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pro vyhledávání: '"Masa-aki Hashimoto"'
We studied thermal evolution of isolated neutron stars (NSs) including the pion condensation core, with an emphasis on the stiffness of equation of state (EOS). Many temperature observations can be explained by the minimal cooling scenario which excl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d44cf0350dc0ca2f4cf78e331932bb2c
http://arxiv.org/abs/2112.13302
http://arxiv.org/abs/2112.13302
We model the quiescent luminosity of accreting neutron stars with several equation of states (EOSs), including the effect of pion condensation and superfluidity. As a consequence of comparison with the observations, we show that the results with Toga
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a1f485dfbe68f5fe073143267a66f26
We study the quiescent luminosities of accreting neutron stars by a new mechanism as neutrino heating for additional deep crustal heating, where the neutrino heating is produced by charged pions decay from the nuclear collisions on the surface of neu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbb32cfb4e301b67ff702ffef98b3cce
Autor:
Akira Dohi, Nobuya Nishimura, Masa-aki Hashimoto, Yasuhide Matsuo, Tsuneo Noda, Shigehiro Nagataki
Publikováno v:
EPJ Web of Conferences. 260:05002
We study the effects of nuclear equation of state (EOS) on Type-I X-ray bursts, focusing on the Clocked burster GS 1826–24. According to the shell-flush model, the surface gravity of the neutron stars (NSs) strengthens burst activities, where the r
Publikováno v:
EPJ Web of Conferences. 260:11024
Neutron stars are high-density objects formed by the gravitational collapse of massive stars, and the whole star can be likened to a giant nucleus. The interior of a neutron star is considered to contain exotic particles and states which do not appea
Autor:
Takehito Hayakawa, Heamin Ko, Myung-ki Cheoun, Motohiko Kusakabe, Toshitaka Kajino, Satoshi Chiba, Ken’ichi Nomoto, Masa-aki Hashimoto, Masaomi Ono, Toshihiko Kawano, Grant J. Mathews
Publikováno v:
EPJ Web of Conferences. 260:02001
The short-lived unstable isotopes with half-lives of 0.1–10 My have been used as nuclear cosmochronometers to evaluate from an astrophysical event such as supernova (SN) explosion or AGB s-process to the solar system formation. We have proposed sho
Publikováno v:
Progress of Theoretical and Experimental Physics. 2020
As some neutron star transients require an additional unknown heat source (referred to as “shallow heating”) to explain their high temperatures at the beginning of quiescence, we investigate the effect of shallow heating as well as compressional
Autor:
Toshihiko Kawano, Heamin Ko, Masa-aki Hashimoto, Motohiko Kusakabe, Takehito Hayakawa, Masaomi Ono, Alexey Tolstov, Satoshi Chiba, Grant J. Mathews, Myung-Ki Cheoun, Ken'ichi Nomoto, Toshitaka Kajino
Publikováno v:
Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15).
We have proposed a short-lived radioisotope 98Tc as the nuclear cosmochronometer to evaluate the time from the last supernova neutirno-process to the solar system formation (SSF). We have calculated the supernova neutirno-process using a SN 1987A mod
Publikováno v:
Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15).
Autor:
Masa-aki Hashimoto, Riou Nakamura
Publikováno v:
Proceedings of the 15th International Symposium on Origin of Matter and Evolution of Galaxies (OMEG15).