Comment on the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow /><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Nucleon-Nucleon Effective-Range Expansion Parameters

Noyes, H. Pierre; Lipinski, H. M.

doi:10.1103/physrevc.4.995

Cited by 51 publications

(46 citation statements)

References 35 publications

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“…The solid lines depict calculations where only the proton-proton FSI was taken into account, whereas the dashed lines present results where the overall enhancement was factorized into the corresponding pair interactions of the ppη system. In the left panel the enhancement factor accounting for the proton-proton FSI has been calculated as a square of the on-shell proton-proton scattering amplitude derived according to the modified Cini-Fubini-Stanghellini formula including Wong-Noyes Coulomb corrections [8,10,11], whereas in the right panel the inverse of the Jost function presented in references [9,12] was used. Though the simple phenomenological treatment -based on the factorization of the production amplitude into the constant primary production and the on-shell incoherent pairwise interaction among the exit particles -works astonishingly well in case of the total cross section energy dependence [8], it fails completely in the description of the differential cross section as can be inferred from figure 3(left).…”

Section: Resultsmentioning

confidence: 99%

EXPERIMENTAL STUDY OF THE Η-Meson INTERACTION WITH TWO NUCLEONS

Moskal

Adam

Budzanowski³

et al. 2003

Meson 2002

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By means of the COSY-11 detection system, using a stochastically cooled proton beam of the Cooler Synchrotron COSY and a hydrogen cluster target, we have performed a high statistics measurement of the pp → ppη reaction at an excess energy of Q = 15.5 MeV. The experiment was based on the four-momentum determination of both outgoing protons. This permits to identify pp → ppη events and to derive the complete kinematical information of the ηpp-system allowing for subsequent investigations of the ηp interaction. The observed spectrum of the invariant mass of the protonproton system deviates strongly from the phase-space distribution revealing the influence of the final-state-interaction among the outgoing particles or nontrivial features of the primary production mechanism.

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Section: Resultsmentioning

confidence: 99%

EXPERIMENTAL STUDY OF THE Η-Meson INTERACTION WITH TWO NUCLEONS

Moskal

Adam

Budzanowski³

et al. 2003

Meson 2002

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“…−3 . Especially at high energies the uncertainty in the determination of the detection efficiency is mainly given by application of different models for the proton-proton FSI [40,41,42,43,44]. To receive an η ′ meson angular distribution, the range of scattering angles in the center of mass system was divided into eight angular bins and missing mass spectra have been extracted for each bin.…”

Section: Methodsmentioning

confidence: 99%

$\delta$ -pairing forces and collective pairing vibrations

2004

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Abstract. The η ′ meson production in the reaction pp → ppη ′ has been studied at excess energies of Q = 26.5, 32.5 and 46.6 MeV using the internal beam facility COSY-11 at the cooler synchrotron COSY. The total cross sections as well as one angular distribution for the highest Q-value are presented. The excitation function of the near threshold data can be described by a pure s-wave phase space distribution with the inclusion of the proton-proton final state interaction and Coulomb effects. The obtained angular distribution of the η ′ mesons is also consistent with pure s-wave production.

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“…But this prediction fails, since ir gives about --17 fin for the nuclear scattering length, while it is known that the n -n scattering length is (Table I) close to --23.7 fm. Any quantitative theoretical explanation for the diserepancy between the predieted value of --17 fm and the observed value of --23.7 fm for anp still remains as elusive as ever [1]. It is known that the scattering length ann or anp is very sensitive to small corrections of the nucleon-nucleon interaction, but the effective range is quite insensitive.…”

Section: Introductionmentioning

confidence: 99%

Study of the neutron—neutron interaction from the n+d break-up process

Bouchez¹

1973

Acta Physica

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The resutts of the deuteron break-up d(n, nn) by 14 MeV neutrons, which show an n--n interaction in the final state, are analysed with the object of obtaining the n--n interaction parameters which cannot be obtained directly.The energy spectrum of the forward going protons in the inc0mplete experiments cannot easily gire the scattering length ann, for it is difficult to separate the effects of ann and of the two-body N--N potential. When the FADDEEV theory is not used, the incomplete experiments with three nucleons do not represent measnrements of ann, but must be considered as tests of final-state interaction theories, using ann ~ --17 fm asa parameter, By contrast, the shape of the n--n final state interaction peak in the complete experiments ought to gire ann more easily. The exact solution of the FADDEEV equations gives a shape which differs little (~ 109£ at Enn ~ 1 MeV) from that given by the simple MIGDAL--WATSON relation, and which varies then little with the two~body N--N interaction. The valnes ann ~ --17 fin obtained at Hamburg (M--W relation and without correction for momentum transfer dependence), and 1 ann I ~ 20 fin obtained at Grenoble (exact FADDEEV calculations, but with the YAMAGUCHI N--• potential) do not represent ah important disagreement.Finally, the magnitude of the n--n peak in the complete experiments depends noticeably on the choice of the N--N potential; the separable N--N potential of YAMAGUCHI ehosen for the exact calculations with the FADDEEV equations gives about two times measured value at Grenoble. The precise measurement of the magnitude of the n--n peak together with a better choice of the two-nucleon potential (hard core, tensor forces) for the solution of the FADDEEV equations, now seem necessary.

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Comment on theS01Nucleon-Nucleon Effective-Range Expansion Parameters

Cited by 51 publications

References 35 publications

EXPERIMENTAL STUDY OF THE Η-Meson INTERACTION WITH TWO NUCLEONS

EXPERIMENTAL STUDY OF THE Η-Meson INTERACTION WITH TWO NUCLEONS

$\delta$ -pairing forces and collective pairing vibrations

Study of the neutron—neutron interaction from the n+d break-up process

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