Study of the gamma emission from the 31-yr isomer of 178Hf induced by x-ray irradiation

Autor:	P. McDaniel, J. M. Hicks, I. I. Popescu, Remi Dussart, Farzin Davanloo, V. I. Kirischuk, M. C. Iosif, J. M. Pouvesle, C. A. Ur, Carl B. Collins, C. E. Crist, S. A. Karamian
Rok vydání:	2000
Předmět:	Physics Nuclear and High Energy Physics Astrophysics::High Energy Astrophysical Phenomena Gamma ray Bremsstrahlung Flux Emission spectrum Irradiation Atomic physics Atomic and Molecular Physics and Optics Spectral line Excitation Intensity (physics)
Zdroj:	Physics of Atomic Nuclei. 63:2067-2072
ISSN:	1562-692X 1063-7788
DOI:	10.1134/1.1333875
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ed46d1792485d37de1b3fdf7cdd1ce0 https://doi.org/10.1134/1.1333875 Zobrazit plný text záznamu Plný text ve formátu PDF