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; M. Shand; N. Lalović; J. Gerl; D. Rudolph; T. Alexander; P. Boutachkov; M. Cortés; M. Górska; I. Kojouharov; N. Kurz; C. Louchart; E. Merchán; C. Michelagnoli; M. Pérez-Vidal; S. Pietri; D. Ralet; M. Reese; H. Schaffner; Ch. Stahl; H. Weick; F. Ameil; G. de Angelis; T. Arici; R. Carroll; Zs. Dombrádi; A. Gadea; P. Golubev; M. Lettmann; C. Lizarazo; D. Mahboub; H. Pai; Z. Patel; N. Pietralla; P. Regan; G. Sarmiento; O. Wieland; E. Wilson; B. Birkenbach; B. Bruyneel; I. Burrows; L. Charles; E. Clément; L. Crespi; D. Cullen; P. Désesquelles; J. Eberth; V. González; T. Habermann; L. Harkness-Brennan; H. Hess; D. Judson; A. Jungclaus; W. Korten; M. Labiche; A. Maj; D. Mengoni; D.R. Napoli; A. Pullia; B. Quintana; G. Rainovski; P. Reiter; M.D. Salsac; E. Sanchis; J. j. Valiente Dóbon

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 M. Shand N. Lalović J. Gerl D. Rudolph T. Alexander P. Boutachkov M. Cortés M. Górska I. Kojouharov N. Kurz C. Louchart E. Merchán C. Michelagnoli ¹ M. Pérez-Vidal S. Pietri D. Ralet M. Reese H. Schaffner Ch. Stahl H. Weick F. Ameil G. de Angelis T. Arici R. Carroll Zs. Dombrádi A. Gadea P. Golubev M. Lettmann C. Lizarazo D. Mahboub H. Pai Z. Patel N. Pietralla P. Regan G. Sarmiento O. Wieland E. Wilson B. Birkenbach B. Bruyneel ² I. Burrows L. Charles ³ E. Clément ¹ L. Crespi D. Cullen P. Désesquelles ⁴ J. Eberth V. González T. Habermann L. Harkness-Brennan H. Hess D. Judson A. Jungclaus W. Korten ² M. Labiche A. Maj D. Mengoni D.R. Napoli A. Pullia B. Quintana G. Rainovski P. Reiter M.D. Salsac ² E. Sanchis J. j. Valiente Dóbon

1 GANIL - Grand Accélérateur National d'Ions Lourds

2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

3 IPHC - Institut Pluridisciplinaire Hubert Curien

4 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière

Abstract : The 54Fe nucleus was populated from a 56Fe beam impinging on a Be target with an energy of E=A ¼ 500 MeV. The internal decay via γ-ray emission of the 10þ 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 56Fe ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of 54Fe, suggesting that it was populated via the decay of the Δ0 resonance into a proton. This process allows the population of fournucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10þ metastable state in 54Fe is a consequence of the quark structure of the nucleons.

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

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http://hal.in2p3.fr/in2p3-01401953
Contributor : Michel Lion <>
Submitted on : Thursday, November 24, 2016 - 9:00:18 AM
Last modification on : Thursday, February 7, 2019 - 3:22:32 PM

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

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

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