Nuclear Experiment·nucl-ex
5 papers—1 primary·4 cross-listed·reconstructed*
Lalit Kumar Sahoo · Chinmay Basu
The direct reaction component of the F(p,) reaction at E=180-600 keV is studied for the data that has become very recently available. This component has been found to be significant in the present work using the direct pickup model in framework of the DWBA formalism and indicate the strong cluster structure of F.
Giorgio Gratta🇺🇸 · David E. Kaplan🇺🇸 · Surjeet Rajendran🇺🇸
A new technique to search for new scalar and tensor interactions at the sub-micrometer scale is presented. The technique relies on small shifts of nuclear gamma lines produced by the coupling between matter and the nuclei in the source or absorber of a Mossbauer spectrometer. Remarkably, such energy shifts are rather insensitive to electromagnetic interactions that represent the largest background in searches for new forces using atomic matter. This is because nuclei are intrinsically shielded by the electron clouds. Additionally, electromagnetic interactions cause energy shifts by coupling to nuclear moments that are suppressed by the size of the nuclei, while new scalar interactions can directly affect these shifts. Finally, averaging over unpolarized nuclei, further reduces electromagnetic interactions. We discuss several possible configurations, using the traditional Mossbauer effect as well as nuclear resonant absorption driven by synchrotron radiation. For this purpose, we examine the viability of well known Mossbauer nuclides along with more exotic ones that result in substantially narrower resonances. We find that the technique introduced here could substantially improve the sensitivity to a variety of new interactions and could also be used, in conjunction with mechanical force measurements, to corroborate a discovery or explore the new physics that may be behind a discovery.
D. Everett🇺🇸 · W. Ke🇺🇸 · J.-F. Paquet🇺🇸 · G. Vujanovic🇺🇸 · S. A. Bass🇺🇸 · L. Du🇺🇸 · C. Gale🇨🇦 · M. Heffernan🇨🇦 · U. Heinz🇺🇸 · D. Liyanage🇺🇸 · M. Luzum🇧🇷 · A. Majumder🇺🇸 and 36 other authors
Using combined data from the Relativistic Heavy Ion and Large Hadron Colliders, we constrain the shear and bulk viscosities of quark-gluon plasma (QGP) at temperatures of MeV. We use Bayesian inference to translate experimental and theoretical uncertainties into probabilistic constraints for the viscosities. With Bayesian Model Averaging we account for the irreducible model ambiguities in the transition from a fluid description of the QGP to hadronic transport in the final evolution stage, providing the most reliable phenomenological constraints to date on the QGP viscosities.
R. Huang🇺🇸 · E. Armengaud🇫🇷 · C. Augier🇫🇷 · A. S. Barabash🇷🇺 · F. Bellini🇮🇹 · G. Benato🇮🇹 · A. Benoît🇫🇷 · M. Beretta🇮🇹 · L. Bergé🇫🇷 · J. Billard🇫🇷 · Yu. A. Borovlev🇷🇺 · Ch. Bourgeois🇫🇷 and 77 other authors
CUPID-Mo is a cryogenic detector array designed to search for neutrinoless double-beta decay () of Mo. It uses 20 scintillating Mo-enriched LiMoO bolometers instrumented with Ge light detectors to perform active suppression of backgrounds, drastically reducing the expected background in the signal region. As a result, pileup events and small detector instabilities that mimic normal signals become non-negligible potential backgrounds. These types of events can in principle be eliminated based on their signal shapes, which are different from those of regular bolometric pulses. We show that a purely data-driven principal component analysis based approach is able to filter out these anomalous events, without the aid of detector response simulations.
Joshua L. Barrow🇺🇸 · Steven Gardiner🇺🇸 · Saori Pastore🇺🇸 · Minerba Betancourt🇺🇸 · Joseph Carlson🇺🇸
The usage of Monte Carlo neutrino event generators (MCEGs) is a norm within the high-energy scattering community. The relevance of quasielastic (QE) energy regimes to oscillation experiments implies that accurate calculations of cross sections in this regime will be a key contributor to reducing the systematic uncertainties affecting the extraction of oscillation parameters. In spite of this, many MCEGs utilize highly phenomenological, parameterized models of QE scattering cross sections. Moreover, a culture of validation of MCEGs against prolific electron () scattering data has been historically lacking. In this work, we implement new cross sections obtained from nuclear ab initio approaches in GENIE, the primary MCEG utilized by the FNAL community. In particular, we utilize results from Quantum MC methods which solve the many-body nuclear problem in the Short-Time Approximation (STA), allowing consistent retention of two-nucleon dynamics which are crucial to explain available nuclear electromagnetic (electroweak) data over a wide range of energy and momentum transfers. This new implementation in GENIE is fully tested against the world QE electromagnetic data, finding agreement with available data below GeV of beam energy with the aid of a scaling function formalism. The STA is currently limited to study nuclei, however, its semi-inclusive multibody identity components are exportable to other many-body computational techniques such as Auxiliary Field Diffusion MC which can reach systems while continuing to realize the factorization contained within the STA's multinucleon dynamics. Together, these developments promise to make future experiments such as DUNE more accurate in their assessment of MCEG systematics, properties, and potentially empower the discovery of physics beyond the Standard Model.
* 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.