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308 results on '"Tomohiro Uesaka"'

51. Experimental study of 4 n with 8He(p,2p) reaction

Author

M. Böhmer, Masaki Sasano, S. Reichert, Naohito Inabe, S. Chen, T. Shimada, M. Matsumoto, Susumu Shimoura, I. Stefan, J. Kahlbow, N. Kalantar-Nayestanaki, T. Harada, D. Symochko, István Kuti, S. W. Huang, D. Cortina, Tomohiro Uesaka, Z. Ge, N. L. Achouri, Yosuke Kondo, Hiroyuki Takeda, K. Yoneda, B. Fernández-Domínguez, U. Forsberg, Z. Elekes, Roman Gernhäuser, Y. Yasuda, H. Suzuki, Yohei Shimizu, D. Beaumel, D. Kim, C. A. Douma, Yukie Maeda, A. Hirayama, J. M. Gheller, Heiko Scheit, F. Dufter, T. Elidiano, Yasuhiro Togano, M. L. Cortés, M. Potlog, Nobuyuki Chiga, P. J. Li, Juzo Zenihiro, B. Yang, T. Isobe, M. Caamaño, Thomas Aumann, H. T. Törnqvsit, A. Gillibert, D. S. Ahn, F. Schindler, M.N. Harakeh, J. Feng, J. Tscheuschner, S. Kim, Atsumi Saito, L. Zanetti, P. Koseoglou, V. Wagner, M. Parlog, B. M. Godoy, N. Orr, Takashi Nakamura, Yu-xin Liu, J. Mayer, A. Obertelli, Yuya Kubota, Hideaki Otsu, S. Storck, S. Masuoka, K. Boretzky, Kathrin Wimmer, H. Miki, T. Tomai, F. M. Marqués, V. Panin, P. Doornenbal, Stefanos Paschalis, L. Yang, Satoshi Takeuchi, M. A. Knösel, Igor Gašparić, T. Kobayashi, C. Lehr, H. Yang, C. Lenain, M. Miwa, Z. Halász, A. Revel, H. Sato, T. Fujino, D. M. Rossi, H. Baba, S. Park, I. Murray, L. Stuhl, H. Yamada, J. Gibelin, J. Tanaka, Naoki Fukuda, RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Federal Ministry of Education and Research (Germany), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Paper, History, 010308 nuclear & particles physics, tetraneutron, nuclear force, proton knock-out, radioactive beams, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, ddc, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, ddc:530, 010306 general physics
Abstract

7 pags., 3 figs. -- 27th International Nuclear Physics Conference (INPC2019), The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or nonexistence. A new experiment based on 8 He(p,2p)7H{t+4n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system., We acknowledge the support of the RIBF accelerator staff and the BigRIPS team for providing the high-quality beam. Z. H. Yang acknowledges the financial support from the Foreign Postdoctoral Researcher program of RIKEN. T. Aumann acknowledges the support by DFG via SFB 1245. P. Koseoglou acknowledges the support from BMBF (NUSTAR.DA grant No.05P 15RDFN1).

Published
2020

52. Dynamic Nuclear Polarization of Metal–Organic Frameworks Using Photoexcited Triplet Electrons

Author

Nobuhiro Yanai, Fujiwara Saiya, Tomohiro Uesaka, Keiko Ideta, Masanori Hosoyamada, Nobuo Kimizuka, and Kenichiro Tateishi

Subjects
Thermal equilibrium, Spins, Nanoporous, Chemistry, Physics::Medical Physics, 02 engineering and technology, General Chemistry, Electron, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Biochemistry, Catalysis, 0104 chemical sciences, Pentacene, chemistry.chemical_compound, Colloid and Surface Chemistry, Deuterium, Chemical physics, Proton NMR, 0210 nano-technology
Abstract

While dynamic nuclear polarization based on photoexcited triplet electrons (triplet-DNP) has the potential to hyperpolarize nuclear spins of target substrates in the low magnetic field at room temperature, there has been no triplet-DNP system offering structural rigidity and substrate accessibility. Here, we report the first example of triplet-DNP of nanoporous metal–organic frameworks. Accommodation of a carboxylate-modified pentacene derivative in a partially deuterated ZIF-8 (D-ZIF-8) results in a clear 1H NMR signal enhancement over thermal equilibrium.

Published
2018

53. Experimental Challenges of the First Mass Measurement Campaign at the Rare-RI Ring

Author

NAIMI, Sarah, Fu Li, Hong, Abe, Yasushi, Yamaguchi, Yoshitaka, Nagae, Daisuke, Suzaki, Fumi, Wakasugi, Masanori, Arakawa, Hiroki, Tou, Fumihiro, Hamakawa, Daiki, Hosoi, Shun, Inada, Yasuto, Inomata, Kumi, Kajiki, Daisuke, Kobayashi, Takaaki, Sakaue, Mamoru, Yokota, Kenjiro, Yamaguchi, Takayuki, Kaagesawa, Leo, Kamioka, Daiki, Moriguchi, Tetsuaki, Mukai, Momo, Ozawa, Akira, Oota, Shinsuke, Kitamura, Noritaka, Masuoka, Syoichiro, Michimasa, Shinichiro, Ahn, DeukSoon, Baba, Hidetada, Fukuda, Naoki, Shimizu, Yohei, Suzuki, Hiroshi, Takeda, Hiroyuki, Y. Fu, C., Zhuang, Ge, Suzuki, Shinji, Wang, Quan, Wang, Meng, Litvinov, Yury, Lorusso, Giuseppe, Uesaka, Tomohiro, Yasushi, Abe, Yoshitaka, Yamaguchi, Daisuke, Nagae, Fumi, Suzaki, Daiki, Hamakawa, Shun, Hosoi, Yasuto, Inada, Daisuke, Kajiki, Takaaki, Kobayashi, Mamoru, Sakaue, Kenjiro, Yokota, Takayuki, Yamaguchi, Leo, Kaagesawa, Tetsuaki, Moriguchi, Momo, Mukai, Akira, Ozawa, Shinsuke, Oota, Shinichiro, Michimasa, Hidetada, Baba, Naoki, Fukuda, Yohei, Shimizu, Hiroshi, Suzuki, Hiroyuki, Takeda, Shinji, Suzuki, Tomohiro, Uesaka, NAIMI, Sarah, Fu Li, Hong, Abe, Yasushi, Yamaguchi, Yoshitaka, Nagae, Daisuke, Suzaki, Fumi, Wakasugi, Masanori, Arakawa, Hiroki, Tou, Fumihiro, Hamakawa, Daiki, Hosoi, Shun, Inada, Yasuto, Inomata, Kumi, Kajiki, Daisuke, Kobayashi, Takaaki, Sakaue, Mamoru, Yokota, Kenjiro, Yamaguchi, Takayuki, Kaagesawa, Leo, Kamioka, Daiki, Moriguchi, Tetsuaki, Mukai, Momo, Ozawa, Akira, Oota, Shinsuke, Kitamura, Noritaka, Masuoka, Syoichiro, Michimasa, Shinichiro, Ahn, DeukSoon, Baba, Hidetada, Fukuda, Naoki, Shimizu, Yohei, Suzuki, Hiroshi, Takeda, Hiroyuki, Y. Fu, C., Zhuang, Ge, Suzuki, Shinji, Wang, Quan, Wang, Meng, Litvinov, Yury, Lorusso, Giuseppe, Uesaka, Tomohiro, Yasushi, Abe, Yoshitaka, Yamaguchi, Daisuke, Nagae, Fumi, Suzaki, Daiki, Hamakawa, Shun, Hosoi, Yasuto, Inada, Daisuke, Kajiki, Takaaki, Kobayashi, Mamoru, Sakaue, Kenjiro, Yokota, Takayuki, Yamaguchi, Leo, Kaagesawa, Tetsuaki, Moriguchi, Momo, Mukai, Akira, Ozawa, Shinsuke, Oota, Shinichiro, Michimasa, Hidetada, Baba, Naoki, Fukuda, Yohei, Shimizu, Hiroshi, Suzuki, Hiroyuki, Takeda, Shinji, Suzuki, and Tomohiro, Uesaka

Abstract

With the recent commissioning of the Rare-RI Ring (R3), nuclear mass measurement of rare isotopes (RIs) produced at the RI Beam Factory (RIBF) at RIKEN has become possible. The R3 spectrometer is based on the Isochronous Mass Spectrometry technique that allows for reaching a mass measurement precision of 10−6 within less than 1 ms. With the newly established self-triggered individual injection method, R3 specialized in mass measurements of extremely short-lived nuclei with low production yields. In this paper, we report the first mass measurement campaign conducted at the R3 addressing nuclei in the vicinity of N=50 and N=82 neutron magic numbers, with a particular focus on the challenges of this new facility.

Published
2020

54. Spectroscopy of 2565,67Mn: Strong coupling in the N = 40 'island of inversion'

Author

K. Matsui, H. Otsu, W.Q. Zhang, J.-Y. Roussé, Tadaaki Isobe, R. Lozeva, X.H. Zhou, Satoshi Takeuchi, X.Y. Liu, E. Sahin, Shunpei Koyama, P. Doornenbal, S. Franchoo, Zs. Dombradi, F. Nowacki, Shuichi Ota, C. Santamaria, A. Obertelli, A. Gottardo, Daisuke Suzuki, K. Hadynska-Klek, Jin Wu, L. X. Chung, Masaki Sasano, Ryo Taniuchi, Hiroyoshi Sakurai, Jenny Lee, K. Yoneda, Megumi Niikura, H.S. Xu, P. A. Söderström, C. Louchart, T. Motobayashi, Tomohiro Uesaka, Yuya Kubota, C. Péron, Tsuyoshi Miyazaki, H. Lu, G. Authelet, G. L. Stefan, V. Werner, B. D. Linh, F. Château, A. Delbart, J. M. Gheller, A. Gillibert, C. M. Shand, H. Wang, Z. Liu, S. Nishimura, Zs. Vajta, Philip M Walker, Masafumi Matsushita, Satoru Momiyama, M. Lettmann, F. Browne, S. M. Lenzi, Yoshiaki Shiga, Toshiyuki Sumikama, L. Olivier, E. C. Pollacco, Feng-Shou Zhang, F. Giacoppo, David Steppenbeck, V. Lapoux, T.H. Huang, Zena Patel, H. Baba, M. D. Sun, Y.H. Zhang, D. Calvet, Zhengyu Xu, Alan Peyaud, B. Ding, A. Corsi, Z. Korkulu, Y.H. Lam, and De-fu Hou

Subjects
Physics, Coupling, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Island of inversion, Nuclear structure, Decoupling (cosmology), 01 natural sciences, Molecular physics, Excited state, 0103 physical sciences, Neutron, 010306 general physics, Spectroscopy, Line (formation)
Abstract

Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2 g.s.− level sequence, connected by I→I−1 transitions, were established, the first time for 65,67Mn. Their level structures show features consistent with strongly-coupled rotational bands with K=5/2 . State-of-the-art shell-model calculations with the modified LNPS effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass 53−67Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the β stability line. These results help to deepen our understanding of the N=40 “island of inversion”.

Published
2018

55. Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and νp nucleosynthesis processes

Author

Akira Ozawa, X. C. Chen, J.C. Yang, Thomas Rauscher, Y. M. Xing, Y. H. Lam, Meng Wang, T. Bao, Tomohiro Uesaka, Xiao-Lin Tu, W.J. Huang, A. Sieverding, Yu. A. Litvinov, Shigeru Kubono, X.W. Ma, Klaus Blaum, Friedrich-Karl Thielemann, Yang Sun, M. Si, Y. Yamaguchi, M. Z. Sun, Xiang Zhou, Furong Xu, P. Shuai, Jun-Hao Liu, Bao-Hua Sun, You-Jin Yuan, C. Y. Fu, R.J. Chen, Takayuki Yamaguchi, Xiaojuan Zhou, S. Wanajo, X.D. Tang, Pengming Zhang, H. S. Xu, Hong Li, W. L. Zhan, A. C. Dai, Yuhu Zhang, X. L. Yan, G. Audi, Ruishi Mao, Sergey Litvinov, Qun Wang, B S Gao, Carla Fröhlich, Xurong Xu, Qin Zeng, J. J. He, K. A. Li, Gabriel Martínez-Pinedo, Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Proton, Atomic masses, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], chemistry.chemical_element, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], νp-Process, 01 natural sciences, 7. Clean energy, Nuclear physics, Nucleosynthesis, 0103 physical sciences, Neutron, ddc:530, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Isotope, 010308 nuclear & particles physics, Isochronous mass spectrometry, rp-process, rp -Process, Atomic mass, lcsh:QC1-999, rp-Process, Ion storage ring, chemistry, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Molybdenum, νp -Process, Präzisionsexperimente - Abteilung Blaum, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Storage ring, lcsh:Physics
Abstract

Using isochronous mass spectrometry at the experimental storage ring CSRe in Lanzhou, the masses of $^{82}$Zr and $^{84}$Nb were measured for the first time with an uncertainty of $\sim 10$ keV, and the masses of $^{79}$Y, $^{81}$Zr, and $^{83}$Nb were re-determined with a higher precision. %The latter differ significantly from their literature values. The latter are significantly less bound than their literature values. Our new and accurate masses remove the irregularities of the mass surface in this region of the nuclear chart. Our results do not support the predicted island of pronounced low $\alpha$ separation energies for neutron-deficient Mo and Tc isotopes, making the formation of Zr-Nb cycle in the $rp$-process unlikely. The new proton separation energy of $^{83}$Nb was determined to be 490(400)~keV smaller than that in the Atomic Mass Evaluation 2012. This partly removes the overproduction of the $p$-nucleus $^{84}$Sr relative to the neutron-deficient molybdenum isotopes in the previous $\nu p$-process simulations.

