The B(E2)B(E2) anomaly: Evidence for a low-lying mixed-symmetry collective excitation mode

This paper proposes that the anomalous suppression of B(E2;41+21+)/B(E2;21+0gs+)B(E2;4^+_1\rightarrow2^+_1)/B(E2;2^+_1\rightarrow0^+_{\mathrm{gs}}) ratios in neutron-deficient nuclei, which standard models fail to explain, arises from a low-lying mixed-symmetry collective excitation mode that bridges single-particle and collective dynamics.

Bo Cederwall, Chong Qi2026-04-14⚛️ nucl-ex

Toward Neutrino and Dark Matter Detection with Ancient Minerals: TEM Study of Heavy-Ion Tracks in Olivine

This study validates olivine as a promising candidate for the "paleo-detector" technique by using STEM to characterize heavy-ion tracks at various depths without etching, confirming that observed changes in track continuity align with SRIM simulation predictions regarding the transition between electronic and nuclear stopping power.

Andrew Calabrese-Day, Emilie LaVoie-Ingram, Kathryn Ream, Hannah Ross, Joshua Spitz, Patrick Stengel, Kai Sun, Alexander Takla2026-04-14⚛️ nucl-ex

Nonlinear response of flow harmonics in Gubser flow with participant-reaction planes mismatch

This paper extends perturbative Gubser flow solutions to derive analytic nonlinear response relations for flow harmonics v2v_2 and v4v_4, revealing that a mismatch between participant and reaction planes introduces a critical angular factor that can significantly alter the magnitude and even the sign of effective nonlinear response coefficients.

Xiang Ren, Jin-Yu Hu, Hao-jie Xu, Shi Pu2026-04-14⚛️ nucl-ex

All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective

This paper presents the TQ4Q2.0 fragmentation functions, a high-precision, uncertainty-quantified framework for modeling the production of all-heavy SS-wave tetraquarks in hadronic collisions, which extends previous models by incorporating nonconstituent heavy-quark contributions and advanced evolution schemes to establish a definitive baseline for future collider phenomenology.

Francesco Giovanni Celiberto2026-04-14⚛️ nucl-ex

New limits on the Pauli forbidden transitions in 12C nuclei obtained with the complete Borexino dataset

Using the complete Borexino dataset from 2007 to 2021, researchers established the most stringent experimental limits to date on the lifetime of 12C^{12}\text{C} nuclei against Pauli exclusion principle-forbidden transitions, setting lower bounds ranging from 103010^{30} to 103210^{32} years for various decay channels and deriving extremely tight upper limits on the relative strengths of such non-Paulian processes.

Borexino collaboration, D. Basilico, G. Bellini, J. Benziger, R. Biondi, B. Caccianiga, A. Caminata, A. Chepurnov, D. D Angelo, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, I. Machulin, J. Martyn, E. Meroni, L. Miramonti, M. Misiaszek, V. Muratova, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Pelicci, O. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. T. Ranalli, G. Ranucci, A. Razeto, A. Re, N. Rossi, S. Schonert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, R. Tartaglia, G. Testera, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, M. Wojcik, M. Wurm, S. Zavatarelli, K. Zuber, G. Zuzel2026-04-13⚛️ nucl-ex

Towards better nuclear charge radii

This paper outlines a modern, transparent, and methodologically robust effort to improve the precision and reliability of nuclear charge radii determinations by integrating complementary experimental techniques with advanced theoretical frameworks.

István Angeli, Dimiter L. Balabanski, Paraskevi Dimitriou, Dipti, Kieran T. Flanagan, Georgi Georgiev, Mikhail Gorchtein, Paul Gùeye, Fabian Heiße, Andreas Knecht, Kei Minamisono, Wilfried Nörtershäuser, Ben Ohayon, Natalia S. Oreshkina, B. K. Sahoo, Hunter Staiger, Endre Takacs, Xiaofei Yang, Deyan T. Yordanov2026-04-13⚛️ nucl-ex

From binding and saturation to criticality in nuclear matter from lattice effective field theory

This study utilizes lattice effective field theory to demonstrate that while refined nuclear interactions improve zero-temperature binding and saturation properties, they also significantly lower the critical temperature of symmetric nuclear matter, establishing finite-temperature criticality as a distinct and essential benchmark for future interaction development.

Osman Agar, Zhengxue Ren, Serdar Elhatisari2026-04-13⚛️ nucl-ex

Statistical uncertainty quantification for multireference covariant density functional theory

This paper presents a Bayesian framework for quantifying statistical uncertainties in covariant density functional theory by sampling parameter variations and propagating posterior distributions via a subspace-projected approach, successfully reproducing observables for deformed nuclei while highlighting current limitations in describing near-spherical systems.

