Effective Photon Mass in Finite Nuclei

SUN Bao-Xi; LV Xiao-Fu; SHEN Peng-Nian; ZHAO En-Guang

Chinese Physics C> 2003, Vol. 27> Issue(4) : 337-340

Effective Photon Mass in Finite Nuclei

Institute of High Energy Physics, CAS, Beijing 100039, China2 Institute of Theoretical Physics, CAS, Beijing 100080, China3 Department of Physics, Sichuan University, Chengdu 610064, China4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China5 Department of Physics, Tsinghua University, Beijing 100084, China6 China Center of Advanced Science and Technology World Laboratory, Beijing 100080, China

Abstract
HTML
Reference
Related

PDF

Abstract：
The electromagnetic field in nuclear Fermi gas and nuclei has been studied. Because in the nuclear Fermi gas the expectation value of the electric charge density operator is not zero, different from that in vacuum, the U(1) local gauge symmetry of electric charge is spontaneously broken in the nuclear Fermi gas, and consequently, the photon gains an effective mass. Perturbation calculation of the photon self-energy shows that the effective mass of photon is about 5 42MeV in the symmetric nuclear Fermi gas at the saturation density ρ0=0.16fm^－3 and about 2.0MeV at the surface of ²³⁸U. Furthermore, it is concluded that it is just the two body decay of a massive photon that causes the discovery of sharp lines of electron positron pairs in low energy ²³⁸U+²³²Th heavy ion collisions experiments.

References

[1]

. Cowan T E et al.Phys.Rev.Lett.,1986,56:444 2. Cowan T E et al.In: Physics of Strong Fields.edited by W .Greiner.New York: Plenum Press,1987.111 3. Salabura P et al.Phys.Lett.,1990,B245:153 4. Ahmad I et al. Phys.Rev.Lett.,1995,75:2658 5. Griffin J J. nucl- th/9601034,1996,B27:2087 6. Griffin J J. nucl -th/9703006 7. Griffin J J. nucl -th/9703041 8. Griffin J J .nucl -th/9802044,The APEX /EPOS Quandary: The Way Out via Low Energy Studies. In: Gadioli Eed.Proc. 8th Int’l Conf. on Nuclear Reaction Mechanisms. Varenna, Italy:June9–14,1997,493—502 9. Serot B D ,Walecka J D . The Relativistic Nuclear Many body Problem. In: Negele J W ,Vogt E ed.Advances in Nuclear Physics,16.NewYork:Plenum Press.1986.1—327 10. Schaffner J et al.Ann.Phys.,1994,235:35 11. Ring P .Prog. Part.Nucl.Phys.,1996,37:193 12. Itzykson C ,Zuber J B .Quantum Field Theory.Mc Graw Hill Inc.,1980.519 13. Lurie D .Particles and Fields.Interscience Publishers,1968.282 14. deVries H et al. Atomic Data and Nuclear Data Tables,1987,36:495

Access

Get Citation

SUN Bao-Xi, LV Xiao-Fu, SHEN Peng-Nian and ZHAO En-Guang. Effective Photon Mass in Finite Nuclei[J]. Chinese Physics C, 2003, 27(4): 337-340.

SUN Bao-Xi, LV Xiao-Fu, SHEN Peng-Nian and ZHAO En-Guang. Effective Photon Mass in Finite Nuclei[J]. Chinese Physics C, 2003, 27(4): 337-340. shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2002-07-12
Revised: 1900-01-01

Article Metric

Article Views(5215)
PDF Downloads(500)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effective Photon Mass in Finite Nuclei

Corresponding author: SUN Bao-Xi,

Institute of High Energy Physics, CAS, Beijing 100039, China2 Institute of Theoretical Physics, CAS, Beijing 100080, China3 Department of Physics, Sichuan University, Chengdu 610064, China4 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China5 Department of Physics, Tsinghua University, Beijing 100084, China6 China Center of Advanced Science and Technology World Laboratory, Beijing 100080, China

Received Date: 2002-07-12
Accepted Date: 1900-01-01
Available Online: 2003-04-05

Abstract: The electromagnetic field in nuclear Fermi gas and nuclei has been studied. Because in the nuclear Fermi gas the expectation value of the electric charge density operator is not zero, different from that in vacuum, the U(1) local gauge symmetry of electric charge is spontaneously broken in the nuclear Fermi gas, and consequently, the photon gains an effective mass. Perturbation calculation of the photon self-energy shows that the effective mass of photon is about 5 42MeV in the symmetric nuclear Fermi gas at the saturation density ρ0=0.16fm^－3 and about 2.0MeV at the surface of ²³⁸U. Furthermore, it is concluded that it is just the two body decay of a massive photon that causes the discovery of sharp lines of electron positron pairs in low energy ²³⁸U+²³²Th heavy ion collisions experiments.