Mass measurements of relativistic projectile fragments in the storage ring ESR

T. Radon, H. Geissel, F. Attallah, K. Beckert, F. Bosch, A. Dolinskiy, H. Eickhoff, M. Falch, B. Franczak, B. Franzke, Y. Fujita, M. Hausmann, M. Hellström, F. Herfurth, Th Kerscher, O. Klepper, H. J. Kluge, C. Kozhuharov, Yu Litvinov, K. E.G. LöbnerG. Münzenberg, F. Nolden, Yu Novikov, Z. Patyk, W. Quint, H. Reich, C. Scheidenberger, B. Schlitt, J. Stadlmann, M. Steck, K. Sümmerer, L. Vermeeren, M. Winkler, Th Winkler, H. Wollnik

Research output

4 Citations (Scopus)

Abstract

Two experimental methods of measuring masses of exotic nuclei in the storage ring ESR are presented. Bismuth and nickel fragments were produced via projectile fragmentation, separated and investigated with the combination of the flagment separator FRS and the ESR: (i) Direct mass measurements of relativistic projectile fragments were performed using Schottky mass spectrometry (SMS), i.e., exotic nuclei were stored and cooled in the ESR. Applying electron cooling, the relative velocity spread of circulating low intensity beams can be reduced below 10-6. Under this condition a mass resolving power of up to m/Δm = 6.5·105 (FWHM) was achieved in a recent measurement. Previously unknown masses of more than 100 neutron-deficient isotopes have been measured in the range of 60≤Z≤84. Using known Qα values the area of known masses could be extended to more exotic nuclei and to higher proton numbers. The results are compared with mass models and extrapolations of experimental values. In a second experiment with 209Bi projectiles the area of the measured masses was extended to lower proton numbers. Due to various improvements at the ESR the precision of the measurements could be raised. (ii) Exotic nuclei with half-lives shorter than the time needed for SMS (present limit: T1/2≈5 sec) can be investigated by time-of-flight measurements whereby the ESR is operated in the isochronous mode. This novel experimental technique has been successfully applied in first measurements with nickel and neon fragments where a mass resolving power of m/Δm = 1.5·105 (FWHM) was achieved.

Original languageEnglish
Pages (from-to)609-618
Number of pages10
JournalPramana - Journal of Physics
Volume53
Issue number3
DOIs
Publication statusPublished - 1 Jan 1999
EventProceedings of the 1998 International Workshop on Rare Nuclear Processes in Low Energy Heavy Ion Physics (IWRNP-98) - New Delhi, India
Duration: 16 Nov 199820 Nov 1998

Fingerprint

projectiles
fragments
nuclei
mass spectroscopy
nickel
protons
separators
half life
neon
bismuth
extrapolation
fragmentation
isotopes
cooling
neutrons
electrons

Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Radon, T., Geissel, H., Attallah, F., Beckert, K., Bosch, F., Dolinskiy, A., ... Wollnik, H. (1999). Mass measurements of relativistic projectile fragments in the storage ring ESR. Pramana - Journal of Physics, 53(3), 609-618. https://doi.org/10.1007/s12043-999-0038-3
Radon, T. ; Geissel, H. ; Attallah, F. ; Beckert, K. ; Bosch, F. ; Dolinskiy, A. ; Eickhoff, H. ; Falch, M. ; Franczak, B. ; Franzke, B. ; Fujita, Y. ; Hausmann, M. ; Hellström, M. ; Herfurth, F. ; Kerscher, Th ; Klepper, O. ; Kluge, H. J. ; Kozhuharov, C. ; Litvinov, Yu ; Löbner, K. E.G. ; Münzenberg, G. ; Nolden, F. ; Novikov, Yu ; Patyk, Z. ; Quint, W. ; Reich, H. ; Scheidenberger, C. ; Schlitt, B. ; Stadlmann, J. ; Steck, M. ; Sümmerer, K. ; Vermeeren, L. ; Winkler, M. ; Winkler, Th ; Wollnik, H. / Mass measurements of relativistic projectile fragments in the storage ring ESR. In: Pramana - Journal of Physics. 1999 ; Vol. 53, No. 3. pp. 609-618.
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title = "Mass measurements of relativistic projectile fragments in the storage ring ESR",
abstract = "Two experimental methods of measuring masses of exotic nuclei in the storage ring ESR are presented. Bismuth and nickel fragments were produced via projectile fragmentation, separated and investigated with the combination of the flagment separator FRS and the ESR: (i) Direct mass measurements of relativistic projectile fragments were performed using Schottky mass spectrometry (SMS), i.e., exotic nuclei were stored and cooled in the ESR. Applying electron cooling, the relative velocity spread of circulating low intensity beams can be reduced below 10-6. Under this condition a mass resolving power of up to m/Δm = 6.5·105 (FWHM) was achieved in a recent measurement. Previously unknown masses of more than 100 neutron-deficient isotopes have been measured in the range of 60≤Z≤84. Using known Qα values the area of known masses could be extended to more exotic nuclei and to higher proton numbers. The results are compared with mass models and extrapolations of experimental values. In a second experiment with 209Bi projectiles the area of the measured masses was extended to lower proton numbers. Due to various improvements at the ESR the precision of the measurements could be raised. (ii) Exotic nuclei with half-lives shorter than the time needed for SMS (present limit: T1/2≈5 sec) can be investigated by time-of-flight measurements whereby the ESR is operated in the isochronous mode. This novel experimental technique has been successfully applied in first measurements with nickel and neon fragments where a mass resolving power of m/Δm = 1.5·105 (FWHM) was achieved.",
author = "T. Radon and H. Geissel and F. Attallah and K. Beckert and F. Bosch and A. Dolinskiy and H. Eickhoff and M. Falch and B. Franczak and B. Franzke and Y. Fujita and M. Hausmann and M. Hellstr{\"o}m and F. Herfurth and Th Kerscher and O. Klepper and Kluge, {H. J.} and C. Kozhuharov and Yu Litvinov and L{\"o}bner, {K. E.G.} and G. M{\"u}nzenberg and F. Nolden and Yu Novikov and Z. Patyk and W. Quint and H. Reich and C. Scheidenberger and B. Schlitt and J. Stadlmann and M. Steck and K. S{\"u}mmerer and L. Vermeeren and M. Winkler and Th Winkler and H. Wollnik",
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Radon, T, Geissel, H, Attallah, F, Beckert, K, Bosch, F, Dolinskiy, A, Eickhoff, H, Falch, M, Franczak, B, Franzke, B, Fujita, Y, Hausmann, M, Hellström, M, Herfurth, F, Kerscher, T, Klepper, O, Kluge, HJ, Kozhuharov, C, Litvinov, Y, Löbner, KEG, Münzenberg, G, Nolden, F, Novikov, Y, Patyk, Z, Quint, W, Reich, H, Scheidenberger, C, Schlitt, B, Stadlmann, J, Steck, M, Sümmerer, K, Vermeeren, L, Winkler, M, Winkler, T & Wollnik, H 1999, 'Mass measurements of relativistic projectile fragments in the storage ring ESR', Pramana - Journal of Physics, vol. 53, no. 3, pp. 609-618. https://doi.org/10.1007/s12043-999-0038-3

Mass measurements of relativistic projectile fragments in the storage ring ESR. / Radon, T.; Geissel, H.; Attallah, F.; Beckert, K.; Bosch, F.; Dolinskiy, A.; Eickhoff, H.; Falch, M.; Franczak, B.; Franzke, B.; Fujita, Y.; Hausmann, M.; Hellström, M.; Herfurth, F.; Kerscher, Th; Klepper, O.; Kluge, H. J.; Kozhuharov, C.; Litvinov, Yu; Löbner, K. E.G.; Münzenberg, G.; Nolden, F.; Novikov, Yu; Patyk, Z.; Quint, W.; Reich, H.; Scheidenberger, C.; Schlitt, B.; Stadlmann, J.; Steck, M.; Sümmerer, K.; Vermeeren, L.; Winkler, M.; Winkler, Th; Wollnik, H.

In: Pramana - Journal of Physics, Vol. 53, No. 3, 01.01.1999, p. 609-618.

Research output

TY - JOUR

T1 - Mass measurements of relativistic projectile fragments in the storage ring ESR

AU - Radon, T.

AU - Geissel, H.

AU - Attallah, F.

AU - Beckert, K.

AU - Bosch, F.

AU - Dolinskiy, A.

AU - Eickhoff, H.

AU - Falch, M.

