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1. Evaluation of the K35(p,γ)Ca36 reaction rate using the Ca37(p,d)Ca36 transfer reaction

Author

J. Pancin, L. Lalanne, Tomoki Saito, Franck Delaunay, Julien Gibelin, Megumi Niikura, B. Mauss, A. Lemasson, Daisuke Suzuki, N. Kitamura, O. Sorlin, Didier Beaumel, Jérôme Guillot, J. C. Thomas, André Palma da Cunha Matta, P. Morfouace, F. de Oliveira Santos, S. Franchoo, C. Stodel, A. Poves, N. de Sereville, M. Assié, F. Hammache, Y. Blumenfeld, F. Flavigny, V. Lapoux, O. Kamalou, V. Girard-Alcindor, B. A. Brown, Shoko Koyama, and T. Roger

Subjects
Physics, Range (particle radiation), Proton, 010308 nuclear & particles physics, Resonance, Light curve, 01 natural sciences, 7. Clean energy, Atomic mass, Charged particle, Reaction rate, Recoil, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Background: A recent sensitivity study has shown that the K35(p,γ)Ca36 reaction is one of the ten (p,γ) reaction rates that could significantly impact the shape of the calculated x-ray burst light curve. Its reaction rate used up to now in type I x-ray burst calculations was estimated using an old measurement for the mass of Ca36 and theoretical predictions for the partial decay widths of the first 2+ resonance with arbitrary uncertainties. Purpose: In this work, we propose to reinvestigate the K35(p,γ)Ca36 reaction rate, as well as related uncertainties, by determining the energies and decay branching ratios of Ca36 levels, within the Gamow window of x-ray bursts, in the 0.5 to 2 GK temperature range. Method: These properties were studied by means of the one-neutron pickup transfer reaction Ca37(p,d)Ca36 in inverse kinematics using a radioactive beam of Ca37 at 48 MeV nucleon−1. The experiment was performed at the GANIL facility using the liquid hydrogen target CRYPTA, the MUST2 charged particle detector array for the detection of the light charged particles, and a zero degree detection system for the outgoing heavy recoil nuclei. Results: The atomic mass of Ca36 is confirmed and new resonances have been proposed together with their proton decay branching ratios. This spectroscopic information, used in combination with very recent theoretical predictions for the γ-decay width, were used to calculate the K35(p,γ)Ca36 reaction rate. The recommended rate of the present work was obtained within a uncertainty factor of 2 at 1σ. This is consistent with the previous estimate in the x-ray burst temperature range. A large increase of the reaction rate was found at higher temperatures due to two newly discovered resonances. Conclusions: The K35(p,γ)Ca36 thermonuclear reaction rate is now well constrained by the present work in a broad range of temperatures covering those relevant to type I x-ray bursts. Our results show that the K35(p,γ)Ca36 reaction does not affect the shape of the x-ray burst light curve, and that it can be removed from the list of the few influential proton radiative captures reactions having a strong impact on the light curve.

Published
2021
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2. Charged-particle branching ratios above the neutron threshold in F19 : Constraining N15 production in core-collapse supernovae

Author

I. Matea, A. Gottardo, I. Sivacek, Mahmoud Mahgoub, M. Assié, S. Gillespie, L. Olivier, F. Hammache, M. Degerlier, V. Alcindor, I. Stefan, C. Delafosse, Didier Beaumel, A. Georgiadou, Jérôme Guillot, R. Garg, Marin Chabot, J. Riley, T. Faestermann, Alison Laird, L. Perrot, Valdir Guimaraes, F. Flavigny, Ralf Hertenberger, J. Kiener, P. Adsley, A. Lefebvre-Schuhl, N. de Sereville, Vincent Tatischeff, H.-F. Wirth, Arnd Meyer, and S. P. Fox

Subjects
Physics, 010308 nuclear & particles physics, Inelastic scattering, Branching (polymer chemistry), 01 natural sciences, Charged particle, Nuclear physics, Supernova, Nucleosynthesis, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment, 010306 general physics, Ground state
Abstract

