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On the structure of the anomalously low-lying 5/2+ state of 135Sb

  • ENAM 2004
  • Published:
The European Physical Journal A - Hadrons and Nuclei Aims and scope Submit manuscript

Abstract.

Recently the first-excited state in 135Sb has been observed at the excitation energy of only 282keV and, due to its properties, interpreted as representing mainly a configuration of a d5/2 proton coupled to the 134Sn core. It was suggested that its low-excitation is due to a relative shift of the proton d5/2 and g7/2 orbits due to the neutron excess. With the aim to provide more spectroscopic information on this anomalously low-lying 5/2+ state, we have measured its lifetime by the Advanced Time-Delayed βγγ(t) method at the OSIRIS fission product mass separator at Studsvik. The preliminarily measured half-life, T1/2 = 6.0(7)ns, yields an exceptionally low B(M1;5/21+ → 7/21+) value of ≤2.9×10-4μ2N. The result is discussed in the framework of shell model calculations.

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Correspondence to A. Korgul.

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Korgul, A., Mach, H., Brown, B.A. et al. On the structure of the anomalously low-lying 5/2+ state of 135Sb. Eur. Phys. J. A 25 (Suppl 1), 123–124 (2005). https://doi.org/10.1140/epjad/i2005-06-040-2

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  • DOI: https://doi.org/10.1140/epjad/i2005-06-040-2

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