Published
2018

56. Shell evolution beyond Z = 28 and N = 50: Spectroscopy of 81,82,83,84 Zn

Author

L. Olivier, K. Moschner, Kathrin Wimmer, E. C. Pollacco, A. Gillibert, C. R. Nita, C. M. Shand, J.-Y. Roussé, Satoru Momiyama, M. Lettmann, Jian Liu, A. Jungclaus, Hideaki Otsu, Z. Korkulu, Ryo Taniuchi, C. Péron, David Steppenbeck, A. Blazhev, Tsuyoshi Miyazaki, G. Authelet, K. Matsui, Satoshi Takeuchi, A. Château, A. Obertelli, F. Nowacki, S. Franchoo, Kamila Sieja, Toshiaki Ando, J. M. Gheller, Alan Peyaud, Jin Wu, L. X. Chung, Shuichi Ota, C. R. Nobs, B. D. Linh, Zs. Vajta, Y. Kubota, Megumi Niikura, M. Rudigier, I. Stefan, H. Wang, R. Orlandi, J. A. Tostevin, Takaharu Otsuka, Si-Ge Chen, P. A. Söderström, Tomohiro Uesaka, C. Lizarazo, S. Nishimura, Zs. Dombradi, Toshiyuki Sumikama, K. Hadynska-Klek, M. Nagamine, Yusuke Tsunoda, T. Isobe, E. Sahin, C. Louchart, Hiroyoshi Sakurai, V. Lapoux, C. Santamaria, T. Motobayashi, Victor Vaquero, F. Giacoppo, T. Arici, A. Corsi, Zena Patel, P. Doornenbal, Masafumi Matsushita, A. Delbart, P. H. Regan, M. Dewald, Zsolt Podolyak, A. Giganon, A. Gottardo, Jenny Lee, F. Flavigny, M. Górska, N. Paul, Noritsugu Nakatsuka, M. L. Cortés, Zi Hong Liu, V. Werner, Raymond J. Carroll, Daisuke Suzuki, D. Calvet, M. Sasano, Bing Ding, Shoko Koyama, Zhengyu Xu, T. Saito, Alison Bruce, R. Lozeva, K. Yoneda, F. Browne, H. Baba, Yoshiaki Shiga, SCOAP, RIKEN Nishina Center for Accelerator-Based Science, Science and Technology Facilities Council (UK), European Commission, European Research Council, Vietnam Academy of Science and Technology, Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, SHELL model, Analytical chemistry, Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, lcsh:QC1-999, Atomic orbital, Neutron number, 0103 physical sciences, ddc:530, Atomic physics, 010306 general physics, Spectroscopy, lcsh:Physics
Abstract

C.M. Shand et al. -- 6 pags., 3 figs., tab. --Open Access funded by Creative Commons Atribution Licence 4.0, We report on the measurement of new low-lying states in the neutron-rich Zn nuclei via in-beam γ-ray spectroscopy. These include the 4 →2 transition in Zn, the 2 →0 and 4 →2 transitions in Zn, and low-lying states in Zn were observed for the first time. The reduced E(2 ) energies and increased E(4 )/E(2 ) ratios at N=52, 54 compared to those in Zn attest that the magicity is confined to the neutron number N=50 only. The deduced level schemes are compared to three state-of-the-art shell model calculations and a good agreement is observed with all three calculations. The newly observed 2 and 4 levels in Zn suggest the onset of deformation towards heavier Zn isotopes, which has been incorporated by taking into account the upper sdg orbitals in the Ni78-II and the PFSDG-U models., All UK authors are supported by the Science and Technology Facilities Council (STFC). The development of MINOS and the core MINOS team have been supported by the European Research Council through the ERC Grant No. MINOS-258567. A. Jungclaus was supported by the Spanish Ministerio de Economía y Competitividad under contract FPA2014-57196-C5-4-P. Authors from Cologne were supported by German BMBF Grant No. 05P15PKFNA. Authors from TU Darmstadt were supported by German BMBF Grant No. 05P12RDFN8 and 05P15RDFN1. L.X. Chung and B.D. Linh would like to acknowledge Vietnam Ministry of Science and Technology for the support, and Radioactive Isotope Physics Laboratory of the RIKEN Nishina Center for supporting their stay during the experiments.

Published
2017

57. PANDORA, a large volume low-energy neutron detector with real-time neutron–gamma discrimination

Author

Tomohiro Uesaka, H. Baba, Kentaro Yako, J. Yasuda, L. Stuhl, Masaki Sasano, and Shuichi Ota

Subjects
Physics, Nuclear and High Energy Physics, Spectrum analyzer, Isotope, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Scintillator, 01 natural sciences, Nuclear physics, Time of flight, Physics::Space Physics, 0103 physical sciences, Figure of merit, Neutron detection, Neutron, 010306 general physics, Instrumentation
Abstract

The PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) system, which was developed for use in inverse kinematics experiments with unstable isotope beams, is a neutron detector based on a plastic scintillator coupled to a digital readout. PANDORA can be used for any reaction study involving the emission of low energy neutrons (100 keV–10 MeV) where background suppression and an increased signal-to-noise ratio are crucial. The digital readout system provides an opportunity for pulse shape discrimination (PSD) of the detected particles as well as intelligent triggering based on PSD. The figure of merit results of PANDORA are compared to the data in literature. Using PANDORA, 91 ± 1 % of all detected neutrons can be separated, while 91 ± 1 % of the detected gamma rays can be excluded, reducing the gamma ray background by one order of magnitude.

Published
2017

58. First measurement of isoscalar giant resonances in a stored-beam experiment

Author

I. Dillmann, V. K. Eremin, J. C. Zamora, M. Thürauf, Helmut Weick, M. Mahjour-Shafiei, Manfred Mutterer, Hans Geissel, S. Bagchi, Peter Egelhof, M. Kuilman, M. A. Najafi, D. Nagae, P. J. Woods, Tomohiro Uesaka, Catherine Rigollet, Yu. A. Litvinov, Takayuki Yamaguchi, Th. Kröll, Roman Gernhäuser, C. Nociforo, B. Streicher, Christoph Scheidenberger, Sergey Litvinov, M. Steck, C. Kozhuharov, F. Nolden, L. Stuhl, M.N. Harakeh, Danyal Winters, H. Kollmus, K. Yue, A.-L. Hartig, S. Ilieva, Santosh Roy, S. Bönig, M. Csatlós, Tatsuya Furuno, M. von Schmid, O. Kiselev, Nasser Kalantar-Nayestanaki, Thomas Aumann, Juzo Zenihiro, A. Krasznahorkay, U. Popp, J. S. Winfield, C. Dimopoulou, Research unit Nuclear & Hadron Physics, Theory of Condensed Matter, and Research unit Astroparticle Physics

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Isoscalar, Nuclear Theory, 01 natural sciences, Nuclear physics, INELASTIC ALPHA-SCATTERING, ENERGY, 0103 physical sciences, EXCITATION, NI-58, PARTICLES, Neutron, ddc:530, 010306 general physics, Nuclear Experiment, Physics, NUCLEI, 010308 nuclear & particles physics, Momentum transfer, Resonance, lcsh:QC1-999, Inverse kinematics, Physics::Accelerator Physics, Isoscalar giant resonances, NEUTRON, Sum rule in quantum mechanics, DIPOLE RESONANCE, Atomic physics, Storage ring, Beam (structure), lcsh:Physics, MONOPOLE STRENGTH
Abstract

Physics letters / B 763, 16 - 19 (2016). doi:10.1016/j.physletb.2016.10.015, Published by North-Holland Publ., Amsterdam

Published
2016

59. Masses of ground and isomeric states of In101 and configuration-dependent shell evolution in odd- A indium isotopes

Author

R.J. Chen, X. H. Zhou, Yoshitaka Yamaguchi, Qingqi Zeng, Takayuki Yamaguchi, M. Si, Y. M. Xing, Y. H. Lam, Qun-Yao Wang, X. C. Chen, Yu. A. Litvinov, Bingshui Gao, M. Z. Sun, Shigeru Kubono, Y. H. Zhang, G. Audi, C. X. Yuan, You-Jin Yuan, C. Y. Fu, M. Wang, Klaus Blaum, S. Naimi, Xiao-Lin Tu, Yu Sun, Xurong Xu, W. L. Zhan, X. K. Zhou, Jiayu Liu, Ping Shuai, Kazunari Kaneko, Sergey Litvinov, Jiuyang He, X. L. Yan, Bao-Hua Sun, Ming-Zheng Liu, Xiu-Wen Ma, Tomohiro Uesaka, A. Ozawa, Hongfu Li, H. S. Xu, J.C. Yang, Pengli Zhang, and Furong Xu

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, Shell (structure), chemistry.chemical_element, 01 natural sciences, chemistry, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Particle, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Magic number (physics), Indium, Excitation, Mixing (physics)
Abstract

We report first precision mass measurements of the $1/2^-$ isomeric and $9/2^+$ ground states of $^{101}$In. The determined isomeric excitation energy continues a smooth trend of odd-$A$ indium isotopes up to the immediate vicinity of $N=50$ magic number. This trend can be confirmed by dedicated shell model calculations only if the neutron configuration mixing is considered. We find that the single particle energies are different for different states of the same isotope. The presented configuration-dependent shell evolution, type II shell evolution, in odd-$A$ nuclei is discussed for the first time. Our results will facilitate future studies of single-particle neutron states.

Published
2019

60. Spin Studies of the Short-Range Correlations with Polarized Beams at JINR-Nuclotron

Author

S. G. Reznikov, A. A. Terekhin, Olena Mezhenska, Eugene V. Chernykh, S. M. Piyadin, D. Enache, J. T. Karachuk, Alexander V. Averyanov, N. B. Ladygina, Tomohiro Uesaka, P. K. Kurilkin, A. N. Livanov, A. N. Khrenov, Yaroslav T. Skhomenko, D. O. Krivenkov, Yury Gurchin, Marian Janek, V. P. Ladygin, A. V. Tishevsky, and Alexander Isupov

Subjects
Physics, Nuclear physics, Range (particle radiation), Nuclotron, Spin-½
Published
2019

61. Quasifree Neutron Knockout from Ca54 Corroborates Arising N=34 Neutron Magic Number

Author

V. Wagner, V. Somà, F. Flavigny, K. Moschner, S. Y. Park, V. Panin, Kathrin Wimmer, M. MacCormick, S. Takeuchi, M. L. Cortés, S. Franchoo, Hideaki Otsu, D. Calvet, D. M. Rossi, Toshio Kobayashi, K. Yoneda, Tomohiro Uesaka, Masaki Sasano, T. Lokotko, P. Koseoglou, Dóra Sohler, H. Baba, N. Paul, P. A. Söderström, David Steppenbeck, Nobuyuki Chiga, E. Sahin, Petr Navrátil, Thomas Aumann, Takashi Nakamura, F. Browne, S. J. Chen, Donghang Yan, V. Werner, T. Isobe, R.-B. Gerst, P. Doornenbal, T. Koiwai, F. Château, A. Corsi, A. Gillibert, Takaharu Otsuka, Hiroyoshi Sakurai, A. Delbart, F. Raimondi, H. Yamada, Shuopei Wang, Y. L. Sun, Victor Vaquero, T. Motobayashi, L. X. Chung, H. Törnqvist, J. M. Gheller, Yasuhiro Togano, W. Rodriguez, Y. Chazono, A. Giganon, Carlo Barbieri, Kazuyuki Ogata, C. Lehr, Masahiro Yasuda, C. Hilaire, N. L. Achouri, Yosuke Kondo, Julien Gibelin, X. X. Xu, B. D. Linh, J. Kahlbow, Igor Gašparić, H. N. Liu, A. Obertelli, L. Zanetti, Yutaka Utsuno, Jenny Lee, Yuya Kubota, V. Lapoux, K. Yoshida, Dong-Wook Kim, O. Aktas, Zaihong Yang, I. Murray, K. I. Hahn, and L. Stuhl

Subjects
Physics, Hydrogen, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, Impulse (physics), 01 natural sciences, Vertex (geometry), Isotopes of calcium, Transverse plane, chemistry, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Excitation
Abstract

Exclusive cross sections and momentum distributions have been measured for quasifree one-neutron knockout reactions from a ^{54}Ca beam striking on a liquid hydrogen target at ∼200 MeV/u. A significantly larger cross section to the p_{3/2} state compared to the f_{5/2} state observed in the excitation of ^{53}Ca provides direct evidence for the nature of the N=34 shell closure. This finding corroborates the arising of a new shell closure in neutron-rich calcium isotopes. The distorted-wave impulse approximation reaction formalism with shell model calculations using the effective GXPF1Bs interaction and ab initio calculations concur our experimental findings. Obtained transverse and parallel momentum distributions demonstrate the sensitivity of quasifree one-neutron knockout in inverse kinematics on a thick liquid hydrogen target with the reaction vertex reconstructed to final state spin-parity assignments.

