For interpreting fusion rate measurements in present fusion experiments and predicting the fusion performance of future devices or of d-t experiments in present devices, it is important to know the fusion cross-sections as precisely as possible. Usually, it is not measured data that are used, but parametrizations of the cross-section as a function of the ion energy and parametrizations of the Maxwellian reactivity as a function of the ion-temperature. Since the publication of the parametrizations now in use, new measurements have been made and evaluations of the measured data have been improved by applying R-matrix theory. The authors show that the old parametrizations no longer adequately represent the experimental data and present new parametrizations based on R-matrix calculations for fusion cross-sections and Maxwellian reactivities for the reactions D(d,n)3He, D(d,p)T, T(d,n)4He and 3He(d,p)4He

https://iopscience.iop.org/article/10.1088/0029-5515/32/4/I07/pdf

Improved formulas for fusion cross-sections and thermal reactivities

Energy levels of A = 21−44 nuclei (V)

Resonating-group method for nuclear many-body problems

The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear $\beta$ decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available $\beta$-decay data is performed incorporating, for the first time in a consistent way, superallowed $0^+\to 0^+$ transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left- or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to $V_{ud}$ and $g_A$ respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is $C_A/C_V = -1.27510(66)$. The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low- and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

/pdf/new-physics-searches-in-nuclear-and-neutron-beta-decay-3a6vrajspc.pdf

New physics searches in nuclear and neutron $\beta$ decay

https://cds.cern.ch/record/2310343/files/1803.08732.pdf

H. Genz

Papers

Operation results of the Dynamitron Tandem at Bochum

In-beam measurement of the E0 transition probability for the 0+1-0+ transition in 100Mo and 70Zn

Half-life, endpoint energy, ƒt value and shape factor in the β− decay of 20F

Determination of half-live, endpoint energy and shape factor in the decay of27Si and24Na with an on-line beta spectrometer

Reactions 2H(d, p)3H and 2H(d, n)3He below 150 keV