翻訳と辞書 Words near each other ・ Ropeley, Queensland ・ Roper ・ Roper (band) ・ Roper (Dungeons & Dragons) ・ Roper (surname) ・ Roper Bar, Northern Territory ・ Roper Center for Public Opinion Research ・ Roper Gulf Region ・ Roper Highway ・ Roper Hotel ・ Roper House Complex ・ Roper Lake State Park ・ Roper Lethbridge ・ Roper Mountain Science Center ・ Roper Point ・ Roper resonance ・ Roper River ・ Roper River scrub robin ・ Roper Road ・ Roper steam velocipede ・ Roper Stote Donnison Roper ・ Roper Technologies ・ Roper v. Simmons ・ Roper's Knob Fortifications ・ Roper, Kansas ・ Roper, North Carolina ・ Roper-Corbet ・ Roperi ・ Roperia ・ Roperia poulsoni Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Roper resonance ： ウィキペディア英語版 Roper resonance The Roper resonance, also known as P11(1440) or N(1440)1/2+, is an unstable baryon state/particle with a mass of about 1,440 MeV/c2 and with a relatively wide full Breit-Wigner width Γ≈300 MeV/c2. It contains three quarks (up (u) or down (d)) with total spin J=1/2 and total isospin I=1/2. In the quark model it is considered to be a radially excited three-quark state with radial quantum number N=2 and positive parity. The Roper Resonance has been a subject of many studies because its mass is actually lower than three-quark states with radial quantum number N=1. Only in the late 2000s was the lower-than-expected mass explained by theoretical calculations, revealing a quark core shielded by a dense cloud of pions and other mesons. ==Discovery== The Roper resonance was discovered in 1963 by a computer fit of particle-scattering theory to large amounts of pion-nucleon scattering data. The analysis was done on computers at Lawrence Livermore National Laboratory for Ph.D. thesis work of (L. David Roper ) at Massachusetts Institute of Technology under the direction of (Prof. Bernard Taub Feld ) at MIT and (Dr. Michael J. Moravcsik ) at LLNL. The computer code was developed by (Richard Allen Arndt ) and Robert M. Wright. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Roper resonance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.