Published
2019

62. Dynamic nuclear polarization with photo-excited triplet electrons using 6,13-diphenylpentacene

Author

Masahiro Kitagawa, Tomohiro Uesaka, Makoto Negoro, Satoshi Wada, Kenichiro Tateishi, Akinori Kagawa, Hiroshi Nonaka, and Shinsuke Sando

Subjects
Materials science, Spins, Doping, General Physics and Astronomy, 02 engineering and technology, Electron, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, 0104 chemical sciences, Pentacene, chemistry.chemical_compound, chemistry, Excited state, Physical and Theoretical Chemistry, Solubility, 0210 nano-technology, Polarization (electrochemistry)
Abstract

Dynamic nuclear polarization with photo-excited triplet electrons (Triplet-DNP) is demonstrated using 6,13-diphenylpentacene (DPPentacene). DPPentacene is soluble in various organic solvents, while pentacene, which is used in most of the triplet-DNP experiments, has limited solubility. An enhancement factor of 81 is obtained for 1H spins in the glass of ethanol-d6 : water = 80 : 20 (w/w) doped with 0.1 mM DPPentacene at 90 K in 0.67 T.

Published
2019

63. Scheme of high-resolution identification and selection of secondary ions for mass measurements with the Rare-RI Ring

Author

Yasushi Abe, Akira Ozawa, Masanori Wakusugi, Yasuto Inada, Kiyoshi Wakayama, Takaaki Kobayashi, Yoshitaka Yamaguchi, Takayuki Yamaguchi, Shun Hosoi, Kunimitsu Nishimuro, Hongfu Li, S. Omika, S. Naimi, M. Amano, M. Mukai, F. Suzaki, Yasushige Yano, Tetsuaki Moriguchi, Shinji Suzuki, Daiki Kamioka, Kumi Inomata, Z. Ge, Tomohiro Uesaka, Daisuke Nagae, and Hiroki Arakawa

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Fission, Separator (oil production), Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Ion, Nuclear physics, Achromatic lens, law, Isochronous mass spectrometry, 0103 physical sciences, Nuclide, Physical and Theoretical Chemistry, 010306 general physics, Beam (structure)
Abstract

To achieve high-resolution selection and separation of mono-isotopic beams through projectile fragmentation or in-flight fission and to efficiently transport the secondary beams to the Rare-RI Ring (R3) for mass determination, the BigRIPS separator combined with the High-resolution Achromatic (HA) beam-line of SHARAQ is served as a two-stage separator. The first stage from F0 to F2 is used for separation of the nuclei of interest through a Bρ-ΔE-Bρ method and the second stage from F3 to S0 is employed for identification of the beam with a Bρ-ΔE-TOF method. With this scheme, all the secondary ions can be well separated on an event by event basis and be utilized for mass measurements by two complementary methods: the conventional magnetic-rigidity-time-of-flight (Bρ-TOF) method employing the BigRIPS-HA beam-line to measure exotic nuclides within 1 μ s and the newly established isochronous mass spectrometry (IMS) approach via the R3 with a measurement duration less than 1 ms. This report presents the technique advances of the BigRIPS-HA-SHARAQ-R3 as a separator/spectrometer and give a brief description of its application to the complementary TOF methods for mass measurements at RIBF.

Published
2019

64. Spin studies of the short-range correlations at Nuclotron

Author

Alexander Isupov, E. V. Chernykh, J. T. Karachuk, Yuri V. Gurchin, P. K. Kurilkin, Alexei V. Tishevsky, N. B. Ladygina, Alexei N. Livanov, D. Enache, Olena Mezhenska, A. N. Khrenov, S. M. Piyadin, Alexander V. Averyanov, D. O. Krivenkov, V. P. Ladygin, Yaroslav T. Skhomenko, Marian Janek, S. G. Reznikov, Tomohiro Uesaka, and A. A. Terekhin

Subjects
Physics, Nuclear physics, Range (particle radiation), Nuclotron, Spin-½
Published
2019

65. Triplet dynamic nuclear polarization of nanocrystals dispersed in water at room temperature

Author

Kenichiro Tateishi, Koki Nishimura, Tomohiro Uesaka, Keiko Ideta, Hironori Kouno, Nobuhiro Yanai, and Nobuo Kimizuka

Subjects
Materials science, Physics::Medical Physics, General Physics and Astronomy, 02 engineering and technology, Electron, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Molecular physics, 0104 chemical sciences, Nanocrystal, Physical and Theoretical Chemistry, 0210 nano-technology, Bulk crystal
Abstract

While dynamic nuclear polarization using photo-excited triplet electrons (triplet-DNP) can improve the sensitivity of nuclear magnetic resonance at room temperature, it has not been carried out in water. Here, we report the first example of triplet-DNP in water by downsizing the conventional bulk crystals to nanocrystals.

Published
2019

66. $\alpha$-clustering in Heavy Nuclei $^{112–124}$Sn Probed with $(p,p\alpha )$ Reaction

Author

P. Schrock, Tomohiro Uesaka, Dmytro Symochko, Junki Tanaka, Heiko Scheit, Yuki Fujikawa, Fabia Schindler, Yuki Kubota, Didier Beaumel, Marco Knösel, Kazuyuki Ogata, V. Wagner, S. N. Nakamura, Atsushi Tamii, Jianlin Lou, A. Inoue, S. Adachi, Jiaxing Han, Shi-Wei Bai, Thomas Aumann, Kenjiro Miki, Yukie Maeda, Juzo Zenihiro, Wei Liu, Ying Jiang, Zaihong Yang, Siwei Huang, Stefan Typel, Patrick van Beek, Nobuyuki Kobayashi, Yohei Matsuda, V. Panin, Kazuki Yoshida, Sebastian Heil, Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Stereochemistry, 0103 physical sciences, Alpha (ethology), 010306 general physics, Cluster analysis, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], 7. Clean energy, 01 natural sciences
Abstract

International audience; We measured the α-clustering strength at the surface of tin isotopes ^112,116,120,124Sn by using quasi-free \((p,p\alpha )\) reaction at RCNP. Formation of α clusters at the surface of tin isotopes was clearly evidenced from our results. Surface α-clustering in heavy nuclei provides a natural explanation for the origin of α particles in α decay, and may also impact the neutron-skin thickness which plays a critical role in constraining the nuclear symmetry energy.

Published
2019

67. Masses of neutron-rich Sc52–54 and Ti54,56 nuclides: The N=32 subshell closure in scandium

Author

Ruishi Mao, Sergey Litvinov, Yu. A. Litvinov, Y. M. Xing, Y. H. Lam, Xurong Xu, Xiao-Lin Tu, G. Audi, J. Simonis, Tomohiro Uesaka, Jason D. Holt, Klaus Blaum, H. S. Xu, X. C. Chen, Ping Shuai, Hai-Hui Zhao, A. Ozawa, M. Wang, X. L. Yan, Furong Xu, R.J. Chen, W. J. Huang, X. H. Zhou, C. Y. Fu, Qingqi Zeng, Z. Ge, S. R. Stroberg, W. L. Zhan, Y. H. Zhang, Di Liu, Takayuki Yamaguchi, T. C. Zhao, Yoshitaka Yamaguchi, Bao-Hua Sun, Xiu-Wen Ma, Achim Schwenk, W. Zhang, Yu Sun, and Guang-Cheng Xiao

Subjects
Physics, Mass excess, Isotope, 010308 nuclear & particles physics, Nuclear structure, chemistry.chemical_element, 7. Clean energy, 01 natural sciences, Atomic mass, chemistry, 0103 physical sciences, Neutron, Nuclide, Scandium, Atomic physics, 010306 general physics, Magic number (physics)
Abstract

Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the neutron-rich Sc52–54 and Ti54,56 nuclei. The new mass excess values ME(Sc52)=−40525(65) keV, ME(Sc53)=−38910(80) keV, and ME(Sc54)=−34485(360) keV, deviate from the Atomic Mass Evaluation 2012 by 2.3σ, 2.8σ, and 1.7σ, respectively. These large deviations significantly change the systematics of the two-neutron separation energies of scandium isotopes. The empirical shell gap extracted from our new experimental results shows a significant subshell closure at N=32 in scandium, with a similar magnitude as in calcium. Moreover, we present ab initio calculations using the valence-space in-medium similarity renormalization group based on two- and three-nucleon interactions from chiral effective field theory. The theoretical results confirm the existence of a substantial N=32 shell gap in Sc and Ca with a decreasing trend towards lighter isotones, thus providing a consistent picture of the evolution of the N=32 magic number from the pf into the sd shell.

Published
2019

68. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author

A. Corsi, V. Lapoux, Zs. Dombradi, K. Matsui, David Steppenbeck, A. Gillibert, Alan Peyaud, Shoko Koyama, Toshiaki Ando, C. M. Shand, Hiroyoshi Sakurai, M. Rudigier, F. Browne, L. Olivier, Raymond J. Carroll, K. Yoneda, E. Sahin, Yoshiaki Shiga, Bing Ding, F. Château, Pieter Doornenbal, Hidetada Baba, Tomoyuki Saito, Tohru Motobayashi, Zs. Podolyák, Satoru Momiyama, F. Giacoppo, C. R. Nita, T. Sumikama, H. Wang, Megumi Niikura, A. Gottardo, Jenny Lee, M. Dewald, Zs. Vajta, R. Orlandi, Shuichi Ota, E. C. Pollacco, K. Hadynska-Klek, F. Flavigny, P. A. Söderström, Daisuke Suzuki, Yuya Kubota, C. Lizarazo, D. Calvet, S. Nagamine, C. Péron, Tomohiro Uesaka, R. Lozeva, Hideaki Otsu, N. Paul, Shenjian Chen, G. Authelet, Noritsugu Nakatsuka, Ryo Taniuchi, A. Delbart, Carlos A. Bertulani, J. M. Gheller, Zi Hong Liu, V. Werner, T. Arici, M. Matsushita, Masaki Sasano, M. Lettmann, B. D. Linh, C. Santamaria, Alison Bruce, J. L. Rodriguez-Sanchez, Satoshi Takeuchi, I. Stefan, M. Górska, S. Franchoo, C. Louchart, Zhengyu Xu, Zena Patel, J.-Y. Roussé, Tadaaki Isobe, S. Nishimura, A. Jungclaus, Victor Vaquero, T. Miyazaki, M. L. Cortés, A. Obertelli, K. Moschner, Kathrin Wimmer, Z. Korkulu, Jin Wu, L. X. Chung, C. R. Nobs, Jian Liu, A. Blazhev, and A. Giganon

Subjects
Physics, Hydrogen, Proton, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Cascade, Pairing, 0103 physical sciences, Bound state, Physics::Accelerator Physics, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract

Fifty-five inclusive single nucleon removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at � 250 MeV/nucleon were measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semi-microscopic model predictions,highlighting the enhanced role of low-lying level densities in nucleon removal cross sections from loosely-bound nuclei.

Published
2019

69. Nonpentacene Polarizing Agents with Improved Air Stability for Triplet Dynamic Nuclear Polarization at Room Temperature

Author

Kenichiro Tateishi, Yusuke Kawashima, Tomohiro Uesaka, Nobuhiro Yanai, Hironori Kouno, and Nobuo Kimizuka

Subjects
Materials science, Spins, 02 engineering and technology, Electron, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), 01 natural sciences, Molecular physics, 0104 chemical sciences, Signal enhancement, Pentacene, Condensed Matter::Materials Science, chemistry.chemical_compound, Tetracene, chemistry, Proton NMR, General Materials Science, Physics::Chemical Physics, Physical and Theoretical Chemistry, 0210 nano-technology, HOMO/LUMO
Abstract

Triplet dynamic nuclear polarization (triplet-DNP), a method to enhance nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) sensitivity using photoexcited triplet electrons, has great potential to hyperpolarize nuclear spins at room temperature. Since the first report of room-temperature triplet-DNP in 1990, pentacene has been the only and best option of triplet polarizing agent. However, the poor air stability of pentacene has severely limited the applicability of triplet-DNP. We report the first example of polarizing agents with significant air stability as well as high polarizing ability comparable to pentacene. The introduction of electron-withdrawing diaza-substitution to pentacene and tetracene reduces the lowest unoccupied molecular orbital level and endows much improved stability under the ambient conditions. Importantly, the diaza-substituted pentacene and tetracene offer similar, or even slightly better, 1H NMR signal enhancement compared with pentacene in the prototypical trip...

