PION ABSORPTION AT REST IN HE-4

被引：9
|
作者：
DAUM, E
VINZELBERG, S
GOTTA, D
ULLRICH, H
BACKENSTOSS, G
WEBER, P
WEYER, HJ
FURIC, M
PETKOVIC, T
机构：
[1] UNIV KARLSRUHE,INST EXPTL KERNPHYS,D-76021 KARLSRUHE,GERMANY
[2] UNIV BASEL,INST PHYS,CH-4056 BASEL,SWITZERLAND
[3] UNIV ZAGREB,FAC SCI,ZAGREB 41000,CROATIA
[4] UNIV ZAGREB,FAC ELECT ENGN,ZAGREB 41000,CROATIA
来源：
NUCLEAR PHYSICS A | 1995年 / 589卷 / 04期
关键词：
HE-4(PI-; 2N); (PI-; NP); DN); NT); E AT REST; T-PI=0 MEV; MEASURED PARTICLE PAIRS ENERGY; SIGMA(THETA); DEDUCED BRANCHING RATIOS;
D O I：
10.1016/0375-9474(95)00068-C
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The emission of nn, np-, nd- and nt-pairs following pi(-)-capture in gaseous He-4 has been studied in a coincidence experiment. Quasifree 2N-absorption is the dominant absorption mechanism with a ratio of r = 4.0(-1.5)(+0.8) for absorption on a nucleon pair with isospin I = 0 and I = 1. Also collinear processes involving more than two nucleons have been observed, including NN final-state interaction with small relative momenta as well as emission of deuterons and tritons. Upper limits are given for phase-space-distributed, i.e. non-collinear 3N- and nnd-emission.
引用
收藏
页码：553 / 584
页数：32
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