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1. Non-strange dibaryons studied in the γd → π0π0d reaction

Author

T. Ishikawa, H. Fujimura, H. Fukasawa, R. Hashimoto, Q. He, Y. Honda, T. Iwata, S. Kaida, H. Kanda, J. Kasagi, A. Kawano, S. Kuwasaki, K. Maeda, S. Masumoto, M. Miyabe, F. Miyahara, K. Mochizuki, N. Muramatsu, A. Nakamura, K. Nawa, S. Ogushi, Y. Okada, K. Okamura, Y. Onodera, K. Ozawa, Y. Sakamoto, M. Sato, H. Shimizu, H. Sugai, K. Suzuki, Y. Tajima, S. Takahashi, Y. Taniguchi, Y. Tsuchikawa, H. Yamazaki, R. Yamazaki, and H.Y. Yoshida

Subjects
Physics, QC1-999
Abstract

Coherent double neutral-pion photoproduction on the deuteron, γd→π0π0d, has been experimentally studied at incident photon energies ranging from 0.75 to 1.15 GeV. The total cross section as a function of the γd center-of-mass energy shows resonance-like behavior, which peaks at approximately 2.47 and 2.63 GeV. The measured angular distribution of deuteron emission is rather flat, which cannot be reproduced by the kinematics of quasi-free π0π0 production with deuteron coalescence. In π0d invariant-mass distributions, a clear peak is observed at 2.14±0.01 GeV/c2 with a width of 0.09±0.01 GeV/c2. The spin-parity of this state is restricted to 1+, 2+ or 3− from the angular distributions of the two π0s. The present work shows strong evidence for the existence of an isovector dibaryon resonance with a mass of 2.14 GeV/c2. The 2+ assignment is consistent with the theoretically predicted D12 state, and also with the energy dependence of the πd partial-wave amplitude P23 for the π±d→π±d and π+d→pp reactions. Keywords: Coherent meson photoproduction, Dibaryon resonance

Published
2019
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2. First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

Author

T. Ishikawa, H. Fujimura, H. Fukasawa, R. Hashimoto, Q. He, Y. Honda, T. Iwata, S. Kaida, H. Kanda, J. Kasagi, A. Kawano, S. Kuwasaki, K. Maeda, S. Masumoto, M. Miyabe, F. Miyahara, K. Mochizuki, N. Muramatsu, A. Nakamura, K. Nawa, S. Ogushi, Y. Okada, K. Okamura, Y. Onodera, K. Ozawa, Y. Sakamoto, M. Sato, H. Shimizu, H. Sugai, K. Suzuki, Y. Tajima, Y. Taniguchi, Y. Tsuchikawa, H. Yamazaki, R. Yamazaki, and H.Y. Yoshida

Subjects
Coherent meson photoproduction, Dibaryon resonance, ABC effect, Physics, QC1-999
Abstract

The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV for the first time. No clear resonance-like behavior is observed in the excitation function for Wγd=2.38–2.61 GeV, where the d⁎(2380) dibaryon resonance observed at COSY is expected to appear. The measured excitation function is consistent with the existing theoretical calculation for this reaction. The upper limit of the total cross section is found to be 0.034 μb for the dibaryon resonance at Wγd=2.37 GeV (90% confidence level) in the γd→π0π0d reaction.

Published
2017
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3. Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV

Author

T. Ishikawa, A. Fix, H. Fujimura, H. Fukasawa, R. Hashimoto, Q. He, Y. Honda, T. Iwata, S. Kaida, J. Kasagi, A. Kawano, S. Kuwasaki, K. Maeda, S. Masumoto, M. Miyabe, F. Miyahara, K. Mochizuki, N. Muramatsu, A. Nakamura, K. Nawa, Y. Obara, S. Ogushi, Y. Okada, K. Okamura, Y. Onodera, K. Ozawa, Y. Sakamoto, M. Sato, H. Shimizu, H. Sugai, K. Suzuki, Y. Tajima, S. Takahashi, Y. Taniguchi, Y. Tsuchikawa, H. Yamazaki, R. Yamazaki, and H. Y. Yoshida

