Wed·Oct 16, 2024Wednesday·October 16, 2024

1. 01*

   Cluster production in Xe + Sn collisions between 65-150 MeV/nucleon

   T. Genard🇫🇷 · A. Chbihi🇫🇷 · C. Ciampi🇫🇷 · D. Durand🇫🇷 · Q. Fable🇫🇷 · A. LeFevre🇩🇪 · S. Mallik🇮🇳

   Characterization of the participant-zone (PZ) in the ${}^{129,124}$Xe + ${}^{112,124}$Sn reaction at the energy range 65-150 MeV/nucleon reveals copious cluster production. A detailed study of the chemical composition as a function of the impact parameter shows that heavier clusters (${}^6$He, ${}^{6-8}$Li, ${}^{7-10}$Be...) are most likely produced for central collisions. A hierarchy of the cluster production with the neutron-richness of the total system is observed, suggesting a full mixing of the projectile and target in the PZ. An estimate of the maximum density in central collisions has been deduced from the kinetic energy of the emitted fragments, reaching almost 2 time the normal density (2${\rho }_0$) at 150 MeV/nucleon.

   nucl-exNuovo Cim.C(2025)·0 citations
2. 02*

   First constraints on general neutrino interactions based on KATRIN data

   M. Aker🇩🇪 · D. Batzler🇩🇪 · A. Beglarian🇩🇪 · J. Beisenkötter🇩🇪 · M. Biassoni🇮🇹 · B. Bieringer🇩🇪 · Y. Biondi🇩🇪 · F. Block🇩🇪 · B. Bornschein🇩🇪 · L. Bornschein🇩🇪 · M. Böttcher🇩🇪 · M. Carminati🇮🇹 and 121 other authors

   The precision measurement of the tritium $\beta$-decay spectrum performed by the KATRIN experiment provides a unique way to search for general neutrino interactions (GNI). All theoretical allowed GNI terms involving neutrinos are incorporated into a low-energy effective field theory, and can be identified by specific signatures in the measured tritium $\beta$-spectrum. In this paper an effective description of the impact of GNI on the $\beta$-spectrum is formulated and the first constraints on the effective GNI parameters are derived based on the 4 million electrons collected in the second measurement campaign of KATRIN in 2019. In addition, constraints on selected types of interactions are investigated, thereby exploring the potential of KATRIN to search for more specific new physics cases, including a right-handed W boson, a charged Higgs or leptoquarks.

   nucl-exhep-exhep-phPRL(2025)·12 citations
3. 03*

   Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas Model

   Gil Paz🇺🇸

   The future neutrino research program will require improved precision. A major source of uncertainty is the interaction of neutrinos with nuclei that serve as targets for such experiments. Broadly speaking, this interaction often depends, e.g., for Charge-Current Quasi-Elastic (CCQE) scattering, on the combination of "nucleon physics" expressed by form factors and "nuclear physics" expressed by a nuclear model. It is important to get a good handle on both. This talk presents a fully analytic implementation of the Correlated Fermi Gas (CFG) Model for CCQE electron-nuclei and neutrino-nuclei scattering. The implementation is used to compare separately form factors and nuclear model effects for both electron-carbon and neutrino-carbon scattering data.

   ↳ hep-phhep-exhep-latnucl-ex+1PoS(2025)·0 citations
4. 04*

   Universal Mass Equation for Equal-Quantum Excited-States Sets I

   L. David Roper (VPI)🇺🇸 · Igor Strakovsky (GWU)🇺🇸

   The masses of fifteen baryon sets and twenty-four meson sets of three or more equal-quantum excited states, using Breit-Wigner PDG masses and their uncertainties at fixed $J^P$ for baryons and $J^{PC}$ for mesons, are fitted by a simple two-parameter logarithmic function, $M_n=\alpha Ln(n)+\beta$, where $n$ is the level of radial excitation. The conjecture is made that accurately measured masses of all equal-quantum baryons (including LHCb exotic $P_{c\bar{c}}^{+}$s) and meson excited states (including $s\bar{s}$, $s\bar{c}$, $c\bar{c}$, $c\bar{b}$, and $b\bar{b}$ states) are related by the logarithmic function used here; at least for the mass range of currently known excited states. The baryon ``star'' rating case is evaluated. The Cornell potential is an example of how a logarithmic behavior can be explained by an appropriate potential. Thus, a ``universal mass equation'' (UME) for equal-quantum excited-state sets is presented.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2025)·10 citations
5. 05*

   Constraints on neutrino-Majoron couplings using SN1987A data

   Pilar Iváñez-Ballesteros (APC, Paris)🇫🇷 · M. Cristina Volpe (APC, Paris)🇫🇷

   Neutrino decay to a lighter neutrino and a massless or almost massless (pseudo)scalar Goldstone boson remains of wide interest, as in the search for ultralight dark matter or for neutrinoless double beta-decay, and for its implications in astrophysics and cosmology. Neutrino interactions with Majorons can affect the dynamics of supernovae and impact the emitted neutrino flux. Using a three-neutrino framework and detailed supernova simulations, we perform the first likelihood analysis of the 24 neutrino events from SN1987A, including nonradiative decay in matter to a massless (pseudo)scalar boson like a Majoron. Focusing on the induced spectral distortions, we present bounds on the neutrino-Majoron couplings, as a function of the lightest neutrino mass, that are either complementary or competitive with current ones.

   ↳ hep-phastro-ph.HEastro-ph.SRhep-ex+2PRD(2025)·9 citations
6. 06*

   Non-relativistic neutrinos and the question of Dirac vs. Majorana neutrino nature

   Evgeny Akhmedov🇩🇪

   Finding out if neutrinos are Dirac or Majorana particles is known to be extremely difficult. This is generally believed to be due to the smallness of the neutrino mass compared to typical neutrino energies, and to the fact that in the limit of vanishing mass all distinctions between Dirac and Majorana neutrinos disappear. This, however, does not necessarily mean that for non-relativistic neutrinos distinguishing between them is an easy task. We consider this problem in detail. The issues discussed include the possibilities of studying neutrino nature with non-relativistic neutrinos produced in $\beta$ decay in direct neutrino mass measurement experiments, with relic neutrinos, as well as with slow neutrinos in pair production processes and in scattering, both elastic and inelastic. We also discuss processes allowed for only one of the two neutrino types as a means of uncovering neutrino nature.

   ↳ hep-phastro-ph.SRhep-exnucl-ex1 citation

* 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.