Wed·Oct 11, 2023Wednesday·October 11, 2023

1. 01*

   Measurement of nuclear effects in neutrino-argon interactions using generalized kinematic imbalance variables with the MicroBooNE detector

   MicroBooNE collaboration: P. Abratenko · O. Alterkait · D. Andrade Aldana · L. Arellano · J. Asaadi · A. Ashkenazi · S. Balasubramanian · B. Baller · G. Barr · D. Barrow · J. Barrow · V. Basque and 175 other authors

   We present a set of new generalized kinematic imbalance variables that can be measured in neutrino scattering. These variables extend previous measurements of kinematic imbalance on the transverse plane, and are more sensitive to modeling of nuclear effects. We demonstrate the enhanced power of these variables using simulation, and then use the MicroBooNE detector to measure them for the first time. We report flux-integrated single- and double-differential measurements of charged-current muon neutrino scattering on argon using a topolgy with one muon and one proton in the final state as a function of these novel kinematic imbalance variables. These measurements allow us to demonstrate that the treatment of charged current quasielastic interactions in GENIE version 2 is inadequate to describe data. Further, they reveal tensions with more modern generator predictions particularly in regions of phase space where final state interactions are important.

   nucl-exhep-exPRD(2024)·29 citations
2. 02*

   Experimental neutrino physics in a nuclear landscape

   D. S. Parno🇺🇸 · A. W. P. Poon🇺🇸 · V. Singh🇺🇸

   There are profound connections between neutrino physics and nuclear experiments. Exceptionally precise measurements of single and double beta-decay spectra illuminate the scale and nature of neutrino mass and may finally answer the question of whether neutrinos are their own antimatter counterparts. Neutrino-nucleus scattering underpins oscillation experiments and probes nuclear structure, neutrinos offer a rare vantage point into collapsing stars and nuclear fission reactors, and techniques pioneered in neutrino nuclear-physics experiments are advancing quantum-sensing technologies. In this article, we review current and planned efforts at the intersection of neutrino and nuclear experiments.

   nucl-exhep-exnucl-thPhil.Trans.Roy.Soc.Lond.A(2024)·2 citations
3. 03*

   Experimental Evidence of Large Collective Enhancement of Nuclear Level Density and its Significance in Radiative Neutron Capture

   T. Santhosh · P. C. Rout · S. Santra🇮🇳 · A. Shrivastava🇮🇳 · G. Mohanto · S. K. Pandit🇮🇳 · A. Pal🇮🇳 · Ramandeep Gandhi · A. Baishya · Sangeeta Dhuri🇮🇳

   The collective enhancement of nuclear level density and its fade out with excitation energy in deformed ${}^{171}$Yb nucleus has been inferred through an exclusive measurement of neutron spectra.The statistical model analysis of neutron spectra demonstrated a large collective enhancement factor of 40$\pm$3 for the first time, which corroborates with the recent microscopic model predictions but is an anomalous result compared with the measurements in the nearby deformed nuclei. The complete picture of the energy dependent collective enhancement has been obtained by combining with Oslo data below neutron binding energy. The significance of large collective enhancement in radiative neutron capture cross section of astrophysical interest is highlighted.

   nucl-exPLB(2023)·13 citations
4. 04*

   $g_{9/2}$ neutron strength in the $N=29$ isotones and the ${}^{52}$Cr($d,p$)${}^{53}$Cr reaction

   L. A. Riley🇺🇸 · D. T. Simms · L. T. Baby🇺🇸 · A. L. Conley🇺🇸 · P. D. Cottle🇺🇸 · J. Esparza · K. Hanselman🇺🇸 · I. C. S. Hay🇺🇸 · M. Heinze · B. Kelly🇺🇸 · K. W. Kemper🇺🇸 · G. W. McCann🇺🇸 and 3 other authors

   We performed a measurement of the ${}^{52}$Cr$(d,p{)}^{53}$Cr reaction at 16 MeV using the Florida State University Super-Enge Split-Pole Spectrograph (SE-SPS) and observed 26 states. While all of the states observed here had been seen in previous $(d,p)$ experiments, we changed five $L$ assignments from those reported previously and determined $L$ values for nine states that had not had such assignments made previously. The $g_{9/2}$ neutron strength observed in ${}^{53}$Cr in the present work and in the $N=29$ isotones ${}^{49}$Ca, ${}^{51}$Ti, and ${}^{55}$Fe via $(d,p)$ reactions is much smaller than the sum rule for this strength. Most of the observed $L=4$ strength in these nuclei is located in states near 4 MeV excitation energy. The remaining $g_{9/2}$ strength may be located in the continuum or may be fragmented among many bound states. A covariant density functional theory calculation provides support for the hypothesis that the $g_{9/2}$ neutron orbit is unbound in ${}^{53}$Cr. The ($\alpha {,}^3$He) reaction may provide a more sensitive probe for the missing $g_{9/2}$ neutron strength. In addition, particle-$\gamma$ coincidence experiments may help resolve some remaining questions in this nucleus.

   nucl-exnucl-thPRC(2023)·4 citations
5. 05*

   Influence of additional neutrons on the fusion cross-section beyond the N=8 shell

   S. Hudan🇺🇸 · H. Desilets🇺🇸 · Rohit Kumar🇺🇸 · R.T. deSouza🇺🇸 · C. Ciampi🇫🇷 · A. Chbihi🇫🇷 · K.W. Brown🇺🇸

   Fusion enhancement for neutron-rich isotopes of oxygen on carbon nuclei was probed. To measure the fusion cross-section a ${}^{20}$O beam accelerated to E${}_{lab}$/A=2.7 MeV bombarded the active-target detector MuSIC@Indiana with a fill gas of CH${}_4$. Examination of the average fusion cross-section over the interval 12 MeV $\le$E${}_{c.m.}$$\le$ 17 MeV for ${}^{16-20}$O + ${}^{12}$C reveals that while even isotopes of oxygen exhibit essentially the same cross-section, the cross-section for odd isotopes can be either enhanced or suppressed relative to the even A members of the isotopic chain. Theoretical models fail to explain the observed experimental results.

   nucl-exnucl-thPRC(2024)·3 citations
6. 06*

   A Mössbauer Scheme to Probe Gravitational Waves

   Yu Gao🇨🇳 · Huaqiao Zhang🇨🇳 · Wei Xu🇨🇳

   Under the local gravitational field, perturbations from high-frequency gravitational waves can cause a vertical shift of the Mössbauer resonance height. Considering a stationary scheme with the ${}^{109}$Ag isotope, we demonstrate that the extremely high precision of Mössbauer resonance allows for competitive gravitational wave sensitivity from KHz up to above MHz frequencies. Mössbauer resonance can offer a novel and small-sized alternative in the quest of multi-band gravitational wave searches. The presence of the static gravitational field plays essential role in the detection mechanism, isotope selection and sensitivity forecast. The proposed stationary scheme's sensitivity has the potential of significant improvement in a low-gravity environment.

   ↳ gr-qcastro-ph.IMnucl-exSci.Bull.(2024)·7 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.