Analog resonance spectroscopy and compound nuclear enhancement at analog resonances in 87Y

King, H.T.; Slater, D. C.

doi:10.1016/0375-9474(77)90546-2

Cited by 18 publications

(3 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The compound nucleus lives so long that in the C E events inand outgoing atomic amplitudes add incoherently (Anholt er al 1982) and do not contribute to the interference pattern described by (3.6). In the related system p + '%r compound elastic scattering was shown to be negligible at both 8 = 90" and 8 = 155" (Chemin et al 1983), in agreement with nuclear data by King and Slater (1977).…”

Section: Broadening Of the Elastic Proton Scattering Resonance L3n(15...supporting

confidence: 85%

Interplay of nuclear and atomic physics in ion-atom collisions

Heinz¹

1987

Rep. Prog. Phys.

View full text Add to dashboard Cite

The interplay between atomic and nuclear interactions in collisions between light and heavy ions is studied. The general theoretical description is outlined and analysed in a number of different limits (non-relativistic and relativistic electrons, semiclassical approximation, DWBA, fully quantal description) that have been used in practical applications. The two most important physical mechanisms for generating atomicnuclear interference, i.e. energy conservation and the introduction of additional phase shifts by nuclear reactions, are extracted and their universality in all scattering systems is stressed. The need for choosing different sets of basis states in light and heavy, symmetric and asymmetric systems, in order to achieve an economical theoretical description, is discussed in some detail. The resulting typical coupling matrix elements are analysed for their relative importance in atomic and nuclear excitations. The description of nuclear influence on atomic excitations in terms of a classical time delay caused by nuclear reactions is reviewed and its relationship to the underlying quantal character of the nuclear reaction is extracted.An experimental chapter reviews the existing data on nuclear-atomic interference. A large section covers proton-induced reactions (through isobaric analogue resonances or compound-nucleus formation) and their effects on bremsstrahlung spectra, K-hole probabilities, x-ray emission and electron capture. Inverse processes, where excitations within the electron shell modify the nuclear scattering, are also described. That structures in the atomic spectra can be consistently used to extract nuclear reaction times or average nuclear resonance widths is demonstrated for compound-nucleus formation in light-ion scattering and later applied to heavy-ion reactions. The experimental use of K-hole, 8-electron and positron production in heavy-ion reactions as an atomic clock for nuclear delay times is discussed; it is shown to give consistent results even in a region where direct determination of these times from measurement of nuclear reaction products is so far impossible.A prominent place in this review is reserved for spontaneous positron emission in supercritical heavy-ion collisions (Z,,, B 173); line structures predicted in the positron energy spectra may provide the most sensitive mechanism to isolate even very small fractions of the nuclear cross section proceeding through strongly delayed resonances or reaction channels. Attempts to use this idea to interpret the recently discovered

show abstract

Section: Broadening Of the Elastic Proton Scattering Resonance L3n(15...supporting

confidence: 85%

Interplay of nuclear and atomic physics in ion-atom collisions

Heinz¹

1987

Rep. Prog. Phys.

View full text Add to dashboard Cite

show abstract

“…By virtue of the fact that (ffl)=0, we have for arbitrary A In IAR reactions, c;<,, will not necessarily be independent of E between E and E-U~-a. Theory [18,22,23] suggests that …”

Section: Isobaric Analog Resonancesmentioning

confidence: 99%

United-atomK x-ray production in nuclear reactions

Anholt

1982

Z Physik A

View full text Add to dashboard Cite

The probability for compound-nucleus x-ray production P,.,,,~ in atomic collisions where long-lived compound nuclei are formed is calculated using the second-order distorted wave Born Approximation. The results are compared with a semi-classical formula which relates P,.nx to the product of the K-vacancy decay rate F K, the compoundnucleus lifetime r, the probability of creating a K vacancy on the incoming part of the collision, and the fraction of reaction products li.,, that have formed a compound nucleus. For an isolated resonance, we find that r is just the inverse of the resonance width F, and for the compound-nucleus reactions involving many unresolved resonances, r is the inverse of the Erison correlation width F c. For isobaric analog resonances Q is expected to be larger on resonance than off resonance. The fraction of reaction products/~,, is given in terms of squares of complex reaction amplitudes.

show abstract

“…The requirement of maximizing the CN cross section in the channels coupled through the isobaric analogue resonance is met by nuclei in the vicinity of mass 90, for which comparatively few neutron channels are open. Several experimental groups have measured the angular distribu tion, analyzing power, spin-flip probability, spin-flip asymmetry, and cross-correlation functions fo r the outgoing protons (Kretschmer & Graw 1971, Albrecht et al 1973, Graw et a1 1974, Blanke et a1 1975, Davis et al 1975, Clement et al 1977, Haynes et al 1976, Feist et al 1977, King & Slater 1977. Typically, the cross section is written in the form 2.3, and two different fits to the data are performed: one is based on the expression for <a;b N > where DI are neglected, and one is based on Equation 6.3.…”

Section: Intermediate Structurementioning

confidence: 99%

Untitled

1979

Annu. Rev. Nucl. Part. Sci.

View full text Add to dashboard Cite

Analog resonance spectroscopy and compound nuclear enhancement at analog resonances in 87Y

Cited by 18 publications

References 16 publications

Interplay of nuclear and atomic physics in ion-atom collisions

Interplay of nuclear and atomic physics in ion-atom collisions

United-atomK x-ray production in nuclear reactions

Untitled

Contact Info

Product

Resources

About