Nuclear Data Sheets for A=189

Firestone, R.B.

doi:10.1016/s0090-3752(05)80124-3

Cited by 23 publications

(2 citation statements)

References 77 publications

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“…Much of the experimental and theoretical work has been dedicated to studies of the third excited state (5/2 -) of 189 Os, lying at 69.537 keV [21]. This state decays rapidly (1.6 ns) with a partial branch (~1.2 x 10 -3 ) to a lower-lying metastable (6-hr.…”

Section: Neetmentioning

confidence: 99%

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Nuclear Transitions Induced by Synchrotron X-rays

Gemmell¹

2003

AIP Conference Proceedings

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Abstract. We discuss two rare but interesting processes by which synchrotron x-rays with energies up to about 100 keV may be used to induce nuclear transitions.In the NEET (Nuclear Excitation by Electronic Transition) process, an intense x-ray beam is employed to make vacancies, e.g. K-holes, in the atoms of a specific nuclear isotope. When a vacancy is filled by an electronic transition from a higher atomic level, there is some probability that instead of the usual x-ray or Auger emission, the nucleus of the atom itself will be excited. This is then followed by a nuclear decay exhibiting characteristic gamma-rays or other types of radiation, with time delays typical of the nuclear states involved. The probability for NEET increases when the energies of the atomic and the nuclear transitions become close. We address some theoretical aspects of the process and describe experimental efforts to observe it in 189 Os and 197 Au.The second process to be discussed is the possibility of "triggering" the decay of a nuclear isomer by irradiation with an x-ray beam. We focus on the case of the 31-year, 2.4-MeV, 16+ isomer of 178 Hf. There has been speculation that if one could isolate gram quantities, say, of this isomer and then have the capability to accelerate its decay in a controlled way, one would have a powerful triggerable source of enormous energy. This could be used to generate explosions, for rapid irradiations, or for more general energy-storage applications, depending on the rate of energy release. We describe attempts to observe this process.

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Section: Neetmentioning

confidence: 99%

“…12 of Ref. [14], were calculated using wavefunctions from the "GRASP2" code [22], and tabulated values [21] of B(M1) and B(E2) were used for the nuclear transition. The Clebsch-Gordan coefficient refers to the total angular momenta j K of the K-vacancy and j M of the M-vacancy states.…”

Section: Neetmentioning

confidence: 99%