Get Advances in Nuclear Physics: Volume 6 PDF

By André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)

ISBN-10: 1461590418

ISBN-13: 9781461590415

ISBN-10: 1461590434

ISBN-13: 9781461590439

In the current quantity and within the previous one we now have stretched our common development of reports by way of together with articles of extra significant proportions than any we have now released earlier than. in this case every one of those vol­ umes includes simply 3 evaluation articles. From the start of this sequence it's been our goal, as editors, to accomplish version within the scope, sort, and size of person articles adequate to compare the wishes of the person subject, instead of to restrain the authors inside inflexible limits. We suppose that the 2 significant articles of Vols. five and six are completely justified and don't repre­ despatched pointless exuberance at the a part of the authors. the item by way of Michaudon on fission is the 1st complete account of the advancements during this topic, that have put it within the heart of the level of nuclear physics in the past few years. the invention of fission isomerism and its dramatic manifestations within the intermediate constitution of the neutron go sections for fissionable isotopes are one of the so much im­ portant and fascinating occasions to ensue in nuclear physics. those occasions got here as a shock, and reaffirmed that the power of nuclear physics lies within the mix of inventive experiments with basic ideas.

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28 for 46 resonances (or groups) analyzed below 50 eV. ,V j~l 0 0 '\ x 0 II ). 4 , ~ . K. 2 0 1 Fig. 28. Pseudohistogram Y(x) [Eq. 50)1 showing the frequency distribution of the W(OO)/W(90 0 ) anisotropy data for 235U neutron resonances (or groups) analyzed below 50 eV. The plot is a solid line when the circles are too close to each other. Calculated values of x = W(O°)/W(900) corresponding to various possible J and K values are indicated. The total area under the diagram is equal to 46 units [after J.

In this group, a few resonances are so broad that their spin could not be measured. From their high value of R and their large value of r j , one can deduce that these broad resonances have In = 0+, and this is confirmed by multilevel analysis of the cross sections (DBM 70). ~ w ~ ~ w Fig. 23. The ratio R (multiplied by 102 ) of the yield of 1l5Cd relative to that of 99Mo produced in fission induced by slow neutrons in 23·PU, as measured by G. A. Cowan at neutron resonances (Cow+ 66), is plotted as a function of resonance energy.

Several compilations of J values, as obtained by different methods, have been made (Mic 68a, Mil 69). In Table I we give an updated version of this compilation which includes some very recent spin determinations. One must point out that the indirect methods used in most cases lead to rather ambiguous results. 08 (2) 3 3 4 3 3 4 4 3 3 4 (3) X X (4) X (5) (6) (7) X (8) X (9) Number J E. A. Cowan M. Asghar H. Weigmann S. Weinstein F. Poortmans (preference of (MM 65) (WRB69) (Poo+ 70) (Cow+ 70) (AMP 68) {WRW 69) determinations of majority) (I) Energy of the resonance (eV) 48 24 61 78 40 26 5 82 28 12 (10) r J (meV) (Mic+ 65, BDM 71) The resonance energy is given in Column 1, the number of spin determinations in Column 2, while the spin value, as prefered by the majority, is given in Column 3.

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Advances in Nuclear Physics: Volume 6 by André Michaudon (auth.), Michel Baranger, Erich Vogt (eds.)


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