MANIFESTATION OF NUCLEAR CLUSTERIZATION IN COULOMB SUMS

  • A. Yu. Buki National Science Center “Kharkov Institute of Physics & Technology”1, Akademicheskaya St., Kharkov, 61108, Ukraine https://orcid.org/0000-0001-5569-3500
  • I. S. Timchenko National Science Center “Kharkov Institute of Physics & Technology”1, Akademicheskaya St., Kharkov, 61108, Ukraine https://orcid.org/0000-0003-2917-5026
DOI: https://doi.org/10.26565/2312-4334-2018-1-03
Keywords: Coulomb sum, lithium isotopes, light and medium nuclei, nuclear clusterization, cluster isolation parameter x

Abstract

The new experimental Coulomb sums values of 6Li and 7Li nuclei have been obtained at momentum transfers range q = 0.750¸ 1.000 fm-1 and q = 0.750¸ 1.125 fm-1, respectively, extending significantly the earlier reported momentum transfers range of Coulomb sums for these nuclei. The dependence of the 6Li and 7Li Coulomb sums on the momentum transferred is shown to differ substantially from same dependences for all the other investigated nuclei. It is suggested that the observed feature of the 6Li and 7Li Coulomb sums is related to a strong clusterization of these nuclei. The parameter qp corresponding to the value of the momentum transferred, at which the Coulomb sum ceases to grow and remains constant for larger momentum transfers, is introduced. The values of the parameter qp for the lithium isotopes nuclei were obtained (qp(7Li) = 1.20 ± 0.10fm-1 and qp(7Li) = 1.35 ± 0.10 fm-1), which are much lower than qp of 4He, 12C, 40Ca, 48Ca and 56Fe nuclei (qp » 2 fm-1). The graph represented the qp values of the nuclei as a function of the isolation parameter x, which characterizing the degree of nuclear clusterization, is constructed. The obtained graph shows the explicit proportionality of the qp dependence from the parameter x and predicts the qp value for the Coulomb sum of the 9Be nucleus not yet measured.

Downloads

Download data is not yet available.

References

1. de Forest T. Jr., Walecka J.D. Electron Scattering and Nuclear Structure // Ann. Phys. NY.  1966. - Vol.15. - No.57. - P. 1-109.

2. Aste A. Coulomb distortion effects in quasi-elastic (e,e’) scattering on heavy nuclei // Nucl. Phys. - 2008. - Vol.A806. - P. 191-215.

3. Buki A.Yu., Timchenko I.S., Shevchenko N.G., Nenko I.A. Coulomb sums of the 4Не nucleus at q = 0.88 to 1.25 fm-1 // Phys. Lett. – 2006. - Vol.B641. - Р. 156-158.

4. von Reden K.F., Alcorn C., Dytman S.A., et al. Quasielastic electron scattering and Coulomb sum rule in 4He // Phys. Rev. - 1990. - Vol.C41. - P. 1084-1094.

5. Zghiche A., Danelet J.F., Bernhheim M., et al. Longitudinal and transverse responses in quasi-elastic electron scattering from 208Pb and 4He // Nucl. Phys. - 1994. - Vol.A572. - P. 513-559.

6. Buki A.Yu., Nenko I.A., Shevchenko N.G., Efros V.D. Experimental determination of the Coulomb energy of the nucleus 6Li // Sov. J. Nucl. Phys. - 1977. - Vol.25. - P. 246247.

7. Buki A.Yu., Timchenko I.S., Shevchenko N.G. Saturation of Coulomb sum rules in the 6Li case // Eur. Phys. J. - 2012. - Vol.A48. - P. 17-22. DOI 10.1140/epja/i2012-12017-6.

8. Buki A.Yu., Shevchenko N.G., Timchenko I.S. Coulomb sums for 7Li nucleus at 3-momentum transfers q = 1.250 - 1.625 fm-1 // PAST. - 2009. - Vol.3(51). - P. 38-42.

9. Afanasiev N.G., Goldshtane V.A., Savitskiy G.A., et. al. Magnetic spectrometer for particles with momentum up to 400 MeV/s // I.E.T. - 1966. - Vol.5. - P. 44-50. (in Russian)

10. Polishchuk V.N., Shevchenko N.G., Afanas’ev N.G., et al. Multi-channel counter for registration high-energy electrons: Preprint KIPT 72-40. - 1972. – Kharkov. – 20p. (in Russian)

11. Buki A.Yu., Shevchenko N.G., Nenko I.A., et al. Moments of the response functions of the 2H nucleus at q = 1.05 fm-1 // Phys. of At. Nucl. – 2002. – Vol.65(5). – P. 787–796.

12. Buki A.Yu., Shevchenko N.G., Polishchuk V.N., Khomich А.А. Transverse moment of the 4He response function at transfered momentum 0.75 ÷ 1.5 fm-1 // Phys. of At. Nucl. - 1995. - Vol.58(8). - P. 1353-1361.

13. Buki A.Yu. Coulomb sum of 12C nucleus at transferred momentum 0.95 ÷ 1.35 fm-1 // The Journal of Kharkiv National University. Series: “Nuclei, Particles, Fields”. - 2010. - Vol. 48. - P. 37-40. (in Russian)

14. Űberall H. Electron Scattering From Complex Nuclei. Part A. - Academic Press: New York and London, 1971. (look page 368)

15. Krumova G.Z., Tomasi-Gustafsson E., Antonov A.N. Charge form factor and cluster structure of the 6Li nucleus // Open Phys. - 2008. - Vol.6. - P. 491–497. DOI: 10.2478/s11534-008-0091-4, arXiv:0709.1016v1 [nucl-th].
Published
2018-04-03
Cited
How to Cite
Buki, A. Y., & Timchenko, I. S. (2018). MANIFESTATION OF NUCLEAR CLUSTERIZATION IN COULOMB SUMS. East European Journal of Physics, 5(1), 36-40. https://doi.org/10.26565/2312-4334-2018-1-03
Issue
Vol. 5 No. 1 (2018): East European Journal of Physics
Section
Original Papers

Authors who publish with this journal agree to the following terms:

    • Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
    • Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
    • Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).