News from Spiral

  • Alex C. Mueller


Secondary radioactive beams are still a very new tool, but already it has become clear that they provide unique research opportunities (see, e.g., ref.12 and references therein). So far, energetic radioactive beams have essentially been made by the use of heavy-ion accelerators in connection with in-flight separation through recoil spectrometers. This technique relies on the forward focusing present in peripheral nuclear reactions. The concept of fragment-separators has been pioneered with relativistic heavy ion-beams at Berkeley using beam-line elements, and later, for intermediate-energy beams, at GANIL, by means of the dedicated doubly achromatic spectrometer LISE. During the last years, new devices for fragment separation have been constructed and put into operation at GSI (“FRS”), MSU-NSCL (“Al200”), RIKEN (“RIPS”) and also a second apparatus at GANIL (“SISSI”). The success of the concept may be evident from the fact that these devices are used during more than 80% of the beam time at the NSCL or at GANIL. The optical quality from secondary projectile-fragment beams is somewhat limited, however, in particular when one aims at high transmission of the fragment separator, privileging its acceptance in solid angle and momentum. Furthermore, it is impossible to attain energies below, say 25 MeV/u, by energy degrading through passage of matter and to simultaneously maintain reasonable optical properties and conserve the intensity. The very elegant technique of cooling and decelerating in a storage ring is also limited by transmission and duty factor and, in particular for short-lived nuclei, by the prohibitive cooling times.


High Charge State Radioactive Beam Fragment Separator Projectile Fragmentation Unique Research Opportunity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Alex C. Mueller and Bradley M. Sherrill, 1993, Ann. Rev. Nucl. Part. Sci. 43: 529ADSCrossRefGoogle Scholar
  2. 2.
    H. Geissel, G. Münzenberg, K. Riisager, 1995, Ann. Rev. Nucl. Pari. Sci. 45: 163ADSCrossRefGoogle Scholar
  3. 3.
    Report on the European Radioactive Beam Facilities from the NuPECC Study Group R.H. Siemssen (chair) et al., 1993, E.G. Körner ed., NuPECC, MünchenGoogle Scholar
  4. 4.
    The Isospin Laboratory, Research Opportunities with Radioactive Ion Beams, 1991, LALPReport 91–51Google Scholar
  5. 5.
    M. Loiselet et al., May 1993, 3rd International Conference on Radioactive Nuclear Beams, East Lansing, MI., USA, D.J. Morrissey, ed. Editions Frontières, Gif-sur-Yvette (1993), p. 179Google Scholar
  6. 6.
    Alex C. Mueller, June 1995, Proceedings of the International Conference on Exotic Nuclei and Atomic Masses, Arles, France, O. Sorlin, M. de Saint-Simon eds., Editions Frontières, Gif-sur Yvette (1996), in press and preprint IPN Orsay IPNO DRE 95–21Google Scholar
  7. 7.
    The SPIRAL Radioactive Ion Beam Facility, 1994, Ganil-Report R-94–02, CaenGoogle Scholar
  8. 8.
    Alex C. Mueller, 1995, Nucl. Phys. News Vol.5 3: 7CrossRefGoogle Scholar
  9. 9.
    M. Lieuvin, 14th International Conference on Cyclotrons and their Applications, 8–13 October 1995, Cape Town, South Africa, Ganil Report S 95–04 and World Scientific Publ. in pressGoogle Scholar
  10. 10.
    A.C.C. Villari et al., 1995, Nucl. Phys. A 588:267 cGoogle Scholar
  11. 11.
    J. Obert and J.C. Putaux, 1995, Report of the Ramp;D at IPN Orsay 1994–1995, S. Galès ed., Orsay, p. 37Google Scholar
  12. 12.
    B. Bru, A. Chabert, Ch. Ricaud, 1994, Nucl. Inst. Meth. A 351: 371ADSCrossRefGoogle Scholar
  13. 13.
    B. Launé, October 1995, 14th International Conference on Cyclotrons and their Applications, 8–13 October Cape Town, South Africa, World Scientific Publ. in pressGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Alex C. Mueller
    • 1
  1. 1.CNRS-IN2P3Institut de Physique NucléaireOrsayFrance

Personalised recommendations