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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 567-577 
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto La funzione di distribuzione a due corpi per fluidi bosonici e fermionici è stata calcolata risolvendo delle equazioni integrali approssimate, ottenute da una conveniente interpolazione tra le tecniche HNC e PY. Le equazioni contengono un parametro libero che è fissato soddisfacendo una condizione di consistenza. I risultati ottenuti per4He e3He liquidi migliorano quelli di HNC e PY e risultano in buon accordo con i risultati ricavati con tecniche di Montecarlo.
    Abstract: Резюме Приближенные интегральные уравнения, выведенные с помощью интерполяции между HNC и PY подходами, используются для вычисления функции распределения пар для квантовых Бозе—и Ферми-жидкостей. Уравнения содержат свободный параметр, который определяется таким образом, что выполняется условие совместимости. Результаты, полученные для жидких4He и3He улучшают результаты вычислений на основе PY и HNC уравнений и согласуются с результатами по методу Монте-Карло.
    Notes: Summary Approximate integral equations, derived by interpolating between HNC and PY approaches, have been used to calculate the pair distribution function for quantum Bose and Fermi fluids. The equations contain a free parameter wich is determined in such a way that a consistency condition is satisfied. The results obtained for liquid4He and3He improve upon the PY and HNC equations and are in good agreement with the Monte Carlo results.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 615-626 
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Nel presente lavoro si ricavano delle equazioni integrali per il calcolo della funzione di distribuzione a due corpi per sistemi classici e quantistici. Il procedimento adottato interpola le approssimazioni HNC e PY attraverso una funzione opportunamente derivata e contenente un parametro fissato mediante una condizione di consistenza. Il metodo proposto è semplice e richiede un lavoro numerico contenuto; le funzioni di distribuzione e le energie per particella calcolate per4He e3He liquidi risultano assai accurate per tutte le densità considerate.
    Abstract: Резюоме Выводятся интегральные уравнения, осуществляюще интерполяцию между HNC и PY приближениями, для вычисления парной функции распределения. Интерплляционная процедура основана на соответствующим образом выбранной функции, содержащей параметр, который фиксируется таким образом, чтобы удовлетворить условию непротиворечивости. Предложенная техника является простой и требует ограниченной вычислительной работы: функции распределения и знергия на одну частицу в жидких3He и4He, вычисленные с помощью предложенного метода, приводят к очень точным результатам для всех рассмотренных значений плотности.
    Notes: Summary Integral equations interpolating between the HNC and PY approximations are derived to calculate the pair distribution function. The interpolation procedure is based on a conveniently chosen function containing a parameter which is fixed so as to satisfy a consistency condition. The technique is simple and it requires limited computational work: the distribution functions and the energy per particle of liquid3He and4He furnished by the method result very accurate for all the density values considered.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 561-581 
    ISSN: 0392-6737
    Keywords: Fermi flluids: liquid helium-3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto In due precedenti lavori è stata sviluppata una tecnica di interpolazione tra le approssimazioni (F)HNC e (F)PY per tenere conto dei cosiddetti contributi elementari nel calcolo delle proprietà dei fluidi quantistici a temperatura zero e descritti da funzioni d’onda con fattori di correlazione a corto raggio. Nel presente lavoro il metodo è esteso, per sistemi sia bosonici che fermionici, al caso in cui la funzione radiale di distribuzione contenga una coda con andamentor −4. Sono presentati i risultati ottenuti per l’energia per particella e la distribuzione di quantità di moto dell’4He liquido, dell’idrogeno polarizzato e dell’3He liquido, in corrispondenza a funzioni d’onda variazionali contenenti solo correlazioni di coppia.
    Abstract: Резюме В двух предыдущих работах был предложен метод интерполяции между (F)HNC и (F)PY подходами. В этих работах рассматривались свойства квантовых жидкостей при нулевой температуре, которые описываются волновыми функциями с короткодействующими корреляциями. В данной работе, для Бозеи Ферми-систем, предложенная тенхика обобщается на случай, когда двух-частичная радиальная функция распределения содержит длиннодействующий хвост, который спадает какr −4. Приводятся результаты для энергии на одну частицу и импульсное распределение для жидкого4He, поляризованного водорода и3H, причем соответствующие вариационные волновые функции содержат только двух-частичные корреляции.
    Notes: Summary A method for interpolating between the (F)HNC and (F)PY approaches in order to take into account elementary contributions has been presented in two preceding papers concerned with the properties of zero-temperature quantum fluids, described by short-range correlated wave functions. In the present paper, both for Bose and for Fermi systems, the technique is extended to the case in which the two-body radial distribution function contains a long-range tail, going asr −4. The results obtained for the energy per particle and momentum distribution of liquid4He, polarized hydrogen and3He are presented in correspondence to variational wave functions containing only two-particle correlations.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 469-485 
    ISSN: 0392-6737
    Keywords: Fermi fluids ; liquid helium-3 ; Normal phase ; Structure of simple liquids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The momentum distributionn(k) and the one-body density matrix ρ1(r,r' have been calculated in normal liquid3He atT=0. A variational wave function containing two-, three-body and backflow correlations has been used. The Fermi hypernetted chain technique has been employed and the elementary diagrams have been evaluated by the scaling approximation. The present estimate ofn(k) is in good agreement with the Monte Carlo data obtained with similar wave functions.n(k) and the discontinuityZ ofn(k) at the Fermi surface have been computed at several values of the density. The density dependence of the effective massm * has been found to be mainly due to that ofZ.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 549 (1992), S. 439-460 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters B 323 (1994), S. 267-272 
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 550 (1992), S. 201-222 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 473 (1987), S. 290-316 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 435 (1985), S. 448-460 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 568 (1994), S. 73-89 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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