Article
Physics, Nuclear
G. Singh, Jagjit Singh, J. Casal, L. Fortunato
Summary: This study investigates the configuration mixing, matter radii, and neutron-neutron correlations in the neutron-rich fluorine isotope F-31. The results suggest the presence of a two-neutron halo in F-31, supported by the configuration mixing and increase in matter radius. The findings also indicate the low-lying electric dipole response as a characteristic of the halo nature.
Article
Physics, Nuclear
Xiang-Xiang Sun
Summary: Ground state properties of B-19 were studied using the deformed relativistic Hartree-Bogoliubov theory in continuum. The calculations with the density functional PK1 revealed that B-19 is a deformed two-neutron halo nucleus with shape decoupling effects. Strong quadrupole correlations mix sd orbitals and drive B-19 to be prolate, with the neutron core presenting a prolate shape and the neutron halo being oblate.
Article
Physics, Nuclear
Anna Corsi, Belen Monteagudo, F. Miguel Marques
Summary: The study reviews an extensive research on the beryllium isotopic chain conducted at RIKEN, focusing on Be-13 and Be-15 isotopes. It provides insights into dineutron configurations and decays in Be-14 and Be-16, with detailed analyses of spectroscopy and state observations in Be-13 and Be-15 cases. Perspectives on future studies in this field are also discussed.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Physics, Multidisciplinary
Jobaidul Islam, Shahidan Radiman, Kok Siong Khoo
Summary: The study focused on the T and Y configuration properties of the F-29 nucleus, with calculations done for separation energy and root mean square matter radius using MATLAB software. A positive core deformation was observed, indicating a prolate shaped halo nucleus, with high accuracies achieved for both T and Y configurations.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Astronomy & Astrophysics
A. J. Mead, L. Verde
Summary: A simple prescription is introduced to include beyond-linear halo bias in standard halo-model calculations, with a corrective term demonstrated to significantly boost power in the two-halo term. The magnitude of this boost depends on the specific pair of fields in the two-point function. The improvement in power prediction, especially in the transition region between the two- and one-halo terms, is largely attributed to the inclusion of full non-linear halo bias.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Nuclear
J. Okolowicz, M. Ploszajczak, W. Nazarewicz
Summary: Researchers used the real-energy continuum shell model to investigate beta-delayed proton emission from the neutron halo ground state of Be-11, suggesting the presence of a resonance, but found that the large beta-p branching ratio cannot be reconciled with other data.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2022)
Article
Astronomy & Astrophysics
L. Cavallo, G. Cescutti, F. Matteucci
Summary: In this paper, the authors investigate the origin of the large star-to-star variation in the [Eu/Fe] ratios in extremely metal-poor stars. By considering the chemical enrichment of Eu in the building blocks of the Galactic halo, they find that the dynamics of binary systems in the gravitational potential of the host galaxy play a role in the enrichment from neutron star mergers.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Physics, Multidisciplinary
Jagjit Singh, Takuma Matsumoto, Kazuyuki Ogata
Summary: The study indicates that the nuclear breakup, interference between nuclear and Coulomb amplitudes, and multistep breakup processes are all significant factors that cannot be ignored. The assumptions made in the VPT are found to be invalid for accurately describing breakup cross-sections.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2021)
Article
Physics, Nuclear
Wael Elkamhawy, Hans-Werner Hammer
Summary: We use Halo effective field theory (Halo EFT) to calculate the electromagnetic properties of the deformed one-neutron halo candidate Ne-31. In this framework, Ne-31 is bound by a resonant P-wave interaction between the Ne-30 core and the valence neutron. We adopt a spherical formalism to compute the electromagnetic form factors and the E1-breakup strength distribution of Ne-31 at leading order in Halo EFT, with the associated uncertainties estimated according to our power counting.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Sujatha Ramakrishnan, Aseem Paranjape, Ravi K. Sheth
