Production of very neutron-rich Pd isotopes around <i>N</i> = 82 by projectile fragmentation of a RI beam of <sup>132</sup>Sn at 280 MeV/u
ORAL
Abstract
We have produced very neutron-rich Pd isotopes around N = 82 by projectile fragmentation of a radioactive isotope (RI) beam of 132Sn using the BigRIPS separator and the ZeroDegree spectrometer at RIKEN RI Beam Factory.
A two-step reaction scheme [1], a projectile fragmentation of RI beams, has been proposed for production of mid-heavy very-neutron-rich RIs around N = 82. In this scheme, a long-lived RI (e.g. 132Sn) is produced by ISOL and post-accelerated, then more exotic nuclei (125-128Pd) are produced by fragmentation. This scheme may have an advantage for obtaining yields of such RIs compared to in-flight fission of 238U or direct production by ISOL. The in-flight fission of 238U is useful for production of mid-heavy nuclei, whereas the production cross-sections decrease drastically in such exotic region. On the other hand, much yields are obtained in target by ISOL, whereas exotic nuclei with half-lives < ~1 ms cannot be supplied because of bad extraction efficiency.
To evaluate the usefulness of the two-step reaction scheme, we have measured the cross sections of the neutron-rich RIs produced from the 132Sn beam and compared their production yields by this scheme and the in-flight fission of 238U.
Reference
[1] K. Helariutta et al., Eur. Phys. J. A 17 (2003) 181.
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Presenters
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Hiroshi Suzuki
- RIKEN Nishina Center, RIKEN
- RIKEN Nishina Center