Spatially-correlated overabundances of $^{15}$N and $^{18}$O observed in some low-density graphite meteoritic grains have been connected to nucleosynthesis taking place in the helium-burning shell during core-collapse supernovae. Two of the reactions which have been identified as important to the final abundances of $^{15}$N and $^{18}$O are $^{18}$F($n,\alpha$)$^{15}$N and $^{18}$F($n,p$)$^{18}$O. The relative strengths of the $^{18}$F($n,\alpha$)$^{15}$N and $^{18}$F($n,p$)$^{18}$O reactions depend on the relative $\alpha_0$ and $p_0$ decays from states above the neutron threshold in $^{19}$F in addition to other properties. Experimental data on the charged-particle decays from these highly excited states are lacking or inconsistent. Two experiments were performed using proton inelastic scattering from LiF targets and magnetic spectrographs. The first experiment used the high-resolution Q3D spectrograph at Munich to constrain properties of levels in $^{19}$F. A second experiment using the Orsay Split-Pole spectrograph and an array of silicon detectors was performed in order to measure the charged-particle decays of neutron-unbound levels in $^{19}$F. A number of levels in $^{19}$F have been identified along with their corresponding charged-particle decays. The first state above the neutron threshold which has an observed proton-decay branch to the ground state of $^{18}$O lies 68 keV above the neutron threshold while the $\alpha$-particle decays from the neutron-unbound levels are generally observed to be much stronger than the proton decays. Neutron-unbound levels in $^{19}$F are observed to decay predominantly by $\alpha$-particle emission, supporting the role of $^{18}$F($n,\alpha$)$^{15}$N in the production of $^{15}$N in the helium-burning shell of supernovae. Improved resonant-scattering reaction data are required in order to be able to determine the reaction rates accurately.

Published
2021
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3. Experimental Study of $^{4}n$ by Directly Detecting the Decay Neutrons

Author

Atsumi Saito, Yohei Shimizu, H. Törnqvist, B. Monteagudo, T. Isobe, M. Caamaño, H. Scheit, S. Kiyotake, J. Tscheuschner, M. L. Cortés, F. M. Marqués, N. Fukuda, N. A. Orr, J. M. Gheller, A. Gillibert, A. Matta, K. Yoneda, L. Stuhl, Z. Elekes, I. Kuti, V. Wagner, M. Miwa, Z. Halász, A. Obertelli, S. Kim, A. Revel, L. Zanetti, N. L. Achouri, S. Takeuchi, F. Dufter, C. A. Douma, S. Masuoka, Stefanos Paschalis, R. Gernhäuser, S. Chen, Nobuyuki Chiga, S. Storck, T. Shimada, M.N. Harakeh, P. Koseoglou, T. Harada, B. Yang, M. Matsumoto, H. Takeda, D. S. Ahn, Yuya Kubota, H. Yamada, Yasuhiro Togano, A. Hirayama, Y. Yasuda, T. Fujino, D. M. Rossi, Nasser Kalantar-Nayestanaki, J. Tanaka, M. Böhmer, N. Inabe, Didier Beaumel, S. Park, Thomas Aumann, H. Baba, Tomohiro Uesaka, F. Schindler, J. Feng, Zaihong Yang, I. Murray, Julien Gibelin, K. Boretzky, S. W. Huang, B. Fernández-Domínguez, S. Reichert, Takashi Nakamura, Yu-xin Liu, K. Wimmer, Yukie Maeda, L. Yang, H. Sato, E. Tronchin, P. Doornenbal, Dmytro Symochko, D. Cortina, J. Kahlbow, S. Shimoura, H. Suzuki, Hideaki Otsu, M. Potlog, P. J. Li, J. Mayer, H. Miki, Masaki Sasano, Toshio Kobayashi, Z. Ge, D. Kim, Juzo Zenihiro, T. Tomai, I. Stefan, M. Parlog, H. Simon, V. Panin, Igor Gašparić, C. Lehr, Yosuke Kondo, C. Lenain, U. Forsberg, 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), 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), Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Nuclear structure and force, tetraneutron, direct reactions, radioactive beams, Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, Tetraneutron, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 3. Good health
Abstract

The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on $$^{8}$$ He(p, 2p) $$^{7}$$ H{t+ $$^{4}n$$ } 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.

Published
2021
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4. How Different is the Core of F25 from Og.s.24 ?