Summary: Researchers have proposed an algorithm to address the correlation between galaxy properties and large-scale environments in large-scale sky surveys. By preserving the correlations between halo properties and intermediate-scale tidal environments, the algorithm accurately maintains the large-scale assembly bias of haloes, significantly expanding the reach of simulations in halo mass and number density. This leads to a 45% improvement in bias signal for 30-particle haloes, reducing the cost of mock catalogues for future weak lensing and redshift space distortion studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Physics, Particles & Fields
Kilar Zhang, Guo-Zhang Huang, Jie-Shiun Tsao, Feng-Li Lin
Summary: This paper proposes three scenarios for compact hybrid stars that could provide explanations for LIGO/Virgo events GW170817 and GW190425. By utilizing different equations of state, the study reveals that these hybrid stars may have thick dark matter shells, allowing them to be more massive than typical neutron stars while being electromagnetically detected with similar sizes.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Nuclear
K. Kuhn, F. Sarazin, F. M. Nunes, M. A. G. Alvarez, C. Andreoiu, D. W. Bardayan, P. C. Bender, J. C. Blackmon, M. J. G. Borge, R. Braid, B. A. Brown, W. N. Catford, C. Aa Diget, A. DiPietro, T. E. Drake, P. Figuera, A. B. Garnsworthy, J. Gomez-Camacho, G. Hackman, U. Hager, S. Ilyushkin, E. Nacher, P. D. O'Malley, A. Perea, V Pesudo, S. T. Pittman, D. Smalley, C. E. Svensson, O. Tengblad, P. Thompson, C. Unsworth, Z. M. Wang
Summary: The study investigates the nature of 1(-) and 2(-) excited states in Be-10 through the Be-11(p, d) transfer reaction, and finds that their structure is a complex mixture of cluster and halo structures, rather than being uniquely halo-like or cluster-like. The experiment specifically probed a halo-like Be-11 (1/2(+)) configuration in both states, limiting further insights into the structures of these excited states.
Article
Astronomy & Astrophysics
Luisa Lucie-Smith, Alexandre Barreira, Fabian Schmidt
Summary: We have developed a deep learning framework that connects the local formation process of dark matter haloes to the halo bias. By training a convolutional neural network (CNN), we can accurately predict the final mass and concentration of dark matter haloes from the initial conditions. The CNN is then utilized as a surrogate model to determine the halo bias parameters in response to long-wavelength perturbations in the initial conditions. Our framework provides insights into the physical aspects of halo formation and assembly bias.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Xinyi Liu, Shao-Chun Lee, Soenke Seifert, Lilin He, Changwoo Do, Randall E. Winans, Gihan Kwon, Tao Li
Summary: The relation between solvation structures and transport properties of LiTFSI aqueous solutions was investigated using small-angle X-ray scattering, small-angle neutron scattering, X-ray pair distribution function measurements, and molecular dynamics simulations. It was found that solvation structures of TFSI- consist of solvent separated ion pairs and contact ion pairs, as well as cation-anion aggregates. The relaxation time associated with the anion network structure exhibited the same concentration dependence as the viscosity. This study provides insight into the correlation between solvation structures and transport properties of imide-based lithium-ion salt aqueous electrolytes.
CHEMISTRY OF MATERIALS
(2023)
Article
Physics, Nuclear
Md A. Khan, M. Hasan, S. H. Mondal, M. Alam
Summary: This paper presents an effective theoretical scheme to study the ground and resonant levels of weakly bound nuclei near the neutron-dripline. The scheme employs hyperspherical harmonics expansion for the bound state and supersymmetric quantum mechanics (SSQM) for the resonant state. By solving the three-body Schrodinger equation and constructing a one-parameter family of isospectral potential, the scheme facilitates accurate computation of resonance energy and width.
