Mon·Oct 9, 2023Monday·October 9, 2023

1. 01*

   Study of neutron multiplicity in ${}^{232}$Th (n,f) reaction using TALYS-1.96

   Punit Dubey · Ajay Kumar🇮🇳

   The nuclear scientific community views ${}^{232}$Th as an option for fuel in the future nuclear energy program. Numerous experimental studies have been conducted to determine the cross-section; however, very few have been performed to calculate the total neutron multiplicity above 10 MeV energy. In this work, we have compared the experimental data of average neutron multiplicity at different incident energies from EXFOR with the evaluated data from ENDF/B-VI, JENDL-4.0, and the calculated data from TALYS-1.96. The experimental data are in good agreement with the evaluated data from both the ENDF/B-VI and JENDL-4.0 libraries and at high incident energy (7 MeV), the TALYS-1.96 data are also in agreement with the experimental data.

   nucl-exnucl-th0 citations
2. 02*

   Variation of Tensor Force due to Nuclear Medium Effect

   Ziming Li🇨🇳 · Jie Zhu🇨🇳 · Taofeng Wang🇨🇳 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Chengjian Lin🇨🇳 · Zhiyu Sun🇨🇳 · Qinghua He🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇪🇸 · D. Beaumel🇫🇷 and 24 other authors

   The enhancement of $J^{\pi }(T)$=3${}^{+}$(0) state with isospin $T=0$ excited by the tensor force in the free ${}^6$Li nucleus has been observed, for the first time, relative to a shrinkable excitation in the ${}^6$Li cluster component inside its host nucleus. Comparatively, the excitation of $J^{\pi }(T)$=0${}^{+}$(1) state with isospin $T=1$ for these two ${}^6$Li formations take on an approximately equal excitation strength. The mechanism of such tensor force effect was proposed due to the intensive nuclear medium role on isospin $T$=0 state.

   nucl-exnucl-th0 citations
3. 03*

   Aspect of Clusters Correlation at Light Nuclei Excited State

   Ziming Li🇨🇳 · Jie Zhu🇨🇳 · Taofeng Wang🇨🇳 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Chengjian Lin🇨🇳 · Zhiyu Sun🇨🇳 · Qinghua He🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇺🇸 · D. Beaumel🇫🇷 and 24 other authors

   The correlation of $\alpha \alpha$ was probed via measuring the transverse momentum $p_T$ and width $\delta p_T$ of one $\alpha$, for the first time, which represents the spatial and dynamical essentialities of the initial coupling state in ${}^8$Be nucleus. The weighted interaction vertex of 3$\alpha$ reflected by the magnitudes of their relative momentums and relative emission angles proves the isosceles triangle configuration for 3$\alpha$ at the high excited energy analogous Hoyle states.

   nucl-exnucl-th0 citations
4. 04*

   Multi-alpha Boson Gas state in Fusion Evaporation Reaction and Three-body Force

   Taofeng Wang🇨🇳 · Ziming Li🇨🇳 · R. B. Wiringa🇺🇸 · Minliang Liu🇨🇳 · Jiansong Wang🇨🇳 · Yanyun Yang🇨🇳 · Qinghua He🇨🇳 · Zhiyu Sun🇨🇳 · Chengjian Lin🇨🇳 · M. Assié🇫🇷 · Y. Ayyad🇺🇸 · D. Beaumel🇫🇷 and 24 other authors

   The experimental evidence for the $\alpha$ Boson gas state in the ${}^{11}$C+${}^{12}$C$\to$${}^{23}$Mg${}^{\ast }$ fusion evaporation reaction is presented. By measuring the $\alpha$ emission spectrum with multiplicity 2 and 3, we provide insight into the existence of a three-body force among $\alpha$ particles. The observed spectrum exhibited distinct tails corresponding to $\alpha$ particles emitted in pairs and triplets consistent well with the model-calculations of AV18-UX and chiral effective field theory of NV2-3-la*, indicating the formation of $\alpha$ clusters with three-body force in the Boson gas state.

   nucl-exnucl-th0 citations
5. 05*

   Towards Precision Muonic X-Ray Measurements of Charge Radii of Light Nuclei

   Ben Ohayon · Andreas Abeln · Silvia Bara · Thomas Elias Cocolios · Ofir Eizenberg · Andreas Fleischmann · Loredana Gastaldo · César Godinho · Michael Heines · Daniel Hengstler · Guillaume Hupin · Paul Indelicato and 11 other authors

   We propose an experiment to measure the nuclear charge radii of light elements with up to 20~times higher accuracy. These are essential both for understanding nuclear physics at low energies, and for experimental and theoretical applications in simple atomic systems. Such comparisons advance the understanding of bound-state quantum electrodynamics and are useful for searching for new physics beyond the Standard Model. The energy levels of muonic atoms are highly susceptible to nuclear structure, especially to the mean square charge radius. The radii of the lightest nuclei (with the atomic number, $Z=1,2$) have been determined with high accuracy using laser spectroscopy in muonic atoms, while those of medium mass and above were determined using X-ray spectroscopy with semiconductor detectors. In this communication, we present a new experiment, aiming to obtain precision measurements of the radii of light nuclei $3\le Z\le 10$ using single-photon energy measurements with cryogenic microcalorimeters; a quantum-sensing technology capable of high efficiency with outstanding resolution for low-energy X-rays.

