Nuclear data sheets for A = 197

Zhou, Chuangbing

doi:10.1016/0090-3752(91)80018-2

Cited by 22 publications

(3 citation statements)

References 244 publications

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“…In both cases, the transitions are of the M1 multipolarity. As to the energy of the nuclear 1/2 + level, it is 77.351 keV according to [8] and 77.339 ± 0.003 keV according to the last precision measurements [9]. The corresponding mismatch of the nuclear (E (n) 0 ) and atomic (E (a) 0 ) transition energies, defined as…”

Section: Introductionmentioning

confidence: 99%

Nuclear Excitation by Electron Transitions

Dzyublik

2013

Ukr. J. Phys.

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A theory of the nuclear excitation by an electron transition (NEET) induced by x-rays is developed on the basis of the strict collision theory. All stages of the process are considered, including the formation of a hole in an inner electronic shell, its decay leading to the excitation of the nucleus, as well as the subsequent filling of the upper level vacancy and the deexcitation of the nucleus. The cross sections are calculated for NEET and the photoabsorption of x-rays near the absorption edge. The results agree with the data of Kishimoto et al. for NEET on 197 Au. In addition, we discuss the NEET mechanism of triggering of the 31-year isomer 178 Hf m2 via an intermediate level induced by x-rays. We have shown that the 2% decay acceleration of this isomer declared by Collins et al. is realistic if the nucleus attributes a triaxial shape in the intermediate state, and there exists an additional rotational band with the 13 − level. K e y w o r d s: nuclear isomers, Hf, NEET, induced nuclear decay, x-rays.

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Section: Introductionmentioning

confidence: 99%

Nuclear Excitation by Electron Transitions

Dzyublik

2013

Ukr. J. Phys.

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“…Both transitions are M1/E2. However, the excited nuclear state has a half-life of only 1.91 ns [26] and so the decay radiation from the state (mainly L internal-conversion electrons) is extremely difficult to measure in a situation where the prompt background radiation from a synchrotron is overwhelming.…”

Section: Neetmentioning

confidence: 99%

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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“…The multiplet (2+@ i&3/p) in ' Pb corresponding to(a) zeroth-order QMSM basis vector, (b) QMSM calculation in a one-dimensional basis, and (c) QMSM calculation within a 40dimensional basis. In (d) the experimental energies[6] are given. The numbers attached to the lines joining the main components of the physical vectors are the values of cosO.…”

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confidence: 99%

Three-quasiparticle states analysis in odd-mass lead isotopes

Sandulescu

Insolia

Blomqvist³

et al. 1993

Phys. Rev. C

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Three quasiparticle excitations for odd-even lead isotopes in the mass region 197~A~203 are calculated using a realistic two-body interaction. The analysis is performed in a correlated basis constructed by the tensor product of one times two quasiparticle states. Good agreement with available experimental data is found. The one phonon approximation of the weak coupling model is also analyzed.PACS number(sj: 21.60.n, 21.60.Jz, 27.80.+w

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Nuclear data sheets for A = 197

Cited by 22 publications

References 244 publications

Nuclear Excitation by Electron Transitions

Nuclear Excitation by Electron Transitions

Nuclear Transitions Induced by Synchrotron X-rays

Three-quasiparticle states analysis in odd-mass lead isotopes

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