Wed·Nov 20, 2019Wednesday·November 20, 2019

1. 01*

   Signatures of the $d^{\ast }(2380)$ hexaquark in d($\gamma$,$p\vec{n}$)

   M. Bashkanov · D.P. Watts · S.J.D. Kay · S. Abt · P. Achenbach · P. Adlarson · F. Afzal · P. Aguar Bartolome · Z. Ahmed · C.S. Akondi · J.R.M. Annand · H.J. Arends and 65 other authors

   We report a measurement of the spin polarisation of the recoiling neutron in deuterium photodisintegration, utilising a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300~--~700~MeV provides the first measurement of recoil neutron polarisation at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarisation in a narrow structure centred around $E_{\gamma }\sim$~570~MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behaviour could be related to the excitation of the $d^{\ast }(2380)$ hexaquark.

   nucl-exPRL(2020)·30 citations
2. 02*

   Equilibrium constants of Hydrogen and Helium isotopes at low nuclear densities

   R. Bougault🇫🇷 · E. Bonnet🇫🇷 · B. Borderie🇫🇷 · A. Chbihi🇫🇷 · J. D. Frankland🇫🇷 · E. Galichet🇫🇷 · D. Gruyer🇫🇷 · M. Henri🇫🇷 · M. La Commara🇮🇹 · N. Le Neindre🇫🇷 · I. Lombardo🇮🇹 · O. Lopez🇫🇷 and 5 other authors

   Equilibrium constants for Hydrogen and Helium isotopes as a function of density and temperature are measured in the framework of the study made by Qin et al. [Qin L et al 2012 Phys. Rev. Lett. 108 172701]. We review and comment on all stages of the analysis and conclude that our measurements are not inconsistent with Qin et al. results. Improvements are being made to the initial analysis and we raise the issue of the binding energies which has to be clarified.

   nucl-exnucl-thJ.Phys.G(2020)·29 citations
3. 03*

   Spin coating TPB film on acrylics and measurement of its wavelength shifting efficiency

   Hang Yang🇨🇳 · Zi-Feng Xu🇨🇳 · Jian Tang🇨🇳 · Yi Zhang🇨🇳

   Scintillation light from liquid noble gas in a neutrino or dark matter experiment lies typically within the vacuum ultraviolet (VUV) region and might be strongly absorbed by surrounding materials such as light guides or photomultiplier. Tetraphenyl butadiene (TPB) is a fluorescent material and acts as a wavelength shifter (WLS) which can turn the UV light to the visible light around a peak wavelength of 425 nm, enabling the light signals to be detected easily for physics study. Compared with a traditional TPB coating method using vapor deposition, we propose an alternative technique with a spin coating procedure in order to facilitate the development of neutrino and dark matter detectors. This article introduces how to fabricate the TPB film on acrylics using the spin coating method, reports measurement of sample film thickness and roughness, shows the reemission spectrum, and quantifies the wavelength shifting efficiency (WLSE).

   ↳ physics.ins-dethep-exnucl-exNucl.Sci.Tech.(2020)·8 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.