   ↳ physics.atom-phnucl-exnucl-thMDPI Physics(2024)·28 citations
6. 06*

   Probing the hidden-bottom pentaquark resonances in photonuclear bottomonium production near threshold: differential observables

   E. Ya. Paryev🇷🇺

   We study the near-threshold ${\rm Y}(1S)$ meson photoproduction from protons and nuclei by considering incoherent direct non-resonant ($\gamma p\to {\rm Y}(1S)p$, $\gamma n\to {\rm Y}(1S)n$) and two-step resonant ($\gamma p\to P_{bi}^{+}\to {\rm Y}(1S)p$, $\gamma n\to P_{bi}^0\to {\rm Y}(1S)n$, $i=1$, 2, 3; $P_{b1}^{+,0}=P_b^{+,0}(11080)$, $P_{b2}^{+,0}=P_b^{+,0}(11125)$, $P_{b3}^{+,0}=P_b^{+,0}(11130)$) bottomonium production processes with the main goal of clarifying the possibility to observe the non-strange hidden-bottom pentaquark states $P_{bi}^{+,0}$ in this production via differential observables. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of ${\rm Y}(1S)$ mesons on protons, on carbon and tungsten target nuclei at near-threshold incident photon beam energies by assuming the spin-parity assignments of the hypothetical hidden-bottom resonances $P_b^{+,0}(11080)$, $P_b^{+,0}(11125)$ and $P_b^{+,0}(11130)$ as $J^P=(1/2{)}^{-}$, $J^P=(1/2{)}^{-}$ and $J^P=(3/2{)}^{-}$ within four different realistic choices for the branching ratios of their decays to the ${\rm Y}(1S)p$ and ${\rm Y}(1S)n$ modes (0.125, 0.25, 0.5 and 1\%) as well as for two options for the background contribution. We demonstrate that the measurements of these combined observables on proton and nuclear targets in the near-threshold energy region in future experiments at the planned high-luminosity electron-ion colliders EIC and EicC in the US and China should provide evidence for the existence of the above hidden-bottom pentaquark resonances as well as clarify their decay rates.

   ↳ hep-phhep-exnucl-exnucl-thNPA(2024)·9 citations
7. 07*

   Preservation of ${}^3$He ion polarization after laser-plasma acceleration

   Chuan Zheng🇺🇸 · Pavel Fedorets · Ralf Engels · Ilhan Engin · Harald Glückler · Chrysovalantis Kannis · Norbert Schnitzler · Helmut Soltner🇩🇪 · Zahra Chitgar · Paul Gibbon · Lars Reichwein · Alexander Pukhov🇷🇺 · Bernhard Zielbauer · Markus Büscher

   The preservation of nuclear spin alignment in plasmas is a prerequisite for important applications, such as energy production through polarized fusion or the acceleration of polarized particle beams. Although this conservation property has been the basis of numerous theoretical papers, it has never been experimentally confirmed. Here, we report on first experimental data from a polarized ${}^3$He target heated by a PW laser pulse, showing evidence for persistence of the nuclear polarization after acceleration to MeV energies. The finding also validates the concept of using pre-polarized targets for experiments at high-power laser facilities.

   ↳ physics.plasm-phnucl-exHigh Power Laser Science and Engineering …·4 citations
8. 08*

   Application of the Most Frequent Value Method for ${}^{39}$Ar Half-Life Determination

   Victor V. Golovko

   An evaluation method supported by robust statistical analysis was used to analyze historical measurements of ${}^{39}$Ar half-life. The method, which combines the most frequent value (MFV) approach with bootstrap analysis, provides a more reliable way to estimate the half-life of ${}^{39}$Ar. The results show that the half-life is T1/2(MFV) = 268.2 + (3.1) - (2.9) years, with an uncertainty corresponding to the 68% confidence level. This uncertainty is three times smaller than the most precise re-calculated measurements by Stoenner et al. (1965) and 2.7 times smaller than the adopted half-life value in nuclear data sheets. Recently, the specific activity of the beta decay of ${}^{39}$Ar in atmospheric argon was measured in various underground facilities. Applying the MFV method to these measurements gives a specific activity of SA(${}^{39}$Ar/Ar)(MFV) = 0.966 + (0.010) - (0.018) Bq/kg(atmAr), with an uncertainty corresponding to the 68% confidence level. This paper also discusses the method used to determine the half-life of ${}^{39}$Ar using the specific activity of ${}^{39}$Ar in atmospheric argon.

   ↳ physics.geo-phastro-ph.IMnucl-exphysics.ao-phEPJC(2023)·10 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.