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- [1] arXiv:2503.15741 [中文pdf, pdf, html, 其他]
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标题： 无中微子$ββ$衰变在基于核能量密度泛函的相互作用玻色子模型中的研究标题： Neutrinoless $ββ$ decay in the interacting boson model based on the nuclear energy density functionalsS. Al Kharusi, G. Anton, I. Badhrees, P.S. Barbeau, V. Belov, T. Bhatta, M. Breidenbach, T. Brunner, G.F. Cao, W.R. Cen, C. Chambers, B. Cleveland, M. Coon, A. Craycraft, T. Daniels, L. Darroch, S.J. Daugherty, J. Davis, S. Delaquis, A. Der Mesrobian-Kabakian, R. DeVoe, A. Dolgolenko, M.J. Dolinski, J. Echevers, B. Eckert, W. Fairbank Jr., D. Fairbank, J. Farine, S. Feyzbakhsh, P. Fierlinger, Y.S. Fu, D. Fudenberg, P. Gautam, R. Gornea, G. Gratta, C. Hall, E.V. Hansen, J. Hoessl, P. Hufschmidt, M. Hughes, A. Iverson, A. Jamil, C. Jessiman, M.J. Jewell, A. Johnson, A. Karelin, L.J. Kaufman, T. Koffas, R. Krücken, A. Kuchenkov, K.S. Kumar, Y. Lan, A. Larson, B.G. Lenardo, D.S. Leonard, G.S. Li, S. Li, Z. Li, C. Licciardi, Y.H. Lin, R. MacLellan, T. McElroy, T. Michel, B. Mong, D.C. Moore, K. Murray, O. Njoya, O. Nusair, A. Odian, I. Ostrovskiy, H. Peltz Smalley, A. Perna, A. Piepke, A. Pocar, F. Retière, A.L. Robinson, P.C. Rowson, S. Schmidt, D. Sinclair, K. Skarpaas, A.K. Soma, V. Stekhanov, M. Tarka, S. Thibado, J. Todd, T. Tolba, T.I. Totev, R. Tsang, B. Veenstra, V. Veeraraghavan, P. Vogel, J.-L. Vuilleumier, M. Wagenpfeil, J. Watkins, M. Weber, L.J. Wen, U. Wichoski, G. Wrede, S.X. Wu, Q. Xia评论： 23页，14图，16表期刊参考： 物理评论C 112 (2025) 054310主题： 核理论 (nucl-th) ; 核实验 (nucl-ex)
无中微子$ββ$ ($0νββ$) 衰变核矩阵元 (NMEs) 在相互作用玻色子模型 (IBM) 中进行计算，该模型基于核能量密度泛函 (EDF) 理论。 IBM 的哈密顿量决定了发射$0νββ$衰变同位素及其相应最终核的基态和激发态的能量和波函数，这是通过将给定 EDF 得到的自洽平均场形变-能量曲面映射到相应的玻色子能量曲面而确定的。 转变算符使用广义优势方案进行表述，对结构常数由自洽计算提供的输入确定。 用非相对论和相对论 EDF 预测的$0νββ$-衰变 NME 值与不同多体方法得到的结果进行比较。 讨论了预测的 NME 对模型参数和假设的敏感性。
The neutrinoless $ββ$ ($0νββ$) decay nuclear matrix elements (NMEs) are calculated in the interacting boson model (IBM), which is based on the nuclear energy density functional (EDF) theory. The Hamiltonian of the IBM that gives rise to the energies and wave functions of the ground and excited states of $0νββ$ decay emitting isotopes and corresponding final nuclei is determined by mapping the self-consistent mean-field deformation-energy surface obtained with a given EDF onto the corresponding bosonic energy surface. The transition operators are formulated using the generalized seniority scheme, and the pair structure constants are determined by the inputs provided by the self-consistent calculations. The predicted values of the $0νββ$-decay NMEs with the nonrelativistic and relativistic EDFs are compared with those resulting from different many-body methods. Sensitivities of the predicted NMEs to the model parameters and assumptions are discussed.
