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

Podolyák, Zs; Shand, C. M.; Lalovic, Natasa LU ; Gerl, J.; Rudolph, D. LU ; Alexander, T.; Boutachkov, P.; Cortés, M. L.; Górska, M. and Kojouharov, I., et al. (2016) In Physical Review Letters 117(22).
Abstract

The Fe54 nucleus was populated from a 56Fe 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 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 four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in 54Fe is a... (More)

The Fe54 nucleus was populated from a 56Fe 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 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 four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in 54Fe is a consequence of the quark structure of the nucleons.

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Physical Review Letters
volume
117
issue
22
publisher
American Physical Society
external identifiers
  • scopus:84999635744
  • wos:000388630000009
ISSN
0031-9007
DOI
10.1103/PhysRevLett.117.222302
language
English
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yes
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afcd1ed4-feea-4486-9c87-8b57b72c3a79
date added to LUP
2016-12-19 09:26:35
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2017-11-17 18:15:40
@article{afcd1ed4-feea-4486-9c87-8b57b72c3a79,
  abstract     = {<p>The Fe54 nucleus was populated from a 56Fe 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 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 four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in 54Fe is a consequence of the quark structure of the nucleons.</p>},
  articleno    = {222302},
  author       = {Podolyák, Zs and Shand, C. M. and Lalovic, Natasa and Gerl, J. and Rudolph, D. and Alexander, T. and Boutachkov, P. and Cortés, M. L. and Górska, M. and Kojouharov, I. and Kurz, N. and Louchart, C. and Merchán, E. and Michelagnoli, C. and Pérez-Vidal, R. M. and Pietri, S. and Ralet, D. and Reese, M. and Schaffner, H. and Stahl, Ch and Weick, H. and Ameil, F. and De Angelis, G. and Arici, T. and Carroll, R. and Dombrádi, Zs and Gadea, A. and Golubev, P. and Lettmann, M. and Lizarazo, C. and Mahboub, D. and Pai, H. and Patel, Z. and Pietralla, N. and Regan, P. H. and Sarmiento, L. G. and Wieland, O. and Wilson, E. and Birkenbach, B. and Bruyneel, B. and Burrows, I. and Charles, L. and Clément, E. and Crespi, F. C L and Cullen, D. M. and Désesquelles, P. and Eberth, J. and González, V. and Habermann, T. and Harkness-Brennan, L. and Hess, H. and Judson, D. S. and Jungclaus, A. and Korten, W. and Labiche, M. and Maj, A. and Mengoni, D. and Napoli, D. R. and Pullia, A. and Quintana, B. and Rainovski, G. and Reiter, P. and Salsac, M. D. and Sanchis, E. and Valiente Dóbon, J. J.},
  issn         = {0031-9007},
  language     = {eng},
  month        = {11},
  number       = {22},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Role of the Δ Resonance in the Population of a Four-Nucleon State in the 56Fe → 54Fe Reaction at Relativistic Energies},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.117.222302},
  volume       = {117},
  year         = {2016},
}