Galactic production of 138 La: Impact of 138,139 La statistical properties

La137,138,139(n,γ) cross sections constrained with statistical decay properties of Kheswa1, Wiedeking2, Brown3 et al. 2017Phys. Rev. CSelf Cite

“…II for the 137 La(n, γ), 138 La(n, γ) and 139 La(n, γ) reactions. The present MACS for 137 La(n, γ) and 138 La(n, γ) are lower than those that were reported in [23] by up to a factor of 2. This is due the newly determined γSFs that are correspondingly lower than the previously at E γ < 5 MeV due to the different normalization parameters.…”

“…In the case of 138 La there is no D 0 measurements from (n, γ) resonance experiments due to the unavailability of 137 La target material. Hence, we used the estimated value which was taken from our previous work [23]. Similarly the experimental average radiative width Γ γ (S n , J T , π T ) , used for the normalization, was The goodness-of-fit between first-generation matrices for 140 La.…”

“…9) were computed. The statistical uncertainties of the experimental NLDs and γSFs have been modified to include uncertainties in D 0 and Γ γ (S n , J T , π T ) , as discussed previously [23]. These modifications to the uncertainties resulted in up to 69% and 34% uncertainties in the γSFs and NLDs, respectively.…”

“…The 138,139 La experimental results have already been used to investigate the synthesis of 138 La in p-process environments [23] and were able to reduce the uncertainties of its production significantly. The findings do not favour the 138 La production by photodisintegration processes, but rather the theory that 138 La is produced through neutrino-induced reactions [24,25], with the ν e -capture on 138 Ba as the largest contributor [26,27].…”

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the Campo1, Garrote2, Eriksen3 et al. 2016Phys. Rev. CSelf Cite

“…One of the most surprising features observed in the γ -strength function is the increased probability of γ decay with γ energies below 2-4 MeV, first seen in 56,57 Fe in 2004 [11]. Since then, this low-energy enhancement or upbend has been measured for several nuclei from Sc to Sm [11][12][13][14][15][16][17][18][19] and confirmed with an independent method for 95 Mo [20]. The physical mechanisms underlying this enhancement are still not clarified.…”