Discovery and cross-section measurement of neutron-rich isotopes in the element range from neodymium to platinum with the FRS

Kurcewicz, J.; Farinon, F.; Geißel, H.; Piétri, S.; Nociforo, C.; Procházka, A.; Weick, H.; Winfield, J. S.; Estradé, A.; Allegro, P.R.P.; Bail, A.; Bélier, G.; Benlliure, J.; Benzoni, G.; Bunce, M.; Bowry, M.; Caballero-Folch, R.; Dillmann, I.; Evdokimov, A.; Gerl, J.; Gottardo, A.; Gregor, E.; Janik, R.; Kelić-Heil, A.; Knöbel, R.; Kubo, T.; Litvinov, Yu. A.; Merchán, E.; Mukha, I.; Naqvi, F.; Pfützner, M.; Pomorski, M.; Podolyák, Zs.; Regan, P. H.; Riese, B.; Ricciardi, M. V.; Scheidenberger, C.; Sitár, B.; Spiller, P.; Stadlmann, J.; Strmeň, P.; Sun, B.; Szarka, I.; Taïeb, J.; Terashima, S.; Valiente-Dobón, J. J.; Winkler, M.; Woods, P. J.

doi:10.1016/j.physletb.2012.09.021

Cited by 135 publications

(59 citation statements)

References 27 publications

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“…Proton removal reactions from high energy heavy projectiles like U and Pb can also be used for the production of neutron rich nuclei in the lead region [3], but the reaction cross section drops drastically for more neutron rich products (see Fig.2). Due to the low intensity of radioactive beams and low neutron fluxes in existing nuclear reactors the second and third methods seem to be unrealizable.…”

Section: Physics Objectivesmentioning

confidence: 99%

GALS – setup for production and study of heavy neutron rich nuclei

Zemlyanoy

Zagrebaev

Козулин

et al. 2015

EPJ Web of Conferences

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Abstract. The present limits of the upper part of the nuclear map are very close to stability while the unexplored area of heavy neutron-rich nuclides along the neutron closed shell N = 126 below 208 Pb is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r-process of astrophysical nucleosynthesis. This area of the nuclear map can be reached neither in fusion-fission reactions nor in fragmentation processes widely used nowadays for the production of exotic nuclei. A new way was recently proposed for the production of these nuclei via low-energy multi-nucleon transfer reactions. The estimated yields of neutron-rich nuclei are found to be significantly high in such reactions and several tens of new nuclides can be produced, for example, in the near-barrier collision of 136 Xe with 208 Pb. A new setup is proposed to produce and study heavy neutron-rich nuclei located along the neutron closed shell N=126.

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Section: Physics Objectivesmentioning

confidence: 99%

GALS – setup for production and study of heavy neutron rich nuclei

Zemlyanoy

Zagrebaev

Козулин

et al. 2015

EPJ Web of Conferences

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“…A 1000 A·MeV 238 U projectile beam with an intensity of 10 9 /s impinged on a 1.6 g/cm 2 thick beryllium target placed at the entrance of the FRS [2,11]. The heavy reaction products Z>60 were separated with the FRS operated in an overall achromatic ion-optical mode.…”

Section: Discovery Of New Neutron-rich Isotopesmentioning

confidence: 99%

“…The contribution of each reaction type was determined for the observed nuclides by the ABRABLA code [14]. In Figure 3 an example is shown for the measured Sm and Pt isotopes [2] compared with different theoretical predictions. Results from a previous FRS experiment using a hydrogen production are included (open circles) [15].…”

Section: Discovery Of New Neutron-rich Isotopesmentioning

confidence: 99%

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

Geißel

Chen

Dickel

et al. 2014

EPJ Web of Conferences

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Abstract.Precision experiments with relativistic fragments separated in-flight require special experimental methods to overcome the inherent large emittance from the creation in nuclear reactions and atomic interactions in matter. At GSI relativistic exotic nuclei have been produced via uranium projectile fragmentation and fission and investigated with the inflight separator FRS directly, or in combination with either the storage-cooler ring ESR or the FRS Ion Catcher. 1000 A·MeV 238 U ions were used to create 60 new neutron-rich isotopes separated and identified with the FRS to measure their production cross sections. In another experimental campaign the fragments were separated in flight and injected into the storage-cooler ring ESR for accurate mass and lifetime measurements. In these experiments we have obtained accurate new mass values analyzed via a novel method which has reduced the systematic errors for both Schottky Mass Spectrometry (SMS) and for Isochronous Mass Spectrometry (IMS). Pioneering experiments have been carried out with the FRS Ion Catcher consisting of three experimental components, the dispersive magnetic system of the FRS with a monoenergetic and a homogeneous degrader, a cryogenic stopping cell filled with pure helium and a multiple-reflection time-of flight mass separator. The FRS Ion Catcher enables high precision spectroscopy experiments with eV to keV exotic nuclides. Results from these different FRS experiments are presented in this overview together with prospects for the next-generation facility Super-FRS. The novel features of the Super-FRS compared with the present FRS will be discussed in addition.

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“…The osmium isotopes currently represent the best opportunity to probe the evolution of nuclear structure across the 82 N 126 neutron shell. The existence of the osmium isotopes in an uninterrupted sequence from 161 Os 85 [1] to 203 Os 127 [2] has been established [2,3], while excited states have been identified in these known nuclei below 200 Os 124 [4] with the exception of the odd-mass isotopes below N = 89. The excitation level schemes across the shell reveal the transitions between the single-particle and collective regimes as a function of neutron number.…”

Section: Introductionmentioning

confidence: 99%

Low-lying excited states in the neutron-deficient isotopes163Os and165Os

et al. 2013

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Excited states in the neutron-deficient isotopes 163 Os and 165 Os were identified using the JUROGAM and GREAT spectrometers in conjunction with the RITU gas-filled separator. Kr,2p3n) reactions at bombarding energies of 270 MeV and 357 MeV, respectively. Gamma-ray emissions from these nuclei have been established unambiguously using the recoil-decay tagging technique and a coincidence analysis has allowed level schemes to be established. These results suggest that the yrast states are based upon negative-parity configurations originating from the νf 7/2 and νh 9/2 orbitals.

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Discovery and cross-section measurement of neutron-rich isotopes in the element range from neodymium to platinum with the FRS

Cited by 135 publications

References 27 publications

GALS – setup for production and study of heavy neutron rich nuclei

GALS – setup for production and study of heavy neutron rich nuclei

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

Low-lying excited states in the neutron-deficient isotopes163Os and165Os

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