新提交 (展示 1 之 1 条目 )
- [2] arXiv:2511.14593 (交叉列表自 hep-ex) [中文pdf, pdf, html, 其他]
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标题： JUNO反应堆中微子振荡的首次测量标题： First measurement of reactor neutrino oscillations at JUNO评论： 30页，11图主题： 高能物理 - 实验 (hep-ex)
中微子振荡是一种在宏观尺度上表现出来的量子效应，由轻子味混合角和中微子质量平方差所支配，这些是粒子物理的基本参数，代表了超出标准模型的现象。对这些参数的精确测量对于测试三味框架的完整性、确定中微子的质量顺序以及探索可能的新物理现象至关重要。江门地下中微子观测站（JUNO）是一个20千吨的液态闪烁体探测器，位于多个反应堆核心52.5公里处，旨在以百分之一以下的精度解析反应堆中微子的干涉图样。在这里，我们报告了自2025年8月探测器完成以来收集的前59.1天数据，首次同时高精度确定了正常质量顺序情景下的两个中微子振荡参数，$\sin^2 θ_{12} = 0.3092\,\pm\,0.0087$和$Δm^2_{21} = (7.50\,\pm\,0.12)\times10^{-5}\;{\rm eV}^2$，与所有先前测量的组合相比，精度提高了1.6倍。这些结果推进了对中微子的基本理解，验证了探测器的设计，并确认了JUNO为解决中微子质量顺序做好了准备。在短曝光下迅速取得的成果突显了JUNO在推动精密中微子物理前沿方面的潜力，并为其广泛的科学计划铺平了道路。
Neutrino oscillations, a quantum effect manifesting at macroscopic scales, are governed by lepton flavor mixing angles and neutrino mass-squared differences that are fundamental parameters of particle physics, representing phenomena beyond the Standard Model. Precision measurements of these parameters are essential for testing the completeness of the three-flavor framework, determining the mass ordering of neutrinos, and probing possible new physics. The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid-scintillator detector located 52.5 km from multiple reactor cores, designed to resolve the interference pattern of reactor neutrinos with sub-percent precision. Here we report, using the first 59.1 days of data collected since detector completion in August 2025, the first simultaneous high-precision determination of two neutrino oscillation parameters, $\sin^2 θ_{12} = 0.3092\,\pm\,0.0087$ and $Δm^2_{21} = (7.50\,\pm\,0.12)\times10^{-5}\;{\rm eV}^2$ for the normal mass ordering scenario, improving the precision by a factor of 1.6 relative to the combination of all previous measurements. These results advance the basic understanding of neutrinos, validate the detector's design, and confirm JUNO's readiness for its primary goal of resolving the neutrino mass ordering with a larger dataset. The rapid achievement with a short exposure highlights JUNO's potential to push the frontiers of precision neutrino physics and paves the way for its broad scientific program.
- [3] arXiv:2510.24894 (交叉列表自 hep-lat) [中文pdf, pdf, html, 其他]
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标题： 同位旋 $πππ$ 散射与来自QCD的 $ρ$ 共振子系统标题： Isotensor $πππ$ scattering with a $ρ$ resonant subsystem from QCD评论： 26页，10张图，v2版对前景、致谢和相关参考文献进行了轻微修改主题： 高能物理 - 格点 (hep-lat) ; 高能物理 - 现象学 (hep-ph) ; 高能物理 - 理论 (hep-th) ; 核理论 (nucl-th)
本工作提出了一种格点量子色动力学（QCD）方法，用于确定自旋-2通道的$πππ$散射振幅，其角动量和宇称分别为$J^{P} = 1^+$。 计算使用了不现实的重轻夸克质量，对应于介子质量为$m_π \approx 400$~MeV，在此情况下，$ρ$介子表现为一个窄共振。 分析采用了一种之前开发的公式，该公式非微扰地将两个介子和三个介子系统的有限体积谱与无限体积散射振幅相关联。 我们将先前对于具有自旋1和2的$ππ$系统的格点QCD结果与新确定的自旋-2三个介子有限体积谱相结合，这些新确定的谱是在三个立方、周期性格点体积上获得的，盒子长度范围从$\approx 4/m_π$到$6/m_π$。 这些综合数据限制了无限体积三个介子K矩阵的低能部分波，我们通过求解一组耦合积分方程来提取相应的散射振幅。
This work presents a lattice quantum chromodynamics (QCD) determination of $πππ$ scattering amplitudes for the isospin-2 channel with angular momentum and parity $J^{P} = 1^+$. The calculation is performed using unphysically heavy light-quark masses, corresponding to a pion mass of $m_π \approx 400$~MeV, for which the $ρ$ meson manifests as a narrow resonance. The analysis employs a previously developed formalism that non-perturbatively relates the finite-volume spectra of two- and three-pion systems to their infinite-volume scattering amplitudes. We combine earlier lattice QCD results for $ππ$ systems with isospins 1 and 2 with new determinations of the isospin-2 three-pion finite-volume spectrum, obtained for three cubic, periodic lattice volumes with box length ranging from $\approx 4/m_π$ to $6/m_π$. These combined data constrain the low-lying partial waves of the infinite-volume three-pion K matrix, from which we solve a set of coupled integral equations to extract the corresponding scattering amplitudes.
