Inclusive photoproton spectra from 12C at intermediate energies

Deuteron distribution in nuclei and the Levinger’s factor

“…[25], is ∼ 15% smaller than our theoretical value. In I, the surface contribution to L(A) has been estimated exploiting the calculated enhancement factor of the electric dipole sum rule for finite nuclei, K, [38], obtained using CBF theory and LDA.…”

“…By using the same parameterization as in I for the surface term, we get: as extracted [25,26] from the available experimental data on photoreactions. The computed Levinger's factors are almost A-independent for heavy nuclei (A > 100), and result to be ∼ 15% larger than L Lev (A) and ∼ 25% smaller than L Laget (A).…”

“…The sum over X yields the total number of QD pairs in the nucleus, P D , thus allowing for a direct estimate of the Levinger's factor, L, to be compared to the empirical values resulting from phenomenological analyses [25,26] of photoreaction data [27,28].…”

A high efficiency photon veto for the Light Dark Matter eXperiment

“…These reactions include single forward neutrons and neutral kaons (which drive the depth needed for the HCal), moderate-angle neutron pairs (which drive the width needed for the back HCal), and single forward charged kaons and pions (which drive the depth segmentation and MIP rejection capabilities of the ECal). Compared to data (including [23][24][25][26][27][28][29][30][31][32][33][34][35]), the single-and di-neutron reactions, as well as backscattered hadrons in the so-called "cumulative" region, were found to be significantly overpopulated by the default Bertini model; by contrast, single-pion and single-kaon final states were underpopulated. The origin of each discrepancy was identified and corrections implemented, many of which have also been incorporated in subsequent official Geant4 versions.…”

“…A particular focus lies on few-body background processes that are limiting for LDMX. The rates and kinematics of these few-body reactions on low-Z nuclei are well-measured [23][24][25][26][27][28][29][30][31][32][33][34][35], allowing a reliable estimate of the required veto efficiency.…”