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19 April 2024

» pubmed » pmid11863952

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Hypernuclear fine structure in (9)(lambda)Be
H Akikawa ; S Ajimura ; R E Chrien ; P M Eugenio ; G B Franklin ; J Franz ; L Gang ; K Imai ; P Khaustov ; M May ; P H Pile ; B Quinn ; A Rusek ; J Sasao ; R I Sawafta ; H Schmitt ; H Tamura ; L Tang ; K Tanida ; L Yuan ; S H Zhou ; L H Zhu ; X F Zhu ;
Date:	25 Feb 2002
Journal:	Phys Rev Lett, 88 (8), 082501
Abstract:	With a germanium detector array (Hyperball), we observed two gamma-ray peaks corresponding to the two transitions (5/2(+)-->1/2(+) and 3/2(+)-->1/2(+)) in the (9)(Lambda)Be hypernucleus which was produced by the 9Be(K-,pi(-)) reaction. The energies of the gamma rays are 3029 +/- 2 +/- 1 keV and 3060 +/- 2 +/- 1 keV. The energy difference was measured to be 31.4(+2.5)(-3.6) keV, which indicates a very small Lambda-spin-dependent spin-orbit force between a Lambda and a nucleon. This is the smallest level splitting by far ever measured in a hypernucleus.
Source:	PubMed, pmid11863952
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