Article

Discovery of a 10<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:math>s isomeric state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow/><mml:mrow><mml:mn>63</mml:mn></mml:mrow><mml:mrow><mml:mn>139</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:math>Eu

D. M. CullenSchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomPaolo MasonSchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomC. ScholeyDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandS. EeckhaudtDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandT. GrahnDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandP. T. GreenleesDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandU. JakobssonDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandPeter G. JonesDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandR. JulinDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandS. JuutinenDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandS. KetelhutDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandA. KishadaSchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomM. LeinoDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandA.-P. LeppänenDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandK. MäntyniemiDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandP. NieminenDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandM. NymanDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandJ. PakarinenDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandP. PeuraDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandM. G. ProcterSchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomP. RahkilaDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandS. V. RigbySchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomJ. SarénDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandJ. SorriDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandJ. UusitaloDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 FinlandB. J. VarleySchool of Physics and Astronomy, Schuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomM. VenhartDepartment of Physics, University of Jyväskylä, Jyväskylä, FIN-40014 Finland

Physical Review Cjournal2011lv

ABI

Abstract

Recoil-isomer tagging with the $^{54}\mathrm{Fe}$$+$$^{92}\mathrm{Mo}$ reaction was used to establish a 10(2)-$\ensuremath{\mu}$s isomeric state in $^{139}\mathrm{Eu}$. Prompt versus delayed $\ensuremath{\gamma}$-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton ${g}_{7/2}$ configuration. The decay of the isomer takes place through a single 26-keV $E1$ transition. The $\ensuremath{\gamma}$-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as a consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing $E1$ transitions. The isomeric nature of the state in $^{139}\mathrm{Eu}$ is reasoned to be because of difference in shape of the proton ${g}_{7/2}$ state and the proton ${h}_{11/2}$ ground state to which it decays.

Topics

Nuclear physics research studies Atomic and Molecular Physics Molecular Spectroscopy and Structure

Identifiers

DOI: 10.1103/physrevc.83.014316

Citations and references

Cited by 034 references

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