NDLI: On the unusual properties of the 282 keV state in 135Sb

Content Provider	Springer Nature Link
Author	Korgul, A. Mach, H. Brown, B. A. Covello, A. Garga, A. Fogelberg, B. Kurcewicz, W. Werner Malento, E. Orlandi, R. Sawicka, M.
Copyright Year	2007
Abstract	Recently the first excited state in 135Sb has been observed at the unexpectedly low excitation energy of only 282keV and interpreted as mainly d 5/2 proton coupled to the 134Sn core. Based on theoretical considerations it was suggested that its low excitation energy is related to a relative shift of the proton d 5/2 and g 7/2 orbits induced by the neutron excess. We have measured the lifetime of the 282keV state by the advanced time-delayed βγγ(t) method. The measured half-life, T 1/2 = 6.1(4)ns, yields exceptionally low limits of B(M1;5/21 +→7/21 +)≤3.0×10-4 μ 2 N and B(E2;5/21 +→7/21 +)≤54e 2 fm 4. These strongly hindered M1 and slow E2 transition rates are similar to those for the transition de-populating the first excited state at 405keV in 211Bi. Results of shell model calculations with realistic interactions are presented. The M1 decay rate was found to be extremely sensistive both to the wave function and to the M1 effective operator.
Starting Page	25
Ending Page	29
Page Count	5
File Format	PDF
ISSN	14346001
Journal	The European Physical Journal A - Hadrons and Nuclei
Volume Number	32
Issue Number	1
e-ISSN	1434601X
Language	English
Publisher	Società Italiana di Fisica
Publisher Date	2007-04-30
Publisher Place	Bologna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nuclear Physics, Heavy Ions, Hadrons Elementary Particles and Nuclei Nuclear Fusion
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics

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