Author

W. Kim, Rin Yokoyama, K. Kisamori, S. S. Stepanyan, T. Kawahara, Naoki Fukuda, Tomohiro Uesaka, Hiroyuki Miya, D. Kameda, Kenichi Yoshida, Takashi Kubo, Shuichi Ota, Susumu Shimoura, Motonobu Takaki, Yukie Maeda, Hideyuki Sakai, A. Galindo-Uribarri, Kazuyuki Ogata, Shin'ichiro Michimasa, Tomotsugu Wakasa, Sanghoon Hwang, J. Yasuda, T. L. Tang, Yuya Kubota, Hiroshi Tokieda, Masanori Dozono, Kensuke Kusaka, Juzo Zenihiro, T. Fukunaga, Hiroshi Matsubara, Y. Yanagisawa, Didier Beaumel, Elizabeth Padilla-Rodal, A. Obertelli, Naohito Inabe, Hiroyuki Takeda, Motoki Kobayashi, C. S. Lee, T. Fujii, Takashi Wakui, Kentaro Yako, Tetsuo Noro, Satoshi Sakaguchi, Shoichiro Kawase, Masaki Sasano, and Hiroshi Suzuki

Subjects
Physics, Proton, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, 3. Good health, Core (optical fiber), Crystallography, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Neutron, Anomaly (physics), 010306 general physics, Ground state, Nuclear theory, Nucleus
Abstract

The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.

Published
2020
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5. The MUGAST-AGATA-VAMOS campaign: Set-up and performances

Author

D. Mengoni, C. Nicolle, F. Flavigny, F. Noury, N. de Séréville, J.S. Rojo, L. Ménager, J. Goupil, A. Goasduff, F. de Oliveira, F. Hammache, M. Assié, A. Korichi, W. N. Catford, J. Dudouet, L. Lalanne, E. Rindel, L. Vatrinet, Y. Blumenfeld, G. Frémont, V. Girard-Alcindor, D. Ramos, D. Brugnara, A. Matta, B. Fernández-Domínguez, A. Raggio, F. Legruel, F. Didierjean, S. Leblond, P. R. John, A. Lefevre, C. Fougères, M. Stanoiu, C. Lenain, A. Gottardo, I. Zanon, I. Stefan, A. Giret, E. Rauly, C. Aa. Diget, R. Borcea, Franck Delaunay, J. Casal, F. Galtarossa, M. Siciliano, K. Rezynkina, Didier Beaumel, B. Million, Eric Clément, A. Lemasson, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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 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 des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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, 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-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, Physics - Instrumentation and Detectors, Photon, FOS: Physical sciences, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Spectrometer, Particle identification, symbols.namesake, Optics, 0103 physical sciences, Solid-state detectors, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electronics, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, business.industry, Direct nuclear reactions, Triple coincidences, Instrumentation and Detectors (physics.ins-det), symbols, AGATA, business, Doppler effect
Abstract

The MUGAST-AGATA-VAMOS set-up at GANIL combines the MUGAST highly-segmented silicon array with the state-of-the-art AGATA array and the large acceptance VAMOS spectrometer. The mechanical and electronics integration copes with the constraints of maximum efficiency for each device, in particular {\gamma}-ray transparency for the silicon array. This complete set-up offers a unique opportunity to perform exclusive measurements of direct reactions with the radioactive beams from the SPIRAL1 facility. The performance of the set-up is described through its commissioning and two examples of transfer reactions measured during the campaign. High accuracy spectroscopy of the nuclei of interest, including cross-sections and angular distributions, is achieved through the triple-coincidence measurement. In addition, the correction from Doppler effect of the {\gamma}-ray energies is improved by the detection of the light particles and the use of two-body kinematics and a full rejection of the background contributions is obtained through the identification of heavy residues. Moreover, the system can handle high intensity beams (up to 108 pps). The particle identification based on the measurement of the time-of-flight between MUGAST and VAMOS and the reconstruction of the trajectories is investigated., Comment: 13 pages, 18 figures

Published
2021
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6. $\alpha$-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
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7. $\alpha$-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
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8. 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
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9. 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
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10. Second0+state of unboundO12: Scaling of mirror asymmetry

