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Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→Fe54 Reaction at Relativistic Energies

Podolyak, Z, Shand, CM, Lalovic,, N, Gerl, J, Rudolph, D, Alexander, T, Boutachkov, P, Cortes, ML, Gorska, M, Kojouharov, I, Kurz, N, Louchart, C, Merchan, E, Michelagnoli, C, Perez-Vidal, RM, Pietri, S, Ralet, D, Reese, M, Schaffner, H, Stahl, C, Weick, H, Ameil, F, de Angelis, G, Arici, T, Carroll, R, Dombradi, Z, Gadea, A, Golubev, P, Lettmann, M, Lizarazo, C, Birkenbach, B, Bruyneel, B, Burrows, I, Charles, L, Clement, E, Crespi, FCL, Cullen, DM, Desesquelles, P, Eberth, J, Gonzalez, V, Habermann, T, Harkness-Brennan, L, Hess, H, Judson, DS, Jungclaus, A, Korten, W, Labiche, M, Maj, A, Mengoni, D, Napoli, DR, Pullia, A, Quintana, B, Rainovski, G, Reiter, P, Salsac, MD, Sanchis, E and Valiente Dobon, JJ (2016) Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→Fe54 Reaction at Relativistic Energies Physical Review Letters, 117 (22), 222302.

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Abstract

The Fe54 nucleus was populated from a Fe56 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 Fe56 ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of Fe54, 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 Fe54 is a consequence of the quark structure of the nucleons.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Podolyak, ZUNSPECIFIEDUNSPECIFIED
Shand, CMUNSPECIFIEDUNSPECIFIED
Lalovic,, NUNSPECIFIEDUNSPECIFIED
Gerl, JUNSPECIFIEDUNSPECIFIED
Rudolph, DUNSPECIFIEDUNSPECIFIED
Alexander, TUNSPECIFIEDUNSPECIFIED
Boutachkov, PUNSPECIFIEDUNSPECIFIED
Cortes, MLUNSPECIFIEDUNSPECIFIED
Gorska, MUNSPECIFIEDUNSPECIFIED
Kojouharov, IUNSPECIFIEDUNSPECIFIED
Kurz, NUNSPECIFIEDUNSPECIFIED
Louchart, CUNSPECIFIEDUNSPECIFIED
Merchan, EUNSPECIFIEDUNSPECIFIED
Michelagnoli, CUNSPECIFIEDUNSPECIFIED
Perez-Vidal, RMUNSPECIFIEDUNSPECIFIED
Pietri, SUNSPECIFIEDUNSPECIFIED
Ralet, DUNSPECIFIEDUNSPECIFIED
Reese, MUNSPECIFIEDUNSPECIFIED
Schaffner, HUNSPECIFIEDUNSPECIFIED
Stahl, CUNSPECIFIEDUNSPECIFIED
Weick, HUNSPECIFIEDUNSPECIFIED
Ameil, FUNSPECIFIEDUNSPECIFIED
de Angelis, GUNSPECIFIEDUNSPECIFIED
Arici, TUNSPECIFIEDUNSPECIFIED
Carroll, RUNSPECIFIEDUNSPECIFIED
Dombradi, ZUNSPECIFIEDUNSPECIFIED
Gadea, AUNSPECIFIEDUNSPECIFIED
Golubev, PUNSPECIFIEDUNSPECIFIED
Lettmann, MUNSPECIFIEDUNSPECIFIED
Lizarazo, CUNSPECIFIEDUNSPECIFIED
Birkenbach, BUNSPECIFIEDUNSPECIFIED
Bruyneel, BUNSPECIFIEDUNSPECIFIED
Burrows, IUNSPECIFIEDUNSPECIFIED
Charles, LUNSPECIFIEDUNSPECIFIED
Clement, EUNSPECIFIEDUNSPECIFIED
Crespi, FCLUNSPECIFIEDUNSPECIFIED
Cullen, DMUNSPECIFIEDUNSPECIFIED
Desesquelles, PUNSPECIFIEDUNSPECIFIED
Eberth, JUNSPECIFIEDUNSPECIFIED
Gonzalez, VUNSPECIFIEDUNSPECIFIED
Habermann, TUNSPECIFIEDUNSPECIFIED
Harkness-Brennan, LUNSPECIFIEDUNSPECIFIED
Hess, HUNSPECIFIEDUNSPECIFIED
Judson, DSUNSPECIFIEDUNSPECIFIED
Jungclaus, AUNSPECIFIEDUNSPECIFIED
Korten, WUNSPECIFIEDUNSPECIFIED
Labiche, MUNSPECIFIEDUNSPECIFIED
Maj, AUNSPECIFIEDUNSPECIFIED
Mengoni, DUNSPECIFIEDUNSPECIFIED
Napoli, DRUNSPECIFIEDUNSPECIFIED
Pullia, AUNSPECIFIEDUNSPECIFIED
Quintana, BUNSPECIFIEDUNSPECIFIED
Rainovski, GUNSPECIFIEDUNSPECIFIED
Reiter, PUNSPECIFIEDUNSPECIFIED
Salsac, MDUNSPECIFIEDUNSPECIFIED
Sanchis, EUNSPECIFIEDUNSPECIFIED
Valiente Dobon, JJUNSPECIFIEDUNSPECIFIED
Date : 23 November 2016
Identification Number : https://doi.org/10.1103/PhysRevLett.117.222302
Copyright Disclaimer : © 2016 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 08 Dec 2016 13:52
Last Modified : 08 Dec 2016 13:52
URI: http://epubs.surrey.ac.uk/id/eprint/813076

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