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Search for the neutron-rich hypernucleus 9{Λ}He

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arxiv 1210.4431 v2 pith:JUZGVBMU submitted 2012-10-16 nucl-ex

Search for the neutron-rich hypernucleus 9{Λ}He

M. Agnello , L. Benussi , M. Bertani , H.C. Bhang , G. Bonomi , E. Botta , M. Bregant , T. Bressani
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S. Bufalino L. Busso D. Calvo P. Camerini B. Dalena F. De Mori G. D Erasmo F.L. Fabbri A. Feliciello A. Filippi E.M. Fiore A. Fontana H. Fujioka P. Genova P. Gianotti N. Grion V. Lucherini S. Marcello N. Mirfakhrai F. Moia O. Morra T. Nagae H. Outa A. Pantaleo V. Paticchio S. Piano R. Rui G. Simonetti R. Wheadon A. Zenoni A. Gal
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keywords decayhypernucleusk-stopneutron-richproductionsearchcoincidenceconfidence
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Search for the neutron-rich hypernucleus 9LHe is reported by the FINUDA experiment at DAFNE, INFN-LNF, studying (pi+, pi-) pairs in coincidence from the K-stop + 9Be --> 9LHe + pi+ production reaction followed by 9LHe --> 9Li + pi- weak decay. An upper limit of the production rate of 9LHe undergoing this two-body pi- decay is determined to be (2.3 +/- 1.9) 10-6/K-stop at 90% confidence level.

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