Article
Astronomy & Astrophysics
S. Kim, J. W. Hwang, Y. Satou, N. A. Orr, T. Nakamura, Y. Kondo, J. GIbelin, N. L. Achouri, T. Aumann, H. Baba, F. Delaunay, P. Doornenbal, N. Fukuda, N. Inabe, T. Isobe, D. Kameda, D. Kanno, N. Kobayashi, T. Kubo, S. Leblond, J. Lee, F. M. Marques, R. Minakata, T. Motobayashi, D. Murai, T. Murakami, K. Muto, T. Nakashima, N. Nakatsuka, A. Navin, S. Nishi, S. Ogoshi, H. Otsu, H. Satoh, Y. Shimizu, H. Suzuki, K. Takahashi, H. Takeda, S. Takeuchi, R. Tanaka, Y. Togano, A. G. Tuff, M. Vandebrouck, K. Yoneda
Summary: Unbound states in 17C were studied by removing one neutron from an 18C beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of 17C above the single-neutron decay threshold was reconstructed using invariant mass spectroscopy, revealing resonances at 0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3), and 3.20(1) MeV. Through comparisons with calculations, the resonance at 0.77(2) MeV was tentatively assigned as the second 5/2+ state, while the resonances at 1.91(1) and 3.20(1) MeV were identified as p-shell hole states with spin-parities 1/2-1 and 3/2-1, respectively. A YSOX shell-model Hamiltonian based on the monopole-based universal interaction provided a good description of the results.
Article
Physics, Multidisciplinary
T. Pohl, Y. L. Sun, A. Obertelli, J. Lee, M. Gomez-Ramos, K. Ogata, K. Yoshida, B. S. Cai, C. X. Yuan, B. A. Brown, H. Baba, D. Beaumel, A. Corsi, J. Gibelin, A. Gillibert, K. I. Hahn, T. Isobe, Y. Kondo, T. Kobayashi, Y. Kubota, P. Li, P. Liang, H. N. Liu, J. Liu, T. Lokotko, F. M. Marques, Y. Matsuda, T. Motobayashi, T. Nakamura, N. A. Orr, H. Otsu, V. Panin, S. Y. Park, S. Sakaguchi, M. Sasano, H. Sato, H. Sakurai, Y. Shimizu, A. I. Stefanescu, L. Stuhl, D. Suzuki, T. Uesaka, H. Wang, X. Xu, Z. H. Yang, K. Yoneda, J. Zenihiro
Summary: We report on the first proton-induced single proton- and neutron-removal reactions from the neutron-deficient 14O nucleus with large Fermi-surface asymmetry Sn - Sp 1/4 18.6 MeV at similar to 100 MeV/nucleon, a widely used energy regime for rare-isotope studies. The measured inclusive cross sections and parallel momentum distributions of the 13N and 13O residues are compared to the state-of-the-art reaction models, with nuclear structure inputs from many-body shell-model calculations. Our results provide the first quantitative contributions of multiple reaction mechanisms including the quasifree knockout, inelastic scattering, and nucleon transfer processes. It is shown that the inelastic scattering and nucleon transfer are important tools for investigating single-particle strengths and correlations in atomic nuclei.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
S. Chen, F. Browne, P. Doornenbal, J. Lee, A. Obertelli, Y. Tsunoda, T. Otsuka, Y. Chazono, G. Hagen, J. D. Holt, G. R. Jansen, K. Ogata, N. Shimizu, Y. Utsuno, K. Yoshida, N. L. Achouri, H. Baba, D. Calvet, F. Chateau, N. Chiga, A. Corsi, M. L. Cortes, A. Delbart, J. -M. Gheller, A. Giganon, A. Gillibert, C. Hilaire, T. Isobe, T. Kobayashi, Y. Kubota, V. Lapoux, H. N. Liu, T. Motobayashi, I. Murray, H. Otsu, V. Panin, N. Paul, W. Rodriguez, H. Sakurai, M. Sasano, D. Steppenbeck, L. Stuhl, Y. L. Sun, Y. Togano, T. Uesaka, K. Wimmer, K. Yoneda, O. Aktas, T. Aumann, L. X. Chung, F. Flavigny, S. Franchoo, I. Gasparic, R. -B. Gerst, J. Gibelin, K. I. Hahn, D. Kim, T. Koiwai, Y. Kondo, P. Koseoglou, C. Lehr, B. D. Linh, T. Lokotko, M. MacCormick, K. Moschner, T. Nakamura, S. Y. Park, D. Rossi, E. Sahin, P. -A. Soderstrom, D. Sohler, S. Takeuchi, H. Tornqvist, V. Vaquero, V. Wagner, S. Wang, V. Werner, X. Xu, H. Yamada, D. Yan, Z. Yang, M. Yasuda, L. Zanetti
Summary: Gamma decays in Ca-56 and Ca-58 were observed following quasi-free one-proton knockout reactions. The transitions were tentatively assigned as the 2(1)(+) -> 0(gs)(+) decays and compared to results from ab initio and conventional shell-model approaches. A new nuclear shell above the N=34 shell was confirmed, indicating a potential extension of the dripline of Ca isotopes.