Published
2019

70. How Robust is the N=34 Subshell Closure? First Spectroscopy of Ar52

Author

Nobuyuki Chiga, T. Lokotko, Si Chen, T. Koiwai, Takashi Nakamura, D. Calvet, K. Moschner, E. Sahin, Yosuke Kondo, A. Corsi, N.L. Achouri, Kathrin Wimmer, T. Kobayashi, F. Browne, X. X. Xu, David Steppenbeck, B. D. Linh, A. Delbart, J. M. Gheller, V. Wagner, H. Törnqvist, P. Doornenbal, M. MacCormick, R.-B. Gerst, Igor Gašparić, C. Lehr, Hiroyoshi Sakurai, Masahiro Yasuda, C. Hilaire, H.N. Liu, A. Giganon, F. Flavigny, M. L. Cortés, T. Motobayashi, S. Franchoo, Thomas Aumann, C.A. Bertulani, A. Gillibert, V. Panin, Hideaki Otsu, L. X. Chung, P. A. Söderström, Gustav R. Jansen, Hirofumi Yamada, Masaki Sasano, R. Stroberg, D. Sohler, Julien Gibelin, L. Zanetti, Victor Vaquero, V. Lapoux, T. Isobe, N. Paul, S. Wang, Yasuhiro Togano, Jenny Lee, Achim Schwenk, Yuya Kubota, Satoshi Takeuchi, V. Werner, A. Obertelli, F. Château, P. Koseoglou, Gaute Hagen, Dong-Wook Kim, O. Aktas, Zaihong Yang, I. Murray, K. I. Hahn, L. Stuhl, Jason D. Holt, Tomohiro Uesaka, K. Yoneda, S. Y. Park, Duo Yan, D. M. Rossi, H. Baba, Y. L. Sun, T. D. Morris, and W. Rodriguez

Subjects
Physics, Isotope, Closure (topology), General Physics and Astronomy, 01 natural sciences, 3. Good health, Neutron number, 0103 physical sciences, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Nuclear theory, Excitation, Energy (signal processing)
Abstract

The first γ-ray spectroscopy of ^{52}Ar, with the neutron number N=34, was measured using the ^{53}K(p,2p) one-proton removal reaction at ∼210 MeV/u at the RIBF facility. The 2_{1}^{+} excitation energy is found at 1656(18) keV, the highest among the Ar isotopes with N>20. This result is the first experimental signature of the persistence of the N=34 subshell closure beyond ^{54}Ca, i.e., below the magic proton number Z=20. Shell-model calculations with phenomenological and chiral-effective-field-theory interactions both reproduce the measured 2_{1}^{+} systematics of neutron-rich Ar isotopes, and support a N=34 subshell closure in ^{52}Ar.

Published
2019

71. Nuclear structure of Ni76 from the ( p,2p ) reaction

Author

Kamila Sieja, L. Olivier, Shuichi Ota, H. Wang, Ryo Taniuchi, C. Santamaria, P. A. Söderström, Z. Patel, A. Gillibert, K. Yoneda, E. Sahin, V. Lapoux, Zhenci Xu, R. Lozeva, Kazuyuki Ogata, Jinguang Wu, David Steppenbeck, C. M. Shand, P. Doornenbal, Z. Elekes, Megumi Niikura, K. Hadynska-Klek, Á. Kripkó, Tomohiro Uesaka, I. Stefan, M. Lettmann, Shunji Nishimura, Zs. Dombrádi, C. Louchart, K. Yoshida, T. Miyazaki, F. Flavigny, A. Delbart, Toshiyuki Sumikama, Alan Peyaud, D. Calvet, C. Péron, G. Authelet, T. Isobe, J.-Y. Roussé, J. M. Gheller, V. Werner, Hiroyoshi Sakurai, Daisuke Suzuki, H. Baba, T. Motobayashi, F. Château, E. C. Pollacco, F. Giacoppo, Masafumi Matsushita, Alessandra Corsi, A. Obertelli, Yoshiaki Shiga, L. X. Chung, Dóra Sohler, Shoko Koyama, Z. Korkulu, Satoshi Takeuchi, S. Franchoo, A. Gottardo, Jenny Lee, Yuya Kubota, Hideaki Otsu, K. Matsui, F. Browne, Zs. Vajta, and Satoru Momiyama

Subjects
Physics, Proton, Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Shell (structure), Nuclear structure, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Coincidence, Spectral line, Nickel, medicine.anatomical_structure, chemistry, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Nucleus
Abstract

The nuclear structure of the Ni76 nucleus was investigated by (p,2p) reaction using a NaI(Tl) array to detect the deexciting prompt γ rays. A new transition with an energy of 2227 keV was identified by γγ and γγγ coincidences. According to these coincidence spectra the observed transition connects a new state at 4147 keV and the previously known 41+ state at 1920 keV. Two weaker transitions were also obtained at 2441 and 2838 keV, which could be tentatively placed to feed the known 21+ state at 990 keV. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z=28 shell gap for nickel isotopes in accordance with previous studies.

Published
2019

72. $^{78}$Ni revealed as a doubly magic stronghold against nuclear deformation

Author

Frédéric Nowacki, L. Olivier, K. Yoneda, Tsuyoshi Miyazaki, H. Wang, I. Stefan, J. Simonis, Zhengyu Xu, C. Santamaria, Javier Fernandez Menendez, Ertan Şahin, D. Calvet, Kazuyuki Ogata, R. Lozeva, C. Louchart, Takaharu Otsuka, Satoshi Takeuchi, Alexandre Obertelli, Yusuke Tsunoda, J.-Y. Roussé, Tadaaki Isobe, F. Giacoppo, F. Château, A. Gottardo, E. C. Pollacco, Jenny Lee, T. Sumikama, K. Matsui, Zs. Vajta, David Steppenbeck, Sophie Péru, S. Nishimura, Zena Patel, Frank Browne, C. M. Shand, Tohru Motobayashi, Shinsuke Ota, S. Momiyama, Hiroyoshi Sakurai, K. Hadynska-Klek, H. Otsu, Alfredo Poves, A. Gillibert, Daisuke Suzuki, Hidetada Baba, A. Delbart, S. Franchoo, Yuki Kubota, V. Lapoux, V. Werner, Pär-Anders Söderström, M. Matsushita, Shunpei Koyama, M. Lettmann, Jason D. Holt, Z. Korkulu, A. Corsi, Alan Peyaud, Achim Schwenk, Yoshiaki Shiga, R. Taniuchi, Jin Wu, L. X. Chung, S. R. Stroberg, M. Niikura, Tomohiro Uesaka, Zs. Dombrádi, Pieter Doornenbal, C. Péron, G. Authelet, J. M. Gheller, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Proton, Nuclear Theory, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Strong interaction, FOS: Physical sciences, 01 natural sciences, Asymmetry, Nuclear Theory (nucl-th), Magic number (programming), 0103 physical sciences, Effective field theory, Physics::Atomic and Molecular Clusters, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, media_common, Physics, [PHYS]Physics [physics], Multidisciplinary, 010308 nuclear & particles physics, Magic (programming), Atomic nucleus, Atomic physics
Abstract

Nuclear magic numbers, which emerge from the strong nuclear force based on quantum chromodynamics, correspond to fully occupied energy shells of protons, or neutrons inside atomic nuclei. Doubly magic nuclei, with magic numbers for both protons and neutrons, are spherical and extremely rare across the nuclear landscape. While the sequence of magic numbers is well established for stable nuclei, evidence reveals modifications for nuclei with a large proton-to-neutron asymmetry. Here, we provide the first spectroscopic study of the doubly magic nucleus $^{78}$Ni, fourteen neutrons beyond the last stable nickel isotope. We provide direct evidence for its doubly magic nature, which is also predicted by ab initio calculations based on chiral effective field theory interactions and the quasi-particle random-phase approximation. However, our results also provide the first indication of the breakdown of the neutron magic number 50 and proton magic number 28 beyond this stronghold, caused by a competing deformed structure. State-of-the-art phenomenological shell-model calculations reproduce this shape coexistence, predicting further a rapid transition from spherical to deformed ground states with $^{78}$Ni as turning point.

Published
2019

73. Study of the deuteron analyzing powers in dp elastic scattering at the energy of 800 MeV

Author

A. A. Terekhin, V. P. Ladygin, S. G. Reznikov, S. M. Piyadin, Olena Mezhenska, A. V. Averyanov, Marian Janek, Yu. V. Gurchin, P. K. Kurilkin, J. T. Karachuk, D. Enache, Tomohiro Uesaka, A. V. Tishevsky, J. Urban, E. V. Chernykh, A. N. Khrenov, Ya.T. Skhomenko, N. B. Ladygina, A. N. Livanov, A. Yu. Isupov, and D. O. Krivenkov

Subjects
Physics, Nuclear physics, Elastic scattering, Nuclotron, Deuterium, Scattering, QC1-999, Tensor, Nuclear Experiment, Energy (signal processing), Beam (structure), Ion
Abstract

Preliminary results on the angular distributions of the vector Ay and tensor Ayy, Axx analyzing powers in dp elastic scattering at the energy of 800 MeV are presented. The measurements have been performed on Internal Target Station of the JINR Nuclotron using polarized deuteron beam from new source of polarized ions. The experimental data are compared with the preliminary calculations obtained within framework of relativistic multiple scattering approach.

Published
2019

74. Energy dependence of the vector Ay and tensor Ayy and Axx analyzing powers in deuteron-proton elastic scattering at large scattering angles

Author

Olena Mezhenska, Marian Janek, S. G. Reznikov, J. T. Karachuk, A. V. Averyanov, A. A. Terekhin, A. V. Tishevsky, A. N. Khrenov, Ya.T. Skhomenko, A. N. Livanov, D. Enache, E. V. Chernykh, A. Yu. Isupov, V. P. Ladygin, D. O. Krivenkov, Tomohiro Uesaka, N. B. Ladygina, S. M. Piyadin, Yu. V. Gurchin, and P. K. Kurilkin

Subjects
Physics, Elastic scattering, Nuclotron, Range (particle radiation), Proton, 010308 nuclear & particles physics, Scattering, Computer Science::Information Retrieval, Isoscalar, QC1-999, Nuclear Theory, Spin structure, 01 natural sciences, Nuclear physics, 0103 physical sciences, Physics::Accelerator Physics, Tensor, 010306 general physics, Nuclear Experiment
Abstract

The results on the angular dependencies of the vectorAyand tensorAyyandAxxanalyzing powers in deuteron-proton elastic scattering at large scattering angles are presented. These data were obtained at internal target at the JINR Nuclotron in the energy range 400-1800 MeV using polarized deuteron beam from new polarized ion source. New data on the deuteron analyzing powers in the wide energy range demonstrate strong sensitivity to the short-range spin structure of the isoscalar nucleon-nucleon correlations observed earlier. The perspectives of further studies of the short-range correlations using carbon, polarized deuteron and proton beams are discussed.

Published
2019

75. Experimental Approach to Three-nucleon Forces via Three- and Four-nucleon Scattering

Author

T. Mukai, S. Kawakami, M. Tabata, Y. Shindo, S. Shibuya, Makoto Watanabe, Masanori Dozono, Y. Yanagisawa, Satoshi Sakaguchi, A. Watanabe, Hideyuki Sakai, Y. Wada, Kentaro Yako, Y. Shiokawa, Kenjiro Miki, Tomotsugu Wakasa, S. Chebotaryov, J. Yasuda, Tomohiro Uesaka, N. Sakamoto, T. Akieda, Yukie Maeda, D. Sakai, D. Eto, S. Nakai, E. Milman, Takashi Wakui, Kimiko Sekiguchi, A. Ohkura, Masaki Sasano, H. Kon, Hiroshi Suzuki, K. Kawahara, T. Taguchi, Yuya Kubota, Masatoshi Itoh, and Tatsuya Yamamoto

Subjects
Physics, Nuclear physics, 010308 nuclear & particles physics, Scattering, 0103 physical sciences, 010306 general physics, Nucleon, 01 natural sciences
Published
2018

76. $\alpha$-clustering at the Surface of Tin Isotopes $^{112−124}$Sn Studied with $(p, p\alpha)$ Reaction

Author

Marco Knösel, Juzo Zenihiro, Kazuyuki Ogata, Nobuyuki Kobayashi, Yohei Matsuda, Yuki Kubota, Wei Liu, Yuki Fujikawa, Thomas Aumann, Shi-Wei Bai, V. Panin, Stefan Typel, Fabia Schindler, Kazuki Yoshida, Ying Jiang, Yukie Maeda, Jianlin Lou, Kenjiro Miki, Sebastian Heil, S. N. Nakamura, S. Adachi, Jiaxing Han, A. Inoue, P. Schrock, Patrick van Beek, Dmytro Symochko, Atsushi Tamii, Junki Tanaka, Heiko Scheit, Zaihong Yang, Siwei Huang, V. Wagner, Tomohiro Uesaka, Didier Beaumel, Institut de Physique Nucléaire d'Orsay (IPNO), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Surface (mathematics), Materials science, 010308 nuclear & particles physics, 13. Climate action, 0103 physical sciences, Isotopes of tin, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Cluster analysis, Nuclear Experiment, 01 natural sciences, Calculation methods
Abstract

International audience; α-clustering strength at the surface of tin isotopes ^112,116,120,124Sn was measured by using quasi-free (p, pα) reaction at RCNP. By measuring the scattered protons and α particles in coincidence, formation of α clusters at the surface of tin isotopes was clearly evidenced. Surface α-clustering in heavy nuclei provides a natural explanation for the origin of α particles in α decay, and may also impact the neutron-skin thickness which plays an important role in constraining the nuclear symmetry energy.

