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Title: Isomer {sup 152m}Eu(8{sup -}) as an object for studying effects of fundamental-symmetry violation

Abstract

No abstract prepared.

Authors:
;  [1]; ;  [2];  [1]; ;  [3];  [1]
  1. Russian Academy of Sciences, Petersburg Nuclear Physics Institute (Russian Federation)
  2. Joint Institute for Nuclear Research (Russian Federation)
  3. Moscow State University, Institute of Nuclear Physics (Russian Federation), E-mail: tchuvl@nucl-th.sinp.msu.ru
Publication Date:
OSTI Identifier:
21075930
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 70; Journal Issue: 2; Other Information: DOI: 10.1134/S1063778807020214; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; EUROPIUM 152; HEAVY IONS; ISOMERS; MULTICHARGED IONS; SYMMETRY BREAKING

Citation Formats

Aldushchenkov, A. V., Okunev, I. S., Parzhitsky, S. S., Sinyakov, A. V., Smotritsky, L. M., Chuvilskaya, T. V., Tchuvil'sky, Yu. M., and Shulyak, E. I.. Isomer {sup 152m}Eu(8{sup -}) as an object for studying effects of fundamental-symmetry violation. United States: N. p., 2007. Web. doi:10.1134/S1063778807020214.
Aldushchenkov, A. V., Okunev, I. S., Parzhitsky, S. S., Sinyakov, A. V., Smotritsky, L. M., Chuvilskaya, T. V., Tchuvil'sky, Yu. M., & Shulyak, E. I.. Isomer {sup 152m}Eu(8{sup -}) as an object for studying effects of fundamental-symmetry violation. United States. doi:10.1134/S1063778807020214.
Aldushchenkov, A. V., Okunev, I. S., Parzhitsky, S. S., Sinyakov, A. V., Smotritsky, L. M., Chuvilskaya, T. V., Tchuvil'sky, Yu. M., and Shulyak, E. I.. Thu . "Isomer {sup 152m}Eu(8{sup -}) as an object for studying effects of fundamental-symmetry violation". United States. doi:10.1134/S1063778807020214.
@article{osti_21075930,
title = {Isomer {sup 152m}Eu(8{sup -}) as an object for studying effects of fundamental-symmetry violation},
author = {Aldushchenkov, A. V. and Okunev, I. S. and Parzhitsky, S. S. and Sinyakov, A. V. and Smotritsky, L. M. and Chuvilskaya, T. V. and Tchuvil'sky, Yu. M. and Shulyak, E. I.},
abstractNote = {No abstract prepared.},
doi = {10.1134/S1063778807020214},
journal = {Physics of Atomic Nuclei},
number = 2,
volume = 70,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}
  • The standard γ-ray energy calibration source 152Eu is well known based on the 13.5 y decay of its ground state. Nevertheless, in addition to this decay 152Eu also has two relatively long-lived isomeric states: a 9 h J π=0 - state at E *=46 keV and a 96 min J π=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 152Eu were populated following the 154Sm (p,3n) reaction using a 25 MeV proton beam from the K-150 cyclotron at the Cyclotron Institute of Texas A&Mmore » 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 J π=8 - isomer 152m2Eu 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 151m1Eu, the J π=0 - state at 46 keV, β decays to excited states in 152Gd and 152Sm. Also, the half-life of this state was measured to be 9.39(7) h using five γ-ray transitions.« less
  • Acceleration of thermal neutrons by isomers was observed for the first time. For /sup 152m/Eu the cross section for inelastic acceleration is: sigma/sub i/n =0.28 +- 0.06 b.
  • The results of broad searches for schemes that are convenient for observing effects of time-inversion-invariance violation (T violation) simultaneously with parity violation (PT violation) in electromagnetic transitions in nuclei are presented. The main problems in observing such effects are discussed. A scheme that seems one of the most promising for this and which relies on measuring the linear polarization of gamma radiation accompanying the deexcitation of isomeric states of nuclei that were oriented by a magnetic field at ultralow temperatures is highlighted.