Author

F. Naqvi, V. Lapoux, Y. Blumenfeld, N. de Sereville, H. Okamura, A. Matta, Satoru Terashima, A. Drouart, Dan-Yang Pang, O. Sorlin, I. Stefan, Hiroyoshi Sakurai, M. Assié, M. Hackstein, J. Guillot, S. Giron, P. C. Srivastava, A. Ramus, S. Franchoo, H. Baba, Julien Gibelin, F. de Oliveira Santos, L. Perrot, C. M. Petrache, Shin'ichiro Michimasa, N. Keeley, A. Gillibert, Y. Tanimura, D. Suzuki, J. A. Scarpaci, C. Stodel, F. Maréchal, J. Pancin, H. Iwasaki, Hideaki Otsu, L. Nalpas, P. Roussel-Chomaz, E. C. Pollacco, Didier Beaumel, W. Rother, S. Grévy, and F. Hammache

Subjects
Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Binding energy, Parity (physics), 01 natural sciences, 7. Clean energy, Asymmetry, 0103 physical sciences, Nuclear drip line, Atomic physics, Born approximation, Nuclear Experiment, 010306 general physics, Mirror symmetry, Scaling, Excitation, media_common
Abstract

The unbound O12 nucleus was studied via the two-neutron transfer (p,t) reaction in inverse kinematics using a radioactive O14 beam at 51 MeV/u. Excitation energy spectra and differential cross sections were deduced by the missing mass method using MUST2 telescopes. We achieved much higher statistics compared to the previous experiments of O12, which allowed accurate determination of resonance energy and unambiguous spin and parity assignment. The O12 resonance previously reported using the same reaction was confirmed at an excitation energy of 1.62±0.03(stat.)±0.10(syst.). MeV and assigned spin and parity of 0+ from a distorted-wave Born approximation analysis of the differential cross sections. Mirror symmetry of O12 with respect to its neutron-rich partner Be12 is discussed from the energy difference of the second 0+ states. In addition, from systematics of known 0+ states, a distinct correlation is revealed between the mirror energy difference and the binding energy after carrying out a scaling with the mass and the charge. We show that the mirror energy difference of the observed 0+ state of O12 is highly deviated from the systematic trend of deeply bound nuclei and in line with the scaling relation found for weakly bound nuclei with a substantial 2s1/2 component. The importance of the scaling of mirror asymmetry is discussed in the context of ab initio calculations near the drip lines and universality of few-body quantum systems.

Published
2016
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11. High-spin states inLa136and possible structure change in theN=79region

Author

K. Tajiri, N. Hamatani, D. Guinet, Yoshiaki Ito, J. Takatsu, P. Désesquelles, Shin-Ichiro Nishimura, D. Curien, K. Yoshinaga, Rin Yokoyama, Eiji Ideguchi, R. Leguillon, Tadashi Shimoda, Yusuke Wakabayashi, Hiroki Nishibata, Takashi Suzuki, Koji Higashiyama, Atsuko Odahara, Didier Beaumel, G. Lehaut, C. M. Petrache, Hiroshi Watanabe, and Naotaka Yoshinaga

Subjects
Physics, Nuclear and High Energy Physics, Spin states, 010308 nuclear & particles physics, SHELL model, Structure (category theory), State (functional analysis), 01 natural sciences, Molecular physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Level structure, 010306 general physics, Spin (physics), Nucleus, Line (formation)
Abstract

High-spin states in the odd-odd nucleus La136, which is located close to the β-stability line, have been investigated in the radioactive-beam-induced fusion-evaporation reaction Sn124(N17,5n). The use of the radioactive beam enabled a highly sensitive and successful search for a new isomer [14+,T1/2=187(27) ns] in La136. In the A=130–140 mass region, no such long-lived isomer has been observed at high spin in odd-odd nuclei. The La136 level scheme was revised, incorporating the 14+ isomer and six new levels. The results were compared with pair-truncated shell model (PTSM) calculations which successfully explain the level structure of the πh11/2⊗νh−111/2 bands in La132 and La134. The isomerism of the 14+ state was investigated also by a collective model, the cranked Nilsson-Strutinsky (CNS) model, which explains various high-spin structures in the medium-heavy mass region. It is suggested that a new type of collective structure is induced in the PTSM model by the increase of the number of πg7/2 pairs, and/or in the CNS model by the configuration change associated with the shape change in La136.

