Prompt and delayed spectroscopy of ²⁰³At : observation of a shears band and a 29/2+ isomeric state
|Author:||Auranen, K.1,2; Uusitalo, J.1; Juutinen, S.1;|
1University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
4Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
5Present address: Department of Chemistry - Radiochemistry, P.O. Box 55, FI-00014 University of Helsinki, Finland
6School of Physics and Astronomy, Schuster Building, University of Manchester, Manchester M13 9PL, United Kingdom
7Present address: University of Oulu, Sodankylä Geophysical Observatory, Tähteläntie 62, FI-99600 Sodankylä, Finland
8State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
|Online Access:||PDF Full Text (PDF, 1.1 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe202003238868
American Physical Society,
|Publish Date:|| 2020-03-23
Using fusion-evaporation reactions, a gas-filled recoil separator, recoil-gating technique and recoil-isomer decay tagging technique we have extended the level scheme of ²⁰³At (N = 118) significantly. We have observed an isomeric [τ=14.1(3)μs] state with a spin and parity of 29/2+. The isomeric state is suggested to originate from the π(h9/2)⊗∣∣²⁰²Po;11⁻⟩ coupling, and it is depopulated through 286 keV E2 and 366 keV E3 transitions. In addition, we have observed a cascade of magnetic-dipole transitions which is suggested to be generated by the shears mechanism.
Physical review. C
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
This work has been supported by the Academy of Finland under the Finnish Center of Excellence Programme (Contract number 213503). The authors also thank the GAMMAPOOL European Spectroscopy Resource for the loan of the detectors for the JUROGAM II array. Support has also been provided by the EU 7th framework programme, Project No. 262010 (ENSAR). K.A. acknowledges that this material is partially based upon work supported by the US Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DEAC02-06CH11357. A.H. and M.J.M. acknowledges partial support by the United Kingdom Science and Technology Facilities Council (STFC). Y.K.W. acknowledges that this work is partially supported by the Major State 973 Program of China (Grant No. 2013CB834400), the National Natural Science Foundation of China (Grants No. 11335002, No. 11375015, No. 11461141002, and No. 11621131001).
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