Published
2018

77. Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring

Author

T. Fujii, T. Mitsui, S. Naimi, Yu. A. Litvinov, Giuseppe Lorusso, Tetsuaki Moriguchi, Yoshiyuki Yanagisawa, Shinji Suzuki, Daiki Kamioka, A. Ozawa, Takayuki Yamaguchi, R. Igosawa, Masanori Wakasugi, Shuichi Ota, Yasushi Abe, Kiyoshi Wakayama, Tomohiro Uesaka, Daisuke Nagae, Yoshitaka Yamaguchi, Kunimitsu Nishimuro, Natsuki Tadano, Z. Ge, Hiroki Arakawa, Shunsuke Okada, Shin'ichiro Michimasa, F. Suzaki, S. Hosoi, Kumi Inomata, S. Omika, M. Amano, and H. Baba

Subjects
Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Time of flight detector, 010308 nuclear & particles physics, business.industry, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Electron, 01 natural sciences, 7. Clean energy, Secondary electrons, Optics, 0103 physical sciences, Microchannel plate detector, Nuclear Experiment (nucl-ex), 010306 general physics, business, Nuclear Experiment, Instrumentation, Beam (structure), Storage ring, FOIL method
Abstract

An electrostatic time-of-flight detector named E-MCP has been developed for quick diagnostics of circulating beam and timing measurement in mass spectrometry at the Rare-RI Ring in RIKEN. The E-MCP detector consists of a conversion foil, potential grids, and a microchannel plate. Secondary electrons are released from the surface of the foil when a heavy ion hits it. The electrons are accelerated and deflected by 90$^\circ$ toward the microchannel plate by electrostatic potentials. A thin carbon foil and a thin aluminum-coated mylar foil were used as conversion foils. We obtained time resolutions of 69(1) ps and 43(1) ps (standard deviation) for a $^{84}$Kr beam at an energy of 170 MeV/u when using the carbon and the aluminum-coated mylar foils, respectively. A detection efficiency of approximately 90% was obtained for both foils. The E-MCP detector equipped with the carbon foil was installed inside the Rare-RI Ring to confirm particle circulation within a demonstration experiment on mass measurements of nuclei around $^{78}$Ge produced by in-flight fission of uranium beam at the RI Beam Factory in RIKEN. Periodic time signals from circulating ions were clearly observed. Revolution times for $^{78}$Ge, $^{77}$Ga, and $^{76}$Zn were obtained. The results confirmed successful circulation of the short-lived nuclei inside the Rare-RI Ring.

Published
2021

78. Study of spin-isospin response of 11Li neutron-drip-line nucleus with PANDORA

Author

Masaki Sasano, M. Miwa, T. Kobayashi, I. C. Stefanescu, D. Tudor, Tomohiro Uesaka, T. Isobe, K. Yoneda, D. Inomoto, Zaihong Yang, M. Nishimura, L. Stuhl, H. Baba, I. S. Hahn, D. Kim, K. Yoshida, A. I. Chilug, Y. Fujino, H. Suzuki, H. Sato, Yosuke Kondo, Zoltán Halász, H. Kasahara, Kentaro Yako, Tomotsugu Wakasa, Yasuhiro Togano, G. G. Kiss, T. Motobayashi, T. Shimada, Shin'ichiro Michimasa, X. Sun, Naoki Fukuda, Juzo Zenihiro, H. N. Liu, Takashi Nakamura, S. Park, Masashige Matsumoto, H. Miki, Y. Hirai, V. Panin, Hiroki Yamada, A. Spiridon, T. Tomai, Susumu Shimoura, Y. L. Sun, D. S. Ahn, M. N. Harakeh, H. Sakai, Makoto Yasuda, A. Kurihara, Atsumi Saito, N. Zhang, L. Trache, Yuya Kubota, J. Gibelin, Yohei Shimizu, S. Franchoo, Hideaki Otsu, J. Gao, Shoko Koyama, Z. Korkulu, T. Harada, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, 010308 nuclear & particles physics, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, Nuclear physics, medicine.anatomical_structure, Isospin, 0103 physical sciences, medicine, Nuclear drip line, Nuclear Experiment, 010306 general physics, Nucleus, Spin-½
Abstract

The spin-isospin responses of the 11Li drip-line nucleus has been measured. Preliminary results of the 11Li(p, n)11Be experiment in inverse kinematics at RI Beam Factory (RIBF) of RIKEN Nishina Center are presented including the observation of 1n, 2n, t, d, 2α and 6He+α decay channels of 11Be reaction product. Details of the experimental setup based on PANDORA (Particle Analyzer Neutron Detector Of Real-time Acquisition) low-energy neutron detector and the SAMURAI large-acceptance magnetic spectrometer are described.

Published
2020

79. Inverse kinematics (p,n) reactions studies using the WINDS slow neutron detector and the SAMURAI spectrometer

Author

H. Sato, Masaki Sasano, J. Yasuda, K. Kisamori, N. Fukuda, Shuichi Ota, Toshio Kobayashi, Shunpei Koyama, M. Kurata-Nishimura, Noritsugu Nakatsuka, T. Motobayashi, Juzo Zenihiro, M. Kaneko, D. Kameda, Remco Zegers, D. Mücher, Takashi Nakamura, Yosuke Kondo, Masanori Dozono, Naohiro Inabe, W. Chao, Yuya Kubota, J. W. Lee, T. Murakami, A. Krasznahorkay, G. Jhang, Susumu Shimoura, J. Tsubota, H. Suzuki, Tomohiro Uesaka, Motoki Kobayashi, M. Sako, C. S. Lee, Motonobu Takaki, M. Shikata, Hiroshi Tokieda, E. Milman, H. Sakai, Daniel Bazin, Yohei Shimizu, H. Otsu, Hidetada Baba, Tomotsugu Wakasa, Tadaaki Isobe, Yasuhiro Togano, T. Tako, S. Reichert, Kentaro Yako, W. Powell, Shin'ichiro Michimasa, Shoichiro Kawase, S. Tangwancharoen, L. Stuhl, V. Panin, Toshiyuki Sumikama, Hiroyuki Takeda, Yohei Matsuda, K. Yoneda, Toshiyuki Kubo, Satoshi Sakaguchi, and N. Kobayashi

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, 01 natural sciences, Neutron temperature, Nuclear physics, Time of flight, Recoil, 0103 physical sciences, Neutron detection, Neutron, Atomic number, Nuclear Experiment, 010306 general physics, Instrumentation, Excitation
Abstract

We have combined the low-energy neutron detector WINDS (Wide-angle Inverse-kinematics Neutron Detectors for SHARAQ) and the SAMURAI spectrometer at RIKEN Nishina Center RI Beam Factory (RIBF) in order to perform ( p , n ) reactions in inverse kinematics for unstable nuclei in the mass region around A ∼ 100 . In this setup, WINDS is used for detecting recoil neutrons and the SAMURAI spectrometer is used for tagging decay channel of heavy residue. The first experiment by using the setup was performed to study Gamow–Teller transitions from 132 Sn in April 2014. The atomic number Z and mass-to-charge ratio A / Q of the beam residues were determined from the measurements of time of flight, magnetic rigidity and energy loss. The obtained A / Q and Z resolutions were σ A / Q = 0.14 % and σ Z = 0.22 , respectively. Furthermore, owing to the large momentum acceptance ( 50 % ) of SAMURAI, the beam residues associated with the γ , 1n and 2n decay channel were measured in the same magnetic field setting. The kinematic loci of the measured recoil neutron energy and laboratory angle are clearly seen. It shows that the excitation energy up to about 20 MeV can be reconstructed.

Published
2016

80. Spectroscopy of neutron-rich scandium isotopes

Author

A. Delbart, T. Motobayashi, L. Zanetti, Julien Gibelin, Tomohiro Uesaka, T. Kobayashi, X. X. Xu, H. Toernqvist, Si-Ge Chen, P. A. Söderström, S. Wang, F. Flavigny, A. Obertelli, V. Wagner, M. Lettmann, D. Calvet, J. M. Gheller, T. Isobe, A. Giganon, F. Château, Thomas Aumann, Makoto Yasuda, Victor Vaquero, A. Gillibert, V. Panin, L. X. Chung, E. Sahin, S. Y. Park, T. Lokotko, Duo Yan, P. Doornenbal, K. Moschner, M. MacCormick, C. Hilaire, Kathrin Wimmer, Alessandra Corsi, Satoshi Takeuchi, Takashi Nakamura, R.-B. Gerst, B. D. Linh, M. L. Cortés, S. Franchoo, Igor Gašparić, H. N. Liu, K. Yoneda, C. Lehr, Jenny Lee, F. Browne, Yuya Kubota, Masaki Sasano, N. Paul, D. M. Rossi, V. Werner, Yasuhiro Togano, Yosuke Kondo, H. Baba, N. L. Achouri, Hideaki Otsu, Hirofumi Yamada, Y. L. Sun, Dong-Wook Kim, O. Aktas, V. Lapoux, Zaihong Yang, I. Murray, K. I. Hahn, David Steppenbeck, L. Stuhl, W. Rodriguez, Nobuyuki Chiga, T. Koiwai, Norbert Pietralla, D. Sohler, P. Koseoglou, Hiroyoshi Sakurai, RIKEN Nishina Center for Accelerator-Based Science, Technische Universität Darmstadt, Helmholtz Centre for Heavy Ion Research, Federal Ministry of Education and Research (Germany), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Computer Science Applications, Education, International school, Neutron physics, Nuclear physics, chemistry, 0103 physical sciences, Physics::Accelerator Physics, ddc:530, Neutron, Scandium, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

7 pags., 7 figs. -- XXIII International School on Nuclear Physics, Neutron Physics and Applications 22-28 September 2019, Varna, Bulgaria, Within the SEASTAR III campaign at the Radioactive Isotope Beam Factory, at the RIKEN Nishina Center, neutron-rich isotopes in the vicinity of 53K were produced from the fragmentation of the primary 70Zn beam on a 9Be target. After nucleon knockout reactions on the secondary liquid hydrogen MINOS target the known γ rays of the neutron-rich 55Sc isotope were observed (shown in this proceedings) and γ rays from 57,59Sc isotopes have been identified for the first time. The evolution of the occupied nucleon orbitals of these nuclei in the ground and excited state is investigated under the prism of the tensor force., We are grateful to the RIKEN Nishina Center accelerator staff for their work in the primary beam delivery and the BigRIPS team for preparing the secondary beams. This work was supported by the cooperation between TU Darmstadt and the GSI Helmholtz Center for Heavy Ion Research, by the Helmholtz Graduate School for Hadron and Ion Research for FAIR and its abroad program and the BMBF under grant No. 05P19RDFN1. D.S. was supported by projects No. GINOP2.3.3-15-2016-00034 and No. K128947.

Published
2020

81. Restoration of the natural E(1/21+) - E(3/21+) energy splitting in odd-K isotopes towards N = 40

Author

David Steppenbeck, B. D. Linh, H. Törnqvist, Igor Gašparić, H. N. Liu, Kazuki Yoshida, Yosuke Kondo, Toshio Kobayashi, P. A. Söderström, K. Yoneda, N. Paul, Carlo Barbieri, S. Y. Park, D. M. Rossi, V. Lapoux, Donghang Yan, H. Baba, K. Moschner, Masaki Sasano, V. Werner, Yutaka Utsuno, Yoshiki Chazono, S. Wang, D. Sohler, Zaihong Yang, I. Murray, K. I. Hahn, L. Stuhl, Kathrin Wimmer, Jenny Lee, J. M. Gheller, Victor Vaquero, R.-B. Gerst, Takaharu Otsuka, F. Browne, A. Obertelli, Nobuyuki Chiga, D. Calvet, T. Isobe, Hiroyoshi Sakurai, T. Koiwai, Yuya Kubota, C. Hilaire, T. Motobayashi, F. Nowacki, F. Château, A. Delbart, C. Lehr, A. Gillibert, M. MacCormick, Julien Gibelin, A. Corsi, X. X. Xu, V. Panin, M. L. Cortés, Thomas Aumann, O. Aktas, S. Franchoo, Si-Ge Chen, L. X. Chung, L. Zanetti, A. Giganon, Francesco Raimondi, Hideaki Otsu, Hirofumi Yamada, Tomohiro Uesaka, W. Rodriguez, F. Flavigny, Yasuhiro Togano, T. Lokotko, E. Sahin, N.L. Achouri, Y.L. Sun, Takashi Nakamura, Petr Navrátil, P. Doornenbal, Thomas Duguet, V. Wagner, Satoshi Takeuchi, D. Kim, V. Somà, Masahiro Yasuda, Kazuyuki Ogata, and P. Koseoglou

Subjects
Physics, Nuclear and High Energy Physics, Chemical substance, Isotope, 010308 nuclear & particles physics, SHELL model, 01 natural sciences, Vertex (geometry), Ab initio quantum chemistry methods, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Spectroscopy
Abstract

We report on the first γ-ray spectroscopy of 51,53K produced via the 52,54Ca(p,2p) reactions at ∼250 MeV/nucleon. Unambiguous final-state angular-momentum assignments were achieved for beam intensities down to few particles per second by using a new technique based on reaction vertex tracking combined with a thick liquid-hydrogen target. Through γ-ray spectroscopy and exclusive parallel momentum distribution analysis, 3/2+ ground states and 1/2+ first excited states in 51,53K were established quantifying the natural ordering of the 1 d 3 / 2 and 2 s 1 / 2 proton-hole states that are restored at N = 32 and 34. State-of-the-art ab initio calculations and shell-model calculations with improved phenomenological effective interactions reproduce the present data and predict consistently the increase of the E(1/2 1 + ) - E(3/2 1 + ) energy differences towards N = 40.