Article
Astronomy & Astrophysics
A. Corsi, Y. Kubota, J. Casal, M. Gomez-Ramos, A. M. Moro, G. Authelet, H. Baba, C. Caesar, D. Calvet, A. Delbart, M. Dozono, J. Feng, F. Flavigny, J. M. Gheller, J. Gibelin, A. Giganon, A. Gillibert, K. Hasegawa, T. Isobe, Y. Kanaya, S. Kawakami, D. Kim, Y. Kiyokawa, M. Kobayashi, N. Kobayashi, T. Kobayashi, Y. Kondo, Z. Korkulu, S. Koyama, V. Lapoux, Y. Maeda, F. M. Marques, T. Motobayashi, T. Miyazaki, T. Nakamura, N. Nakatsuka, Y. Nishio, A. Obertelli, A. Ohkura, N. A. Orr, S. Ota, H. Otsu, T. Ozaki, V. Panin, S. Paschalis, E. C. Pollacco, S. Reichert, J. Y. Rousse, A. T. Saito, S. Sakaguchi, M. Sako, C. Santamaria, M. Sasano, H. Sato, M. Shikata, Y. Shimizu, Y. Shindoo, L. Stuhl, T. Sumikama, Y. L. Sun, M. Tabata, Y. Togano, J. Tsubota, T. Uesaka, Z. H. Yang, J. Yasuda, K. Yoneda, J. Zenihiro
Summary: The dineutron correlation was studied in three different Borromean nuclei near the neutron dripline. The correlation angle between valence neutrons was found to be largest in the same range of intrinsic momenta, which suggests a connection to the nuclear surface. This result reinforces the prediction of universal dineutron formation in environments with low neutron density, such as the surface of neutron-rich Borromean nuclei.
Article
Astronomy & Astrophysics
H. Wang, M. Yasuda, Y. Kondo, T. Nakamura, J. A. Tostevin, K. Ogata, T. Otsuka, A. Poves, N. Shimizu, K. Yoshida, N. L. Achouri, H. Al Falou, L. Atar, T. Aumann, H. Baba, K. Boretzky, C. Caesar, D. Calvet, H. Chae, N. Chiga, A. Corsi, H. L. Crawford, F. Delaunay, A. Delbart, Q. Deshayes, Z. Dombradi, C. Douma, Z. Elekes, P. Fallon, I. Gasparic, J. M. Gheller, J. Gibelin, A. Gillibert, M. N. Harakeh, A. Hirayama, C. R. Hoffman, M. Holl, A. Horvat, A. Horvath, J. W. Hwang, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, S. Kawase, S. Kim, K. Kisamori, T. Kobayashi, D. Koerper, S. Koyama, I. Kuti, V. Lapoux, S. Lindberg, F. M. Marques, S. Masuoka, J. Mayer, K. Miki, T. Murakami, M. A. Najafi, K. Nakano, N. Nakatsuka, T. Nilsson, A. Obertelli, N. A. Orr, H. Otsu, T. Ozaki, V. Panin, S. Paschalis, A. Revel, D. Rossi, A. T. Saito, T. Saito, M. Sasano, H. Sato, Y. Satou, H. Scheit, F. Schindler, P. Schrock, M. Shikata, Y. Shimizu, H. Simon, D. Sohler, O. Sorlin, L. Stuhl, S. Takeuchi, M. Tanaka, M. Thoennessen, H. Toernqvist, Y. Togano, T. Tomai, J. Tscheuschner, J. Tsubota, T. Uesaka, Z. Yang, K. Yoneda
Summary: In this study, detailed ?-ray spectroscopy of the Ne-28 isotope was performed for the first time using the one-neutron removal reaction from 29Ne. Based on an analysis of momentum distributions, a level scheme with spin-parity assignments was constructed for Ne-28 and the negative-parity states were identified for the first time. The results indicate a breakdown of the N = 20 and N = 28 shell gaps, presenting a challenge for theoretical description of the transition in the Ne isotopic chain.