AU - Franczak, B.

AU - Franzke, B.

AU - Fujita, Y.

AU - Hausmann, M.

AU - Hellström, M.

AU - Herfurth, F.

AU - Kerscher, Th

AU - Klepper, O.

AU - Kluge, H. J.

AU - Kozhuharov, C.

AU - Litvinov, Yu

AU - Löbner, K. E.G.

AU - Münzenberg, G.

AU - Nolden, F.

AU - Novikov, Yu

AU - Patyk, Z.

AU - Quint, W.

AU - Reich, H.

AU - Scheidenberger, C.

AU - Schlitt, B.

AU - Stadlmann, J.

AU - Steck, M.

AU - Sümmerer, K.

AU - Vermeeren, L.

AU - Winkler, M.

AU - Winkler, Th

AU - Wollnik, H.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - Two experimental methods of measuring masses of exotic nuclei in the storage ring ESR are presented. Bismuth and nickel fragments were produced via projectile fragmentation, separated and investigated with the combination of the flagment separator FRS and the ESR: (i) Direct mass measurements of relativistic projectile fragments were performed using Schottky mass spectrometry (SMS), i.e., exotic nuclei were stored and cooled in the ESR. Applying electron cooling, the relative velocity spread of circulating low intensity beams can be reduced below 10-6. Under this condition a mass resolving power of up to m/Δm = 6.5·105 (FWHM) was achieved in a recent measurement. Previously unknown masses of more than 100 neutron-deficient isotopes have been measured in the range of 60≤Z≤84. Using known Qα values the area of known masses could be extended to more exotic nuclei and to higher proton numbers. The results are compared with mass models and extrapolations of experimental values. In a second experiment with 209Bi projectiles the area of the measured masses was extended to lower proton numbers. Due to various improvements at the ESR the precision of the measurements could be raised. (ii) Exotic nuclei with half-lives shorter than the time needed for SMS (present limit: T1/2≈5 sec) can be investigated by time-of-flight measurements whereby the ESR is operated in the isochronous mode. This novel experimental technique has been successfully applied in first measurements with nickel and neon fragments where a mass resolving power of m/Δm = 1.5·105 (FWHM) was achieved.

AB - Two experimental methods of measuring masses of exotic nuclei in the storage ring ESR are presented. Bismuth and nickel fragments were produced via projectile fragmentation, separated and investigated with the combination of the flagment separator FRS and the ESR: (i) Direct mass measurements of relativistic projectile fragments were performed using Schottky mass spectrometry (SMS), i.e., exotic nuclei were stored and cooled in the ESR. Applying electron cooling, the relative velocity spread of circulating low intensity beams can be reduced below 10-6. Under this condition a mass resolving power of up to m/Δm = 6.5·105 (FWHM) was achieved in a recent measurement. Previously unknown masses of more than 100 neutron-deficient isotopes have been measured in the range of 60≤Z≤84. Using known Qα values the area of known masses could be extended to more exotic nuclei and to higher proton numbers. The results are compared with mass models and extrapolations of experimental values. In a second experiment with 209Bi projectiles the area of the measured masses was extended to lower proton numbers. Due to various improvements at the ESR the precision of the measurements could be raised. (ii) Exotic nuclei with half-lives shorter than the time needed for SMS (present limit: T1/2≈5 sec) can be investigated by time-of-flight measurements whereby the ESR is operated in the isochronous mode. This novel experimental technique has been successfully applied in first measurements with nickel and neon fragments where a mass resolving power of m/Δm = 1.5·105 (FWHM) was achieved.

UR - http://www.scopus.com/inward/record.url?scp=0032594018&partnerID=8YFLogxK

U2 - 10.1007/s12043-999-0038-3

DO - 10.1007/s12043-999-0038-3

M3 - Conference article

AN - SCOPUS:0032594018

VL - 53

SP - 609

EP - 618

JO - Pramana - Journal of Physics

JF - Pramana - Journal of Physics

SN - 0304-4289

IS - 3

ER -

Radon T, Geissel H, Attallah F, Beckert K, Bosch F, Dolinskiy A et al. Mass measurements of relativistic projectile fragments in the storage ring ESR. Pramana - Journal of Physics. 1999 Jan 1;53(3):609-618. https://doi.org/10.1007/s12043-999-0038-3