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Journal Articles

Simulation study of heavy ion acceleration in J-PARC

Harada, Hiroyuki; Saha, P. K.; Kinsho, Michikazu

JPS Conference Proceedings (Internet), 33, p.011028_1 - 011028_6, 2021/03

https://doi.org/10.7566/JPSCP.33.011028

Recently, humankind had big discovery about neutron star, which is great big nuclear in the space. They are discovery of neutron star with twice mass of solar in 2010 and detection of gravity wave when two neutron stars incorporate in 2017. In order to understand the high dense matter like the neutron star, project of experimental researches by using accelerated heavy ion beams are planed in the world. The J-PARC facility consists of three accelerators, which are 400 MeV linac, 3 GeV rapid cycling synchrotron and Main Ring synchrotron. The accelerated MW class high intensity proton beams are used in many experiments. We have simulation study of the heavy ion beam in J-PARC to fully utilize high intensity ability of J-PARC. We propose the accelerator scheme of the beam in J-PARC and the intensity will reach to the world record. In my talk, I will introduce the accelerator scheme for the high-intensity heavy ion beam in J-PARC.

Journal Articles

"", a -meson nuclear bound state, observed in He( reactions

Hashimoto, Tadashi; Tanida, Kiyoshi; 67 of others*

Physics Letters B, 789, p.620 - 625, 2019/02

https://doi.org/10.1016/j.physletb.2018.12.058

Times Cited Count：33 Percentile：95.08(Astronomy & Astrophysics)

We observed a distinct peak in the invariant mass spectrum of $^{3}{rm He}(K^-, , Lambda p)n$ , well below , , the mass threshold of the to be bound to two protons. By selecting a relatively large momentum-transfer region MeV/, one can clearly separate the peak from the quasi-free process, followed by the non-resonant absorption by the non-resonant absorption by the two spectator-nucleons . We found that the simplest fit to the observed peak gives us a Breit-Wignerpole position at $B_{rm {it Kpp}} = 47 pm 3 , (stat.) ,^{+3}_{-6},(sys.)$ MeV having a width $Gamma_{rm {it Kpp}} = 115 pm 7 , (stat.),^{+10}_{-20} ,(sys.)$ MeV, and the -wave Gaussian reaction form-factor parameter $Q_{rm {it Kpp}} = 381 pm 14 , (stat.),^{+57}_{-0} ,(sys.)$ MeV/, as a new form of the nuclear bound system with strangeness -"".

Journal Articles

Evidence for p-process nucleosynthesis recorded at the solar system abundances

Hayakawa, Takehito; Iwamoto, Nobuyuki; Shizuma, Toshiyuki; Kajino, Toshitaka*; Umeda, Hideyuki*; Nomoto, Kenichi*

European Physical Journal A, 27(S1), p.123 - 128, 2006/03

https://doi.org/10.1140/epja/i2006-08-017-6

Times Cited Count：0 Percentile：0.01(Physics, Nuclear)

no abstracts in English

Journal Articles

Postbounce evolution of core-collapse supernovae; Long-term effects of the equation of state

Sumiyoshi, Kosuke*; Yamada, Shoichi*; Suzuki, Hideyuki*; Shen, H.*; Chiba, Satoshi; Toki, Hiroshi*

Astrophysical Journal, 629(2, Part1), p.922 - 932, 2005/08

https://doi.org/10.1086/431788

Times Cited Count：228 Percentile：97.41(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

$^{1}S_{0}$ proton superfluidity in neutron star matter; Impact of bulk properties

Tanigawa, Tomonori; Matsuzaki, Masayuki*; Chiba, Satoshi

Physical Review C, 70(6), p.065801_1 - 065801_7, 2004/12

https://doi.org/10.1103/PhysRevC.70.065801

Times Cited Count：9 Percentile：51.36(Physics, Nuclear)

We study the $^{1}S_{0}$ proton pairing gap in neutron star matterputting emphasis on influence of the Dirac effective mass and theproton fraction on the gap within the relativistic Hartree-Bogoliubovmodel. The gap equation is solved using the Bonn-B potential as aparticle-particle channel interaction. It is found that the maximalpairing gap $Delta_mathrm{max}$ is 1-2MeV, which has a strongcorrelation with the Dirac effective mass. Hence we suggest that itserves as a guide to narrow down parameter sets of the relativisticeffective field theory. Furthermore, the more slowly protons increasewith density, the lower the peak of the gap and the wider thesuperfluid range become.

