Benchmark on neutron capture extracted from $(d,p)$ reactions

Details Benchmark on neutron capture extracted from $(d,p)$ reactions Benchmark on neutron capture extracted from $(d,p)$ reactions

2008-05-30

arxiv.org/abs/0805.4780v1

Phys.Rev.C77:051601,2008

Physics

Nuclear Physics

Nuclear Theory

5 pg, 4 figs, Phys. Rev. C (rapid) in press

Scientific paper

10.1103/PhysRevC.77.051601

Direct neutron capture reactions play an important role in nuclear astrophysics and applied physics. Since for most unstable short-lived nuclei it is not possible to measure the $(n, \gamma)$ cross sections, $(d,p)$ reactions have been used as an alternative indirect tool. We analyze simultaneously $^{48}{\rm Ca}(d,p)^{49}{\rm Ca}$ at deuteron energies $2, 13, 19$ and 56 MeV and the thermal $(n,\gamma)$ reaction at 25 meV. We include results for the ground state and the first excited state of $^{49}$Ca. From the low-energy $(d,p)$ reaction, the neutron asymptotic normalization coefficient (ANC) is determined. Using this ANC, we extract the spectroscopic factor (SF) from the higher energy $(d,p)$ data and the $(n, \gamma)$ data. The SF obtained through the 56 MeV $(d,p)$ data are less accurate but consistent with those from the thermal capture. We show that to have a similar dependence on the single particle parameters as in the $(n, \gamma)$, the (d,p) reaction should be measured at 30 MeV.

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