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. 2016 Nov 25;117(22):222302.
doi: 10.1103/PhysRevLett.117.222302. Epub 2016 Nov 23.

Role of the Δ Resonance in the Population of a Four-Nucleon State in the ^{56}Fe→^{54}Fe Reaction at Relativistic Energies

Zs Podolyák  1 , C M Shand  1 , N Lalović  2   3 , J Gerl  3 , D Rudolph  2 , T Alexander  1 , P Boutachkov  3 , M L Cortés  3   4 , M Górska  3 , I Kojouharov  3 , N Kurz  3 , C Louchart  4 , E Merchán  4 , C Michelagnoli  5 , R M Pérez-Vidal  6 , S Pietri  3 , D Ralet  3   4 , M Reese  4 , H Schaffner  3 , Ch Stahl  4 , H Weick  3 , F Ameil  3 , G de Angelis  7 , T Arici  3   8 , R Carroll  1 , Zs Dombrádi  9 , A Gadea  6 , P Golubev  2 , M Lettmann  4 , C Lizarazo  3   4 , D Mahboub  10 , H Pai  4 , Z Patel  1 , N Pietralla  4 , P H Regan  1 , L G Sarmiento  2 , O Wieland  11 , E Wilson  1 , B Birkenbach  12 , B Bruyneel  13 , I Burrows  14 , L Charles  15 , E Clément  5 , F C L Crespi  11   16 , D M Cullen  17 , P Désesquelles  18 , J Eberth  12 , V González  19 , T Habermann  3   4 , L Harkness-Brennan  20 , H Hess  12 , D S Judson  20 , A Jungclaus  21 , W Korten  13 , M Labiche  14 , A Maj  22 , D Mengoni  23   24 , D R Napoli  7 , A Pullia  11   16 , B Quintana  25 , G Rainovski  26 , P Reiter  12 , M D Salsac  13 , E Sanchis  19 , J J Valiente Dóbon  7
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Free article

Role of the Δ Resonance in the Population of a Four-Nucleon State in the ^{56}Fe→^{54}Fe Reaction at Relativistic Energies

Zs Podolyák et al. Phys Rev Lett. .
Free article

Abstract

The ^{54}Fe nucleus was populated from a ^{56}Fe beam impinging on a Be target with an energy of E/A=500 MeV. The internal decay via γ-ray emission of the 10^{+} metastable state was observed. As the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the ^{56}Fe ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of ^{54}Fe, suggesting that it was populated via the decay of the Δ^{0} resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10^{+} metastable state in ^{54}Fe is a consequence of the quark structure of the nucleons.

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