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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 :
NameEmailORCID
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
Valiente Dobon, JJ
Date : 23 November 2016
Identification Number : 10.1103/PhysRevLett.117.222302
Copyright Disclaimer : © 2016 American Physical Society
Depositing User : Symplectic Elements
Date Deposited : 08 Dec 2016 13:52
Last Modified : 31 Oct 2017 19:00
URI: http://epubs.surrey.ac.uk/id/eprint/813076

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