55 research outputs found
Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations
Mouse Chromosome 11
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/46996/1/335_2004_Article_BF00648429.pd
cis-platinum(II) diamine dichloride causes mutation, transformation, and sister-chromatid exchanges in cultured mammalian cells
Assignment<sup>1</sup> of murine placental cathepsin R to mouse chromosome bands 13B2–B3 by fluorescence in situ hybridization
The use of selected monochromatic X-rays to induce a cascade of gamma transitions from the 31-year nuclear isomer to the 4 second isomeric state of Hf-178
The Hf-178m2 nuclear spin isomer stores 2.45 MeV of
energy for a half life of 31 years. Unperturbed, such nuclei radiate away
the stored energy through the emission of gamma photons from electromagnetic
(EM) transitions occurring within the nuclei. It has been shown that the
irradiation of samples containing such nuclei with pulsed X-rays can
accelerate the rate of the EM transitions by relaxing the selection rules
upon changes of angular momenta. To date, most work has been done with
incident X-ray energies between 9 and 10 keV, and in such cases the
acceleration of the rate of gamma emission is immediate. Reported here is a
channel for deexcitation excited by more energetic X-rays that results in a
cascade of gamma transitions that includes a 4 second statistical time lag.
This more protracted release of the energy stored in samples of the Hf-178m2
nuclear isomers encourages consideration of potential mechanical and thermal
applications
Gamma-ray transitions induced in nuclear spin isomers by X-rays
Because of the high density of energy storage and the large cross section for its release there is considerable significance of the triggering of induced gamma emission from nuclear spin isomers to efforts to develop intense sources of short-wavelength radiation. The work reported here describes the current experimental focus and results recently obtained
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