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.
Available under License : See the attached licence file.
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.
|Divisions :||Faculty of Engineering and Physical Sciences > Physics|
|Date :||25 June 2013|
|Identification Number :||10.1016/j.physletb.2013.05.033|
|Depositing User :||Symplectic Elements|
|Date Deposited :||29 Jul 2013 10:19|
|Last Modified :||26 Jun 2015 01:08|
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