Thu·Jul 18, 2024Thursday·July 18, 2024

1. 01*

   Review of nonflow estimation methods and uncertainties in relativistic heavy-ion collisions

   Yicheng Feng🇺🇸 · Fuqiang Wang🇺🇸

   Collective anisotropic flow, where particles are correlated over the entire event, is a prominent phenomenon in relativistic heavy-ion collisions and is sensitive to the properties of the matter created in those collisions. It is often measured by two- and multi-particle correlations and is therefore contaminated by nonflow, those genuine few-body correlations unrelated to the global event-wise correlations. Many methods have been devised to estimate nonflow contamination with various degrees of successes and difficulties. Here, we review those methods pedagogically, discussing the pros and cons of each method, and give examples of ballpark estimate of nonflow contamination and associated uncertainties in relativistic heavy-ion collisions. We hope such a review of the various nonflow estimation methods in a single place would prove helpful to future researches.

   nucl-exnucl-thJ.Phys.G(2025)·17 citations
2. 02*

   Breakup dynamics of a neutron-halo projectile on heavy target at deep sub-barrier energies

   B. Mukeru · T. Sithole · Lauro Tomio🇧🇷

   By studying the total fusion and breakup cross-sections in the interaction of the neutron-halo ${}^{11}\mathrm{Be}$ projectile on the lead target ${}^{208}$Pb, it is shown that, even for the neutron-halo projectile, the breakup channel remains the most dominant reaction channel at sub-barrier energies, following a characteristic behavior that was also previously verified for the case of the proton-halo projectile ${}^8\mathrm{B}$. This feature is found to emanate from the enhancement of the breakup cross-section, due to the continuum-continuum couplings coming exclusively from its Coulomb component. We further speculate that the enhancement of the Coulomb breakup cross-section at sub-barrier incident energies by the continuum-continuum couplings could be associated with the projectile breaking up on the outgoing trajectory, provided these couplings can be proven to delay the breakup process.

   ↳ nucl-thnucl-exJ.Phys.G(2024)·0 citations
3. 03*

   Development of MMC-based lithium molybdate cryogenic calorimeters for AMoRE-II

   A. Agrawal · V.V. Alenkov · P. Aryal · H. Bae · J. Beyer · B. Bhandari · R.S. Boiko · K. Boonin · O. Buzanov · C.R. Byeon · N. Chanthima · M.K. Cheoun and 97 other authors

   The AMoRE collaboration searches for neutrinoless double beta decay of ${}^{100}$Mo using molybdate scintillating crystals via low temperature thermal calorimetric detection. The early phases of the experiment, AMoRE-pilot and AMoRE-I, have demonstrated competitive discovery potential. Presently, the AMoRE-II experiment, featuring a large detector array with about 90 kg of ${}^{100}$Mo isotope, is under construction. This paper discusses the baseline design and characterization of the lithium molybdate cryogenic calorimeters to be used in the AMoRE-II detector modules. The results from prototype setups that incorporate new housing structures and two different crystal masses (316 g and 517 - 521 g), operated at 10 mK temperature, show energy resolutions (FWHM) of 7.55 - 8.82 keV at the 2.615 MeV ${}^{208}$Tl $\gamma$ line, and effective light detection of 0.79 - 0.96 keV/MeV. The simultaneous heat and light detection enables clear separation of alpha particles with a discrimination power of 12.37 - 19.50 at the energy region around ${}^6$Li(n, $\alpha$)${}^3$H with Q-value = 4.785 MeV. Promising detector performances were demonstrated at temperatures as high as 30 mK, which relaxes the temperature constraints for operating the large AMoRE-II array.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-exEPJC(2025)·9 citations
4. 04*

   On the E-DeltaE low pressure pentane filled detection module of DGFRS-2 setup

   D. Ibadullayev · A.N. Polyakov · Yu. S. Tsyganov · A. A. Voinov🇺🇸 · M.V. Shumeiko

   The paper describes a new E-Delta-E detection module which includes a position-sensitive double-sided strip detector (DSSD) and a low-pressure pentane-filled Delta-E chamber for detection of Evaporation Residues (ER) in complete fusion nuclear reactions. The goal is to synthesize superheavy isotopes at the new DC-280 (Dubna Cyclotron) cyclotron of the Joint Institute for Nuclear Research (JINR). With the 48Ca ion beam intensity of about 5-7 pmcA (particle micro ampere) and the Delta-E counter count rate of approximately 1.0E+4 sec-1, we observe a decrease in the overall registration efficiency of the gas Delta-E counter. The paper proposes a solution to this problem: introduction of an additional negatively biased electrode, which results in the stabilization of the Delta-E detector operation.

   ↳ physics.ins-detnucl-ex0 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.