Published
2015
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12. Missing mass spectroscopy of $^{8}$He and $^{10}$He by (d,$^{3}$He) reaction

Author

Franck Delaunay, Hua-Lei Wang, Nagao Kobayashi, L. Nalpas, I. Stefan, J.H. Lee, J. A. Scarpaci, T. Sako, R. J. Chen, E. A. Kuzmin, K. Yoneda, André Palma da Cunha Matta, M. Assié, S. Franchoo, Shuichi Takeuchi, E. Yu. Nikolskii, E. C. Pollacco, S. Boissinot, M. Kurata-Nishimura, N. Imai, Daisuke Suzuki, Takashi Kubo, Didier Beaumel, L. H. Khiem, A. M. Sánchez-Benítez, P. Gangnant, C. Houarner, F. Hammache, V. Lapoux, Hideaki Otsu, Hiroyoshi Sakurai, T. Motobayashi, Ph. Rosier, Julien Gibelin, Yosuke Kondo, A. Obertelli, Y. Kawada, Natalia Timofeyuk, Kazutaka Takahashi, E. Rindel, Nori Aoi, J. F. Libin, H. Baba, M. Takechi, N. de Séréville, R. Wolski, Terutaro Nakamura, F. Saillant, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
010308 nuclear & particles physics, Chemistry, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Mass spectrometry, 01 natural sciences, Resonance (particle physics), transfer reaction, 3. Good health, resonance, 0103 physical sciences, nuclear structure, Mass spectrum, Atomic physics, 010306 general physics, Nucleon, Nuclear Experiment, Energy (signal processing), Excitation
Abstract

International audience; We present the first missing mass spectrum of the unbound system 10He obtained from one nucleon transfer $^{11}$Li(d,$^{3}$He) reaction at 50 A MeV. We found rather large yields for the $^{6}$He + 4n decay channel especially for higher excitation energy, which suggest the importance of the $^{6}$He + 4n structure in $^{10}$He.

Published
2014
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13. Single-particle strength in neutron-rich $^{71}$Cu from the (d, $^{3}$He) proton pick-up reaction

Author

M. Stanoiu, F. Azaiez, G. Marquínez-Durán, A. Gillibert, P. Morfouace, S. Franchoo, J. A. Scarpaci, C. Louchart, D. Mengoni, D. Sohler, I. Matea, Zsolt Dombrádi, L. Nalpas, J. C. Thomas, Zs. Vajta, N. de Séréville, F. Hammache, S. Boissinot, F. Recchia, M. Assié, L. Caceres, D. R. Napoli, R. Borcea, A. M. Sánchez-Benítez, S. Grévy, B. Fernandez-Dominguez, S. Giron, O. Kamalou, I. Martel-Bravo, V. Lapoux, Didier Beaumel, A. Lepailleur, C. Stodel, Megumi Niikura, O. Sorlin, I. Stefan, L. Lefebvre, J. Elseviers, G. Burgunder, 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), 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), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-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 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), GANILEXP, 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), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, History, Proton, Inverse kinematics, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Computer Science Applications, Education, Cross section (physics), Low energy, 0103 physical sciences, Particle, Neutron, Born approximation, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

Expérience GANIL/MUST2; International audience; We have measured the 72Zn(d, 3He) 71Cu proton pickup reaction in inverse kinematics at 38 MeV/u. A dedicated setup was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions in the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf5/2 orbital, the πf7/2 single-particle strength is not appreciably affected by the addition of neutrons beyond N = 40.

Published
2014
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14. Signature of a two-phonon state through its proton decay pattern

Author

M. Lamehi-Rachti, T. Suomijärvi, P. Massolo, Ph. Chomaz, A. Gillibert, A. van der Woude, J.C. Roynette, Didier Beaumel, Y. Blumenfeld, J. A. Scarpaci, I. Lhenry, J.P. Garron, N. Frascaria, N. Alamanos, 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), 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), 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, Decay scheme, Proton, 010308 nuclear & particles physics, Proton decay, Isoscalar, Nuclear Theory, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, 24.30.Cz, 25.70.Bc, 25.70.Ef, Giant resonance, Excited state, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Inelastic scattering of 50 MeV/nucleon [sup 40]Ca on [sup 40]Ca was measured in coincidence with protons in order to investigate the excitation and decay of highly excited states in [sup 40]Ca. The proton decay pattern corresponding to an excitation region around 34 MeV shows the characteristic behavior expected of the direct decay of a two-phonon state. Thus, by using this novel method, the presence of a double-phonon state built with isoscalar giant resonances in [sup 40]Ca is demonstrated.

