Chinese Physics C

Schottky detection techniques for ultra-rare short-lived ions in heavy-ion storage rings

M. S. Sanjari, Yu. A. Litvinov, G. W. Hudson-Chang, S. Naimi, D. Dmytriiev, J. Glorius, E. Menz, T. Ohnishi, Zs. Podolyak, Th. Stöhlker, T. Yamaguchi, Y. Yamaguchi, A. Yano

2025, 49(8): 1-5. doi: 10.1088/1674-1137/adcc00

Abstract:
Non-destructive Schottky detectors are indispensable devices widely used in experiments at heavy-ion storage rings. In particular, they can be used to accurately determine the masses and lifetimes of short-lived exotic nuclear species. Single-ion sen...

Invariant mass spectroscopy of ¹⁵C

Jun-Bing Ma, Satoru Terashima, Hooi-Jin Ong, Zhi-Yu Sun, Yan-Yun Yang, Yan-Lin Ye, Jian-Ling Lou, Jian-Song Wang, Jia-Xing Han, Peng Ma, Kang Wang, Zhi-Chao Zhang, Shu-Ya Jin, Fang-Fang Duan, Guo Yang, Bing-Feng Lv, Xiao-Dong Xu, Zhen Bai, Shi-Wei Xu, Biao Yang, Yang Liu, Shi-Wei Bai, Kai Ma, Jia-Hao Chen, Gen Li, Zi-Yao Hu, Zhi-Wei Tan, Li-Sheng Yang, Shu-Jing Wang, Long-Chun Tao, Wei Liu, Ying Jiang, Jing-Jing Li, Yu-Shou Song, Li-Yuan Hu, Yao Li, Jun-Wei Li, Suyalatu Zhang, Mei-Rong Huang, De-Xin Wang

2025, 49(8): 084001. doi: 10.1088/1674-1137/add10c

Abstract:
Invariant-mass spectroscopy has been performed to search for possible resonance states in the loosely bound neutron-rich ¹⁵C nucleus. By detecting alpha and ¹¹Be in coincidence, we reconstruct the excitation energy spectrum for ¹⁵C. To estimate the p...

Determination of cross sections for the ⁸⁰Kr(n, 2n)⁷⁹Kr reaction in the neutron energy range of 13−15 MeV

Junhua Luo, Long He, Liang Zhou, Li Jiang

2025, 49(8): 084005. doi: 10.1088/1674-1137/adcc90

Abstract:
In this study, neutron activation experiments were performed to measure the (n, 2n) reaction cross section for ⁸⁰Kr at five neutron energies, 13.59±0.12, 13.86±0.15, 14.13±0.16, 14.70±0.13, and 14.94±0.02 MeV, using a highly enriched gaseous sample. ...

MLE analysis of the relationship between the initial-state granularity and final-state flow factorization

Shui-Fa Shen, Chong Ye, Dan Wen, Lina Bao, Jin Li, Yutao Xing, Jiaming Jiang, Wei-Liang Qian

2025, 49(8): 084104. doi: 10.1088/1674-1137/add70f

Abstract:
In this study, we employ the maximum likelihood estimator (MLE) to investigate the relationship between initial-state fluctuations and final-state anisotropies in relativistic heavy-ion collisions. The granularity of the initial state, reflecting flu...

Lifetime measurement of high spin states in non-yrast bands in ¹⁷⁷Re

R. Bhushan, A. Pandey, A. Rohilla, R.P. Singh, S. Muralithar, A. Kumar, I.M. Govil, G. H. Bhat, J.A. Sheikh, S. Jehangir, S. P. Rouoof, N. A. Rather, Nazira Nazir, S. K. Chamoli

2025, 49(8): 084006. doi: 10.1088/1674-1137/add8fb

Abstract:
The deformation driving tendency of various single particle orbitals near the Fermi surface has been investigated with the lifetime measurements of high spin states in the non-yrast bands of

$^{177}{\rm Re}$ nucleus. For this study, the $^{165}{\rm{H...

Effects of nucleon-nucleon short-range correlation on fragment generation in isotopic nuclear reactions

Ya-Fei Guo, Yong-Qing Feng, Zhao-Qing Feng, Gao-Chan Yong, Chun-Wang Ma

2025, 49(8): 084103. doi: 10.1088/1674-1137/add872

Abstract:
The effects of nucleon-nucleon short-range correlations leading to the high-momentum tail (HMT) in the nucleon momentum distribution are studied using the isospin- and momentum-dependent Lanzhou quantum molecular dynamics (LQMD) transport model. Base...

Neutron-proton isovector pairing correlations treatment in heated nuclei within the path integral formalism

M. Fellah, N. H. Allal, M. R. Oudih

2025, 49(8): 084101. doi: 10.1088/1674-1137/adc4cb

Abstract:
A method for the treatment of the neutron-proton (np) isovector pairing correlations at finite temperature is developed within the path integral formalism. It generalizes the recently proposed model using a similar approach for pairing between like-p...

