论文标题
$π^ - $生产的$^7 $ be+$^9 $的测量值是在Beam Momenta的碰撞,从19 $ a $ a $至150 $ a $ gev/$ gev/$ c $/$ c $/na61/shine shine实验
Measurements of $π^-$ production in $^7$Be+$^9$Be collisions at beam momenta from 19$A$ to 150$A$GeV/$c$ in the NA61/SHINE experiment at the CERN SPS
论文作者
论文摘要
CERN超级质子同步器(SP)的Na61/Shine协作研究通过测量粒子碰撞的粒子产生在核心的碰撞中,在覆盖SPS能量范围的一组能量的碰撞中,通过测量粒子产生的粒子产生来发作。 This paper presents results on inclusive double-differential spectra and mean multiplicities of $π^{-}$ mesons produced in the 5\% most \textit{central} $^7$Be+$^9$Be collisions at beam momenta of 19$A$, 30$A$, 40$A$, 75$A$ and 150$A$ GeV/$c$ obtained by the so-called $h^-$ method which does不需要任何粒子识别。 横向质谱的形状不同于中央PB+PB碰撞和非弹性P+P相互作用的形状。速度分布的归一化宽度随着碰撞能量的增加而降低,并且在无弹性核定核子和中央PB+PB碰撞的结果之间存在。 \ textit {central} $^7 $ be+$^9 $ collisisions中,每个受伤的核子的平均多重性接近中央PB+PB碰撞碰撞,最高75美元$ a $ gev/$ c $。但是,在最高的SPS能量上,结果接近无弹性核子核子相互作用的结果。 结果将在Cern SPS碰撞能量下脱糊化的预测背景下进行讨论。
The NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) the onset of deconfinement in hadronic matter by the measurement of particle production in collisions of nuclei with various sizes at a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra and mean multiplicities of $π^{-}$ mesons produced in the 5\% most \textit{central} $^7$Be+$^9$Be collisions at beam momenta of 19$A$, 30$A$, 40$A$, 75$A$ and 150$A$ GeV/$c$ obtained by the so-called $h^-$ method which does not require any particle identification. The shape of the transverse mass spectra differs from the shapes measured in central Pb+Pb collisions and inelastic p+p interactions. The normalized width of the rapidity distribution decreases with increasing collision energy and is in between the results for inelastic nucleon-nucleon and central Pb+Pb collisions. The mean multiplicity of pions per wounded nucleon in \textit{central} $^7$Be+$^9$Be collisions is close to that in central Pb+Pb collisions up to 75$A$GeV/$c$. However, at the top SPS energy the result is close to the one for inelastic nucleon-nucleon interactions. The results are discussed in the context of predictions for the onset of deconfinement at the CERN SPS collision energies.