スタジオグーダ!(Studio Gooda!)

アクセスカウンタ

zoom RSS 22 Neutrino

<<   作成日時 : 2017/05/16 10:57   >>

ブログ気持玉 0 / トラックバック 0 / コメント 0

22 Neutrino【What is the Universe?】Dialogue with the Universe[1]

○A neutrino is an electrically neutral elementary particle with tiny mass. The neutrino (meaning "little neutral one" in Italian) is denoted by the Greek letter ν (nu). Neutrinos typically pass through normal matter unimpeded and undetected.

○Number of particles
・Comparing the number of particles in the universe, photons and neutrinos are overwhelmingly large.
Photons and neutrinos  10e+3 (300) particles/cm3
 Protons and electrons 10e-6
Neutron 10e-7
Dark matter 10e-8

○ Neutrinos always have left-handed helicities (spins antiparallel to momenta) and all antineutrinos have right-handed helicities.
※Antineutrinos are very heavy. Particles with this much weight can not exist without going back to just after the universe began.
○Because antineutrinos and neutrinos are neutral particles, it is possible that they are actually the same particle.

○ By the way, neutrino is lighter than other nine fermions (particles that make up the substance).

Neutrino        1e-3〜1e-1 (eV)
other nine fermions  1e+6〜1e+12 (eV)
Higgs boson 1e+11 (126GeV)

○Immediately after the universe was born, Higgs bosons are flying around too much heat. Then, symmetry is maintained, weak force and the electromagnetic force behave in the same way. In such cases, quarks and neutrinos can change places with each other.

○Neutralino that is the lightest and stable particle in supersymmetric particles is one of the leading candidates for dark matter.
・Neutralino, that is the partner of photon and Z boson or the the Higgs particle, and that is electrically neutral. It's spin is 1/2. So neutralino particles is such as relatives of neutrino.

【References】
1.Wikipedia:Neutrino

テーマ

注目テーマ 一覧


月別リンク

ブログ気持玉

クリックして気持ちを伝えよう!
ログインしてクリックすれば、自分のブログへのリンクが付きます。
→ログインへ

トラックバック(0件)

タイトル (本文) ブログ名/日時

トラックバック用URL help


自分のブログにトラックバック記事作成(会員用) help

タイトル
本 文

コメント(0件)

内 容 ニックネーム/日時

コメントする help

ニックネーム
本 文
22 Neutrino スタジオグーダ!(Studio Gooda!)/BIGLOBEウェブリブログ
文字サイズ:       閉じる