# Nuclear Experiment

## New submissions

[ total of 7 entries: 1-7 ]
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### New submissions for Tue, 20 Mar 18

[1]
Title: Exclusive vector meson production at an electron-ion collider
Comments: 12 pages, 12 figures and 4 tables
Subjects: Nuclear Experiment (nucl-ex); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)

Coherent exclusive vector meson electroproduction is a key physics channel at an electron-ion collider. It probes the gluon structure of nuclei over a wide range of $Q^2$, and can be used to measure nuclear shadowing and to search for gluon saturation and/or the colored glass condensate. In this paper, we present calculations of the kinematic distributions for a variety of exclusive vector meson final states: the $\rho$, $\phi$, J/$\psi$, $\psi'$ and the $\Upsilon$ states. The cross-sections for light and $c\overline c$ mesons are large, while $\Upsilon$ states should be produced in moderate numbers at a medium energy EIC (the proposed U.S. designs) and in large numbers at the LHeC. We investigate the acceptances for these states, as a function of detector rapidity coverage. A large-acceptance detector is needed to cover the full range photon-nucleon collision energies produced at an EIC; a forward detector is required to observe vector mesons from the most energetic photon interactions, and thereby probe gluons at the lowest possible Bjorken-$x$ values.

[2]
Title: Proton-$η^\prime$ interactions at threshold
Comments: 5 pages, 5 figures
Subjects: Nuclear Experiment (nucl-ex)

Recent data on photoproduction of $\eta'$ mesons off protons have been included in the data base for the Bonn-Gatchina partial wave analysis. The real and imaginary parts of the $S$-wave $\eta^\prime p\to \eta^\prime p$ scattering amplitude in the threshold region were fit to yield the $\eta^\prime p$ scattering length and the interaction range. This new analysis found $|a_{\eta^\prime p}|= (0.403\pm 0.015\pm 0.060)$ fm and a phase $\phi=(87\pm2)^\circ$, while the range parameter is not well-constrained. The striking behavior of the GRAAL data on the beam asymmetry in the threshold region suggests that a narrow proton-$\eta'$ resonance might exist. However, the scattering length was found to be relatively insensitive to the possible existence of this narrow resonance.

[3]
Title: Main features of detectors and isotopes to investigate double beta decay with increased sensitivity
Authors: A.S. Barabash
Comments: 25 pages, 2 figures, 10 tables
Journal-ref: Int. J. Mod. Phys. A 33 (2018) 1843001
Subjects: Nuclear Experiment (nucl-ex); Instrumentation and Detectors (physics.ins-det)

The current situation in double beta decay experiments , the characteristics of modern detectors and the possibility of increasing the sensitivity to neutrino mass in future experiments are discussed. The issue of the production and use of enriched isotopes in double beta decay experiments is discussed in addition.

### Cross-lists for Tue, 20 Mar 18

[4]  arXiv:1803.06729 (cross-list from nucl-th) [pdf, other]
Title: Polar polarization: a new method for polarimetry analysis
Authors: D. Izraeli (1), I. Mardor (1,2), E.O. Cohen (1), M. Duer (1), T.Y. Izraeli (3), I. Korover (1,4), J. Lichtenstadt (1), E. Piasetzky (1) ((1) School of Physics and Astronomy, Tel Aviv University, Tel Aviv 6997801, Israel., (2) Soreq NRC, Yavne 81800, Israel., (3) Guardian Optical Technologies, Derech Hashalom 7, Tel Aviv 6789208, Israel., (4) Department of Physics, NRCN, P.O. Box 9001, Beer-Sheva 8419001, Israel.)
Subjects: Nuclear Theory (nucl-th); High Energy Physics - Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)

We present a novel analysis method for measurements of polarization transferred in $A(\vec{e},e'\vec{N})$ experiments, which can be applied to other kinds of polarization measurements as well. In this method the polarization transfer components are presented in spherical coordinates using an efficient likelihood numerical maximization based on an analytic derivation. We also propose a formalism that accounts for multi-parameter models, and which yields a smooth and continuous representation of the data (rather than using standard binning). Applying this method on simulated data generates results with reduced statistical and systematic uncertainties and enables revealing physical information that is lost in standard binning of the data. The obtained results can be compared easily to theoretical models and other measurements. Furthermore, CPU time is significantly reduced using this method.

[5]  arXiv:1803.06758 (cross-list from nucl-th) [pdf, ps, other]
Title: Impact of the $^7$Be($α, γ$)$^{11}$C reaction on the primordial abundance of $^7$Li
Comments: 15 pages and 2 figures
Subjects: Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Nuclear Experiment (nucl-ex)

We calculate the radiative capture cross section for $^7$Be($\alpha, \gamma$)$^{11}$C and its reaction rate for the big bang nucleosynthesis. The impact of this reaction on the primordial $^7$Li abundance is revised with the assumption of a narrow resonance in the low energy region. We show that such a resonance is unlikely to emerge within a two-body potential model. Taking the existence of this resonance for granted, we show that a small shift of its energy to a location right below the previously suggested value of $E_r=270$ KeV, with a narrow width of 160 eV, can modify substantially the $^7$Li abundance and solve the cosmological lithium puzzle.

[6]  arXiv:1803.06828 (cross-list from nucl-th) [pdf, ps, other]
Title: Multipole Modes for Triaxially Deformed Superfluid Nuclei
Comments: 4 pages, 2 figures, accepted for publication in Proceedings of Ito International Research Center (IIRC) Symposium "Perspectives of the Physics of Nuclear Structure" (JPS Proc. Conf.)
Subjects: Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)

To study shape fluctuations of nuclei in transitional regions, the collective Hamiltonian method has often been employed. We intend to construct the quadrupole collective Hamiltonian with the collective inertial functions given by the local quasiparticle random-phase approximation (QRPA) based on the Skyrme energy density functional. For this purpose, we first construct a practical framework of Skyrme QRPA for triaxial nuclear shapes with the finite amplitude method (FAM). We show quadrupole strength functions for a triaxial superfluid nucleus $^{188}$Os and the Thouless-Valatin rotational moment of inertia by the local FAM-QRPA for $^{106}$Pd.

### Replacements for Tue, 20 Mar 18

[7]  arXiv:1801.01250 (replaced) [pdf, other]
Title: Examining empirical evidence of the effect of superfluidity on the fusion barrier
Authors: Guillaume Scamps
Comments: 11 pages, 14 figures
Subjects: Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
[ total of 7 entries: 1-7 ]
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