Nuclear structure studies of microsecond isomers near A = 100

G. Simpson, J. Genevey, J. A. Pinston, W. Urban, A. Złomaniec, R. Orlandi, A. Scherillo, I. Tsekhanovich, A. G. Smith, A. Thallon, B. J. Varley, J. Jolie, N. Warr

    Research output: Contribution to journalArticlepeer-review


    A large variety of shapes may be observed in Sr and Zr nuclei of the A = 100 region when the number of neutrons increases from N = 58 to N = 64. The lighter isotopes are rather spherical. It is also well established that three shapes co-exist in the transitional odd-A, N = 59, Sr and Zr nuclei. For N > 59, strongly deformed axially symmetric bands are observed. Recently, a new isomer of half-life 1.4(2) μs was observed in 95Kr, the odd-odd 96Rb has been reinvestigated and a new high-spin isomer observed in the even-even 98Zr. These nuclei were studied by means of prompt γ-ray spectroscopy of the spontaneous fission of 248Cm using the EUROGAM 2 Ge array and/or measurements of μs isomers produced by fission of 239,241Pu with thermal neutrons at the ILL (Grenoble). To allow spectroscopic studies of isomeric states with lifetimes around 100 ns, across a broad range of medium-heavy neutron-rich nuclei, an experiment was performed at a neutron guide of the ILL using thermal-neutron-induced fission. Fission fragments were identified using a small spectrometer consisting of a section to measure time-of-flight and an ionization chamber. Isomeric γ rays emitted from complementary fragments were detected in an array of Ge detectors.
    Original languageEnglish
    Pages (from-to)1321-1330
    Number of pages9
    JournalActa Physica Polonica B : Elementary Particle Physics, Nuclear Physics, Statistical Physics, Theory of Relativity, Field Theory
    Issue number4
    Publication statusPublished - Apr 2007


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