- [4] arXiv:2511.14561 (交叉列表自 physics.ins-det) [中文pdf, pdf, html, 其他]
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标题： 基于含碳硼烷的共轭聚合物的直接中子探测器标题： Direct Neutron Detectors based on Carborane Containing Conjugated PolymersAled Horner, Fani E. Taifakou, Choudhry Z. Amjad, Filip Aniés, Elizabeth George, Chris Allwork, Adrian J. Bevan, Martin Heeney, Theo Kreouzis主题： 仪器与探测器 (physics.ins-det) ; 核实验 (nucl-ex)
Thermal neutron detectors are crucial to a wide range of applications, including nuclear safety and security, cancer treatment, space research, non-destructive testing, and more. However, neutrons are notoriously difficult to capture due to their absence of charge, and only a handful of isotopes have a sufficient neutron cross-section. Meanwhile, commercially available $^3$He gas filled proportional counters suffer from depleting $^3$He feedstocks and complex device structures. In this work, we explore the potential of a carborane containing conjugated polymer ($o$CbT$_2$-NDI) as a thermal neutron detector. The natural abundance of $^{10}$B in such a polymer enables intrinsic thermal neutron capture of the material, making it the first demonstration of an organic semiconductor with such capabilities. In addition, we show that thermal neutron detection can be achieved also by adding a $^{10}$B$_4$C sensitiser additive to the analogous carborane-free polymer PNDI(2OD)2T, whereas unsensitised PNDI(2OD)2T control devices only respond to the fast neutron component of the radiation field. This approach allows us to disentangle the fast and thermal neutron responses of the devices tested and compare the relative performance of the two approaches to thermal neutron detection. 含有碳硼烷的和$^{10}$B$_4$C 敏化的装置在热中子作用下均表现出增强效应，高于未敏化的聚合物。 探测器响应在通量达到$1.796\,\times\,10^7\,$cm$^{-2}$s$^{-1}$ n$_{th}\bar{v}$时仍保持线性，并在高驱动偏压下饱和。 这项研究证明了碳硼烷聚合物作为中子探测器的可行性，突出了有机半导体固有的化学可调性，并为其在多种低成本、可扩展且易于加工的探测器技术中的应用开辟了可能性。
Thermal neutron detectors are crucial to a wide range of applications, including nuclear safety and security, cancer treatment, space research, non-destructive testing, and more. However, neutrons are notoriously difficult to capture due to their absence of charge, and only a handful of isotopes have a sufficient neutron cross-section. Meanwhile, commercially available $^3$He gas filled proportional counters suffer from depleting $^3$He feedstocks and complex device structures. In this work, we explore the potential of a carborane containing conjugated polymer ($o$CbT$_2$-NDI) as a thermal neutron detector. The natural abundance of $^{10}$B in such a polymer enables intrinsic thermal neutron capture of the material, making it the first demonstration of an organic semiconductor with such capabilities. In addition, we show that thermal neutron detection can be achieved also by adding a $^{10}$B$_4$C sensitiser additive to the analogous carborane-free polymer PNDI(2OD)2T, whereas unsensitised PNDI(2OD)2T control devices only respond to the fast neutron component of the radiation field. This approach allows us to disentangle the fast and thermal neutron responses of the devices tested and compare the relative performance of the two approaches to thermal neutron detection. Both the carborane containing and the $^{10}$B$_4$C sensitised devices displayed enhancement due to thermal neutrons, above that of the unsensitised polymer. The detector response is found to be linear with flux up to $1.796\,\times\,10^7\,$cm$^{-2}$s$^{-1}$ n$_{th}\bar{v}$ and saturates at high drive biases. This study demonstrates the viability of carboranyl polymers as neutron detectors, highlights the inherent chemical tuneability of organic semiconductors, and opens the possibility of their application to a number of different low-cost, scalable, and easily processable detector technologies.