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

Coherent photoproduction of the neutral pion and eta meson on the deuteron, $\gamma{d}${$\to$}$\pi^0\eta{d}$, has been experimentally studied at incident photon energies ranging from the reaction threshold to 1.15 GeV. The total cross section demonstrates a rapid rise below 1 GeV. The data are underestimated by the existing theoretical calculations based on quasi-free $\pi^0 \eta$ photoproduction on the nucleon followed by deuteron coalescence. At the same time, the data are rather well reproduced by the calculations taking into account the final-state interaction. We have also measured for the first time the differential cross sections: the $\pi^0 \eta$ invariant-mass distribution $d\sigma/dM_{\pi \eta}$, the $\pi^0 d$ invariant-mass distribution $d\sigma/dM_{\pi d}$, the $\eta d$ invariant-mass distribution $d\sigma/dM_{\eta d}$, and the distribution over the deuteron emission angle $d\sigma/d\Omega_d$ in the overall center-of-mass frame. The measured cross section $d\sigma/d\Omega_d$ does not exhibit strongly backward-peaking behavior predicted by the calculations. At all incident energies, an increase in $d\sigma/dM_{\eta d}$ near the $\eta d$ threshold is observed, which indicates a bound or virtual $\eta d$ state resulting from a strong attraction between $\eta$ and a deuteron. The possibilities of using coherent $\pi^0\eta$ photoproduction on a nucleus to study the $\eta$-nuclear interaction are also discussed., Comment: 15 pages, 9 figures

Published
2022

5. Components of collective flow and azimuthal distributions in $^{40}$Ar + $^{27}$Al and $^{40}$Ar + $^{58}$Ni collisions below 85 MeV/u

Author

A. Péghaire, R. Brou, Elio Rosato, J. Kasagi, S.C. Jeong, M. Louvel, G.M. Jin, Y. Cassagnou, Jean Péter, R. Legrain, S.M. Lee, Yasuo Nagashima, T. Motobayashi, H. Doubre, D. Cussol, W.Q. Shen, K. Hagel, T. Nakagawa, Edilson Crema, B. Tamain, J.C. Steckmeyer, J.P. Patry, R. Regimbart, M. Ogihara, F. Saint-Laurent, J.P. Sullivan, G. Bizard, C. Lebrun, R. MacGrath, 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Normandie Université (NU)-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), 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, Range (particle radiation), 010308 nuclear & particles physics, Plane (geometry), Nuclear Theory, Monte Carlo method, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, 7. Clean energy, Azimuth, Nuclear physics, Transverse plane, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The transverse and longitudinal components of collective flow have been measured for the nuclear reactions 27Al(40Ar, X), E = 25–85 MeV/nucleon and Ni(40Ar, X), E = 36 and 65 MeV/u with the 4π array Mur+Tonneau. Monte Carlo simulations show that, even for peripheral reactions, the transverse-momentum analysis method gives a better determination of the reaction plane than the method which uses only the projectile-like fragments. The measured in-plane transverse-flow values reach −30 MeV/c at low energies for Z = 2 particles and tends to zero around 85 MeV/u. Flow-angle values are in the range −65° to −35°. The azimuthal distributions of the measured charged products show that there is no squeeze-out of nuclear matter, but the reaction system has a rotation-like behaviour which increases with the impact-parameter value.

Published
1993

6. Charged-particle calorimetry of $^{40}$Ar + $^{27}$Al reactions from 36 to 65 mev/u

Author

J.P. Patry, R. Regimbart, B. Tamain, F. Saint-Laurent, T. Motobayashi, C. Lebrun, D. Cussol, G.M. Jin, Y. Cassagnou, Edilson Crema, E. Rosato, Jean Péter, R. MacGrath, K. Hagel, J.P. Sullivan, A. Péghaire, H. Doubre, S.M. Lee, G. Bizard, Yasuo Nagashima, D. Durand, S.C. Jeong, J. Kasagi, M. Ogihara, M. Louvel, R. Brou, T. Nakagawa, R. Legrain, J.C. Steckmeyer, 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), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Calorimetry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Charged particle, medicine.anatomical_structure, 0103 physical sciences, medicine, Center of mass, Impact parameter, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Nucleus, Excitation
Abstract

