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.
Similar content being viewed by others
References
K. Amos, Phys. Rev. C 70, 024607 (2004).
A. Korgul, Phys. Rev. C 64, 021302(R) (2001).
J. Shergur, Phys. Rev. C 65, 034313 (2002).
H. Mach, Nucl. Phys. A 523, 197 (1991) and references therein.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
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
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjad/i2005-06-040-2