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Title: Accurate measurement of the first excited nuclear state in U 235

Abstract

In this paper, we have used superconducting high-resolution radiation detectors to measure the energy level of metastable $$^{235m}\mathrm{U}$$ as 76.737 ± 0.018 eV. The $$^{235m}\mathrm{U}$$ isomer is created from the α decay of $$^{239}\mathrm{Pu}$$ and embedded directly into the detector. When the $$^{235m}\mathrm{U}$$ subsequently decays, the energy is fully contained within the detector and is independent of the decay mode or the chemical state of the uranium. The detector is calibrated using an energy comb from a pulsed UV laser. Finally, a comparable measurement of the metastable $$^{229m}\mathrm{Th}$$ nucleus would enable a laser search for the exact transition energy in $$^{229}\mathrm{Th}{-}^{229m}\mathrm{Th}$$ as a step towards developing the first ever nuclear (baryonic) clock.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); STAR Cryoelectronics LLC, Santa Fe, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); LLNL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1436587
Alternate Identifier(s):
OSTI ID: 1436821
Grant/Contract Number:  
SC0004359; SC0006214; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; isomer decays; lifetimes & widths; spectrometers & spectroscopic techniques

Citation Formats

Ponce, F., Swanberg, E., Burke, J., Henderson, R., and Friedrich, S. Accurate measurement of the first excited nuclear state in U235. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.054310.
Ponce, F., Swanberg, E., Burke, J., Henderson, R., & Friedrich, S. Accurate measurement of the first excited nuclear state in U235. United States. doi:10.1103/PhysRevC.97.054310.
Ponce, F., Swanberg, E., Burke, J., Henderson, R., and Friedrich, S. Thu . "Accurate measurement of the first excited nuclear state in U235". United States. doi:10.1103/PhysRevC.97.054310. https://www.osti.gov/servlets/purl/1436587.
@article{osti_1436587,
title = {Accurate measurement of the first excited nuclear state in U235},
author = {Ponce, F. and Swanberg, E. and Burke, J. and Henderson, R. and Friedrich, S.},
abstractNote = {In this paper, we have used superconducting high-resolution radiation detectors to measure the energy level of metastable $^{235m}\mathrm{U}$ as 76.737 ± 0.018 eV. The $^{235m}\mathrm{U}$ isomer is created from the α decay of $^{239}\mathrm{Pu}$ and embedded directly into the detector. When the $^{235m}\mathrm{U}$ subsequently decays, the energy is fully contained within the detector and is independent of the decay mode or the chemical state of the uranium. The detector is calibrated using an energy comb from a pulsed UV laser. Finally, a comparable measurement of the metastable $^{229m}\mathrm{Th}$ nucleus would enable a laser search for the exact transition energy in $^{229}\mathrm{Th}{-}^{229m}\mathrm{Th}$ as a step towards developing the first ever nuclear (baryonic) clock.},
doi = {10.1103/PhysRevC.97.054310},
journal = {Physical Review C},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

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