Fluctuations de la polarisation différentielle des particules émises dans les réactions nucléaires

Lambert, M.; Dumazet, G.

doi:10.1016/0029-5582(66)90349-x

Cited by 12 publications

(9 citation statements)

References 13 publications

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“…In this case the joint distribution of AP and cross section would differ from (19). It would result in a mismatch between experimentally determined correlation dependences and theoretically calculated ones which would be indicative of the presence of an intermediate structure in this reaction.…”

Section: Sc Of Ap and Cross Sectionmentioning

confidence: 84%

“…The last statement is the straightforward consequence of uncorrelation condition (14). For N=2 (19) leads to the result of [24]. With no direct processes ya=0 and in the limit yd~0 (19) is reduced to…”

Section: Rn(x Z) = Rn~ (X ) Rn~(z)mentioning

confidence: 89%

“…Employing (23) one can readily calculate the AP variance (25) 1 that is, with the effective number of independent channels increasing, the fluctuations of AP are being damped just as those of the cross section. Equation (19) suggests that KN(A,y ) represents a surface with a maximum in the vicinity of A~-A d, y_~l. The greater the contribution of direct processes into the reaction cross section, the sharper the maximum.…”

Section: Kn(a Y) = Ln(a ) Fno ) (22)mentioning

confidence: 99%

“…In deriving (19) it has been taken into account that the effective number of independent channels N corresponding to the total cross section is twice as great as those (N~ and N2) for the cross sections a and b. The last statement is the straightforward consequence of uncorrelation condition (14).…”

Section: Rn(x Z) = Rn~ (X ) Rn~(z)mentioning

confidence: 99%

“…Furthermore, for such reactions in the range of forward and backward angles the fluctuation single-scattering experiment with a polarized incident beam enables one to determine completely DI amplitude [18], whereas for the same purpose a triple-scattering experiment is required in the absence of CN contribution into the reaction cross section. There are recent works which deal with the examination of the analyzing power (AP) probability distribution and its moments [19][20][21][22] as well as the investigation of the statistical correlation (SC) between AP and the cross section [23,24] for the 1,/'2 +0--,0+1/2 spin structure reactions. Such correlation are also established for the reactions of 1 +0-+0+ 1 type [25].…”

Section: Introductionmentioning

confidence: 99%

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Analyzing power fluctuations in nuclear reactions

Kun

1985

Z Physik A

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The joint analysis of differential analyzing power (AP) and differential cross section in the nuclear reactions of 1/2+J1--+J2+J3 type in the region of strongly overlapping resonances are presented. Consideration is valid in the absence of the channel-channel compound nuclear correlations. The fluctuations of AP and cross section are proved to be statistically correlated, the greater the direct contribution to the reaction cross section the stronger this correlation. For the purely statistical reactions the correlation is absent. It is shown that the joint investigation of the AP and cross section fluctuations gives possibility to extract the direct reaction AP and the separate the direct and compound nucleus contributions into the reaction cross section. In particular it can be done by means of the statistical correlation (SC) analysis. Furthermore, the SC analysis may serve as a test for revealing the intermediate structure involved in the reaction. Finally, the joint study of differential AP and differential cross section may be used to determine the spins of nuclear levels and polarization of incident beam. The results are employed to separate the compound and direct contributions in the inelastic scattering of polarized protons on 2SSi. Comparison with experiment quantitatively supports the existence of the SC between the fluctuations of AP and cross section. Possible extension of the SC analysis to the case of the presence of channel-channel compound nuclear correlations are discussed.

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Section: Sc Of Ap and Cross Sectionmentioning

confidence: 84%

Section: Rn(x Z) = Rn~ (X ) Rn~(z)mentioning

confidence: 89%

Section: Kn(a Y) = Ln(a ) Fno ) (22)mentioning

confidence: 99%

Section: Rn(x Z) = Rn~ (X ) Rn~(z)mentioning

confidence: 99%