- [5] arXiv:2511.13990 (交叉列表自 nucl-ex) [中文pdf, pdf, html, 其他]
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标题： 搜索$^{134}$Xe的双β衰变与EXO-200第二阶段标题： Search for Double Beta Decays of $^{134}$Xe with EXO-200 Phase II评论： 7页，2图主题： 核实验 (nucl-ex)
EXO-200是一个领先的双β衰变实验，由一个单相、富集液态氙时间投影室组成，其中含有80.672%的$^{136}$Xe和19.098%的$^{134}$Xe混合物。 探测器在WIPP运行期间从2010年到2018年运行，并设计用于搜索$^{136}$Xe的双β衰变。 数据采集分为两个阶段，中间有一个探测器升级期。 我们报告使用第二阶段EXO-200数据对$0νββ$和$2νββ$的$^{134}$Xe衰变的搜索结果，中位数90%置信度。 排除灵敏度分别为$T_{1/2}^{0ν} \geq 3.7\times 10^{23}$年和$T_{1/2}^{2ν} \geq 2.6 \times 10^{21}$年。 对于任何衰变模式都没有观察到统计学上显著的信号。 我们设定了中微子无湮灭衰变模式的$^{134}$Xe 半衰期的世界领先下限为$T_{1/2}^{0ν} \geq 8.7\times10^{23}$（90% 置信度） 以及对双中微子衰变的$T_{1/2}^{2ν} \geq 2.9\times10^{21}$的第二强约束（90% 置信度），相比 EXO-200 第一阶段的测量结果提高了三倍。 对于$2νββ$和$0νββ$衰变，对$^{134}$Xe 到$^{134}$Ba 最低激发态的新约束也被设定。
EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% $^{136}$Xe and 19.098% $^{134}$Xe. The detector operated at WIPP between 2010 and 2018 and was designed to search for double beta decay of $^{136}$Xe. Data was acquired in two phases separated by a period of detector upgrades. We report on the search for $0νββ$ and $2νββ$ decay of $^{134}$Xe with Phase II EXO-200 data, with median 90% C.L. exclusion sensitivity $T_{1/2}^{0ν} \geq 3.7\times 10^{23}$ yr and $T_{1/2}^{2ν} \geq 2.6 \times 10^{21}$ yr, respectively. No statistically significant signal is observed for either decay mode. We set a world-leading lower limit on the half-life of the neutrinoless decay mode of $^{134}$Xe of $T_{1/2}^{0ν} \geq 8.7\times10^{23}$ (90% C.L.) and the second strongest constraint on the two-neutrino decay of $T_{1/2}^{2ν} \geq 2.9\times10^{21}$ (90% C.L.), a 3-fold improvement over the EXO-200 Phase I measurement. New constraints are also set for the $2νββ$ and $0νββ$ decays of $^{134}$Xe to the lowest excited state of $^{134}$Ba.
