Hunting η-bound nuclei

H. Machner

doi:10.1088/1674-1137/34/9/013

Chinese Physics C> 2010, Vol. 34> Issue(9) : 1218-1223 DOI: 10.1088/1674-1137/34/9/013

Hunting η-bound nuclei

H. Machner ^,

¹ Institut fur Kernphysik, Forschungszentrum Julich, 52428 Julich, Germany² Fakultat fur Physik, Universitat Duisburg-Essen, Lotharstr. 1, 47048 Duisburg

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Abstract：
The η meson can be bound to atomic nuclei. Experimental search is discussed in the form of final state interaction for the reactions dp→³Heη and dd→⁴Heη. For the latter case tensor polarized deuterons were used in order to extract the s-wave strength. For both reactions complex scattering lengths are deduced: a³Heη=[±(10.7±0.8_－0.5 ^+0.1)+i.(1.5±2.6_－0.9^+1.0)] fm and a⁴Heη=[±(3.1±0.5)+i.(0±0.5)] fm. In a two-nucleon transfer reaction under quasi-free conditions, p²⁷Al→^³HeX, was investigated. The system X can be the bound ²⁵Mg⊙η at rest. When a possible decay of an intermediate N^*(1535) is required, a highly significant bump shows up in the missing mass spectrum. The data give for a bound state a binding energy of 13.3±1.6 MeV and a width of σ=4.4±1.3 MeV.

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H. Machner. Hunting η-bound nuclei[J]. Chinese Physics C, 2010, 34(9): 1218-1223. doi: 10.1088/1674-1137/34/9/013

H. Machner. Hunting η-bound nuclei[J]. Chinese Physics C, 2010, 34(9): 1218-1223. doi: 10.1088/1674-1137/34/9/013 shu

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Received: 2010-03-04
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Hunting η-bound nuclei

H. Machner ^,

Corresponding author: H. Machner,

¹ Institut fur Kernphysik, Forschungszentrum Julich, 52428 Julich, Germany² Fakultat fur Physik, Universitat Duisburg-Essen, Lotharstr. 1, 47048 Duisburg

Received Date: 2010-03-04
Accepted Date: 1900-01-01
Available Online: 2010-09-05

Abstract:

The η meson can be bound to atomic nuclei. Experimental search is discussed in the form of final state interaction for the reactions dp→³Heη and dd→⁴Heη. For the latter case tensor polarized deuterons were used in order to extract the s-wave strength. For both reactions complex scattering lengths are deduced: a³Heη=[±(10.7±0.8_－0.5 ^+0.1)+i.(1.5±2.6_－0.9^+1.0)] fm and a⁴Heη=[±(3.1±0.5)+i.(0±0.5)] fm. In a two-nucleon transfer reaction under quasi-free conditions, p²⁷Al→^³HeX, was investigated. The system X can be the bound ²⁵Mg⊙η at rest. When a possible decay of an intermediate N^*(1535) is required, a highly significant bump shows up in the missing mass spectrum. The data give for a bound state a binding energy of 13.3±1.6 MeV and a width of σ=4.4±1.3 MeV.