A novel jet model for the Novikov-Thorne disk and its observable impact

Sen Guo, Pei Wang, Ke-Jian He, Guo-Ping Li, Xiao-Xiong Zeng, Wen-Hao Deng

2025, 49(8): 1-7. doi: 10.1088/1674-1137/add10e

Abstract:
Recent high-resolution observations have established a strong link between black hole jets and accretion disk structures, particularly in the 3.5 mm wavelength band [Nature. 616,686 (2023)]. In this work, we propose a "jet-modified Novikov-Thorne dis...

Spin alignment of quarkonia in vortical quark-gluon plasma

Liang Yuhao, Lin Shu

2025, 49(8): 084105. doi: 10.1088/1674-1137/adcc8c

Abstract:
The spin alignment of

$J/\psi$ with respect to the event plane in relativistic heavy ion collisions exhibits a significant signal. We propose a possible mechanism for spin alignment through the spin-dependent dissociation of quarkonia in vortical qu...

Rotational metric: a solution to Einstein's clock-rate problem and its magnetospheric applications

Zhen Zhang, Rui Zhang

2025, 49(8): 085102. doi: 10.1088/1674-1137/add9fb

Abstract:
The rotational metric provides an exact solution to Einstein's clock-rate problem in curved spacetime, specifically, whether time flows more slowly at the equator of a compact object such as a neutron star than at its poles. It features a curvature s...

Holography and the internal structure of charmonium

Nelson R.F. Braga, Yan F. Ferreira, William S. Cunha

2025, 49(8): 083105. doi: 10.1088/1674-1137/add674

Abstract:
Holographic models that consider classical vector fields in a 5-d background provide effective descriptions for heavy vector meson spectra. This is true both in vacuum and a thermal medium, such as quark gluon plasma. However, the manner in which the...

New contributions to b → sγ in the minimal G2HDM

Che-Hao Liu, Van Que Tran, Qiaoyi Wen, Fanrong Xu, Tzu-Chiang Yuan

2025, 49(8): 083107. doi: 10.1088/1674-1137/add873

Abstract:
We study flavor-changing bottom quark radiative decay

$b {\rightarrow} s \gamma$ induced at the one-loop level within the minimal gauged two-Higgs-doublet model (G2HDM). Among the three new contributions to this rare process in G2HDM, we find that ...

Search for radiative leptonic decay D⁺→γe⁺ν_e using deep learning

M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, Y. Ban, H.-R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, I. Boyko, R. A. Briere, A. Brueggemann, H. Cai, M. H. Cai, X. Cai, A. Calcaterra, G. F. Cao, N. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, G. R. Che, Y. Z. Che, G. Chelkov, C. Chen, C. H. Chen, Chao Chen, G. Chen, H. S. Chen, H. Y. Chen, M. L. Chen, S. J. Chen, S. L. Chen, S. M. Chen, T. Chen, X. R. Chen, X. T. Chen, X. Y. Chen, Y. B. Chen, Y. Q. Chen, Z. J. Chen, Z. K. Chen, S. K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. J. Cui, H. L. Dai, J. P. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, C. Q. Deng, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, B. Ding, X. X. Ding, Y. Ding, Y. X. Ding, J. Dong, L. Y. Dong, M. Y. Dong, X. Dong, M. C. Du, S. X. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, G. F. Fan, J. J. Fan, Y. H. Fan, J. Fang, S. S. Fang, W. X. Fang, Y. Q. Fang, R.

2025, 49(8): 083001. doi: 10.1088/1674-1137/adcdf3

Abstract:
Using 20.3 fb^–1 of

$e^+e^-$ annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we report on an improved search for the radiative leptonic decay

$D^+\to\gamma e^+\nu_e$ . An upper limit on its partial branchin...

Effect of decay cascade via an intermediate resonance in the γp → π⁰ηp reaction

Ai-Chao Wang, Neng-Chang Wei

2025, 49(8): 083109. doi: 10.1088/1674-1137/add09f

Abstract:
The

$\gamma p \to \pi^0 \eta p$ reaction has been investigated by the CBELSA/TAPS collaboration, revealing a narrow structure in the

$\eta p$ invariant mass distributions at a mass of 1700 MeV. In this study, we explore the possibility of the nar...

On the generalized Friedrichs-Lee model with multiple discrete and continuous states

Zhiguang Xiao, Zhi-Yong Zhou

2025, 49(8): 083102. doi: 10.1088/1674-1137/adcd4b

Abstract:
In this study, we present several improvements of the non-relativistic Friedrichs-Lee model with multiple discrete and continuous states while retaining its solvability. Our findings establish a solid theoretical basis for the exploration of resonanc...