Published
1993
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15. Excitation of giant resonances in heavy-ion reactions at intermediate energies: Results from the 40Ar + 90Zr and 208Pb experiments at 41 MeVu

Author

N. Frascaria, J.C. Roynette, Didier Beaumel, W. Mittig, J. Gastebois, Ph. Chomaz, J. A. Scarpaci, T. Suomijärvi, B. Fernandez, Y. Blumenfeld, J.P. Garron, J. Barrette, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-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 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)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Projectile, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Ion, 0103 physical sciences, Coulomb, Heavy ion, Atomic physics, 010306 general physics, Multipole expansion, Excitation
Abstract

Giant resonances in 90 Zr and 208 Pb have been studied by inelastic scattering of 40 Ar at 41 MeV/u. Strength distributions and exhausted sum-rule values of different multipolarities are presented. The peak-to-background ratios and differential cross sections from inelastic scattering of heavy ions are compared to those obtained with light projectiles. The influence of Coulomb interaction on the excitation of giant resonances and the possibility to study high multipole resonances by intermediate-energy heavy ions are discussed.

Published
1990
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16. Measurement of theB(E2,01+→21+)in theN=16nucleusNe26

Author

Ken Ishikawa, Y. Yanagisawa, Tomoko Gomi, Didier Beaumel, Shuichi Takeuchi, E. Takeshita, Takashi Nakamura, Naoki Fukuda, Kenichi Yoshida, A. Saito, Z. Elekes, Takashi Teranishi, Zs. Dombrádi, Yasuhiro Togano, A. M. Vinodkumar, T. Motobayashi, S. Fortier, Yosuke Kondo, Y. Blumenfeld, H. Baba, V. Lima, N. Frascaria, Y. Satou, Nori Aoi, Takashi Kubo, and J. Gibelin

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Charge (physics), Coulomb excitation, State (functional analysis), Inelastic scattering, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, medicine, Beta (velocity), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Nucleus, Beam (structure)
Abstract

Differential cross section of the inelastic scattering of a 54 MeV/nucleon {sup 26}Ne beam on a lead target has been measured by detecting the deexcitation {gamma}-rays. Analysis of the first 2{sup +} state angular distribution of the inelastically scattered nuclei shows that the process cannot be considered as a pure Coulomb excitation, and nuclear contribution must be taken into account. The charge deformation deduced, {beta}{sub 2}{sup C}=0.392{+-}0.024, corresponds to a B(E2)=141{+-}18 e{sup 2} fm{sup 2} in agreement with a N=16 subshell closure.

Published
2007
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17. N=14Shell Closure inO22Viewed through a Neutron Sensitive Probe

Author

E. Khan, Muriel Fallot, V. Lima, P. Roussel-Chomaz, K. W. Kemper, L. Nalpas, E. C. Pollacco, E. Becheva, Dao T. Khoa, F. Skaza, N. Keeley, Lydie Giot, J. E. Sauvestre, V. Lapoux, Franck Delaunay, J. M. Daugas, C. E. Demonchy, Y. Blumenfeld, Didier Beaumel, Marcella Grasso, O. Roig, A. Drouart, J.A. Scarpaci, A. Gillibert, H. S. Than, and A. Musumarra

Subjects
Physics, Elastic scattering, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, General Physics and Astronomy, Inelastic scattering, 01 natural sciences, 0103 physical sciences, Neutron, Continuum (set theory), Nuclear drip line, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2{sub 1}{sup +} inelastic scattering angular distributions for the neutron-rich nucleus {sup 22}O were measured using the MUr a STrip detector array at the Grand Accelerateur National d'Ions Lourds facility. A deformation parameter {beta}{sub p,p{sup '}}=0.26{+-}0.04 is obtained for the 2{sub 1}{sup +} state, much lower than in {sup 20}O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. The ratio of neutron to proton contributions to the 2{sub 1}{sup +} state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip line.

