Measurement of neutral mesons in + collisions at = 200 GeV and scaling properties of hadron production

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.

Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03

https://doi.org/10.1103/PhysRevD.83.052004

RHIC-PHENIX実験で重心エネルギー200GeVの陽子陽子衝突からの, , と中間子生成の微分断面積を測定した。これらハドロンの横運動量分布のスペクトルの形はたった二つのパラメーター、、のTsallis分布関数でよく記述できる。これらのパラメーターはそれぞれ高い横運動量と低い横運動量の領域のスペクトルを決めている。これらの分布をフィットして得られた積分された不変断面積はこれまで測定されたデータ及び統計モデルの予言と一致している。

Pulsed neutron experiments on FCA V-I

Nakamura, T.*; Nakano, M.*; Hiraoka, T.*

PNC TJ250 71-33T, 28 Pages, 1971/03

PNC-TJ250-71-33T.pdf:0.58MB

Pulsed neutron experiments have been performed on FCA V-1, the physics mockup core for the JOYO. Neutron decay curves have been measured at several different re-activities from the delayed critical down to -6. In all cases, single exponential decays are observed after the constant delayed component being subtracted. Prompt neutron decay constant and the reactivity pindoller unit are determined for each decay curve. Both 's and 'ps show no dependence on detector positions or energy responses in the measured reactivity range (down to -2). and p hold good linear relation down to -6. The prompt neutron decay constant at delayed critical, c is determined as 0.341 0.03110 sec. c calculated by SNKPARAM with JAERI-FAST set is about 13% larger than the experimental value.