Temperatures and excitation energies have been independently determined for hot nuclei formed in the 40Ar + 27Al reaction at energies ranging from 36 to 65 MeV/u. Charged products have been measured in a geometry close to 4π in the center of mass with the multidetectors MUR and TONNEAU. Events were sorted as a function of the impact parameter and the products emitted from equilibrated nuclei were separated from both pre-equilibrium and target-like products. Temperature (slope parameter) and excitation energy values were deduced from the kinetic energies of particles in the frame of the reconstructed equilibrated nucleus. Both have been found to increase with decreasing impact parameter. For the most central collisions impact parameters — less than 2 fm — the temperature was seen to increase with incident energy (slowly above 45 MeV/u) and reach a value of 7 MeV at 65 MeV/u. The excitation energy per nucleon exhibited a similar behaviour. The correlation between excitation energy and temperature was found to remain compatible with the statistical theory.

Published
1993

7. Inversion of collective matter flow in nucleus-nucleus collisions, measured with a 4$\pi$ charged particle array

Author

H. Doubre, R. MacGrath, J.P. Patry, R. Regimbart, W.Q. Shen, B. Tamain, G.M. Jin, Y. Cassagnou, F. Saint-Laurent, K. Hagel, Jean Péter, C. Lebrun, D. Cussol, G. Bizard, A. Péghaire, S.M. Lee, T. Nakagawa, J. Kasagi, Y. Nagashima, M. Ogihara, T. Motobayashi, E. Crema, R. Brou, R. Legrain, J.C. Steckmeyer, J.P. Sullivan, Elio Rosato, M. Louvel, S.C. Jeong, 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), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Inversion (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Charged particle, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Transverse momentum, medicine, Incident energy, Impact parameter, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, ComputingMilieux_MISCELLANEOUS
Abstract

The multidetector array Mur + Tonneau has been used to perform a 4π detection of charged particles and fragments emitted in reactions between 40 Ar, at energies ranging from 25 to 85 MeV/u, and 27 Al or 58 Ni target. The events have been sorted as a function of the impact parameter value. The collective transverse momentum in the reaction plane (sidewards flow parameter) is observed to strongly vary as a function of impact parameter and incident energy. At low energies, it is shown to be negative. It inverts to positive values at beam energies in the range 70–100 MeV/u depending on the impact parameter value and the mass of the system. These data are compared to dynamical calculations based on LVUU and QMD. In this energy range, the calculated flow values are much more sensitive to the nucleon-nucleon cross section in medium and to the equation of state than at relativistic energies; therefore, quantitative information can be obtained.

Published
1991

8. Exclusive study of nucleus-nucleus reactions at intermediate energies : Impact parameter dependence of preequilibrium emission, Collective flow and hot nuclei formation

Author

K. Hagel, R. Regimbart, Edilson Crema, J. Kasagi, A. Péghaire, J.P. Sullivan, G.M. Jin, Y. Cassagnou, Jean Péter, D. Cussol, R. Brou, J.C. Steckmeyer, S.M. Lee, B. Tamain, F. Saint-Laurent, J.P. Patry, T. Nakagawa, R. Legrain, M. Ogihara, Y. Nagashima, R. MacGrath, Tohru Motobayashi, S.C. Jeong, G. Bizard, H. Doubre, Elio Rosato, M. Louvel, C. Lebrun, 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), 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 SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Normandie Université (NU)-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 Mines Nantes (Mines Nantes)-Université de Nantes (UN)-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, Fusion, 010308 nuclear & particles physics, Scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, Charged particle, medicine.anatomical_structure, 0103 physical sciences, medicine, Impact parameter, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Excitation, ComputingMilieux_MISCELLANEOUS
Abstract

