Article
Physics, Nuclear
C. Delafosse, A. Goasduff, A. Kankainen, D. Verney, L. Al Ayoubi, O. Beliuskina, L. Canete, T. Eronen, R. P. de Groote, M. Hukkanen, F. Ibrahim, A. Illana, A. Jaries, L. Lalanne, I. D. Moore, D. Nesterenko, H. Penttila, S. Rinta-Antila, A. de Roubin, D. Thisse, R. Thoer, G. Tocabens
Summary: The beta-delayed gamma spectroscopy of As-81 was performed using a purified beam of Ge-81 ground state. The intrinsic half-life of the Ge-81 ground state was determined to be significantly shorter than the literature value. A new level scheme of As-81 was built and compared to shell-model calculations.
EUROPEAN PHYSICAL JOURNAL A
(2022)
Article
Physics, Particles & Fields
N. E. Solonovich, N. N. Arsenyev, A. P. Severyukhin
Summary: The correlations between electric dipole polarizability, symmetry energy, and neutron skin thickness are studied using Ca-48, Ni-68, and Pb-208, which are doubly magic nuclei. The strength distribution of E1 transitions is calculated using the random phase approximation model based on the Skyrme nuclear energy density functional. By comparing with experimental data, the value of nuclear symmetry energy J = 31-38 MeV is constrained.
PHYSICS OF PARTICLES AND NUCLEI LETTERS
(2022)
Article
Physics, Multidisciplinary
Takahiro Nishi, Kenta Itahashi, DeukSoon Ahn, Georg P. A. Berg, Masanori Dozono, Daijiro Etoh, Hiroyuki Fujioka, Naoki Fukuda, Nobuhisa Fukunishi, Hans Geissel, Emma Haettner, Tadashi S. Hashimoto, Ryugo Hayano, Satoru Hirenzaki, Hiroshi Horii, Natsumi Ikeno, Naoto Inabe, Masahiko Iwasaki, Daisuke Kameda, Keichi Kisamori, Yu Kiyokawa, Toshiyuki Kubo, Kensuke Kusaka, Masafumi Matsushita, Shin'ichiro Michimasa, Go Mishima, Hiroyuki Miya, Daichi Murai, Hideko Nagahiro, Megumi Niikura, Naoko Nose-Togawa, Shinsuke Ota, Naruhiko Sakamoto, Kimiko Sekiguchi, Yuta Shiokawa, Hiroshi Suzuki, Ken Suzuki, Motonobu Takaki, Hiroyuki K. Takeda, Yoshiki Tanaka, Tomohiro Uesaka, Yasumori Wada, Atomu N. Watanabe, Yuni Watanabe, Helmut Weick, Hiroki Yamakami, Yoshiyuki Yanagisawa, Koichi Yoshida
Summary: In quantum chromodynamics, the condensation of quark-antiquark pairs breaks the chiral symmetry of vacuum. Experiments with pionic tin atoms demonstrate that the symmetry is partially restored at high densities. Vacuum is not empty and is instead filled with quark-antiquark pairs, which form a condensate due to strong interaction. This condensation, known as chiral condensate, breaks the chiral symmetry of vacuum, and its expectation value decreases at high temperatures or high matter densities where the symmetry is partially restored.
Article
Physics, Multidisciplinary
Rurie Mizuno, Megumi Niikura, Tokihiro Ikeda, Teiichiro Matsuzaki, Shintaro Go, Takeshi Y. Saito, Shin'ichiro Michimasa, Hiroyoshi Sakurai
Summary: The performance of germanium detectors for high-energy gamma-rays was evaluated. A 992-keV resonance in the Al-27(p, gamma)Si-28 reaction was used for the measurement at the RIKEN tandem accelerator. The energy of the excited state from the resonance was determined as 12540.7(2) keV. An energy calibration function and photo peak efficiency for Ge detectors up to 10.8-MeV photons were deduced using the newly determined excitation energy. The overall energy region achieved an energy accuracy of 0.3 keV. This reaction provides reliable energy and efficiency standards for high-energy gamma-rays.
PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS
(2023)
Article
Anthropology
Beda A. Hofmann, Sabine Bolliger Schreyer, Sayani Biswas, Lars Gerchow, Daniel Wiebe, Marc Schumann, Sebastian Lindemann, Diego Ramirez Garcia, Pierre Lanari, Frank Gfeller, Carlos Vigo, Debarchan Das, Fabian Hotz, Katharina von Schoeler, Kazuhiko Ninomiya, Megumi Niikura, Narongrit Ritjoho, Alex Amato
Summary: A search for meteoritic iron artefacts in the Lake of Biel area in Switzerland has led to the identification of a single object, an arrowhead, with meteoritic origin. The object's elemental composition, mineralogy, and presence of cosmogenic 26Al provide strong evidence for its meteoritic nature. This discovery is significant for understanding the use and distribution of meteoritic iron in ancient societies.
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2023)
Article
Instruments & Instrumentation
Michael Heines, Luke Antwis, Silvia Bara, Bart Caerts, Thomas E. Cocolios, Stefan Eisenwinder, Julian Fletcher, Tom Kieck, Andreas Knecht, Megumi Niikura, Narongrit Ritjoho, Lino M. C. Pereira, Randolf Pohl, Andre Vantomme, Stergiani M. Vogiatzi, Katharina von Schoeler, Frederik Wauters
Summary: Muonic x-ray spectroscopy is used to study the structure of atoms and nuclei by examining the energy levels of atomic orbitals. By utilizing implanted targets, it becomes possible to measure the absolute charge radii of long-lived radioactive isotopes that are otherwise difficult to obtain. This research provides valuable insight for laser spectroscopy with a high level of precision.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Proceedings Paper
Nuclear Science & Technology
Seiya Manabe, Yukinobu Watanabe, Megumi Niikura, Keita Nakano, Takeshi Y. Saito, Daisuke Suzuki, Yoshitaka Kawashima, Dai Tomono, Akira Sato, Hideki Harano
Summary: The energy spectra of protons, deuterons, and tritons produced by the nuclear muon capture reaction in Si-nat were measured and compared with theoretical model calculations. The measurements were consistent with previous results, and the PHITS simulation generally reproduced the measured proton spectrum but underestimated it at higher emission energies. The HUTS simulation significantly underestimated the measured energy spectra of light complex particles in the high-energy region.
15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022
(2023)
Article
Physics, Nuclear
A. M. Stefanini, G. Montagnoli, M. Del Fabbro, D. Brugnara, G. Colucci, L. Corradi, J. Diklic, E. Fioretto, F. Galtarossa, A. Goasduff, M. Mazzocco, J. Pellumaj, E. Pilotto, L. Zago, I. Zanon
Summary: The existence of fusion hindrance in light heavy-ion systems of astrophysical interest is not well established. Investigating slightly heavier cases such as C-12+ Mg-26 may provide reliable extrapolation towards the lighter systems. This study aims to search for evidence of fusion hindrance in C-12+ Mg-26 and obtain information on the underlying physics through comparison and coupled-channels calculations.
Article
Physics, Nuclear
L. G. Pedersen, E. Sahin, A. Gorgen, F. L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A. M. Bruce, S. Ceruti, F. C. L. Crespi, R. Daido, G. de Angelis, M. -C. Delattre, Zs. Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P. R. John, H. S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A. I. Morales, P. Morfouace, D. R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P. -A. Soderstrom, D. Sohler, I. G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J. J. Valiente-Dobon, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, K. Yoshinaga
Summary: Nuclei near 78Ni are significant for studying nuclear structure and changes in shell structure away from stability. For the first time, spectroscopy of the odd-odd isotope 78Cu was conducted using the EURICA setup at RIKEN Nishina Center. Excited states in the neutron-rich isotope were observed after beta decay of 78Ni produced through in-flight fission.
Article
Physics, Nuclear
B. Moon, C. -b. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P. -a. Soderstrom, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, R. Yokoyama
Summary: The beta decay of 142Te90 to 142I89 was investigated for the first time. The parent nucleus was produced by the in-flight fission of a 238U beam with an energy of 345 MeV per nucleon, impinging on a 9Be target at the Radioactive Isotope Beam Factory of RIKEN. Excited states in 142I were established by beta-delayed gamma-ray spectroscopy. The (1+) states in 142I were found to be predominantly formed by a Gamow-Teller transition between a neutron and a proton in specific orbitals.
Article
Physics, Nuclear
A. P. Severyukhin, N. N. Arsenyev
Summary: We discuss the mixing of simple and complex configurations of the giant dipole resonance in order to describe the double gamma-decay width of the 2(1)(+) state of an even-even spherical nucleus. The model used is based on the Skyrme energy density functional and takes into account a large configuration space. A prediction for the branching ratio of competitive gamma-gamma decay relative to single gamma-decay is made for the Sn-132 region of the nuclear chart.
