Electromagnetic processes in a χEFT framework

S. Pastore; R. Schiavilla; M. Viviani

doi:10.1088/1674-1137/34/9/044

Chinese Physics C> 2010, Vol. 34> Issue(9) : 1368-1371 DOI: 10.1088/1674-1137/34/9/044

Electromagnetic processes in a χEFT framework

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Abstract：
Recently, we have derived a two--nucleon potential and consistent nuclear electromagnetic currents in chiral effective field theory with pions and nucleons as explicit degrees of freedom. The calculation of the currents has been carried out to include N³LO corrections, consisting of two--pion exchange and contact contributions. The latter involve unknown low-energy constants (LECs), some of which have been fixed by fitting the np S- and P-wave phase shifts up to 100 MeV lab energies. The remaining LECs entering the current operator are determined so as to reproduce the experimental deuteron and trinucleon magnetic moments, as well as the np cross section. This electromagnetic current operator is utilized to study the nd and n³He radiative captures at thermal neutron energies. Here we discuss our results stressing on the important role played by the LECs in reproducing the experimental data.

References

[1]

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S. Pastore, R. Schiavilla and M. Viviani. Electromagnetic processes in a χEFT framework[J]. Chinese Physics C, 2010, 34(9): 1368-1371. doi: 10.1088/1674-1137/34/9/044

S. Pastore, R. Schiavilla and M. Viviani. Electromagnetic processes in a χEFT framework[J]. Chinese Physics C, 2010, 34(9): 1368-1371. doi: 10.1088/1674-1137/34/9/044 shu

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Received: 2010-02-09
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Electromagnetic processes in a χEFT framework

Received Date: 2010-02-09

Accepted Date: 1900-01-01

Available Online: 2010-09-05

Abstract:

Recently, we have derived a two--nucleon potential and consistent nuclear electromagnetic currents in chiral effective field theory with pions and nucleons as explicit degrees of freedom. The calculation of the currents has been carried out to include N³LO corrections, consisting of two--pion exchange and contact contributions. The latter involve unknown low-energy constants (LECs), some of which have been fixed by fitting the np S- and P-wave phase shifts up to 100 MeV lab energies. The remaining LECs entering the current operator are determined so as to reproduce the experimental deuteron and trinucleon magnetic moments, as well as the np cross section. This electromagnetic current operator is utilized to study the nd and n³He radiative captures at thermal neutron energies. Here we discuss our results stressing on the important role played by the LECs in reproducing the experimental data.

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Electromagnetic processes in a χEFT framework

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