交叉提交 (展示 4 之 4 条目 )
- [6] arXiv:2503.07841 (替换) [中文pdf, pdf, html, 其他]
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标题： 中子丰富的钌的电荷半径中的三轴性指纹标题： Fingerprints of triaxiality in the charge radii of neutron-rich RutheniumBernhard Maass, Wouter Ryssens, Michael Bender, Daniel P. Burdette, Jason Clark, Adam Dockery, Guilherme Grams, Max Horst, Phillip Imgram, Kristian König, Kei Minamisono, Patrick Müller, Peter Müller, Wilfried Nörtershäuser, Skyy V. Pineda, Simon Rausch, Laura Renth, Brooke Rickey, Daniel Santiago-Gonzalez, Guy Savard, Felix Sommer, Adrian A. Valverde评论： 12页，8图期刊参考： 物理评论快报 135, 202501 (2025)主题： 核实验 (nucl-ex) ; 核理论 (nucl-th)
我们展示了在阿贡国家实验室双三重直线加速器系统上使用新的共线激光光谱设置进行的首次测量，利用其独特的能力提供通过252Cf自发裂变产生的中子丰富的难熔金属同位素。 我们测量了九种放射性钌同位素106-114Ru的同位素位移，深入研究了中壳层区域。 提取的电荷半径与布鲁塞尔-网格Skyrme模型的预测高度一致，这些模型考虑了该区域核基态的三轴形变。 我们表明，在具有壳效应的模型中，三轴形变会影响电荷半径，这与从液滴分析中可能得出的结论相反。 这表明，即使通过激光光谱无法明确推断出这种奇特的形变存在，在已知其发生的区域也不应忽视它。
We present the first measurements with a new collinear laser spectroscopy setup at the Argonne Tandem Linac Accelerator System utilizing its unique capability to deliver neutron-rich refractory metal isotopes produced by the spontaneous fission of 252Cf. We measured isotope shifts from optical spectra for nine radioactive ruthenium isotopes 106-114Ru, reaching deep into the mid-shell region. The extracted charge radii are in excellent agreement with predictions from the Brussels-Skyrme-on-a-Grid models that account for the triaxial deformation of nuclear ground states in this region. We show that triaxial deformation impacts charge radii in models that feature shell effects, in contrast to what could be concluded from a liquid drop analysis. This indicates that this exotic type of deformation should not be neglected in regions where it is known to occur, even if its presence cannot be unambiguously inferred through laser spectroscopy.
- [7] arXiv:2511.13962 (替换) [中文pdf, pdf, html, 其他]
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标题： 轻暗物质的DAMIC-M日调制约束标题： Daily Modulation Constraints on Light Dark Matter with DAMIC-M评论： 11页，5图，已提交至PRD主题： 高能物理 - 实验 (hep-ex)
暗物质晕中粒子到达地下探测器的通量，由于地球内部的相互作用，对于足够大的散射截面会显著衰减。 这种衰减导致检测率出现特征性的每日调制，这是由于地球的自转引起的。 我们展示了使用DAMIC-M低本底腔体收集的1.257 kg-day数据集搜索这种调制的结果。 一种与模型无关的分析显示，在1到48小时的时间段内，1e-事件率没有显著的调制，突显了探测器出色的时空稳定性。 在一种互补的与模型相关的分析中，我们针对暗物质粒子预期的每日调制特征，这些粒子的质量范围在[0.53,2] MeV/c2之间，并通过暗光子媒介与电子相互作用。 通过利用信号预期的时间演化，我们对低于1.2 MeV/c2的暗物质质量设定了改进的限制，超过了我们之前的限制。
The flux of Hidden Sector particles from the Galactic halo reaching an underground detector can be significantly attenuated by interactions within the Earth for sufficiently large scattering crosssections. This attenuation gives rise to a characteristic daily modulation in the detection rate, due to Earth's rotation. We present results from a search for such a modulation using a 1.257 kg-day dataset collected with the DAMIC-M Low Background Chamber. A model-independent analysis reveals no significant modulation in the 1e- event rate over periods from 1 to 48 h, highlighting the excellent temporal stability of the detector. In a complementary model-dependent analysis, we target the expected daily modulation signature of Hidden Sector particles, with masses in the range [0.53,2] MeV/c2, interacting with electrons via a dark photon mediator. By leveraging the expected temporal evolution of the signal, we set improved constraints on Dark Matter masses below 1.2 MeV/c2, surpassing our previous limits.
