https://doi.org/10.1140/epjad/i2005-06-192-y
ENAM 2004
Discovery of 60Ge and 64Se
1
National Superconducting Cyclotron Laboratory, 48824, East Lansing, MI, USA
2
Department of Physics & Astronomy, Michigan State University, 48824, East Lansing, MI, USA
3
Department of Chemistry, Michigan State University, 48824, East Lansing, MI, USA
* e-mail: stolz@nscl.msu.edu
Received:
17
January
2005
Accepted:
28
April
2005
Published online:
15
July
2005
Very neutron-deficient fragments were produced by projectile fragmentation of a 140 MeV/ nucleon 78Kr primary beam on a beryllium target. The secondary fragments were unambiguously identified after separation in the A1900 fragment separator. Three events of 60Ge and four events of 64Se have been observed for the first time, making 60Ge the heaviest known isotone of the N = 28 neutron shell. No events of 59Ga and 63As have been observed providing very strong evidence that these nuclei are unbound with respect to proton emission.
PACS: 25.70.Mn Projectile and target fragmentation – / 27.50.+e 59 ⩽ A ⩽ 89 – / 23.50.+z Decay by proton emission –
© Società Italiana di Fisica and Springer-Verlag, 2005
