Effect of nuclear magnetic distribution on thephoto production of longitudinally polarizedlepton-pairs in the field of Na2311 and Al2713 nuclei

In this work we treat the influence of the nuclear magnetic moment on the photo production of e - e+, ?- ?+, ?- ?+ i. e. l- l+, lepton pairs. We examine the process: ? + N(Ze, ?j ) ? N(Ze, ?j ) + l-(p- ) + l+(p+) of production of (l- l+) - pairs by cir?cularly polarized photons ?(p?) in the field of nucleus, N, having electric (coulomb) charge Ze, and magnetic dipole moment ?j, where j is the nuclear spin. Taking into account the longitudinal polarizations of the produced pairs, we calculate the differential cross-sections for the angular and energy distributions of the pair particles. We investigate the effect of the nuclear magnetic moment on the angular and energy distribution of the antilepton l+(e+,?+,?+), showing that the contribution the cross-section from the nuclear magnetic dipole moment rises considerably on going to high energies of incident photon and large emission angles of the pair particles. The results of calculations for Na2311 (j =1/2) and Al2713 - target nuclei, and for the three lepton pair types (e - e+, ?- ?+, ?- ?+) are presented graphically [1, 2].

Effect of nuclear magnetic distribution on thephoto production of longitudinally polarizedlepton-pairs in the field of Na2311 and Al2713 nuclei

In this work we treat the influence of the nuclear magnetic moment on the photo production of e - e+, ?- ?+, ?- ?+ i. e. l- l+, lepton pairs. We examine the process: ? + N(Ze, ?j ) ? N(Ze, ?j ) + l-(p- ) + l+(p+) of production of (l- l+) - pairs by cir?cularly polarized photons ?(p?) in the field of nucleus, N, having electric (coulomb) charge Ze, and magnetic dipole moment ?j, where j is the nuclear spin. Taking into account the longitudinal polarizations of the produced pairs, we calculate the differential cross-sections for the angular and energy distributions of the pair particles. We investigate the effect of the nuclear magnetic moment on the angular and energy distribution of the antilepton l+(e+,?+,?+), showing that the contribution the cross-section from the nuclear magnetic dipole moment rises considerably on going to high energies of incident photon and large emission angles of the pair particles. The results of calculations for Na2311 (j =1/2) and Al2713 - target nuclei, and for the three lepton pair types (e - e+, ?- ?+, ?- ?+) are presented graphically [1, 2].

Exploring the feasibility of magnetic moment measurements in the exotic 20C nucleus using LISE++ calculations

Nuclear magnetic moment measurements in neutron-rich isotopes require special techniques that have to be applied in the latest generation of RIB factories. Fragmentation reactions used in these labs can produce exotic species as secondary beams. Specialized fragment separators are used to optimize the production of secondary beams. In this work, a simulation code, LISE++, is used to explore the feasibility of a magnetic moment measurement in the exotic 20C nucleus, produced as a secondary beam in NSCL A1900 and RIKEN RIPS fragment separators, by optimizing the settings of operations in both.