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

Denis Bacelar, AM, Bruce, AM, Lalkovski, S, 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 and Szarka, I (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, 723 (4-5). pp. 302-306.

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Isomeric ratios have been measured for high-spin states in Po84198,200,206,208, At85208,209,210,211, Rn86210,211,212,213,214, Fr87208,211,212,213,214, Ra88210,211,212,214,215, and Ac89215 following the projectile fragmentation of a 1 AGeV 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 55/2ℏ 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Denis Bacelar, AM
Bruce, AM
Lalkovski, S
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
Date : 25 June 2013
DOI : 10.1016/j.physletb.2013.05.033
Depositing User : Symplectic Elements
Date Deposited : 29 Jul 2013 10:19
Last Modified : 31 Oct 2017 15:06

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