Search for the η-mesic 4He with WASA-at-COSY

被引：3
作者：
Krzemien, W. [1 ]
Moskal, P. [1 ]
Smyrski, J. [1 ]
Skurzok, M. [1 ]
机构：
[1] Jagiellonian Univ, M Smoluchowski Inst Phys, PL-30059 Krakow, Poland
来源：
INPC 2013 - INTERNATIONAL NUCLEAR PHYSICS CONFERENCE, VOL. 2 | 2014年 / 66卷
关键词：
BOUND-STATE; NUCLEI;
D O I：
10.1051/epjconf/20146609009
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We conduct a search for the He-eta bound state with the WASA-at-COSY facility measuring the excitation functions for the reaction channels: dd -> (3)Hep pi(-) and dd -> (3)Hen pi(0), where the outgoing N-pi pairs originate from the conversion of the eta meson on a nucleon inside the He nucleus. Two dedicated experiments were performed at the Cooler Synchrotron COSY-Julich with the WASA detector. The analysis of the 2008 data shows no signal of the He-4 - eta bound state. An upper limit for the cross-section for the bound state formation and decay in the process dd -> (He-4 - eta)(bound) -> (3)Hep pi(-), was determined at the 90 % confidence level. In November 2010 a new data set was collected.
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页数：4
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