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Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Muir, D.*; Prchniak, L.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; et al.
Physical Review C, 110(2), p.024318_1 - 024318_16, 2024/08
Times Cited Count:0 Percentile:0.00(Physics, Nuclear)Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; Barton, C. J.*; Bhattacharjee, S. S.*; et al.
Physical Review C, 106(1), p.014312_1 - 014312_9, 2022/07
Times Cited Count:5 Percentile:70.77(Physics, Nuclear)Steer, S. J.*; Podolyk, Z.*; Pietri, S.*; Grska, M.*; Grawe, H.*; Maier, K.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; et al.
Physical Review C, 84(4), p.044313_1 - 044313_22, 2011/10
Times Cited Count:69 Percentile:95.27(Physics, Nuclear)Heavy neutron-rich nuclei were populated via the fragmentation of a E/A=1 GeV Pb beam. Secondary fragments were separated and identified and subsequently implanted in a passive stopper. By the detection of delayed rays, isomeric decays associated with these nuclei have been identified. A total of 49 isomers were detected, with the majority of them observed for the first time. Possible level schemes are constructed and the structure of the nuclei discussed. To aid the interpretation, shell-model as well as BCS calculations were performed.
Qian, J.*; Heinz, A.*; Khoo, T. L.*; Janssens, R. V. F.*; Peterson, D.*; Seweryniak, D.*; Ahmad, I.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; et al.
Physical Review C, 79(6), p.064319_1 - 064319_13, 2009/06
Times Cited Count:33 Percentile:84.76(Physics, Nuclear)-, -, and conversion electron spectroscopy experiments for Rf have been performed using Fragment Mass Analyzer at Argonne National Laboratory. A new isomer with a half-life of 160 s has been discovered in Rf, and it is interpreted as a three-quasiparticle high- isomer. Neutron configurations of one-quasiparticle states in No, the -decay daughter of Rf, have been assigned on the basis of -decay hindrance factors. Excitation energies of the 1/2[620] states in =151 isotones indicate that the deformed shell gap at =152 increases with the atomic number.
Podolyk, Zs.*; Steer, S. J.*; Pietri, S.*; Xu, F. R.*; Liu, H. J.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*; et al.
Physical Review C, 79(3), p.031305_1 - 031305_4, 2009/03
Times Cited Count:38 Percentile:87.43(Physics, Nuclear)rays de-exciting isomeric states in the neutron-rich nucleus Os have been observed following relativistic projectile fragmentation of a 1 GeV per nucleon Pb beam. The ground-state band has properties compatible with oblate deformation. The evolution of the structure of Os isotopes characterized by sudden prolate-oblate shape change is discussed and contrasted with the smooth change known in the Pt chain.
Garnsworthy, A. B.*; Regan, P. H.*; Cceres, L.*; Pietri, S.*; Sun, Y.*; Rudolph, D.*; Grska, M.*; Podolyk, Z.*; Steer, S. J.*; Hoischen, R.*; et al.
Physics Letters B, 660(4), p.326 - 330, 2008/02
Times Cited Count:25 Percentile:78.69(Astronomy & Astrophysics)The low-lying structures of the self-conjugate () nuclei Nb and Tc have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a Ag beam. These represent the heaviest odd-odd nuclei in which internal decays have been identified to date. The resulting level schemes shed light on the shape evolution along the line between the doubly-magic systems Ni and Sn and support a preference for states in odd-odd nuclei at low excitation energies associated with a neutron-proton pairing gap. Comparison with Projected Shell Model calculations suggests that the decay in Nb may be interpreted as an isospin-changing isomer.
Podolyk, Zs.*; Steer, S. J.*; Pietri, S.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*; Gerl, J.*; et al.
European Physical Journal; Special Topics, 150(1), p.165 - 168, 2007/11
Times Cited Count:11 Percentile:55.35(Physics, Multidisciplinary)Relativistic energy projectile fragmentation of Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich Pt N=126 nucleus, following internal decay of two isomeric states, was obtained for the first time. In addition, decays from the previously reported isomeric and states in Tb and Gd, respectively, have been observed. These isomeric decays represent the highest discrete states observed to date following a prejectile fragmentation reaction, and opens up the possibilty of doing "high-spin physics" using this technique.
Pietri, S.*; Regan, P. H.*; Podolyk, Zs.*; Rudolph, D.*; Steer, S. J.*; Garnsworthy, A. B.*; Werner-Malento, E.*; Hoischen, R.*; Grska, M.*; Gerl, J.*; et al.
Nuclear Instruments and Methods in Physics Research B, 261(1-2), p.1079 - 1083, 2007/08
Times Cited Count:94 Percentile:98.36(Instruments & Instrumentation)The first results from the stopped beam RISING experimental campaign performed at the GSI laboratory in Darmstadt, Germany, are presented. RISING constitutes a major new experimental program in European nuclear structure physics research aimed at using relativistic energy (typically around 1 GeV per nucleon) projectile fragmentation reactions to populate nuclei with highly exotic proton-to-neutron ratios compared to the line of beta stability. In its high-efficiency stopped beam configuration, the RISING -ray spectrometer consists of 105 individual germanium crystals which view a focal plane in which the exotic nuclei are brought to rest. Here, decays from metastable states with half-lives in the nano to milliseconds range can be observed. Results of initial commissioning experiments are also shown and details of the planned future experimental program are given.
Regan, P. H.*; Garnsworthy, A. B.*; Pietri, S.*; Caceres, L.*; Grska, M.*; Rudolph, D.*; Podolyk, Zs.*; Steer, S. J.*; Hoischen, R.*; Gerl, J.*; et al.
Nuclear Physics A, 787(1), p.491c - 498c, 2007/05
Times Cited Count:43 Percentile:90.36(Physics, Nuclear)Relativistic energy projectile fragmentation of Pb has been used to produce neutron-rich nuclei with N126. The nuclei of interest were studied by detecting delayed rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich Pt N=126 nucleus, following internal decay of two isomeric states, was obtained for the first time. Raw experimental data and shell-model calculations are presented.
Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*; Ali, F. A.*; Andreoiu, C.*; Ansari, S.*; Ball, G. C.*; Barton, C. J.*; Bhattacharjee, S. S.*; et al.
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Smallcombe, J.; Garnsworthy, A. B.*; Korten, W.*; Singh, P.*
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Shizuma, Toshiyuki; Podolyk, Z.*; Pietri, S.*; Steer, S. J.*; Werner-Malento, E.*; Regan, P. H.*; Rudolph, D.*; Garnsworthy, A. B.*; Hoischen, R.*; Grska, M.*
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We report a result from the measurement of production ratios for isomeric states in neutron-deficient lead nuclei produced following the relativistic projectile fragmentation of Pb. This work forms part of the Rare Isotope Investigations at GSI (RISING) project. The isomeric states in the Pb region were populated using projectile fragmentation of the 1 GeV Pb beam provided using the heavy-ion synchrotron (SIS) at GSI. The fragments producedin the reaction were separated and identified by the FRagment Separator (FRS). Delayed rays emitted from the known 11 and 12 isomers of the neutron deficient nucleus Pb were observed and the corresponding isomeric ratios were determined. The results are compared with a model based on the statistical abrasion-ablation process of relativistic fragmentation and simple assumptions concerning -ray cascade transition in the final nucleus.