Charged particles and fragments emitted in reactions between 40 Ar at energies ranging from 25 to 85 MeV/u and an 27 Al target have been detected in a geometry close to 4π in the center of mass with the 4π array MUR + TONNEAU. A new global variable, the average parallel velocity, has been used to sort the events as a function of the impact parameter value. The multiplicity of particles emitted from the interaction region increases strongly when the impact parameter value decreases, and reaches 7 in head-on reactions. The flow of these particles is attributed to scattering at negative angles. When the energy increases, compression gradually opposes this negative scattering, until the flow falls to zero. This is obtained at a beam energy in the range 70–80 MeV/u for impact parameters below 2 fm and increases with the impact parameter. This study as a function of the impact parameter and the energy should allow information both on the nucleon-nucleon cross section in medium and the EOS of nuclear matter to be obtained. In central reactions, incomplete fusion nuclei are formed at all incident energies. Their excitation energy increases with the incident energy. Above 36 MeV/u no heavy residue is left, the multiplicity of final products increases as well as the emission probability of several heavy fragments.

Published
1990

9. Global variables and impact parameter determination in nucleus-nucleus collisions below 100 MeV/u

Author

A. Péghaire, H. Doubre, T. Motobayashi, D. Cussol, M. Ogihara, Elio Rosato, J. Kasagi, T. Nakagawa, M. Louvel, J.P. Sullivan, R. Brou, S.M. Lee, J.C. Steckmeyer, C. Lebrun, G.M. Jin, Y. Cassagnou, Jean Péter, R. Legrain, G. Bizard, B. Tamain, F. Saint-Laurent, R. MacGrath, J.P. Patry, R. Regimbart, S.G. Jeong, K. Hagel, Edilson Crema, Yasuo Nagashima, 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), 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
Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Projectile, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Global variable, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Perpendicular, medicine, Atomic physics, Impact parameter, Multiplicity (chemistry), 010306 general physics, Nucleus
Abstract

Several global variables are tested for determining the impact parameter in 4π measurements of charged products. For the system Ar + Al from 25 to 85 MeV/u, simulated reactions are used to study the correlation between the real impact parameter value and the experimentally determined one. Even with a perfect detector, the total multiplicity and the mid-rapidity charge give a poor correlation. Filtering through the acceptance of an actual detector (Mur + Tonneau at GANIL) provides a poor correlation with the total charge, and an acceptable one with the total perpendicular momentum. The average (mass weighted) parallel velocity V av gives the best correlation and is less sensitive to the incident energy and to the mechanisms used in the simulation. Measurements extending to very forward angles are needed to accurately sort events by impact parameter. Real data are used to study the variation of other global variables versus V av : they exhibit the expected average trend, with broad fluctuations. The eccentricity and flow angle allow the evolution of central reactions with the incident energy to be followed. The proportion of relative motion transformed into energy perpendicular to the beam direction decreases when the incident energy increases; its absolute value, however, doubles from 25 to 65 MeV/u. In experimental studies where good separation between participant (pre-equilibrium) and spectator (equilibrium) particles is wanted in addition to good impact parameter sorting, the projectile mass should be in the range 1.2–2.5 times the target mass.

Published
1990

10. Disappearance of flow as a function of impact parameter and energy in nucleus-nucleus collisions

Author

T. Motobayashi, G.M. Jin, J.P. Patry, R. Regimbart, M. Louvel, R. Brou, A. Péghaire, R. Legrain, K. Hagel, Edilson Crema, E. Rosato, R. MacGrath, C. Lebrun, D. Cussol, J. Kasagi, Y. Cassagnou, Jean Péter, B. Tamain, F. Saint-Laurent, S.C. Jeong, G. Bizard, T. Nakagawa, H. Doubre, M. Ogihara, J.P. Sullivan, Y. Nagashima, S.M. Lee, J.C. Steckmeyer, 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), 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
Physics, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, Function (mathematics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Flow (mathematics), 0103 physical sciences, medicine, Atomic physics, Impact parameter, Nuclear Experiment, 010306 general physics, Beam energy, Nucleus, Energy (signal processing)
Abstract

The dependence of collective nuclear flow on impact parameter and beam energy from 25 to 85 MeV/u has been measured for Ar+Al with the 4 π array Mur+Tonneau. The flow of the particles emitted from the interaction region falls to zero at a beam energy in the range 70–80 MeV/u for impact parameters below 2 fm. This energy increases with the impact parameter. This study as a function of the impact parameter and the energy should allow information both on the nucleon-nucleon crosss section in medium and the EOS of nuclear matter to be obtained.