JAEA Reports

Proceedings of the 5th Symposium on Science of Hadrons under Extreme Conditions; March 18-20, 2003, JAERI, Tokai, Japan

Maruyama, Toshiki; Chiba, Satoshi

JAERI-Conf 2003-009, 233 Pages, 2003/08

JAERI-Conf-2003-009.pdf:15.94MB

The fifth symposium on Science of Hadrons under Extreme Conditions, organized by the Research Group for Hadron Science, Advanced Science Research Center, was held at Tokai Research Establishment of JAERI on March 18 to 20, 2003. The symposium was devoted for discussions and presentations of research results in wide variety of hadron physics such as nuclear matter, hypernuclei, neutron stars, supernovae, nucleosynthesis, heavy-ion reactions, quark matter and quantum chromodynamics to understand various aspects of hadrons under extreme conditions. Thirty three papers on these topics presented at the symposium aroused lively discussions among approximately 50 participants. The concluding remark for the "research group for hadron science" and the explanation of next project "research group for manybody theory of hadron systems" was also presented by the group leader Dr. S. Chiba with gratitude to the participants and to all the scientists concerned.

Journal Articles

Possibility of pairing and its dependence on background density in a relativistic Hartree-Bogoliubov model

Tanigawa, Tomonori; Matsuzaki, Masayuki*; Chiba, Satoshi

Physical Review C, 68(1), p.015801_1 - 015801_8, 2003/07

https://doi.org/10.1103/PhysRevC.68.015801

Times Cited Count：16 Percentile：68.45(Physics, Nuclear)

We calculate a pairing gap in binary mixed matter of nucleons and hyperons within the relativistic Hartree-Bogoliubov model since a recent experiment suggests a weaker attraction than before, which has a significant impact on properties of neutron stars in various aspects. Lambda hyperons to be paired up are immersed in background nucleons in normal state. A phenomenological interaction, which is derived relativistically from the Lagrangian of the system, is adopted to the gap equation. It is found that at background density $rho_{N}=2.5rho_{0}$ the pairing gap is very small, and that denser background makes it rapidly suppressed. This result suggests a mechanism, specific to mixed matter dealt with relativistic models, of its dependence on the nucleon density.

JAEA Reports

Proceedings of the 4th Symposium on Science of Hadrons under Extreme Conditions; March 4-6, 2002, JAERI, Tokai, Japan

Chiba, Satoshi; Maruyama, Toshiki

JAERI-Conf 2002-011, 231 Pages, 2002/09

JAERI-Conf-2002-011.pdf:17.42MB

no abstracts in English

Journal Articles

Magnetic shift of magic nuclei

Kondratyev, V. N.

Journal of Nuclear Science and Technology, 39(Suppl.2), p.550 - 553, 2002/08

http://wwwndc.jaea.go.jp/nd2001/proc/pdf/1_0550.pdf

As we have recently proposed study magnetic fields can modify dramatically the nuclear structure leading, e.g., to a change of shell-correction components of binding energies and nuclear magic numbers. In this contribution we further demonstrate that the predominant mechanism of such a modification can be interpreted as a phase-shift in shell-oscillations originating from a field dependent interference of contributions coming from majority- and minority-spin energy levels. Nuclear magic numbers corresponding to the vicinity of the stability line depend on the magnetic field and are changed considerably at the strength scale $Bsim 10^{16} - 10^{17}$ G relevant, e.g., for supernovas and neutron stars. At such a field strength the magic nuclei of the iron region are shifted towards smaller mass numbers.

JAEA Reports

Nuclear reactions in ultra-magnetized supernovae

Kondratyev, V. N.

JAERI-Research 2002-010, 32 Pages, 2002/06

JAERI-Research-2002-010.pdf:2.09MB

no abstracts in English

Journal Articles

Structure of nuclei in strong magnetic fields

Kondratyev, V. N.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.205 - 208, 2002/06

https://doi.org/10.14494/jnrs2000.3.205

Magnetic field effect on nuclear structure is investigated. The modification of magic numbers, angular and magnetic moments is analysed.

Journal Articles

Statistics of magnetic noise in neutron star crusts

Kondratyev, V. N.

Physical Review Letters, 88(22), p.221101_1 - 221101_4, 2002/06

https://doi.org/10.1103/PhysRevLett.88.221101

Times Cited Count：42 Percentile：81.95(Physics, Multidisciplinary)

The neutron star crust magnetodynamics is demonstrated to exhibit erraticjumps at the fields corresponding to the sharp change of nuclide magneticmoments induced by quantization effects. Such a noise originates frommagnetic avalanches and shows intensity and statistical properties which arefavorably compared to the burst activity of soft repeaters.

JAEA Reports

Magnetization of neutron star matter and implications in physics of soft repeaters

Kondratyev, V. N.

JAERI-Research 2001-057, 74 Pages, 2002/01

JAERI-Research-2001-057.pdf:7.23MB

The magnetization of neutron star matter is considered within the thermodynamic formalism. The quantization effects are demonstrated to result in sharp abrupt magnetic field dependence of nuclide magnetic moments. Accounting for inter-nuclide magnetic coupling we show that such anomalies give rise to erratic jumps in magnetotransport of neutron star crusts. The properties of such a noise are favorably compared with burst statistics of Soft Repeaters.

Journal Articles