Thu·Mar 9, 2023Thursday·March 9, 2023

1. 01*

   Photoneutron emission cross sections for ${}^{13}$C

   H. Utsunomiya · S. Goriely🇧🇪 · M. Kimura🇯🇵 · N. Shimizu🇯🇵 · Y. Utsuno🇯🇵 · G.M. Tveten🇳🇴 · T. Renstrøm🇳🇴 · T. Ari-izumi · S. Miyamoto🇯🇵

   Photoneutron emission cross sections were measured for ${}^{13}$C below $2n$ threshold using quasi-monochromatic $\gamma$-ray beams produced in laser Compton-scattering at the NewSUBARU synchrotron radiation facility. The data show fine structures in the low-energy tail of the giant-dipole resonance; the integrated strength of the fine structure below 18~MeV is intermediate among the past measurements with bremsstrahlung and the positron annihilation $\gamma$ rays. We compare the photoneutron emission data with the {\sf TALYS} statistical model calculation implemented with the simple modified Lorentzian model of $E1$ and $M1$ strengths. We also compare the total photoabsorption cross sections for ${}^{13}$C with the shell model and antisymmetrized molecular dynamics calculations as well as the statistical model calculation. We further investigate the consistency between the present photoneutron emission and the reverse ${}^{12}$C(n,$\gamma$) cross sections through their corresponding astrophysical rate.

   nucl-exPRC(2024)·5 citations
2. 02*

   'Searching for a needle in a haystack;' A Ba-tagging approach for an upgraded nEXO experiment

   H. Rasiwala🇨🇦 · K. Murray🇨🇦 · Y. Lan🇨🇦 · C. Chambers🇨🇦 · M. Cvitan🇨🇦 · T. Brunner🇨🇦 · R. Collister🇨🇦 · T. Daniels🇺🇸 · R. Elmansali🇨🇦 · W. Fairbank🇺🇸 · R. Gornea🇨🇦 · G. Gratta🇺🇸 and 8 other authors

   nEXO is a proposed experiment that will search for neutrinoless double-beta decay (0$\nu \beta \beta$) in 5-tonnes of liquid xenon (LXe), isotopically enriched in ${}^{136}$Xe. A technique called Ba-tagging is being developed as a potential future upgrade for nEXO to detect the ${}^{136}$Xe double-beta decay daughter isotope, ${}^{136}$Ba. An efficient Ba-tagging technique has the potential to boost nEXO's 0$\nu \beta \beta$ sensitivity by essentially suppressing non-double-beta decay background events. A conceptual approach for the extraction from the detector volume, trapping, and identification of a single Ba ion from 5 tonnes of LXe is presented, along with initial results from the commissioning of one of its subsystems, a quadrupole mass filter.

   nucl-exphysics.ins-detNucl.Instrum.Meth.B(2023)·7 citations
3. 03*

   Analogies between hadron-in-jet and dihadron fragmentation

   Alessandro Bacchetta🇮🇹 · Marco Radici🇮🇹 · Lorenzo Rossi🇮🇹

   We describe the formal analogies in the description of the inclusive production in hard processes of hadron pairs (based on dihadron fragmentation functions) and of a single hadron inside a jet (based on hadron-in-jet fragmentation functions). Since several observables involving dihadron fragmentation functions have been proposed in the past, we are able to suggest new interesting observables involving hadron-in-jet fragmentation functions, in lepton-hadron deep-inelastic scattering and hadronic collisions.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·7 citations
4. 04*

   Exciting Ions: a Systematic Treatment of Ultraperipheral Heavy Ion Collisions with Nuclear Breakup

   L. A. Harland-Lang🇬🇧

   We present an updated theoretical treatment of ultraperipheral collisions (UPCs) of heavy ions, within the SuperChic Monte Carlo generator. This in particular accounts for mutual ion excitation through additional photon exchanges between the colliding ions. This effect occurs frequently in UPCs, and indeed can be (and has been) measured in data through the use of zero degree calorimeter (ZDC) detectors installed in the far forward region. The theoretical approach presented here accounts for the non-trivial and non-negligible impact such ion dissociation has on the measured cross sections and distributions of the produced particles in the central detectors. This builds on previous work, whereby the survival factor probability of no additional inelastic ion-ion scattering due to the strong interaction, and its kinematic impact, are also accounted for within the same overall framework. We compare to data from ATLAS and CMS at the LHC, and STAR at RHIC, and find in general encouraging agreement for a range of observables and ZDC neutron tags, with some room for further improvement, suggesting the inclusion of higher order QED effects and/or tuning of the the $\gamma A\to A^{\ast }$ cross section may be desirable. Overall, this gives confidence in the approach considered here and for applications to new phenomena within and beyond the Standard Model.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·21 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.