[en] We present a study of the 4He charge distribution based on realistic nucleonic wave functions and incorporation of quark substructure. Any central depression of the proton point density seen in modern four-body calculations is too small by itself to lead to a correct description of the charge distribution of 4He if folded with a fixed proton size parameter, as is usually done. We utilize six-quark structures calculated in the chromodielectric model for N-N interactions to find a "swelling" of the proton size as the inter-nucleon distance decreases. This swelling is a result of the short-range dynamics in the N-N system. Using the independent pair approximation, the corresponding charge distribution of the proton is folded with the two-nucleon distribution generated from Green's function Monte Carlo calculations of the 4He nucleonic wave function. We obtain a reasonably good fit to the experimental charge distribution of 4He. Meson-exchange currents have not been included.
Disciplines :
Physics
Author, co-author :
Wilets, Lawrence; University of Washington - UW > Physics
Alberg, Mary; University of Washington - UW > Physics
Pepin, Stéphane; Université de Liège - ULiège > Physique
Stancu, Floarea ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Carlson, J; Los Alamos National Laboratory
Koepf, Werner; Ohio State University > Physics
Language :
English
Title :
Quark substructure approach to 4He charge distribution
Publication date :
July 1997
Journal title :
Physical Review. C, Nuclear Physics
ISSN :
0556-2813
eISSN :
1089-490X
Publisher :
American Physical Society, United States - Maryland
J.S. McCarthy, I. Sick, and R.R. Whitney, Phys. Rev. C 15, 1396 (1977)
I. Sick, in Few Body Systems and Nuclear Forces II, Lecture Notes in Physics Vol. 87, edited by H. Zingl, M. Haftel, and H. Zankel (Springer, Berlin, 1978), p. 236.
J.L. Friar, B.F. Gibson, E.L. Tomusiak, and G.L. Payne, Phys. Rev. C 24, 665 (1981)
R.B. Wiringa, Phys. Rev. C 43, 1585 (1991)
J. Carlson, Nucl. Phys. A522, 185c (1991)
R. Schiavilla and D.O. Riska, Phys. Lett. B 244, 373 (1990)
L.S. Kisslinger, W.-H. Ma, and P. Hoodbhoy, Nucl. Phys. A459, 645 (1986)
W.-H. Ma and L. S. Kisslinger, A531, 493 (1991)
W.-H. Ma, Q. Wu, and L.S. Kisslinger, A560, 997 (1993).
H. Pirner and J.P. Vary, Phys. Rev. Lett. 46, 1376 (1981). PRLTAO
W. Koepf, L. Wilets, S. Pepin, and Fl. Stancu, Phys. Rev. C 50, 614 (1994)
W. Koepf and L. Wilets, Phys. Rev. C 51, 3445 (1995)
S. Pepin, Fl. Stancu, W. Koepf, and L. Wilets, Phys. Rev. C 53, 1368 (1996)
L. Wilets, Nontopological Solitons (World Scientific, Singapore, 1989).
R. Blankenbecler and S. Brodsky, Phys. Rev. D 10, 2973 (1974)
G. Farrar and D. Jackson, Phys. Rev. Lett. 35, 1416 (1975)
A. Vainstein and V. Zakharov, Phys. Lett. 72B, 368 (1978)
I.E. Lagaris and V.R. Pandharipande, Nucl. Phys. A351, 331 (1981)
J. Carlson, Phys. Rev. C 38, 1879 (1988)
J. Carlson and R. Schiavilla, Phys. Rev. Lett. 68, 3682 (1992)