Published
2006
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18. MUST II: Large solid angle light charged particle telescope for studies with radioactive beams

Author

F. Auger, L. Olivier, J. P. Baronick, A. Boujrad, M. Tripon, L. Leterrier, A. Richard, F. Druillole, E. Wanlin, B. Raine, L. Gregory, E. Atkin, L. Nalpas, L. V. Lapoux, Y. Blumenfeld, Didier Beaumel, E. C. Pollacco, P. Edelbruck, P. Roussel‐Chomaz, A. Drouart, P. Baron, C. Houaner, F. Hammache, L. Lavergne, F. Saillant, M. Rouger, A. Gillibert, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), S.V. Harissopulos, P. Demetriou, E. Julin, MUST2, 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
010302 applied physics, Physics, Radioactive ion beams, Inverse kinematics, Solid angle, telescopes, 29.40.Wk, solid-state nuclear track detectors, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Charged particle, law.invention, Nuclear physics, Telescope, law, 0103 physical sciences, Physics::Accelerator Physics, 010306 general physics, Particle beam, Charged particle beam, Nuclear Experiment, radioactive ion beams, Beam (structure), Astrophysics::Galaxy Astrophysics
Abstract

International audience; A large area telescope for measurements with radioactive beams in inverse kinematics for transfer reactions or unbound final states is described. The performance and the first beam tests results are described.

Published
2005
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19. 2H(18F,pα)15Nreaction applied to nova γ-ray emission

Author

Marlete Assunção, N. A. Smirnova, Marc Loiselet, F. de Oliveira Santos, P. Figuera, N. de Sereville, Alain Ninane, J. Kiener, Guido Ryckewaert, Manoel Couder, B. Bouzid, A. Coc, Michel Gaelens, A. Lefebvre, Pierre Leleux, C. Angulo, J. P. Thibaud, P. Demaret, S. Ouichaoui, Daniel Labar, S. Fortier, S. Cherubini, Vincent Tatischeff, F. Hammache, and Didier Beaumel

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Astrophysics, Nova (laser), 010306 general physics, 01 natural sciences
Published
2003
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20. One-nucleon transfer reactions to continuum states induced by heavy ion projectiles

Author

Sydney Gales, J.P. Garron, S. Fortier, J. A. Scarpaci, J.C. Roynette, I. Lhenry, Y. Blumenfeld, J. Barreto, G.H. Yoo, H. Laurent, G. M. Crawley, N. Frascaria, Didier Beaumel, A. Gillibert, Ph. Chomaz, T. Suomijärvi, Joseph E. Finck, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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), 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), and Blanchet, Marie-Christine

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Q value, Semiclassical physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Giant resonance, 0103 physical sciences, Quasiparticle, Neutron, Atomic physics, 010306 general physics, Nucleon, Excitation
Abstract

High-lying excitations were studied by means of the {sup 207}Pb{r_arrow}{sup 208}Pb, {sup 209}Bi{r_arrow}{sup 210}Bi, and {sup 59}Co{r_arrow}{sup 60}Ni stripping reactions and {sup 209}Bi{r_arrow}{sup 208}Pb and {sup 63}Cu{r_arrow}{sup 62}Ni pickup reactions induced by {sup 20}Ne and {sup 36}Ar projectiles at 48 and 42 MeV/nucleon, respectively. In the stripping spectra, structures a few MeV wide are observed at excitation energies of 10{endash}15 MeV, embedded in a large continuum. The corresponding {ital Q} values suggest that these structures are predominantly due to single-particle excitations rather than to the excitation of collective states such as giant resonances. This interpretation is in agreement with a microscopic calculation showing that in the one-nucleon transfer reactions only a small part of the cross section is due to the collective excitations. The overall shape of the neutron stripping spectra is well reproduced by the semiclassical reaction model of Bonaccorso and Brink, which treats on the same footing both the breakup of the projectile and the transfer to single-particle resonances. {copyright} {ital 1996 The American Physical Society.}

Published
1996

21. [Untitled]

Author

J. C. Thomas, Ch Finck, B. Fernandez, J. A. Scarpaci, F. Flavigny, F. Nowacki, Kamila Sieja, O. Sorlin, I. Stefan, J Burgunder, L. Caceres, E Pllumbi, S. Franchoo, A. Goasduff, Jérôme Guillot, D. Curien, C Stoedel, S. Giron, N. de Sereville, F. Haas, M Moukaddam, A. Obertelli, F. Hammache, J Piot, G. Duchêne, L. Nalpas, M.N. Harakeh, Riccardo Raabe, Emyr Clement, S. Grévy, Julien Gibelin, F. Didierjean, K. W. Kemper, A. Matta, Lapoux, Y Matea, L. Perrot, J. Pancin, A. Gillibert, and Didier Beaumel

