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The population of metastable states as a probe of relativistic-energy fragmentation reactions

Denis Bacelar, AM, Bruce, AM, Podolyák, Z, Al-Dahan, N, Alkhomashi, N, Cullen, IJ, Deo, AY, Farrelly, GF, Gelletly, W, Regan, PH , Steer, SJ, Swan, TPD, Walker, PM, Górska, M, Pietri, S, Ricciardi, MV, Boutachkov, P, Domingo-Pardo, C, Farinon, F, Geissel, H, Gerl, J, Goel, N, Grȩbosz, J, Hoischen, R, Kojouharov, I, Kurz, N, Nociforo, C, Prochazka, A, Prokopowicz, W, Schmidt, K-H, Schaffner, H, Weick, H, Wollersheim, HJ, Detistov, P, Algora, A, Molina, F, Rubio, B, Dombradi, Z, Benlliure, J, Morales, AI, Verma, S, Bracco, A, Leoni, S, Montanari, D, Nicolini, R, Calore, E, Napoli, DR, Valiente-Dobón, JJ, Casarejos, E, Doncel, M, Rudolph, D, Musumarra, A, Steiger, K, Strmen, P, Szarka, I and Lalkovski, S (2013) The population of metastable states as a probe of relativistic-energy fragmentation reactions Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics.

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Abstract

Isomeric ratios have been measured for high-spin states in Po, At, Rn, Fr, Ra, and Ac following the projectile fragmentation of a 1 A GeV U beam by a Be target at GSI Helmholtzzentrum für Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 μs and spin values up to 55 / 2 ℏ were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion-ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values. © 2013 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Denis Bacelar, AM
Bruce, AM
Podolyák, Z
Al-Dahan, N
Alkhomashi, N
Cullen, IJ
Deo, AY
Farrelly, GF
Gelletly, W
Regan, PH
Steer, SJ
Swan, TPD
Walker, PM
Górska, M
Pietri, S
Ricciardi, MV
Boutachkov, P
Domingo-Pardo, C
Farinon, F
Geissel, H
Gerl, J
Goel, N
Grȩbosz, J
Hoischen, R
Kojouharov, I
Kurz, N
Nociforo, C
Prochazka, A
Prokopowicz, W
Schmidt, K-H
Schaffner, H
Weick, H
Wollersheim, HJ
Detistov, P
Algora, A
Molina, F
Rubio, B
Dombradi, Z
Benlliure, J
Morales, AI
Verma, S
Bracco, A
Leoni, S
Montanari, D
Nicolini, R
Calore, E
Napoli, DR
Valiente-Dobón, JJ
Casarejos, E
Doncel, M
Rudolph, D
Musumarra, A
Steiger, K
Strmen, P
Szarka, I
Lalkovski, S
Date : 2013
DOI : 10.1016/j.physletb.2013.05.033
Additional Information : NOTICE: this is the author’s version of a work that was accepted for publication in Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 723(4-5), June 2013, DOI 10.1016/j.physletb.2013.05.033.
Depositing User : Symplectic Elements
Date Deposited : 04 Jul 2013 12:22
Last Modified : 31 Oct 2017 15:06
URI: http://epubs.surrey.ac.uk/id/eprint/780275

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