Abstract
A sample containing 6.3×1014 nuclei of the 16+ isomer of 178Hf having a half-life of 31 yr and an excitation energy of 2.446 MeV was irradiated with x-ray pulses from a device operated at 15 mA to produce bremsstrahlung with an endpoint energy of 90 keV. The gamma spectra of the isomeric target were taken with a Ge detector. The intensity of the 325.5-keV (6+ → 4+) transition in the ground-state band of 178Hf was found to increase by about 2%. Such an enhanced decay of the 178Hf isomer is consistent with an integrated cross section value of 3×10−23 cm2 keV if resonance absorption occurs within energy ranges corresponding to the maxima of the x-ray flux, either near 20 keV or at the energies of the characteristic emission lines of W.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. B. Collins et al., J. Appl. Phys. 53, 4645 (1982).
C. B. Collins, C. D. Eberhard, J. W. Glesener, and J. A. Anderson, Phys. Rev. C 37, 2267 (1988).
P. M. Walker et al., Phys. Lett. B 408, 42 (1997).
C. B. Collins et al., Phys. Rev. Lett. 82, 695 (1999).
C. B. Collins et al., Laser Phys. 9, 8 (1999).
S. A. Karamian, Invited Talk at LASERS'99 Conference, Quebec, Canada, 1999.
NNDC Online Data Service, Brookhaven National Laboratory, http://www.nndc.bnl.gov
Author information
Authors and Affiliations
Additional information
From Yadernaya Fizika, Vol. 63, No. 12, 2000, pp. 2163–2168.
Original English Text Copyright © 2000 by Collins, Davanloo, Iosif, Dussart, Hicks, Karamian, Ur, Popescu, Kirischuk, Pouvesle, McDaniel, Crist.
This article was submitted by the authors in English.
Rights and permissions
About this article
Cite this article
Collins, C.B., Davanloo, F., Iosif, M.C. et al. Study of the gamma emission from the 31-yr isomer of 178Hf induced by x-ray irradiation. Phys. Atom. Nuclei 63, 2067–2072 (2000). https://doi.org/10.1134/1.1333875
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.1333875