X. Zhang, C. C. Wang, C. R. Ding, J. M. Yao2026-04-10⚛️ nucl-ex

Probing the Dependence of Partonic Energy Loss on the Initial Energy Density of the Quark Gluon Plasma

This paper utilizes a phenomenological spectrum shift model to demonstrate a striking correlation between average partonic transverse momentum loss and the initial energy density of the Quark-Gluon Plasma across a wide range of collision energies, while also successfully predicting high-pTp_{\mathrm{T}} hadron elliptic flow by coupling the model to geometric event shape estimates.

Ian Gill, Ryan J. Hamilton, Helen Caines2026-04-10⚛️ nucl-ex

Precise 136^{136}Xe Double Beta Decay Measurement in PandaX-4T with Implications on the Nuclear Matrix Elements and Majorons

Using 39.1 kg·yr of exposure from the PandaX-4T experiment, this study presents the most precise measurement to date of the 136^{136}Xe two-neutrino double beta decay half-life, provides a consistent measurement of the nuclear matrix element ratio ξ312ν\xi_{31}^{2\nu}, and establishes the world's most stringent limit on Majoron-emitting modes with spectral index n=7n=7.

PandaX Collaboration, Zhe Yuan, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Xiangyi Cui, Manna Deng, Yingjie Fan, Deqing Fang, Xuanye Fu, Zhixing Gao, Yujie Ge, Lisheng Geng, Karl Giboni, Xunan Guo, Xuyuan Guo, Zichao Guo, Chencheng Han, Ke Han, Changda He, Jinrong He, Houqi Huang, Junting Huang, Yule Huang, Ruquan Hou, Xiangdong Ji, Yonglin Ju, Xiaorun Lan, Chenxiang Li, Jiafu Li, Mingchuan Li, Peiyuan Li, Shuaijie Li, Tao Li, Yangdong Li, Zhiyuan Li, Qing Lin, Jianglai Liu, Yuanchun Liu, Congcong Lu, Xiaoying Lu, Lingyin Luo, Yunyang Luo, Yugang Ma, Yajun Mao, Yue Meng, Binyu Pang, Ningchun Qi, Zhicheng Qian, Xiangxiang Ren, Dong Shan, Xiaofeng Shang, Xiyuan Shao, Guofang Shen, Manbin Shen, Wenliang Sun, Xuyan Sun, Yi Tao, Yueqiang Tian, Yuxin Tian, Anqing Wang, Guanbo Wang, Hao Wang, Haoyu Wang, Jiamin Wang, Lei Wang, Meng Wang, Qiuhong Wang, Shaobo Wang, Shibo Wang, Siguang Wang, Wei Wang, Xu Wang, Zhou Wang, Yuehuan Wei, Weihao Wu, Yuan Wu, Mengjiao Xiao, Xiang Xiao, Kaizhi Xiong, Jianqin Xu, Yifan Xu, Shunyu Yao, Binbin Yan, Xiyu Yan, Yong Yang, Peihua Ye, Chunxu Yu, Ying Yuan, Youhui Yun, Xinning Zeng, Minzhen Zhang, Peng Zhang, Shibo Zhang, Siyuan Zhang, Shu Zhang, Tao Zhang, Wei Zhang, Yang Zhang, Yingxin Zhang, Yuanyuan Zhang, Li Zhao, Kangkang Zhao, Jifang Zhou, Jiaxu Zhou, Jiayi Zhou, Ning Zhou, Xiaopeng Zhou, Zhizhen Zhou, Chenhui Zhu, Dong-Liang Fang, Yu-Feng Li2026-04-10⚛️ nucl-ex

Ground State Decay of the Three-Proton Emitter 17^{17}Na Reveals Isospin Symmetry Breaking

This study reveals that the ground state of the exotic three-proton emitter 17^{17}Na has a significantly lower decay energy and narrower width than previously estimated, with its sequential decay pattern and systematic mirror energy differences providing strong evidence for general isospin symmetry breaking in light to medium-mass nuclei beyond the proton drip line.

X. -D. Xu, I. Mukha, Z. C. Xu, S. M. Wang, K. Y. Zhang, L. Acosta, E. Casarejos, D. Cortina-Gil, J. M. Espino, A. Fomichev, H. Geissel, J. Gómez-Camacho, L. V. Grigorenko, O. Kiselev, A. A. Korsheninnikov, N. Kurz, Yu. A. Litvinov, I. Martel, C. Nociforo, M. Pfützner, C. Rodríguez-Tajes, C. Scheidenberger, M. Stanoiu, K. Sümmerer, H. Weick, P. J. Woods, M. V. Zhukov2026-04-10⚛️ nucl-ex