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Title: {gamma} emission from the 31-yr isomer of {sup 178}Hf induced by x-ray irradiation

Abstract

A sample containing 6.3x10{sup 14} nuclei of the 16{sup +} isomer of {sup 178}Hf having a half life of 31 years and excitation energy of 2.446 MeV was irradiated with x-ray pulses derived from a device operated at 15 mA to produce bremsstrahlung radiation with an end point energy set to be 63 keV. Gamma spectra of the isomeric target were taken with two independent Ge detectors. Intensities of the 213.4 keV (4{sup +}{yields}2{sup +}) and 325.5 keV (6{sup +}{yields}4{sup +}) transitions in the ground state band of {sup 178}Hf were found to increase when irradiated. The largest enhancement was 1.6{+-}0.3% measured in the 213.4 keV transition. Such an accelerated decay of the {sup 178}Hf isomer is consistent with an integrated cross section exceeding 2.2x10{sup -22} cm{sup 2} keV if the resonant absorption takes place below 20 keV as indicated by the use of selective absorption filters in the irradiating beam. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3]
  1. Center for Quantum Electronics, University of Texas at Dallas, Richardson, Texas 75083 (United States)
  2. Joint Institute for Nuclear Research, Dubna 141980, Russia (Russian Federation)
  3. H. Hulubei National Institute of Physics and Nuclear Engineering and IGE Foundation, Bucharest, (Romania)
Publication Date:
OSTI Identifier:
20216343
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; HAFNIUM 178 TARGET; PHOTONUCLEAR REACTIONS; GAMMA SPECTRA; RADIATIVE DECAY; ISOMERIC NUCLEI; EXPERIMENTAL DATA

Citation Formats

Collins, C. B., Davanloo, F., Rusu, A. C., Iosif, M. C., Zoita, N. C., Camase, D. T., Hicks, J. M., Karamian, S. A., Ur, C. A., and Popescu, I. I. {gamma} emission from the 31-yr isomer of {sup 178}Hf induced by x-ray irradiation. United States: N. p., 2000. Web. doi:10.1103/PhysRevC.61.054305.
Collins, C. B., Davanloo, F., Rusu, A. C., Iosif, M. C., Zoita, N. C., Camase, D. T., Hicks, J. M., Karamian, S. A., Ur, C. A., & Popescu, I. I. {gamma} emission from the 31-yr isomer of {sup 178}Hf induced by x-ray irradiation. United States. doi:10.1103/PhysRevC.61.054305.
Collins, C. B., Davanloo, F., Rusu, A. C., Iosif, M. C., Zoita, N. C., Camase, D. T., Hicks, J. M., Karamian, S. A., Ur, C. A., and Popescu, I. I. Mon . "{gamma} emission from the 31-yr isomer of {sup 178}Hf induced by x-ray irradiation". United States. doi:10.1103/PhysRevC.61.054305.
@article{osti_20216343,
title = {{gamma} emission from the 31-yr isomer of {sup 178}Hf induced by x-ray irradiation},
author = {Collins, C. B. and Davanloo, F. and Rusu, A. C. and Iosif, M. C. and Zoita, N. C. and Camase, D. T. and Hicks, J. M. and Karamian, S. A. and Ur, C. A. and Popescu, I. I.},
abstractNote = {A sample containing 6.3x10{sup 14} nuclei of the 16{sup +} isomer of {sup 178}Hf having a half life of 31 years and excitation energy of 2.446 MeV was irradiated with x-ray pulses derived from a device operated at 15 mA to produce bremsstrahlung radiation with an end point energy set to be 63 keV. Gamma spectra of the isomeric target were taken with two independent Ge detectors. Intensities of the 213.4 keV (4{sup +}{yields}2{sup +}) and 325.5 keV (6{sup +}{yields}4{sup +}) transitions in the ground state band of {sup 178}Hf were found to increase when irradiated. The largest enhancement was 1.6{+-}0.3% measured in the 213.4 keV transition. Such an accelerated decay of the {sup 178}Hf isomer is consistent with an integrated cross section exceeding 2.2x10{sup -22} cm{sup 2} keV if the resonant absorption takes place below 20 keV as indicated by the use of selective absorption filters in the irradiating beam. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevC.61.054305},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 5,
volume = 61,
place = {United States},
year = {2000},
month = {5}
}