New measurements of the p̄p annihilation cross section at very low energy
New measurements of the p̄p annihilation cross section at very low energy
复制标题
极低能量下 p̄p 湮没截面的新测量
DOI：
10.1016/s0370-2693(99)00827-8
复制
发表时间：
1999
影响因子：
4.4
通讯作者：
S. Tessaro
中科院分区：
文献类型：
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作者：
A. Zenoni;A. Bianconi;F. Bocci;G. Bonomi;M. Corradini;A. Donzella;E. Rizzini;L. Venturelli;A. Bertin;M. Bruschi;M. Capponi;S. Castro;R. Donà;D. Galli;B. Giacobbe;U. Marconi;I. Massa;M. Piccinini;N. Cesari;R. Spighi;V. Vagnoni;S. Vecchi;M. Villa;A. Vitale;A. Zoccoli;C. Cicalò;A. Masoni;S. Mauro;G. Puddu;S. Serci;G. Usai;O. Gorchakov;S. Prakhov;A. Rozhdestvensky;V. Tretyak;M. Poli;P. Gianotti;C. Guaraldo;A. Lanaro;V. Lucherini;C. Petrascu;V. Ableev;U. Gastaldi;L. Vannucci;G. Bendiscioli;A. Fontana;P. Montagna;A. Rotondi;P. Salvini;N. Mirfakhrai;F. Balestra;E. Botta;T. Bressani;M. Bussa;L. Busso;D. Calvo;P. Cerello;S. Costa;O. Denisov;F. D’isep;A. Feliciello;L. Ferrero;A. Filippi;R. Garfagnini;A. Grasso;A. Maggiora;S. Marcello;A. Panzarasa;F. Tosello;M. Agnello;F. Iazzi;B. Minetti;S. Tessaro
使用 LEAR 的 Obelix 装置，在 70 MeV/c 和 38 MeV/c 之间的四个 p ̄ 入射动量值处测量了 p p 全湮灭截面。新的测量结果与之前由 Obelix 实验进行的低能 p p 全湮灭截面的测量趋势一致。贝尔廷等人，物理学。莱特。 B 369（1996）77； A. Benedettini 等人，Nucl。物理。 B (Proc. Suppl.) 56A (1997) 58]，以及基于散射幅度的低能量扩展对后者数据的拟合[J。卡博内尔，K.V.普罗塔索夫，A.泽诺尼，物理学。莱特。 B 397（1997）345]。湮没截面偏离平滑行为，由先前对 44 MeV/c 左右截面的测量表明 [A.贝尔廷等人，物理学。莱特。 B 369(1996)77]，未得到新数据证实。
The p p total annihilation cross section has been measured at four values of the p ̄ incident momentum, between 70 MeV/c and 38 MeV/c, with the Obelix apparatus at LEAR. The new measurements are in agreement with the trend of previous measurements of the p p total annihilation cross section at low energy, performed by the Obelix experiment [A. Bertin et al., Phys. Lett. B 369 (1996) 77; A. Benedettini et al., Nucl. Phys. B (Proc. Suppl.) 56A (1997) 58], as well as with a fit of the latter data based on a low energy expansion of the scattering amplitude [J. Carbonell, K.V. Protasov, A. Zenoni, Phys. Lett. B 397 (1997) 345]. The departure of the annihilation cross section from a smooth behaviour, suggested by a previous measurement of the cross section around 44 MeV/c [A. Bertin et al., Phys. Lett. B 369 (1996) 77], is not confirmed by the new data.