Published
1990

11. Strong impact parameter dependence of pre-equilibrium particle emission in nucleus-nucleus reactions at intermediate energies

Author

G. Bizard, M. Louvel, T. Motobayashi, D. Cussol, Edilson Crema, J. Kasagi, B. Tamain, F. Saint-Laurent, R. Brou, Elio Rosato, K. Hagel, Y. Cassagnou, Jean Péter, J.C. Steckmeyer, R. Legrain, J.P. Sullivan, G.M. Jin, M. Ogihara, S.M. Lee, T. Nakagawa, H. Doubre, C. Lebrun, R. MacGrath, S.C. Jeong, A. Péghaire, Yasuo Nagashima, J.P. Patry, R. Regimbart, 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), 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), 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, Nuclear and High Energy Physics, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, lcsh:QC1-999, Charged particle, medicine.anatomical_structure, Particle emission, 0103 physical sciences, medicine, Impact parameter, Atomic physics, Multiplicity (chemistry), 010306 general physics, Nucleus, lcsh:Physics
Abstract

Charged particles and fragments emitted in reactions between 40 Ar at 45 and 65 MeV/u and an 27 Al target have been detected in a geometry close to 4π in the center of mass. A new global variable, the average parallel velocity, has been used to sort the events as a function of the impact parameter value. For particles with Z = 1 and 2, a pre-equilibrium component is present. Its multiplicity increases strongly when the impact parameter value decreases, and reaches 7 in head-on reactions.

Published
1990

12. The screening effect of D-D fusion in Sm in a sub-low energy region (20 keV).

Author

T S Wang, Z Yang, H Yunemura, A Nakagawa, H Y Lv, J Y Chen, S J Liu, and J Kasagi

Subjects
CONTROLLED fusion, NUCLEAR reactions, COLLISIONS (Nuclear physics), CHEMICAL kinetics
Abstract

The fusion reaction may be significantly changed in a solid target due to electron screening on target nuclei while the projectile energy is very low. The electron screening effect of the D(d, p)T reaction in the deuterated metal Sm at low target temperature (T [?] 133.2 K) has been studied in a deuteron energy region from 10 to 20 keV. The thick target yields of protons emitted in the D(d, p)T reaction were measured and compared with those data extrapolated from cross sections and stopping power data at higher energies. It is found that the reaction rates in Sm are enhanced over those of the bare nuclei. The screening potential in Sm under cooled conditions is deduced to be 520 ± 56 eV, which cannot be simply interpreted by the electron screening. The enhanced screening potential might be roughly interpreted with the classical plasma model of Debye, in which the screening potential decreases with increasing temperature while quasi-free metallic electrons are applied. [ABSTRACT FROM AUTHOR]

Published
2007
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13. The Onset of Multifragmentation in the $^{40}$Ar + $^{27}$Al system between 25 and 85 MeV/u

Author

K. Hagel, D. Cussol, H. Doubre, G. M. Jin, A. Péghaire, J. Péter, F. Saint Laurent, G. Bizard, R. Brou, M. Louvel, J. P. Patry, R. Régimbart, J. C. Steckmeyer, B. Tamain, Y. Cassagnou, R. Legrain, C. Lebrun, S. C. Jeong, S. M. Lee, T. Nakagawa, Y. Nagashima, M. Ogihara, J. Kasagi, T. Motobayashi, R. McGrath, ROSATO, ELIO, 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), Guesnon, Sandrine, I.Iori, K., Hagel, D., Cussol, H., Doubre, G. M., Jin, A., Péghaire, J., Péter, F., Saint Laurent, G., Bizard, R., Brou, M., Louvel, J. P., Patry, R., Régimbart, J. C., Steckmeyer, B., Tamain, Y., Cassagnou, R., Legrain, C., Lebrun, Rosato, Elio, S. C., Jeong, S. M., Lee, T., Nakagawa, Y., Nagashima, M., Ogihara, J., Kasagi, T., Motobayashi, and R., Mcgrath