Article
Multidisciplinary Sciences
Y. Kondo, N. L. Achouri, H. Al Falou, L. Atar, T. Aumann, H. Baba, K. Boretzky, C. Caesar, D. Calvet, H. Chae, N. Chiga, A. Corsi, F. Delaunay, A. Delbart, Q. Deshayes, Zs. Dombradi, C. A. Douma, A. Ekstrom, Z. Elekes, C. Forssen, I. Gasparic, J. -M. Gheller, J. Gibelin, A. Gillibert, G. Hagen, M. N. Harakeh, A. Hirayama, C. R. Hoffman, M. Holl, A. Horvat, A. Horvath, J. W. Hwang, T. Isobe, W. G. Jiang, J. Kahlbow, N. Kalantar-Nayestanaki, S. Kawase, S. Kim, K. Kisamori, T. Kobayashi, D. Koerper, S. Koyama, I. Kuti, V. Lapoux, S. Lindberg, F. M. Marques, S. Masuoka, J. Mayer, K. Miki, T. Murakami, M. Najafi, T. Nakamura, K. Nakano, N. Nakatsuka, T. Nilsson, A. Obertelli, K. Ogata, F. de Oliveira Santos, N. A. Orr, H. Otsu, T. Otsuka, T. Ozaki, V. Panin, T. Papenbrock, S. Paschalis, A. Revel, D. Rossi, A. T. Saito, T. Y. Saito, M. Sasano, H. Sato, Y. Satou, H. Scheit, F. Schindler, P. Schrock, M. Shikata, N. Shimizu, Y. Shimizu, H. Simon, D. Sohler, O. Sorlin, L. Stuhl, Z. H. Sun, S. Takeuchi, M. Tanaka, M. Thoennessen, H. Toernqvist, Y. Togano, T. Tomai, J. Tscheuschner, J. Tsubota, N. Tsunoda, T. Uesaka, Y. Utsuno, I. Vernon, H. Wang, Z. Yang, M. Yasuda, K. Yoneda, S. Yoshida
Summary: Subjecting a physical system to extreme conditions is a common method to gain a better understanding of its organization and structure. The investigation of isotopes with different neutron-to-proton ratios than stable nuclei is an important test for nuclear-structure theories. This study reports the first observation of the decay of O-28 and 27O isotopes and compares their decay energies with theoretical models. The results have implications for the understanding of nuclear structure.
