Multipion correlations in high energy collisions

Zhang, Q. H.

doi:10.1103/physrevc.58.r18

Cited by 11 publications

(15 citation statements)

References 38 publications

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“…The way in which multiboson symmetrization effects manifest themselves in Bose-Einstein interferometry differs for ensembles of events with fixed multiplicity [1,6,8] and for multiplicity-averaged ensembles [2,3,6,7,10]. In this section we provide the relevant formulae for both cases.…”

Section: Multiparticle Distributionsmentioning

confidence: 97%

“…In this section we provide the relevant formulae for both cases. In the multiplicity-averaged case (Section III B) we allow for arbitrary pion multiplicity distributions; the previously studied specific case of Poisson statistics in the dilute gas limit [4,6,7,10,13] is shortly reviewed in Section III C. In Section III D we define and differentiate between the correlation strength and the incoherence parameter and point out that all sources studied here are fully chaotic even if the correlation strength differs from 1.…”

Section: Multiparticle Distributionsmentioning

confidence: 98%

“…These expressions simplify considerably [3,6] if the following special multiplicity distribution is assumed:p…”

Section: "Poisson Limit"mentioning

confidence: 99%

“…In both cases, one prescribes an "input" multiplicity distribution (which refers to the infinite phase-space volume limit where multiboson symmetrization effects can be neglected), whereas the actually measured multiplicity distribution is a complicated function of the average phase-space density of the source. On the other hand, residual correlations do arise, in particular, for events with fixed multiplicity; there they lead to strong effects in sources with large phase-space density which were noted before [1,6,8,13] but whose origin has up to now not been fully clarified.…”

Section: Introductionmentioning

confidence: 95%

“…We know only two multiplicity distributions for which they do not arise, the "Poisson limit" discussed in Section III C [4,6,7,10,13] and the "covariant current formalism" discussed in Appendix A [19,20]. In both cases, one prescribes an "input" multiplicity distribution (which refers to the infinite phase-space volume limit where multiboson symmetrization effects can be neglected), whereas the actually measured multiplicity distribution is a complicated function of the average phase-space density of the source.…”

Section: Introductionmentioning

confidence: 99%

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Multiboson Effects in Bose–Einstein Interferometry and the Multiplicity Distribution

2001

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Multiboson symmetrization effects on two-particle Bose-Einstein interferometry are studied for ensembles with arbitrary multiplicity distributions. This generalizes the previously studied case of a Poissonian input multiplicity distribution. In the general case we find interesting residual correlations which require a modified framework for extracting information on the source geometry from two-particle correlation measurements. In sources with high phase-space densities, multiboson effects modify the Hanbury Brown-Twiss (HBT) radius parameters and simultaneously generate strong residual correlations. We clarify their effect on the correlation strength (intercept parameter) and thus explain a variety of previously reported puzzling multiboson symmetrization phenomena. Using a class of analytically solvable Gaussian source models, with and without space-momentum correlations, we present a comprehensive overview of multiboson symmetrization effects on particle interferometry. For event ensembles of (approximately) fixed multiplicity, the residual correlations lead to a minimum in the correlation function at nonzero relative momentum, which can be practically exploited to search, in a model-independent way, for multiboson symmetrization effects in high-energy heavy-ion experiments. C

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Section: Multiparticle Distributionsmentioning

confidence: 97%

Section: Multiparticle Distributionsmentioning

confidence: 98%

“…These expressions simplify considerably [3,6] if the following special multiplicity distribution is assumed:p…”

Section: "Poisson Limit"mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Multiboson Effects in Bose–Einstein Interferometry and the Multiplicity Distribution

2001

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New neutron-rich isotope production in 154 Sm+ 160 Gd

Wang¹,

Guo²

2016

Physics Letters B

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Deep inelastic scattering in 154 Sm+ 160 Gd at energies above the Bass barrier is for the first time investigated with two different microscopic dynamics approaches: improved quantum molecular dynamics (ImQMD) model and time dependent Hartree-Fock (TDHF) theory. No fusion is observed from both models. The capture pocket disappears for this reaction due to strong Coulomb repulsion and the contact time of the di-nuclear system formed in head-on collisions is about 700 fm/c at an incident energy of 440 MeV. The isotope distribution of fragments in the deep inelastic scattering process is predicted with the simulations of the latest ImQMD-v2.2 model together with a statistical code (GEMINI) for describing the secondary decay of fragments. More than 40 extremely neutronrich unmeasured nuclei with 58 ≤ Z ≤ 76 are observed and the production cross sections are at the order of µb to mb. The multi-nucleon transfer reaction of Sm+Gd could be an alternative way to synthesize new neutron-rich lanthanides which are difficult to be produced with traditional fusion reactions or fission of actinides. * Electronic address: wangning@gxnu.edu.cn † Electronic address: luguo@ucas.ac.cn 65 −59.33 68 105 975 −53.77 62 100 31 −54.52 68 106 549 −52.31

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Multiboson effects and the normalization of the two-pion correlation function

1998

Self Cite

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The two-pion correlation function can be defined as a ratio of either the measured momentum distributions or the normalized momentum space probabilities. We show that the first alternative avoids certain ambiguities since then the normalization of the two-pion correlator contains important information on the multiplicity distribution of the event ensemble which is lost in the second alternative. We illustrate this explicitly for specific classes of event ensembles.PACS numbers: 25.75.Gz, 25.70.Pq.

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Multipion correlations in high energy collisions

Cited by 11 publications

References 38 publications

Multiboson Effects in Bose–Einstein Interferometry and the Multiplicity Distribution

Multiboson Effects in Bose–Einstein Interferometry and the Multiplicity Distribution

New neutron-rich isotope production in 154 Sm+ 160 Gd

Multiboson effects and the normalization of the two-pion correlation function

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