the nobelium region is within reach.
  • The masses of very neutron-deficient nuclides close to the astrophysical r p- and {nu} p-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyvaeskylae and SHIPTRAP at GSI/Darmstadt. Isotopes from yttrium (Z=39) to palladium (Z=46) have been produced in heavy-ion fusion-evaporation reactions. In total, 21 nuclides were studied, and almost half of the mass values were experimentally determined for the first time: {sup 88}Tc, {sup 90-92}Ru, {sup 92-94}Rh, and {sup 94,95}Pd. For the {sup 95}Pd{sup m}, (21/2{sup +}) high-spin state, a first direct mass determination was performed. Relative mass uncertainties of typically {delta}m/m=5x10{sup -8} were obtained. Themore » impact of the new mass values has been studied in {nu} p-process nucleosynthesis calculations. The resulting reaction flow and the final abundances are compared with those obtained with the data of the Atomic Mass Evaluation 2003.« less
  • The Penning-trap mass spectrometer SHIPTRAP was set up with the aim to perform high-precision mass measurements. Since autumn 2005, the masses of 63 neutron-deficient nuclides in the mass range from A = 80 to A = 254 have been determined with relative uncertainties of down to 10{sup -8}. Nuclides with half-lives down to 580 ms and production rates of less than one atom per minute were investigated. The results are valuable for nuclear structure investigations and nuclear astrophysics. The most remarkable successes were the first direct mass measurements beyond the proton drip line and in the region above Z =more » 100.« less
  • Penning-trap mass spectrometry of radionuclides provides accurate mass values and absolute binding energies. Such mass measurements are sensitive indicators of the nuclear structure evolution far away from stability. Recently, direct mass measurements have been extended to the heavy elements nobelium (Z=102) and lawrencium (Z=103) with the Penning-trap mass spectrometer SHIPTRAP. The results probe nuclear shell effects at N=152. New developments will pave the way to access even heavier nuclides.