Discovery of a sub-μs Isomer in ^140Eu

Details Discovery of a sub-μs Isomer in ^140Eu Discovery of a sub-μs Isomer in ^140Eu

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre10002t&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

While investigating the proton drip line nucleus ^140Dy, a new very short-lived mass 140 isomer was discovered as a by-product. The activity was produced by the bombardment of ^92Mo with a 315-MeV ^54Fe beam from the Holifield Radioactive Ion Beam Facility. The mass 140 evaporation residues were collected at the focal plane of the Recoil Mass Spectrometer and studied by an array of clover germanium detectors. A short-lived ( ~350 ns) gamma emitting isomer was observed along with the gamma-ray coincidence relationships. The gammas were coincident with Eu x-rays and, hence, the isomer must be in ^140Eu. The experimental arrangement and the isomeric decay scheme will be discussed.

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