- [8] arXiv:2511.14674 (替换) [中文pdf, pdf, html, 其他]
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标题： 同位旋多重态质量方程的偏差来自阈值态标题： Deviations from the Isobaric Multiplet Mass Equation due to threshold states评论： 7页，3图主题： 核理论 (nucl-th) ; 核实验 (nucl-ex)
最近的研究已经完成了自旋/宇称 Jπ =0+ 和 2+ 状态的 A=16 同位旋五重态。 它们的质量随同位旋投影的变化显示出偏离二次行为的证据，表明存在超出两体力预期的同位旋破坏。 这种偏差在 2+ 状态中最为明显。 嵌入连续谱中的壳模型（SMEC）的预测使我们能够解释这种同位旋破坏是由于五重态中富含质子的成员的开放量子系统性质导致的核结构修改。 特别是，16Ne 中的 0+ 和 2+ 状态以及 16F 中的 2+ 状态是位于质子衰变阈值上方的阈值共振，预期有 s 波与连续谱的耦合。 这些阈值状态相对于多重态其余成员的二次行为的测量偏差使得可以获取连续谱耦合能量修正的大小及其能量依赖性的信息。 连续谱耦合也出现在 8C 基态中，但这次是通过 p 波耦合。
Recent studies have completed the A=16 isospin quintets for states with spin/parity Jπ =0+ and 2+. The dependence of their masses as a function of isospin projection shows evidence for deviations from quadratic behavior indicating isospin violation beyond the expectation from two- body forces. The deviation is most pronounced for the 2+ states. Predictions from the Shell Model Embedded in the Continuum (SMEC) allow us to explain that this isospin violation is associated with a modification of the nuclear structure due to the open-quantum-system nature of the proton- rich members of the quintet. In particular, the 0+ and 2+ states in 16Ne and the 2+ state in 16F are threshold resonances located just above a proton-decay threshold where s-wave coupling to the continuum is expected. The measured deviations of these threshold states from the quadratic behavior of the remaining members of the multiplets makes it possible to obtain information on the magnitude and the energy dependence of the continuum-coupling energy correction. Continuum coupling is also indicated for the ground state of 8C, but this time through p-wave coupling.
- [9] arXiv:2511.14053 (替换) [中文pdf, pdf, html, 其他]
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标题： 磁场诱导的异常介子耦合标题： Magnetic field induced anomalous pion couplings评论： 11页，10图主题： 高能物理 - 现象学 (hep-ph)
由相对弱磁场引起的有效介子-组成夸克耦合被计算出来，它们在真空中消失。 特别是研究了与标量和矢量组成夸克电流的耦合。 这些耦合分别可以对应于中性介子波动到标量夸克-反夸克介子和矢量介子。 讨论了一些可能的现象学意义。
Effective pion-constituent quark couplings induced by relatively weak magnetic fields are calculated, being that they disappear in the vacuum. In particular, couplings to a scalar and a vector constituent quark currents are investigated. These couplings can correspond to a fluctuation of the neutral pion into a scalar quark-antiquark meson and to a vector meson respectively. Some possible phenomenological implications are discussed.
- [10] arXiv:2507.11495 (替换) [中文pdf, pdf, html, 其他]
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标题： 二粒子碎片化和能量关联中的束缚过渡标题： Dihadron Fragmentation and the Confinement Transition in Energy CorrelatorsS. Panda (a and b), P. K. Netrakanti (a), S. P. Behera (a and b), R. R. Sahu (a), K. Kumar (a and b), R. Sehgal (a), D. K. Mishra (a and b), V. Jha (a and b) ((a) Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India, (b) Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India)评论： 5页，2图；即将发表于PRL主题： 高能物理 - 现象学 (hep-ph) ; 高能物理 - 实验 (hep-ex) ; 核理论 (nucl-th)
在本信中，我们将$e^+e^- \to h_1 h_2 X$的分解与共线极限下能量-能量关联函数的分解联系起来。这使我们能够对能量关联函数给出非微扰证明，将能量关联函数喷注函数与对横向动量敏感的二介子碎片函数联系起来，并提供对束缚过渡区域的严格描述。
In this letter, we relate the factorization for $e^+e^- \to h_1 h_2 X$ to the factorization for energy-energy correlators in the collinear limit. This enables us to give a nonperturbative proof of factorization for the energy correlators, relate the energy correlator jet function to transverse-momentum-sensitive dihadron fragmentation functions, and provide a rigorous description of the confinement transition region.