PHYSICS OF ATOMIC NUCLEI
(2022)
Article
Physics, Nuclear
V. Girard-Alcindor, A. Mercenne, I. Stefan, F. de Oliveira Santos, N. Michel, M. Ploszajczak, M. Assic, A. Lemasson, E. Clement, F. Flavigny, A. Matta, D. Ramos, M. Rejmund, J. Dudouet, D. Ackermann, P. Adsley, M. Assuncao, B. Bastin, D. Beaumel, G. Benzoni, R. Borcea, A. J. Boston, D. Brugnara, L. Caceres, B. Cederwall, I. Celikovic, V. Chudoba, M. Ciemala, J. Collado, F. C. L. Crespi, G. D'Agata, G. De France, F. Delaunay, C. Diget, C. Domingo-Pardo, J. Eberth, C. Fougeres, S. Franchoo, F. Galtarossa, A. Georgiadou, J. Gibelin, S. Giraud, V. Gonzalez, N. Goyal, A. Gottardo, J. Goupil, S. Grevy, V. Guimaraes, F. Hammache, L. J. Harkness-Brennan, H. Hess, N. Jovancevic, D. S. Judson Oliver, O. Kamalou, A. Kamenyero, J. Kiener, W. Korten, S. Koyama, M. Labiche, L. Lalanne, V. Lapoux, S. Leblond, A. Lefevre, C. Lenain, S. Leoni, H. Li, A. Lopez-Martens, A. Maj, I. Matea, R. Menegazzo, D. Mengoni, A. Meyer, B. Million, B. Monteagudo, P. Morfouace, J. Mrazek, M. Niikura, J. Piot, Zs. Podolyak, C. Portail, A. Pullia, B. Quintana, F. Recchia, P. Reiter, K. Rezynkina, T. Roger, J. S. Rojo, F. Rotaru, M. D. Salsac, A. M. Sanchez Benitez, E. Sanchis, M. Senyigit, N. de Sereville, M. Siciliano, J. Simpson, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, D. Suzuki, C. Theisen, D. Thisse, J. C. Thomas, P. Ujic, J. J. Valiente-Dobon, M. Zielinska
Summary: The structure of the unbound F-15 nucleus was investigated by using radioactive O-14 beam and analyzing the corresponding reactions. This study confirmed the previously observed levels and discovered new resonances in F-15 nucleus. The analysis suggested that the wave functions of these resonances may be collectivized by coupling to nearby decay channels.
Article
Physics, Nuclear
A. Yagi, A. Odahara, H. Nishibata, R. Lozeva, C-B Moon, S. Nishimura, K. Yoshida, N. Yoshinaga, C. Watanabe, K. Higashiyama, T. Shimoda, R. Daido, Y. Fang, P. S. Lee, B. Moon, P. Doornenbal, G. Lorusso, P-A Soderstrom, T. Sumikama, H. Watanabe, T. Isobe, H. Baba, H. Sakurai, F. Browne, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z. Y. Xu, R. Yokoyama, T. Kubo, N. Inabe, H. Suzuki, N. Fukuda, D. Kameda, H. Takeda, D. S. Ahn, Y. Shimizu, D. Murai, F. L. Bello Garrote, J-M Daugas, F. Didierjean, E. Ideguchi, S. Iimura, T. Ishigaki, H. S. Jung, T. Komatsubara, Y. K. Kwon, C. S. Lee, S. Morimoto, M. Niikura, I Nishizuka, K. Tshoo
Summary: The structure of the neutron-rich N = 86 isotope Xe-140 was investigated using beta-gamma spectroscopy, revealing two new beta-decay isomers. Comparisons between experimental results and theoretical calculations were made to discuss the nuclear structures of low-lying states in Xe-140.
Article
Physics, Nuclear
B. Moon, A. Gargano, H. Naidja, C-B Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, M. Si, L. Sinclair, P-A Soderstrom, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, R. Yokoyama
Summary: The beta decay scheme of Te-138 and the level structure of I-138 have been reported for the first time. The experiment revealed new spin and parity assignments for I-138 based on the beta decay of Te-138. Calculation based on shell-model theory was used to discuss the proton-neutron interactions and Gamow-Teller transition strength in I-138.