Subjects
Physics, Light nucleus, Valence (chemistry), Stripping (chemistry), 010308 nuclear & particles physics, Island of inversion, Nuclear Theory, General Physics and Astronomy, Space (mathematics), 7. Clean energy, 01 natural sciences, Nuclear physics, Position (vector), 0103 physical sciences, Quadrupole, Neutron, Nuclear Experiment, 010306 general physics
Abstract

It has been shown that the neutron 2d5=2 orbital has to be included in shell-model calculations to explain the large quadrupole collectivity observed in the Fe and Cr of N = 40 region, probably a new island of inversion similar to the one known for light nuclei around N = 20. Indeed, in these calculations using a large valence neutron space, the position, i.e. the singleparticle energy, of the 2d5=2 orbital is a crucial ingredient. The experiment discussed in this paper aims to determine the $\nu$1g9=2–$\nu$2d5=2 gap using the neutron stripping reaction d(68Ni; p)68Ni which has been performed at GANIL in inverse kinematics. Preliminary results are presented.

Published
2011
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22. Anharmonicity in extended RPA

Author

Didier Beaumel, Ph. Chomaz, Institut de Physique Nucléaire d'Orsay (IPNO), 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
Physics, Dipole, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Quantum mechanics, Nuclear Theory, 0103 physical sciences, Quadrupole, Anharmonicity, General Physics and Astronomy, Schematic model, 010306 general physics, 01 natural sciences
Abstract

We present an anlytical formula for the calculation of the anharmonicity of the two-phonon states which is based on a variational derivation of RPA-like equations for a many-fermion system. Analytical estimations of the anharmonicity have been made using the Lipkin model and a degenerated schematic model. The formula obtained, together with the extended RPA predictions, has been checked by comparison with the exact solutions of the models. A rough estimate of the anharmonicity of the two-phonon state built on the Giant Dipole Resonance and on the Giant Quadrupole Resonance has been deduced.

Published
1992

23. Excitation of giant resonances in 20Ne + 90Zr and 208Pb inelastic scattering at 40 MeV/u

Author

B. Fernandez, N. Frascaria, B. Berthier, J. Gastebois, J.C. Jacmart, W. Mittig, T. Suomijärvi, I. Linck, L. Kraus, J.C. Roynette, J. Barrette, P. Roussel-Chomaz, J.P. Garron, Didier Beaumel, Ph. Chomaz, Y. Blumenfeld, 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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), 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)-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 Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Spectral line, Cross section (physics), Giant resonance, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Excitation
Abstract

Spectromètre SPEG; The giant resonance region in the inelastic spectra from the reactions 20Ne + 90Zr and 20Ne + 208Pb at 40 MeV/nucleon has been studied with good energy and angular resolutions. The strength distributions of the different multipolarities contributing to the cross section were obtained without making any hypothesis on the excitation energies and shapes of the resonances. In the case of 208Pb the GDR strength was found to be strongly shifted towards lower excitation energies which can be explained by the exponentially decreasing Coulomb excitation probability. Furthermore, indications for a high multipolarity component in the resonance structure were found in both reactions.

Published
1989
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24. Forward angle measurements of 60 MeV/nucleonAr40peripheral interactions onPb208

Author

T. Suomijärvi, Y. Blumenfeld, B. Berthier, Didier Beaumel, J.C. Roynette, J. Barrette, N. Frascaria, Ph. Chomaz, J. Gastebois, J.C. Jacmart, B. Fernandez, J.P. Garron, and W. Mittig

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Spectral line, Nuclear physics, Forward angle, Fragmentation (mass spectrometry), Electric field, 0103 physical sciences, Coulomb, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

Velocity and angular distributions of projectile-like fragments were measured between theta/sub lab/ = 0/sup 0/ and 4/sup 0/ (inside the grazing angle) for the /sup 40/Ar+ /sup 208/Pb system at 60 MeV/nucleon using a magnetic spectrometer. Velocity spectra are similar to those obtained at larger angles, while the angular distributions, very forward peaked for light nuclei, tend to become flat for the heaviest fragments. The influence of the Coulomb and nuclear deflection of the fragments is discussed.

Published
1987
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