Published
2020

82. Deuteron analyzing powers in dp- elastic scattering at large transverse momenta

Author

V. P. Ladygin, Ya.T. Skhomenko, A. A. Terekhin, Tomohiro Uesaka, S. G. Reznikov, Marian Janek, E. V. Chernykh, D. Enache, A. V. Averyanov, S. M. Piyadin, N. B. Ladygina, A. N. Livanov, A. V. Tishevsky, Yu. V. Gurchin, P. K. Kurilkin, A. Yu. Isupov, D. O. Krivenkov, J. T. Karachuk, I. S. Volkov, and A. N. Khrenov

Subjects
Nuclear physics, Physics, Elastic scattering, History, Transverse plane, Deuterium, Computer Science Applications, Education
Abstract

The results on the vector Ay and tensor Ayy and Axx analyzing powers in deuteronproton elastic scattering at large transverse momenta are presented. These data were obtained at internal target at JINR Nuclotron in the energy range 400-1800 MeV using polarized deuteron beam from new polarized ion source. New data on the deuteron analyzing powers in in the wide energy range demonstrate the sensitivity to the short-range spin structure of the isoscalar nucleon-nucleon correlations.

Published
2020

83. Study of the polarization observables in dp → dp reaction at the deuteron energy of 800 MeV

Author

Olena Mezhenska, A. N. Livanov, V. P. Ladygin, A. A. Terekhin, E. V. Chernykh, J. T. Karachuk, D. Enache, A. V. Tishevsky, Yu. V. Gurchin, A. N. Khrenov, Ya.T. Skhomenko, P. K. Kurilkin, S. M. Piyadin, A. Yu. Isupov, D. O. Krivenkov, Marian Janek, J. Urban, Tomohiro Uesaka, S. G. Reznikov, N. D. Ladygina, and A. V. Averyanov

Subjects
Physics, Elastic scattering, Nuclear physics, History, Nuclotron, Deuterium, Observable, Tensor, Spin structure, Breakup, Nucleon, Computer Science Applications, Education
Abstract

The polarization observables are sensitive to the two nucleón (2NF) and three-nucleon structures (3NF) of the nuclei. The aim of the deuteron spin structure (DSS) experiment is to obtain polarization observables in dp elastic scattering at large CMS angles (> 60°) and in dp breakup. Of great importance is the study of polarizations observables in these reactions at intermediate energies because the experimental and theoretical data are very scarce. In this review, results of vector and tensor analyzing powers obtained at JINR Nuclotron at 800 MeV will be presented.

Published
2020

84. Extraction of the Landau-Migdal Parameter from the Gamow-Teller Giant Resonance in Sn132

Author

Hiroshi Tokieda, Hiroyuki Takeda, Masaki Sasano, D. Muecher, M. Shikata, K. Kisamori, D. Kameda, Tomohiro Uesaka, G. Jhang, W. Chao, M. Kurata-Nishimura, M. Kaneko, Jongmin Lee, S. Reichert, H. Sakai, K. Yoneda, Toshiyuki Kubo, W. Powell, R. G. T. Zegers, H. Baba, Yohei Matsuda, Tadaaki Isobe, Nagao Kobayashi, D. Bazin, J. Yasuda, Yosuke Kondo, Toshio Kobayashi, Kentaro Yako, Tomotsugu Wakasa, Noritsugu Nakatsuka, Yasuhiro Togano, T. Motobayashi, Shin'ichiro Michimasa, Juzo Zenihiro, H. Sato, S. Tangwancharoen, Takashi Nakamura, J. Tsubota, A. Krasznahorkay, Susumu Shimoura, C. S. Lee, E. Milman, Motonobu Takaki, L. Stuhl, V. Panin, Toshiyuki Sumikama, N. Fukuda, Shuichi Ota, Yuya Kubota, Yohei Shimizu, T. Murakami, Satoshi Sakaguchi, Hideaki Otsu, T. Tako, M. Sako, Motoki Kobayashi, Shoko Koyama, Naohito Inabe, Masanori Dozono, and H. Suzuki

Subjects
Physics, Pion, 010308 nuclear & particles physics, Giant resonance, 0103 physical sciences, General Physics and Astronomy, Sum rule in quantum mechanics, Atomic physics, 010306 general physics, Nuclear matter, 01 natural sciences, Excitation
Abstract

The key parameter to discuss the possibility of the pion condensation in nuclear matter, i.e., the so-called Landau-Migdal parameter g^{'}, was extracted by measuring the double-differential cross sections for the (p,n) reaction at 216 MeV/u on a neutron-rich doubly magic unstable nucleus, ^{132}Sn with the quality comparable to data taken with stable nuclei. The extracted strengths for Gamow-Teller (GT) transitions from ^{132}Sn leading to ^{132}Sb exhibit the GT giant resonance (GTR) at the excitation energy of 16.3±0.4(stat)±0.4(syst) MeV with the width of Γ=4.7±0.8 MeV. The integrated GT strength up to E_{x}=25 MeV is S_{GT}^{-}=53±5(stat)_{-10}^{+11}(syst), corresponding to 56% of Ikeda's sum rule of 3(N-Z)=96. The present result accurately constrains the Landau-Migdal parameter as g^{'}=0.68±0.07, thanks to the high sensitivity of the GTR energy to g^{'}. In combination with previous studies on the GTR for ^{90}Zr and ^{208}Pb, the result of this work shows the constancy of this parameter in the nuclear chart region with (N-Z)/A=0.11 to 0.24 and A=90 to 208.

Published
2018

85. Spectroscopic Study in Neutron-Rich Mn Isotopes Around the $N=40$ 'Island of Inversion'

Author

X. D. Tang, C. Péron, G. Authelet, Y. H. Lam, Shunji Nishimura, J. M. Gheller, V. Lapoux, Megumi Niikura, Tomohiro Uesaka, Masaki Sasano, D. Calvet, De-fu Hou, A. Gillibert, K. Matsui, G. L. Stefan, C. M. Shand, F. Browne, H. Baba, Toshiyuki Sumikama, P. M. Walker, M. Lettmann, Feng-Shou Zhang, F. Giacoppo, K. Yoneda, C. Santamaria, Zs. Vajta, David Steppenbeck, L. Olivier, E. C. Pollacco, C. Louchart, Jinguang Wu, Hideaki Otsu, S. M. Lenzi, Yoshiaki Shiga, Bing Ding, M. D. Sun, T. Miyazaki, Satoru Momiyama, A. Obertelli, Shuichi Ota, T. H. Huang, F. Nowacki, Hiroyoshi Sakurai, B. D. Linh, T. Motobayashi, Jenny Lee, P. A. Söderström, H. Lu, R. Lozeva, X.Y. Liu, Zena Patel, K. Hadynska-Klek, E. Sahin, Zhenci Xu, Z. Korkulu, Zs. Dombradi, Yuya Kubota, X. H. Zhou, T. Isobe, P. Doornenbal, Zi Hong Liu, V. Werner, F. Château, Satoshi Takeuchi, W.Q. Zhang, S. Franchoo, H. Wang, Y. H. Zhang, J.-Y. Roussé, L. X. Chung, H. S. Xu, Daisuke Suzuki, Alan Peyaud, A. Corsi, A. Delbart, Ryo Taniuchi, Shoko Koyama, A. Gottardo, Masafumi Matsushita, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, 21.10.-k, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Island of inversion, structure evolution, Mineralogy, 23.20.Lv, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], island of inversion, Quansi-rotational band, 7. Clean energy, In-beam γ-ray spectroscopy, 21.60.Cs, Neutron, 21.10.Re
Abstract

International audience; Excited states in Mn isotopes with mass number A from 63 to 67 were studied via in-beam γ–ray spectroscopy following knockout reactions from 67,68Fe. In odd-A isotopes 63,65,67Mn, similar level schemes, consisting of the 11/2-, 9/2-, 7/2-, and 5/2-g.s. level sequence, connected by I →I -1 transitions, were established, the first time for 65,67Mn. Experimental results of odd-A Mn isotopes are compared with large-scale shell-model calculations in the model space that includes the vg9/2 and vd5/2 orbitals with the state-of-the-art LNPS effective interaction. The constructed level schemes in odd-odd isotopes 64,66Mn show rotational-like properties. Spin and parity of the excited states, as well as the πf7/2 ⊗ vg9/2 configuration of the bands are tentatively assigned based on the level systematics in the odd-odd isotopes. These new data extends the knowledge of the excited states in Mn isotopes. Discussion in terms of the systematics helps to deepen our understanding of the N = 40 “island of inversion”.

Published
2018

86. Erratum: Persistence of the Z=28 Shell Gap Around Ni78 : First Spectroscopy of Cu79 [Phys. Rev. Lett. 119 , 192501 (2017)]

Author

Megumi Niikura, Tomohiro Uesaka, K. Yoneda, I. Stefan, Alessandra Corsi, Dóra Sohler, Satoru Momiyama, A. Gillibert, C. Santamaria, Hideaki Otsu, A. Delbart, Kazuyuki Ogata, David Steppenbeck, Ryo Taniuchi, Shoko Koyama, C. M. Shand, Z. Korkulu, A. Gottardo, Jenny Lee, Alan Peyaud, Zsolt Dombrádi, K. Matsui, Yuya Kubota, F. Flavigny, C. Péron, Shunji Nishimura, F. Browne, J.-Y. Roussé, G. Authelet, V. Werner, Yoshiaki Shiga, C. Louchart, Takaharu Otsuka, J. M. Gheller, Toshiyuki Sumikama, Masaki Sasano, E. Sahin, Zhenci Xu, Masafumi Matsushita, Jinguang Wu, P. Doornenbal, Satoshi Takeuchi, S. Franchoo, Shuichi Ota, H. Baba, Yusuke Tsunoda, T. Miyazaki, K. Hadynska-Klek, L. X. Chung, Z Vajta, Daisuke Suzuki, L. Olivier, H. Wang, R. Lozeva, Z. Patel, D. Calvet, T. Isobe, F. Château, F. Giacoppo, V. Lapoux, M. Lettmann, P. A. Söderström, A. Obertelli, Hiroyoshi Sakurai, T. Motobayashi, and E. C. Pollacco

Subjects
Physics, Persistence (psychology), 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), General Physics and Astronomy, 010306 general physics, Spectroscopy, 01 natural sciences, Molecular physics
Published
2018

87. Isochronous mass measurements of Tz=−1fp -shell nuclei from projectile fragmentation of Ni58

Author

X. K. Zhou, C. Y. Fu, Yoshitaka Yamaguchi, Ruishi Mao, Shigeru Kubono, M. Z. Sun, Sergey Litvinov, Yu. A. Litvinov, R.J. Chen, Xiao-Lin Tu, Xurong Xu, H. S. Xu, X. C. Chen, Takayuki Yamaguchi, Yu Sun, Tomohiro Uesaka, W. L. Zhan, Pengli Zhang, A. Ozawa, X. L. Yan, G. Audi, Bao-Hua Sun, Jiuyang He, Klaus Blaum, Di Liu, Qingqi Zeng, Y. H. Zhang, Furong Xu, Ping Shuai, X. H. Zhou, M. Wang, Xiu-Wen Ma, Tianwei Bao, Huaican Chen, Y. M. Xing, and Y. H. Lam

Subjects
Physics, 010308 nuclear & particles physics, Isochronous mass spectrometry, 0103 physical sciences, Nuclear structure, Shell (structure), Atomic physics, 010306 general physics, 01 natural sciences, Projectile fragmentation, Order of magnitude, Atomic mass
Abstract

Atomic masses of seven $T_z=-1$, $fp$-shell nuclei from $^{44}$V to $^{56}$Cu and two low-lying isomers, $^{44m}$V ($J^\pi=6^+$) and $^{52m}$Co ($J^\pi=2^+$), have been measured with relative precisions of $1-4\times 10^{-7}$ with Isochronous Mass Spectrometry (IMS) at CSRe. The masses of $^{56}$Cu, $^{52g,52m}$Co, and $^{44m}$V were measured for the first time in this experiment. The Mass Excesses ($ME^{\prime}$s) of $^{44}$V, $^{48}$Mn, $^{50}$Fe, and $^{54}$Ni are determined with an order of magnitude improved precision compared to the literature values. $^{52g,52m}$Co and $^{56}$Cu are found to be $370$~keV and $400$~keV more bound, respectively, while $^{44g,44m}$V are $\sim 300$~keV less bound than the extrapolations in the Atomic-Mass Evaluation 2012 (AME$^{\prime}$12). The masses of the four $T_z=-1/2$ nuclei $^{45}$V, $^{47}$Cr, $^{49}$Mn, and $^{51}$Fe are re-determined to be in agreement, within the experimental errors, with the recent JYFLTRAP measurements or with the previous IMS measurements in CSRe. Details of the measurements and data analysis are described, and the impact of the new $ME$ values on different aspects in nuclear structure are investigated and discussed.