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1989

14. Production of spin-aligned unstable nuclei in projectile fragmentation at intermediate energies

Author

R. Bimbot, J. Kasagi, D. Guillemaud-Mueller, W. D. Schmidt-Ott, Koichiro Asahi, T. Ichihara, D. Bazin, T. Kubo, R. Anne, Y. Gono, M. Ishihara, M. Fukuda, A.C. Mueller, Robert, Suzanne, 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, Nuclear and High Energy Physics, SIMPLE (dark matter experiment), 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Momentum, Yield (chemistry), 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Anisotropy, Projectile fragmentation, Beam (structure)
Abstract

Spin alignment of 14B products in projectile fragmentation reaction induced by 18O beam at E/A = 60 MeV/u has been measured through observation of anisotropy in β-delayed γ ray emission. The alignment A is small in the momentum region corresponding to the peak in the yield, whereas it takes a large negative value for the high-momentum tail. The result is discussed in terms of a simple model of projectile fragmentation. The relevance of the present result to other applications is also mentioned.

Published
1988

15. Suppression of neutron emission after heavy-ion fusion: Is shape relaxation affected by a superdeformed minimum?

Author

T. L. Khoo, W. Kühn, F. Haas, R. V. F. Janssens, J. Kasagi, R. M. Ronningen, P. Chowdhury, Institut de Recherches Subatomiques (IReS), 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), and Heyd, Yvette

Subjects
Nuclear reaction, Physics, Isotope, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Neutron emission, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Spectral line, Nuclear fusion, Neutron, Atomic physics, Multiplicity (chemistry), Nuclear Experiment
Abstract

Neutron spectra as a function of spin and the neutron multiplicity distribution have been measured for the reaction 233-MeV /sup 64/Ni+ /sup 92/Zr. The emission of two neutrons constitutes the strongest decay channel, in contrast to statistical-model calculations which predict the emission of three neutrons to be the strongest by more than one order of magnitude. This is possibly due to trapping in a superdeformed potential well, similar to that giving rise to fission isomers, as the compound nucleus relaxes from the highly distorted initial shape.

Published
1983
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17. Study of collective flow in heavy ion collisions

Author

Bizard, G., Peter, J., Shen, W.Q., Sullivan, J.P., Brou, R., Cussol, D., Louvel, M., Patry, J.P., Régimbart, R., Steckmeyer, J.C., Tamain, B., Crema, E., Doubre, H., Hagel, K., Jin, G.M., Peghaire, A., Saint-Laurent, F., Cassagnou, Y., Legrain, R., Lebrun, C., Rosato, E., Macgrath, R., Jeong, S.C., Lee, S.M., Nagashima, Y., Nakagawa, T., Ogihara, M., Kasagi, J., Motobayashi, T., 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), M.Ohta, B.Remaud, G., Bizard, J., Péter, W. Q., Shen, J. P., Sullivan, D., Cussol, R., Brou, M., Louvel, J. P., Patry, R., Régimbart, J. C., Steckmeyer, B., Tamain, E., Crema, H., Doubre, K., Hagel, G. M., Jin, A., Péghaire, F., Saint Laurent, Y., Cassagnou, R., Legrain, C., Lebrun, Rosato, Elio, R., Mcgrath, S. C., Jeong, S. M., Lee, Y., Nagashima, T., Nakagawa, M., Ogihara, J., Kasagi, T., Motobayashi, and Guesnon, Sandrine

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1991

18. Inversion of collective matter flow in nucleus-nucleus collisions, measured with a 4$\pi$ charged particle array

Author

Peter, J., Sullivan, J.P., Bizard, G., Cussol, D., Brou, R., Louvel, M., Patry, J.P., Régimbart, R., Steckmeyer, J.C., Tamain, B., Crema, E., Doubre, H., Hagel, K., Jin, G.M., Peghaire, A., Saint-Laurent, F., Cassagnou, Y., Legrain, R., Lebrun, C., Rosato, E., Macgrath, R., Jeong, S.C., Lee, S.M., Nagashima, Y., Nakagawa, T., Ogihara, M., Kasagi, J., Motobayashi, T., 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), I.Iori, J., Péter, J. P., Sullivan, D., Cussol, G., Bizard, R., Brou, M., Louvel, J. P., Patry, R., Régimbart, J. C., Steckmeyer, B., Tamain, E., Crema, H., Doubre, K., Hagel, G. M., Jin, A., Péghaire, F., Saint Laurent, Y., Cassagnou, R., Legrain, C., Lebrun, Rosato, Elio, R., Mcgrath, S. C., Jeong, S. M., Lee, Y., Nagashima, T., Nakagawa, M., Ogihara, J., Kasagi, T., Motobayashi, and Guesnon, Sandrine

