Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Nishimura, Nobuya"'
Autor:
Dohi, Akira, Nishimura, Nobuya, Hirai, Ryosuke, Takeda, Tomoshi, Iwatari, Wataru, Tamagawa, Toru, Aoyama, Amira, Enoto, Teruaki, Iwata, Satoko, Kato, Yo, Kitaguchi, Takao, Mhira, Tatehiro, Ota, Naoyuki, Takahashi, Takuya, Watanabe, Sota, Yamasaki, Kaede
In February and March 2024, several Type I X-ray bursts from the accreting neutron star SRGA J144459.2$-$60420 were detected by multiple X-ray satellites, with the first reports coming from INTEGRAL and NinjaSat. These observations reveal that after
Externí odkaz:
http://arxiv.org/abs/2411.10993
Autor:
Takeda, Tomoshi, Tamagawa, Toru, Enoto, Teruaki, Kitaguchi, Takao, Kato, Yo, Mihara, Tatehiro, Iwakiri, Wataru, Numazawa, Masaki, Ota, Naoyuki, Watanabe, Sota, Jujo, Arata, Aoyama, Amira, Iwata, Satoko, Takahashi, Takuya, Yamasaki, Kaede, Hu, Chin-Ping, Takahashi, Hiromitsu, Dohi, Akira, Nishimura, Nobuya, Hirai, Ryosuke, Yoshida, Yuto, Sato, Hiroki, Hayashi, Syoki, Zhou, Yuanhui, Uchiyama, Keisuke, Odaka, Hirokazu, Tamba, Tsubasa, Taniguchi, Kentaro
The CubeSat X-ray observatory NinjaSat was launched on 2023 November 11 and has provided opportunities for agile and flexible monitoring of bright X-ray sources. On 2024 February 23, the NinjaSat team started long-term observation of the new X-ray so
Externí odkaz:
http://arxiv.org/abs/2411.10992
Autor:
Dohi, Akira, Iwakiri, Wataru, Nishimura, Nobuya, Noda, Tsuneo, Nagataki, Shigehiro, Hashimoto, Masa-aki
Type-I X-ray bursts are rapid-brightening transient phenomena on the surfaces of accreting neutron stars (NSs). Some X-ray bursts, called {\it clocked bursters}, exhibit regular behavior with similar light curve profiles in their burst sequences. The
Externí odkaz:
http://arxiv.org/abs/2311.02853
Publikováno v:
Phys. Rev. C 108, 054607 (2023)
Background: Precise understanding of nuclear fission is crucial for experimental and theoretical nuclear physics, astrophysics, and industrial applications; however, the complete physical mechanics is unresolved due to the complexities. Purpose: In t
Externí odkaz:
http://arxiv.org/abs/2307.08971
Autor:
Zhen, Guoqing, Lv, Guoliang, Liu, Helei, Dohi, Akira, Nishimura, Nobuya, Zhu, Chunhua, Song, Liyu, Wang, Weiyang, Xu, Renxin
Type I X-ray bursts are rapidly brightening phenomena triggered by thermonuclear burning on accreting layer of a neutron star (NS). The light curves represent the physical properties of NSs and the nuclear reactions on the proton-rich nuclei. The num
Externí odkaz:
http://arxiv.org/abs/2304.07197
Autor:
Dohi, Akira, Nishimura, Nobuya, Sotani, Hajime, Noda, Tsuneo, Liu, Helei, Nagataki, Shigehiro, Hashimoto, Masa-aki
Publikováno v:
ApJ 937 124 (2022)
We investigate the impacts of neutrino cooling mechanism inside the neutron star (NS) core on the light curves of type-I X-ray bursts and X-ray superbursts. From several observations of NS thermal evolution, physical processes of fast neutrino coolin
Externí odkaz:
http://arxiv.org/abs/2208.14622
Publikováno v:
Prog Theor Exp Phys (2022)
The determination of the equation of state (EOS) for nuclear matter has been one of the biggest problems in nuclear astrophysics, because the EOS is essential for determining the properties of neutron stars. To constrain the density-dependence of the
Externí odkaz:
http://arxiv.org/abs/2203.05410
Autor:
Okubayashi, Mizuki, Tanaka, Shoya, Aritomo, Yoshihiro, Ishizaki, Shoma, Amano, Shota, Nishimura, Nobuya
The nuclear fission of very neuron-rich nuclei related to the r-process is essential for the termination of nucleosynthesis flows on the nuclear chart and the final abundances. Nevertheless, most of the available fission data for the r-process calcul
Externí odkaz:
http://arxiv.org/abs/2105.09272
A large star-to-star variation in the abundances of r-process elements, as seen in the [Eu/Fe] ratio for Galactic halo stars, is a prominent feature that is distinguishable from other heavy elements. It is, in part, caused by the presence of highly r
Externí odkaz:
http://arxiv.org/abs/1912.11065
Autor:
Tsujimoto, Takuji, Nishimura, Nobuya
The site of Zn production remains an elusive and challenging problem in astrophysics. A large enhancement of the [Zn/Fe] ratios of very metal-poor stars in the Galactic halo suggests the death of short-lived massive stars, i.e., core-collapse superno
Externí odkaz:
http://arxiv.org/abs/1808.02524