Published
2018

88. Masses of the Tz=−3/2 nuclei P27 and S29

Author

Yu Sun, X. K. Zhou, R.J. Chen, Xurong Xu, Di Liu, X. C. Chen, Ping Shuai, M. Z. Sun, Yu. A. Litvinov, Tomohiro Uesaka, Klaus Blaum, C. Y. Fu, Xiao-Lin Tu, G. Audi, W. L. Zhan, A. Ozawa, Ruishi Mao, Y. H. Zhang, Sergey Litvinov, Y. M. Xing, M. Wang, X. H. Zhou, Y. H. Lam, Y. Yamaguchi, Jiuyang He, Shigeru Kubono, Tianwei Bao, Pengli Zhang, Bao-Hua Sun, Qingqi Zeng, X. L. Yan, Huaican Chen, Furong Xu, H. S. Xu, Takayuki Yamaguchi, and Xiu-Wen Ma

Subjects
Physics, Mass excess, Isovector, 010308 nuclear & particles physics, Radius, Quadratic form (statistics), 01 natural sciences, Nuclear physics, Mass formula, Isospin, 0103 physical sciences, Coulomb, 010306 general physics, Multiplet
Abstract

Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the $T_z=-3/2$ nuclei $^{27}$P and $^{29}$S. The new mass excess value $ME$($^{29}$S) $=-3094(13)$~keV is 66(52)~keV larger than the result of the previous $^{32}$S($^3$He,$^{6}$He)$^{29}$S reaction measurement in 1973 and a factor of 3.8 more precise. The new result for $^{29}$S, together with those of the $T=3/2$ isobaric analog states (IAS) in $^{29}$P, $^{29}$Si, and $^{29}$Al, fit well into the quadratic form of the Isobaric Multiplet Mass Equation IMME. The mass excess of $^{27}$P has been remeasured to be $ME(^{27}$P$)=-685(42)$ keV. By analyzing the linear and quadratic coefficients of the IMME in the $T_z=-3/2$ $sd$-shell nuclei, it was found that the ratio of the Coulomb radius parameters is $R\approx0.96$ and is nearly the same for all $T=3/2$ isospin multiplets. Such a nearly constant $R$-value, apparently valid for the entire light mass region with $A>9$, can be used to set stringent constraints on the isovector and isotensor components of the isospin non-conserving forces in theoretical calculations.

Published
2018

89. Magic Nature of Neutrons in Ca54 : First Mass Measurements of Ca55–57

Author

Y. Shimizu, Susumu Shimoura, Masafumi Matsushita, Eiji Ideguchi, Yuya Kubota, K. Kobayashi, Andreas Stolz, H. Baba, Hiroshi Tokieda, Naoki Fukuda, R. Yokoyama, Y. L. Yamaguchi, Hideyuki Sakai, Takeo Kawabata, Kentaro Yako, Toshiyuki Kubo, Daiki Nishimura, Tomohiro Uesaka, Tatsuya Furuno, Y. Yanagisawa, Shuichi Ota, H. Nagakura, DeukSoon Ahn, Kenichi Yoshida, Motoki Kobayashi, C. S. Lee, K. Kisamori, Hiroyuki Miya, A. Mizukami, Motonobu Takaki, H. Oikawa, Masanori Dozono, H. Takeda, Shin'ichiro Michimasa, Naohito Inabe, Hiroshi Suzuki, Satoshi Takeuchi, Shoichiro Kawase, Y. Kiyokawa, and G. P. A. Berg

Subjects
Physics, 010308 nuclear & particles physics, Band gap, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Atomic mass, Isotopes of calcium, Atomic orbital, Neutron number, 0103 physical sciences, Neutron, MAGIC (telescope), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990) keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.

Published
2018

90. Study of multi-neutron systems with SAMURAI spectrometer

Author

K. Yoneda, Z. Elekes, Masaki Sasano, Heiko Scheit, Atsumi Saito, N. Inabe, I. Stefan, J. Tscheuschner, Mohsen Harakeh, Julien Gibelin, M. A. Knösel, K. Boretzky, Z. Ge, Takashi Nakamura, D. Kim, H. Sato, J. Kahlbow, Igor Gašparić, Y. Yasuda, Susumu Shimoura, T. Isobe, Juzo Zenihiro, M. Caamaño, Yosuke Kondo, S. Masuoka, H. Suzuki, A. Hirayama, S. W. Huang, C. A. Douma, B. M. Godoy, Z. Halász, H. Yamada, C. Lehr, M. Böhmer, Nobuyuki Chiga, A. Revel, N. L. Achouri, P. Koseoglou, Kathrin Wimmer, V. Wagner, N. A. Orr, M. Potlog, M. Miwa, B. Yang, A. Obertelli, T. Harada, H. T. Törnqvsit, S. Reichert, H. Miki, D. S. Ahn, T. Tomai, István Kuti, J. Mayer, J. Tanaka, S. Park, Yasuhiro Togano, M. Parlog, Naoki Fukuda, Yu-xin Liu, S. Chen, V. Panin, L. Zanetti, F. Schindler, S. Storck, T. Shimada, Tomohiro Uesaka, J. Feng, M. Matsumoto, Zaihong Yang, U. Forsberg, Roman Gernhäuser, I. Murray, F. Dufter, D. Symochko, L. Stuhl, J. M. Gheller, Hideaki Otsu, D. Beaumel, T. Kobayashi, H. Takeda, A. Gillibert, D. Cortina, P. Doornenbal, L. Yang, Nasser Kalantar-Nayestanaki, Satoshi Takeuchi, Thomas Aumann, Stefanos Paschalis, T. Fujino, D. M. Rossi, H. Baba, Yohei Shimizu, M. L. Cortés, F. M. Marqués, B. Fernández-Domínguez, Yuya Kubota, Yukie Maeda, S. K. Kim, P. J. Li, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Firm conclusion, Spectrometer, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

The tetraneutron has been drawing the attention of the nuclear physics community for decades, but a firm conclusion on its existence and properties is still far from being reached despite many experimental and theoretical efforts. New measurements have recently been performed at RIBF with the SAMURAI spectrometer by applying complementary reaction probes, which will help to pin down the properties of this four-neutron system., Comment: 5 pages, 2 figures, conference proceedings of XXII International Conference on Few-Body Problems in Physics (FB22), Caen, France, July 2018

Published
2018

91. Study of the $^9$C breakup through NP1412-SAMURAI29R1 experiment

Author

H. Takeda, T. Motobayashi, Livius Trache, Julien Gibelin, S. Park, T. Isobe, G. Kiss, D. Tudor, K. Yoneda, A. I. Chilug, Hideaki Otsu, Shinsuke Ota, H. Baba, F. M. Marques, A. Kurihara, M.N. Harakeh, H. Sato, N. Zhang, H. Suzuki, Naoki Fukuda, Masahiro Yasuda, Z. Elekes, Yuya Kubota, D. S. Ahn, I. C. Stefanescu, H. N. Liu, T. Harada, Zaihong Yang, L. Stuhl, J. Zenihiro, D. Kim, Masaki Sasano, I. S. Hahn, Antti Saastamoinen, H. Murakami, Toshio Kobayashi, Tomohiro Uesaka, P. J. Li, Y. Shimizu, Yasuhiro Togano, Y. L. Sun, T. Nakamura, V. Panin, K. Y. Chae, Z. Halasz, A. Spiridon, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Physics, Proton–proton chain reaction, Proton, 010308 nuclear & particles physics, Monte Carlo method, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Breakup, 7. Clean energy, 01 natural sciences, Nuclear physics, Reaction rate, Nucleosynthesis, 0103 physical sciences, Coulomb, Radiative transfer, 010306 general physics, Nuclear Experiment
Abstract

International audience; The 9C breakup reaction was investigated in order to obtain information about the inverse reaction: 8B(p,γ)9C at astro-physical energies within the NP1412SAMURAI29R1 experiment. The 8B(p,γ)9C reaction gives a possible path to the hot pp chain pp-IV at high temperatures and away from it toward a rapid alpha-process rap-I at high temperatures and densities and therefore is important in understanding nucleosynthesis in super-massive hot stars in the early universe, including possible bypass of the 3α-process. For this experiment it was proposed to use a combination of nuclear and Coulomb dissociation measurements (on a light target Be or C and on a heavy target Pb, respectively) at energy of 160 A MeV to extract structure information, which will allow to evaluate the radiative proton capture cross section at low energies and from there the reaction rate. The current work is focused on the development of Monte Carlo simulations for Coulomb breakup mechanism of 9C as well as on the Geant4 simulations of the resulting particle trajectories through the experimental setup, including passage of the particles through the magnetic field of the SAMURAI spectrometer.

Published
2018

92. Proton elastic scattering at 200 A MeV and high momentum transfers of 1.7–2.7 fm−1 as a probe of the nuclear matter density of 6He

Author

Yohei Shimizu, Zh Yang, Masaki Sasano, K. Yoneda, Y. Ando, T. Akieda, S. Nakai, Masanori Dozono, T. Tomai, A. Galindo-Uribarri, I. Stefan, Atsumi Saito, H. Sato, M. Yasuda, Kaori Kaki, Kenjiro Miki, A. Ni, Yuya Kubota, Yosuke Kondo, S. Leblond, Didier Beaumel, Kimiko Sekiguchi, N. Chiga, Juzo Zenihiro, A. Watanabe, Tetsuo Noro, Takashi Kobayashi, Satoshi Sakaguchi, L. Stuhl, Shoichiro Kawase, Yohei Matsuda, S. Park, Satoru Terashima, Shuichi Ota, W. Kim, T. Lokotko, V. Panin, T. Mukai, T. Wakui, B. Heffron, Kenichiro Tateishi, Tomotsugu Wakasa, Motonobu Takaki, T. Ozaki, H. Sakai, Yukie Maeda, Tomohiro Uesaka, H. Kon, Yoshiki Wada, Hideaki Otsu, T. Motobayashi, J. Yasuda, E. Milman, S. Chebotaryov, K. Taniue, A. Hirayama, H. Lee, Takashi Nakamura, Tadaaki Isobe, H. Yamada, Yasuhiro Togano, M. Assie, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Elastic scattering, Physics, Inverse kinematics, 010308 nuclear & particles physics, D27 Reactions induced by unstable nuclei, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Impulse (physics), Nuclear matter, 7. Clean energy, 01 natural sciences, Computational physics, medicine.anatomical_structure, 0103 physical sciences, medicine, D11 Models of nuclear structure, Neutron, Halo, Nuclear Experiment, 010306 general physics, Nucleus, Order of magnitude
Abstract

International audience; Differential cross sections of p–6He elastic scattering were measured in inverse kinematics at an incident energy of 200 A MeV, covering the high momentum transfer region of 1.7–2.7 fm−1. The sensitivity of the elastic scattering at low and high momentum transfers to the density distribution was investigated quantitatively using relativistic impulse approximation calculations. In the high momentum transfer region, where the present data were taken, the differential cross section has an order of magnitude higher sensitivity to the inner part of the 6He density relative to the peripheral part (15:1). This feature makes the obtained data valuable for the deduction of the inner part of the 6He density. The data were compared to a set of calculations assuming different proton and neutron density profiles of 6He. The data are well reproduced by the calculation assuming almost the same profiles of proton and neutron densities around the center of 6He, and a proton profile reproducing the known point-proton radius of 1.94 fm. This finding is consistent with the assumption that the 6He nucleus consists of a rigid α-like core with a two-neutron halo.

Published
2018

93. Excitation of the Isovector Spin Monopole Resonance via the Exothermic Zr90(N12,C12) Reaction at 175 MeV/u

Author

Naoki Fukuda, Y. Yanagisawa, Remco Zegers, Kenichi Yoshida, Tomohiro Uesaka, Hiroaki Matsubara, Satoshi Sakaguchi, Shin'ichiro Michimasa, G. P. A. Berg, Naohito Inabe, H. W. Wang, Shoichiro Kawase, Kenjiro Miki, Shumpei Noji, Motonobu Takaki, Yukie Maeda, Hiroyuki Takeda, Hiroshi Tokieda, Nori Aoi, Masanori Dozono, K. Yako, N. Yokota, Toshiyuki Kubo, Y. Kikuchi, K. Kisamori, Satoshi Takeuchi, D. Kameda, Yoshiko Sasamoto, Takeo Kawabata, Hiroyuki Miya, Shuichi Ota, P. Doornenbal, Hideyuki Sakai, Susumu Shimoura, Tsuyoshi Ohnishi, H. Baba, and H. Miyasako

Subjects
Exothermic reaction, Physics, Isovector, 010308 nuclear & particles physics, Nuclear Theory, Magnetic monopole, General Physics and Astronomy, Resonance, Nuclear matter, 01 natural sciences, Spectral line, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Excitation
Abstract

The (^{12}N, ^{12}C) charge-exchange reaction at 175 MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and asymmetric nuclear matter. This probe, now available through the production of ^{12}N as a secondary rare-isotope beam, is exothermic, is strongly absorbed at the surface of the target nucleus, and provides selectivity for spin-transfer excitations. All three properties enhance the excitation of the IVSMR compared to other, primarily light-ion, probes, which have been used to study the IVSMR thus far. The ^{90}Zr(^{12}N,^{12}C) reaction was measured and the excitation energy spectra up to about 70 MeV for both the spin-transfer and non-spin-transfer channels were deduced separately by tagging the decay by γ emission from the ^{12}C ejectile. Besides the well-known Gamow-Teller and isobaric analog transitions, a clear signature of the IVSMR was identified. By comparing with the results from light-ion reactions on the same target nucleus and theoretical predictions, the suitability of this new probe for studying the IVSMR was confirmed.

