@article{8238e82b0632429b89c90127848df8e5,
title = "Improved measurement of the half-life of the Jπ=8- nuclear isomer Eu 152m2",
abstract = "The standard γ-ray energy calibration source Eu152 is well known based on the 13.5 y decay of its ground state. However, in addition to this decay Eu152 also has two relatively long-lived isomeric states: a 9 h Jπ=0- state at E∗=46 keV and a 96 min Jπ=8- state at E∗=148 keV. Here we report a new measurement of the half-lives of both of these isomeric states. Excited states in Eu152 were populated following the Sm154(p,3n) reaction using a 25 MeV proton beam from the K-150 cyclotron at the Cyclotron Institute of Texas A&M University. Post irradiation, γ rays from the de-excitation of the long lived isomeric states were measured using the six BGO shielded high-purity germanium (HPGe) clover detectors that are part of the STARLiTeR array. The half-life of the Jπ=8- isomer Eu152m2 was obtained by measuring the decrease in intensity of the 90 keV γ ray from the cascade to the ground state. The half-life of this state was measured to be 95.8(4) min which is in agreement with and significantly more precise than the previously measured value of 96(1) min. In a manner similar to the ground state the second long-lived isomer Eu151m1, the Jπ=0- state at 46 keV, β decays to excited states in Gd152 and Sm152. The half-life of this state was measured to be 9.39(7) h using five γ-ray transitions.",
author = "P. Humby and A. Simon and Beausang, {C. W.} and Ross, {T. J.} and Hughes, {R. O.} and Burke, {J. T.} and Casperson, {R. J.} and J. Koglin and S. Ota and Allmond, {J. M.} and M. McCleskey and E. McCleskey and A. Saastamoinen and R. Chyzh and M. Dag and K. Gell and T. Tarlow and G. Vyas",
note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",
year = "2015",
month = feb,
day = "23",
doi = "10.1103/PhysRevC.91.024322",
language = "English",
volume = "91",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
number = "2",
}