Direct determination of the excitation energy of the quasistable isomer Ta180m

D. A. Nesterenko, K. Blaum, P. Delahaye, S. Eliseev, T. Eronen, P. Filianin, Z. Ge, M. Hukkanen, A. Kankainen, Yu. N. Novikov, A. V. Popov, A. Raggio, M. Stryjczyk, and V. Virtanen
Phys. Rev. C 106, 024310 – Published 8 August 2022

Abstract

Ta180m is a naturally abundant quasistable nuclide and the longest-lived nuclear isomer known to date. It is of interest, among others, for the search for dark matter, for the development of a γ laser, and for astrophysics. So far, its excitation energy has not been measured directly but has been based on an evaluation of available nuclear reaction data. We have determined the excitation energy of this isomer with high accuracy using the Penning-trap mass spectrometer JYFLTRAP. The determined mass difference between the ground and isomeric states of Ta180 yields an excitation energy of 76.79(55) keV for Ta180m. This is the first direct measurement of the excitation energy and provides a better accuracy than that of the previous evaluation value, 75.3(14) keV.

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  • Received 16 May 2022
  • Accepted 20 July 2022

DOI:https://doi.org/10.1103/PhysRevC.106.024310

©2022 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

D. A. Nesterenko1, K. Blaum2, P. Delahaye3, S. Eliseev2, T. Eronen1, P. Filianin2, Z. Ge4, M. Hukkanen1, A. Kankainen1, Yu. N. Novikov5, A. V. Popov5, A. Raggio1, M. Stryjczyk1, and V. Virtanen1

  • 1University of Jyväskylä, Accelerator Laboratory, Department of Physics, 40014 Jyväskylä, Finland
  • 2Max-Planck Institut für Kernphysik, 69117 Heidelberg, Germany
  • 3GANIL, CEA/DSM-CNRS/IN2P3, Boulevard Henri Becquerel, 14000 Caen, France
  • 4GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
  • 5NRC “Kurchatov Institute” - Petersburg Nuclear Physics Institute, Gatchina 188300, Russia

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Issue

Vol. 106, Iss. 2 — August 2022

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