Published
2018

94. Spectroscopy of Pionic Atoms in Sn122(d,He3) Reaction and Angular Dependence of the Formation Cross Sections

Author

Hiroaki Matsubara, Yasumoto Tanaka, Kenjiro Miki, M. Iwasaki, N. Ikeno, Ryugo S. Hayano, Hiroyuki Fujioka, Shumpei Noji, Naoki Fukuda, Shoichiro Kawase, Shin'ichiro Michimasa, Shigeru Itoh, Tomohiro Uesaka, K. Tsukada, K. Itahashi, Hiroyuki Takeda, Go Mishima, Kenichi Yoshida, K Ichikawa, N. Sakamoto, Shuichi Ota, Kota Okochi, Yuni N. Watanabe, T. Nishi, Masao Nakamura, Satoru Hirenzaki, Hans Geissel, Naohito Inabe, K. Todoroki, D. Kameda, Helmut Weick, Ken Suzuki, Hiroyuki Miya, H. Yamakami, Kensuke Kusaka, Takashi Kubo, Hideko Nagahiro, Nobuhisa Fukunishi, and G. P. A. Berg

Subjects
Nuclear reaction, Physics, Isotope, Spectrometer, 010308 nuclear & particles physics, Binding energy, General Physics and Astronomy, 01 natural sciences, Deuterium, 0103 physical sciences, Mass spectrum, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Beam (structure)
Abstract

We observed the atomic 1s and 2p states of π^{-} bound to ^{121}Sn nuclei as distinct peak structures in the missing mass spectra of the ^{122}Sn(d,^{3}He) nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. The 2p state in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionic 1s state.

Published
2018

95. Systematic analysis of inelastic α scattering off self-conjugate A=4n nuclei

Author

H. Matsuno, Yoshiko Sasamoto, K. Inaba, Tatsuya Furuno, T. Nanamura, S. Adachi, Shigeo Yoshida, Kichiji Hatanaka, Keigo Kawase, Hiroaki Matsubara, T. Baba, K. Suda, Tomohiro Uesaka, Toshikazu Hashimoto, M. Murata, Y. Ishii, Y. Shimizu, H. Fujimura, Yohei Matsuda, T. Kadoya, Hidetoshi Akimune, Tatsuya Morimoto, Hisataka Yoshida, Takeo Kawabata, N. Yokota, Hiroyuki Morita, Masatoshi Itoh, Kosho Minomo, Yuji Tameshige, Yasuro Funaki, Chihiro Iwamoto, Ryu Sawada, Satoshi Sakaguchi, M. Fujiwara, Yukie Maeda, M. Uchida, I. Ou, Atsushi Tamii, and M. Tsumura

Subjects
Physics, 010308 nuclear & particles physics, Scattering, 0103 physical sciences, State (functional analysis), Atomic physics, Nuclear Experiment, 010306 general physics, 01 natural sciences
Abstract

We systematically measured the differential cross sections of inelastic $\ensuremath{\alpha}$ scattering off self-conjugate $A=4n$ nuclei at two incident energies ${E}_{\ensuremath{\alpha}}=130\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ and $386\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ at Research Center for Nuclear Physics, Osaka University. The measured cross sections were analyzed by the distorted-wave Born-approximation (DWBA) calculation using the single-folding potentials, which are obtained by folding macroscopic transition densities with the phenomenological $\ensuremath{\alpha}N$ interaction. The DWBA calculation with the density-dependent $\ensuremath{\alpha}N$ interaction systematically overestimates the cross sections for the $\mathrm{\ensuremath{\Delta}}L=0$ transitions. However, the DWBA calculation using the density-independent $\ensuremath{\alpha}N$ interaction reasonably well describes all the transitions with $\mathrm{\ensuremath{\Delta}}L=0$--4. We examined uncertainties in the present DWBA calculation stemming from the macroscopic transition densities, distorting potentials, phenomenological $\ensuremath{\alpha}N$ interaction, and coupled channel effects in $^{12}\mathrm{C}$. It was found that the DWBA calculation is not sensitive to details of the transition densities nor the distorting potentials, and the phenomenological density-independent $\ensuremath{\alpha}N$ interaction gives reasonable results. The coupled-channel effects are negligibly small for the ${2}_{1}^{+}$ and ${3}_{1}^{\ensuremath{-}}$ states in $^{12}\mathrm{C}$, but not for the ${0}_{2}^{+}$ state. However, the DWBA calculation using the density-independent interaction at ${E}_{\ensuremath{\alpha}}=386\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ is still reasonable even for the ${0}_{2}^{+}$ state. We concluded that the macroscopic DWBA calculations using the density-independent interaction are reliably applicable to the analysis of inelastic $\ensuremath{\alpha}$ scattering at ${E}_{\ensuremath{\alpha}}\ensuremath{\sim}100\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/\mathrm{u}$.

Published
2018

96. Tracking with the MINOS Time Projection Chamber

Author

Masaki Sasano, A. Giganon, C. S. Lee, D. Calvet, C. Santamaria, A. Gillibert, T. Motobayashi, Yuya Kubota, E. Takada, H. N. Liu, F. Château, E. C. Pollacco, Yosuke Kondo, P. Doornenbal, Hideaki Otsu, V. Lapoux, A. Obertelli, M. Kurata-Nishimura, D. Leboeuf, L. Audirac, Juzo Zenihiro, Hidetada Baba, Masafumi Matsushita, G. Prono, Shuichi Ota, Alan Peyaud, A. Corsi, C. Lahonde-Hamdoun, Megumi Niikura, Tomohiro Uesaka, A. Delbart, Hiroshi Tokieda, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, Vertex (computer graphics), Physics::Instrumentation and Detectors, vertex detector, Tracking software, Tracking (particle physics), 7. Clean energy, 01 natural sciences, programming, Nuclear physics, benchmark, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Spectroscopy, numerical calculations, Instrumentation, spatial resolution, Physics, MINOS, Time projection chamber, 010308 nuclear & particles physics, Scattering, track data analysis, time projection chamber, Full width at half maximum, Hough transform, efficiency, Spectroscopy of exotic nuclei, Physics::Accelerator Physics, Nucleon, performance
Abstract

We report on the performance of the MINOS Time Projection Chamber developed as a vertex tracker to study exotic nuclei produced from hydrogen-induced knockout via in-beam γ -ray and invariant-mass spectroscopy . In-beam measurements with 4 He and 20Ne beams at 200 and 350 MeV/nucleon, respectively, were performed at the HIMAC facility. The tracking algorithm for protons after quasi-free scattering is described. Realistic simulations and physics experiments are compared and show a good agreement. The vertex position resolution reaches 5 mm FWHM, mostly from re-scattering with the target and the Aluminum reaction chamber. The overall efficiency of vertex reconstruction is also benchmarked with the first experimental campaign data performed at the RIBF, confirming an overall efficiency better than 90% for physics experiments.

Published
2018

97. Exclusive quasi-free proton knockout from oxygen isotopes at intermediate energies

Author

Kazuyuki Ogata, Shinsuke Ota, T. Fukunaga, Juzo Zenihiro, C. S. Lee, S. S. Stepanyan, T. Suzuki, Masaki Sasano, Takashi Wakui, Masanori Dozono, Elizabeth Padilla-Rodal, N. Inabe, Hiroshi Tokieda, Motonobu Takaki, Yukie Maeda, Naoki Fukuda, A. Galindo-Uribarri, W. Kim, Kensuke Kusaka, Kazuki Yoshida, Atsushi Tamii, Tomotsugu Wakasa, Rin Yokoyama, Yoshiyuki Yanagisawa, Hiroyuki Takeda, Tetsuo Noro, Satoshi Sakaguchi, Y. Nozawa, T. L. Tang, Koichi Yoshida, Shin'ichiro Michimasa, Didier Beaumel, J. Yasuda, Alexandre Obertelli, Hiroaki Matsubara, Hiroshi Suzuki, Motoki Kobayashi, K. Kisamori, T. Kawahara, Kentaro Yako, Toshiyuki Kubo, Hiroyuki Miya, Takahiro Kawabata, Yuki Kubota, T. Fujii, Shoichiro Kawase, Tomohiro Uesaka, Hideyuki Sakai, Susumu Shimoura, Sanghoon Hwang, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, D13 Stable and unstable nuclei, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, D27 Reactions induced by unstable nuclei, Impulse (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Isotopes of oxygen, 13. Climate action, Ab initio quantum chemistry methods, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

International audience; The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on 14,16,18,22,24O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, e p) reaction on stable targets and with the predictions of recent ab initio calculations.

Published
2018

98. Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

Author

R. Lozeva, M. Lettmann, J.-Y. Roussé, Tadaaki Isobe, Pieter Doornenbal, F. Nowacki, Zena Patel, Satoshi Takeuchi, H. Otsu, K. Matsui, M. L. Cortés, K. Yoneda, C. Santamaria, S. Franchoo, Tohru Motobayashi, Hidetada Baba, E. Sahin, Hiroyoshi Sakurai, Shuichi Ota, C. Péron, S. Nishimura, G. Authelet, F. Giacoppo, Shunpei Koyama, E. C. Pollacco, Alan Peyaud, Jin Wu, L. X. Chung, H. Wang, F. Château, F. Browne, Ryo Taniuchi, J. M. Gheller, Marc Dupuis, T. Sumikama, V. Lapoux, D. Calvet, Zs. Vajta, David Steppenbeck, A. Gillibert, A. Obertelli, Daisuke Suzuki, A. Gottardo, P. A. Söderström, Jenny Lee, S. M. Lenzi, Yoshiaki Shiga, A. Corsi, Kathrin Wimmer, K. Hadynska-Klek, Yuya Kubota, Megumi Niikura, Sophie Péru, Tomohiro Uesaka, I. Stefan, Zs. Dombrádi, C. M. Shand, Norbert Pietralla, A. Delbart, V. Werner, Z. Korkulu, Zhengyu Xu, T. Miyazaki, M. Matsushita, L. Olivier, C. Louchart, Masaki Sasano, Satoru Momiyama, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, Nuclear Theory, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Isotopes of zinc, Gamma spectroscopy, Neutron, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

International audience; Proton inelastic scattering of Ni72,74 and Zn76,80 ions at energies around 235 MeV/nucleon was performed at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. Angular integrated cross sections for direct inelastic scattering to the 21+ and 41+ states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, was used together with neutron and proton densities stemming from quasiparticle random-phase approximation (QRPA) calculations to interpret the experimental cross sections and to infer neutron to proton matrix element ratios. In addition, coupled-channels calculations with a phenomenological potential were used to determine deformation lengths. For the Ni isotopes, correlations favor neutron excitations, thus conserving the Z=28 gap. A dominance of proton excitation, on the other hand, is observed in the Zn isotopes, pointing to the conservation of the N=50 gap approaching Ni78. These results are in agreement with QRPA and large-scale shell-model calculations.

Published
2018

99. Complete set of deuteron analyzing powers from d⃗p elastic scattering at 190 MeV/nucleon

Author

Masaki Sasano, H. Kon, D. Eto, Kimiko Sekiguchi, Hiroshi Suzuki, T. Akieda, M. Tabata, Tomotsugu Wakasa, Y. Wada, A. Watanabe, Henryk Witała, R. Skibiński, Kentaro Yako, Hideyuki Sakai, S. Kawakami, Kenjiro Miki, Satoshi Sakaguchi, Tomohiro Uesaka, Yuya Kubota, Tatsuya Yamamoto, Naoya Sakamoto, Masanori Dozono, Y. Yanagisawa, Yukie Maeda, J. Yasuda, A. Ohkura, S. Chebotaryov, Hiroyuki Kamada, Y. Shindo, E. Milman, and Jacek Golak

Subjects
Nuclear physics, Elastic scattering, Physics, Set (abstract data type), Deuterium, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Nucleon, 01 natural sciences
Published
2017

100. Exploring the Most Exotic Nuclei with MINOS at the RIBF

Author

Alexandre Obertelli and Tomohiro Uesaka

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Atomic orbital, Proton, MINOS, Nuclear Theory, Atomic nucleus, Binding energy, Neutron, Nuclear Experiment, Nucleon, Fermi Gamma-ray Space Telescope
Abstract

Rare isotopes, both by their significant neutron-over-proton unbalance or their weak binding, offer unique features to understand atomic nuclei. The completion of facilities dedicated to produce radioactive ion beams worldwide has allowed one to span new regions of the nuclear landscape where new properties of nuclei, in particular the evolution of shell structure, can be investigated. It is now established that the nuclear shell structure, as unraveled from stable nuclei, is not universal across the entire nuclear chart but evolves depending on which neutron and proton orbitals are occupied. Intensive theoretical efforts driven by new experimental findings have led to clarification of microscopic mechanisms for such changes and their predictions are confronted to further observations. Away from stability, the shell model picture of a nucleus can also be subject to significant modifications due to low binding energy of Fermi nucleons. New phenomena have been observed in the past decades. The development o...

Published
2015

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