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1991

19. Radioactive decay speedup at T=5 K: electron-capture decay rate of (7)Be encapsulated in C(60).

Author

Ohtsuki T, Ohno K, Morisato T, Mitsugashira T, Hirose K, Yuki H, and Kasagi J

Abstract

The electron-capture (EC) decay rate of (7)Be in C(60) at the temperature of liquid helium (T=5 K) was measured and compared with the rate in Be metal at T=293 K. We found that the half-life of (7)Be in endohedral C(60) ((7)Be@C(60)) at a temperature close to T=5 K is 52.47+/-0.04 d, a value that is 0.34% faster than that at T=293 K. In this environment, the half-life of (7)Be is nearly 1.5% faster than that inside Be metal at room temperature (T=293 K). We then interpreted our observations in terms of calculations of the electron density at the (7)Be nucleus position inside the C(60); further, we estimate theoretically the temperature dependence (at T=0 K and 293 K) of the electron density at the Be nucleus position in the stable center inside C(60). The theoretical estimates were almost in agreement with the experimental observations.

Published
2007
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20. Enhanced electron-capture decay rate of 7Be encapsulated in C60 cages.

Author

Ohtsuki T, Yuki H, Muto M, Kasagi J, and Ohno K

Abstract

The decay rate of 7Be electron capture was measured in C60 and Be metal with a reference method. The half-life of 7Be endohedral C60 ((7)Be@C(60)) and 7Be in Be metal (Be metal (7Be)) is found to be 52.68+/-0.05 and 53.12+/-0.05 days, respectively. This amounts to a 0.83% difference in electron-capture decay half-life between (7)Be@C(60) and Be metal (7Be). Our result is a reflection of the different electron wave functions for (7)Be@C(60) inside C60 compared to the situation when 7Be is in a Be metal.

Published
2004
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39. Serum cholesterol level in normal people: association of serum cholesterol level with age and relative body weight.

Author

Hayashi R, Kogure S, Sakaibori K, Kurihara S, Kasagi J, and Murata K

Subjects
Aged, Aged, 80 and over, Aging blood, Cholesterol metabolism, Female, Follow-Up Studies, Humans, Infant, Infant, Newborn, Japan, Male, Middle Aged, Reference Values, Aging physiology, Body Weight, Cholesterol blood
Abstract

Serum cholesterol level was studied in normal subjects in Kasakake Village. The serum cholesterol levels increased significantly with age, from the third to the fifth decade in males and from the third to the seventh decade in females. Thereafter, the levels were maintained in males while declined in females. The mean peak values (+/- SD) were 178 +/- 31 mg/100 ml in males and 207 +/- 37 mg/100 ml in females. The presumptive values of the zero-year-old obtained from the regression lines calculated from the plot of serum cholesterol values against age were 129 mg/100 ml and 112 mg/100 ml in males and females respectively. Throughout the age-range examined in females, the serum cholesterol level was well correlated with the relative body weight determined with modified Broca's method. A similar, but less obvious correlation was demonstrated in males. However, there was not comparable change in the relative body weight against the trend of the serum cholesterol level in both sexes. In the babies normally delivered with full term, the mean cholesterol level (+/- SD) in the umbilical cord blood serum was 65 +/- 13 mg/100 ml and it increased to 150 +/- 46 mg/100 ml during one to three months after birth which was very close to the presumptive values obtained from the regression lines in the adults. There also was significant correlation between the cholesterol value and the body weight. It is concluded that in normal people, age and relative body weight are major and independent determinants of serum cholesterol level from the start of their life.

Published
1987
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