3 research outputs found
Evolution of the -ray strength function in neodymium isotopes
The experimental gamma-ray strength functions (gamma-SFs) of 142,144-151Nd
have been studied for gamma-ray energies up to the neutron separation energy.
The results represent a unique set of gamma-SFs for an isotopic chain with
increasing nuclear deformation. The data reveal how the low-energy enhancement,
the scissors mode and the pygmy dipole resonance evolve with nuclear
deformation and mass number. The data indicate that the mechanisms behind the
low-energy enhancement and the scissors mode are decoupled from each other.Comment: 14 pages and 10 figure
New experimental constraint on the W()W cross section
In this work, we present new data on the W() cross
sections, utilizing a quasi-monochromatic photon beam produced at the NewSUBARU
synchrotron radiation facility. Further, we have extracted the nuclear level
density and -ray strength function of W from data on the
W()W reaction measured at the Oslo
Cyclotron Laboratory. Combining previous measurements on the
W() cross section with our new W()
and ()W data sets, we have deduced the
W -ray strength function in the range of MeV
and MeV.
Our data are used to extract the level density and -ray strength
functions needed as input to the nuclear-reaction code \textsf{TALYS},
providing an indirect, experimental constraint for the
W()W cross section and reaction rate. Compared to the
recommended Maxwellian-averaged cross section (MACS) in the KADoNiS-1.0 data
base, our results are on average lower for the relevant energy range keV, and we provide a smaller uncertainty for the MACS. The
theoretical values of Bao \textit{et al.} and the cross section experimentally
constrained on photoneutron data of Sonnabend \textit{et al.} are significantly
higher than our result. The lower value by Mohr \textit{et al.} is in very good
agreement with our deduced MACS. Our new results could have implications for
the -process and in particular the predicted -process production of
Os nuclei.Comment: 17 pages, 15 figures; to be submitted to Phys. Rev.
New experimental constraint on the 185W(n,γ)186W cross section
info:eu-repo/semantics/publishe