Article
Instruments & Instrumentation
J. Tanaka, R. Tsuji, K. Higuchi, H. Baba, M. Boehmer, T. Furuno, R. Gernhaeuser, Y. Hijikata, S. Ishimoto, T. Kawabata, S. Kawase, Y. Kubota, S. Kurosawa, S. Takeshige, T. Uesaka, K. Yahiro, J. Zenihiro
Summary: We have launched a new research project, ONOKORO, to study the formation mechanism of clusters in atomic nuclei. The project investigates clustering phenomena in the medium-to-heavy mass region using inverse-kinematics cluster-knockout reactions. A new detector array, TOGAXSI, is being constructed for this purpose. It measures scattering angles, energies of emitted particles, and recoil protons to achieve high-resolution cluster separation.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Instruments & Instrumentation
Y. Hijikata, J. Zenihiro, H. Baba, M. Dozono, S. Enyo, N. Fukuda, T. Harada, Y. Matsuda, S. Michimasa, D. Nishimura, S. Nishimura, S. Ota, Y. Shimizu, H. Sakaguchi, S. Sugawara, H. Suzuki, H. Takahashi, H. Takeda, S. Takeshige, J. Tanaka, S. Terashima, R. Tsuji, T. Uesaka, K. Yoshida
Summary: We have developed a gaseous Xe scintillator as a new AE detector with high radiation hardness and fast response. In this study, we tested the performance of the detector in RIBF, and found that it has an rms resolution of about 0.2 for Z=35 and 0.3 for Z=55. Additionally, it exhibits a good timing resolution of 74.4(6) ps in rms for a 238U beam.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Correction
Multidisciplinary Sciences
Y. Kondo, N. L. Achouri, H. Al Falou, L. Atar, T. Aumann, H. Baba, K. Boretzky, C. Caesar, D. Calvet, H. Chae, N. Chiga, A. Corsi, F. Delaunay, A. Delbart, Q. Deshayes, Zs. Dombradi, C. A. Douma, A. Ekstroem, Z. Elekes, C. Forssen, I. Gasparic, J. -m. Gheller, J. Gibelin, A. Gillibert, G. Hagen, M. N. Harakeh, A. Hirayama, C. R. Hoffman, M. Holl, A. Horvat, A. Horvath, J. W. Hwang, T. Isobe, W. G. Jiang, J. Kahlbow, N. Kalantar-Nayestanaki, S. Kawase, S. Kim, K. Kisamori, T. Kobayashi, D. Koerper, S. Koyama, I. Kuti, V. Lapoux, S. Lindberg, F. M. Marques, S. Masuoka, J. Mayer, K. Miki, T. Murakami, M. Najafi, T. Nakamura, K. Nakano, N. Nakatsuka, T. Nilsson, A. Obertelli, K. Ogata, F. de Oliveira Santos, N. A. Orr, H. Otsu, T. Otsuka, T. Ozaki, V. Panin, T. Papenbrock, S. Paschalis, A. Revel, D. Rossi, A. T. Saito, T. Y. Saito, M. Sasano, H. Sato, Y. Satou, H. Scheit, F. Schindler, P. Schrock, M. Shikata, N. Shimizu, Y. Shimizu, H. Simon, D. Sohler, O. Sorlin, L. Stuhl, Z. H. Sun, S. Takeuchi, M. Tanaka, M. Thoennessen, H. Toernqvist, Y. Togano, T. Tomai, J. Tscheuschner, J. Tsubota, N. Tsunoda, T. Uesaka, Y. Utsuno, I. Vernon, H. Wang, Z. Yang, M. Yasuda, K. Yoneda, S. Yoshida
Article
Physics, Nuclear
P. Pawlowski, J. Brzychczyk, N. Buyukcizmeci, H. T. Johansson, W. Trautmann, A. Wieloch, P. Adrich, T. Aumann, T. Barczyk, S. Bianchin, K. Boretzky, A. S. Botvina, A. Chbihi, J. Cibor, B. Czech, H. Emling, J. D. Frankland, M. Heil, A. Le Fevre, Y. Leifels, J. Luehning, J. Lukasik, U. Lynen, Z. Majka, I. N. Mishustin, W. F. J. Mueller, R. Ogul, H. Orth, R. Palit, D. Rossi, C. Schwarz, C. Sfienti, H. Simon, K. Suemmerer, H. Weick, B. Zwieglinski
Summary: The neutron emission in projectile fragmentation at relativistic energies was studied and found to be strongly correlated with the isotopic composition of the projectile. The statistical multifragmentation model predicts the neutron emission in peripheral collisions well, while other sources contribute to the neutron yield in central collisions.
