Spectroscopy of nuclei approaching the proton drip-line using a secondary-fragmentation technique with the RISING detector array

An experiment utilizing a double fragmentation reaction was performed to study isobaric analogue states in A similar to 50 nuclei approaching the proton drip-line. gamma-ray spectroscopy will be used to identify excited states in the neutron-deficient nuclei produced in the second fragmentation reaction. Excited state level schemes will be obtained, through comparison with states in their well-known mirror partners, along with information on Coulomb effects through measurements of the Coulomb energy differences between isobaric analogue excited states. The validity of isospin symmetry for nuclei approaching the proton drip-line can also be investigated and the information gained will aid in testing and improving fp shell model calculations. The analysis of the collected data is at a preliminary stage and current status of this work is reported

Status of the RISING project at GSI

The FRS-RISING set-up at GSI uses secondary radioactive beams at relativistic energies for nuclear structure studies. At GSI the fragmentation or fission of stable primary beams up to U-238 provide secondary beams with sufficient intensity to perform gamma-ray spectroscopy. The RISING set-up is described and results of the first RISING campaign are presented. New experimental methods at relativistic energies are being investigated. Future experiments focus on state-of-the art nuclear structure physics covering exotic nuclei all over the nuclear chart

Coulomb excitation of 68Ni^{68}Ni at 600 AMeV

none51noneA. BRACCO; G. BENZONI; N. BLASI; S. BRAMBILLA; F. CAMERA; F.C.L. CRESPI; S. LEONI; B. MILLION; D. MONTANARI; M. PIGNANELLI; O. WIELAND; A. MAJ; P. BEDNARCZYK; J. GREBOSZ; M. KMIECIK; W. MECZYNSKI; J. STYCZEN; T. AUMANN; A. BANU; T. BECK; F. BECKER; L. CACERES; P. DOORNENBAL; H. EMLING; J. GERL; H. GEISSEL; M. GORSKA; O. KAVATSYUK; M. KAVATSYUK; I. KOJOUHAROV; N. KURZ; R. LOZEVA; N. SAITO; T. SAITO; H. SHAFFNER; H.J. WOLLERSHEIM; J. JOLIE; P. REITER; N. WARR; G. DE ANGELIS; A. GADEA; D. NAPOLI; S. LENZI; S. LUNARDI; D. BALABANSKI; G. LO BIANCO; C. PETRACHE; A. SALTARELLI; M. CASTOLDI; A. ZUCCHIATTI; J. WALKER; A. BUERGERA., Bracco; G., Benzoni; N., Blasi; S., Brambilla; F., Camera; F. C. L., Crespi; S., Leoni; B., Million; D., Montanari; M., Pignanelli; O., Wieland; A., Maj; P., Bednarczyk; J., Grebosz; M., Kmiecik; W., Meczynski; J., Styczen; T., Aumann; A., Banu; T., Beck; F., Becker; L., Caceres; P., Doornenbal; H., Emling; J., Gerl; H., Geissel; M., Gorska; O., Kavatsyuk; M., Kavatsyuk; I., Kojouharov; N., Kurz; R., Lozeva; N., Saito; T., Saito; H., Shaffner; H. J., Wollersheim; J., Jolie; P., Reiter; N., Warr; G., DE ANGELIS; A., Gadea; D., Napoli; Lenzi, SILVIA MONICA; Lunardi, Santo; D., Balabanski; G., LO BIANCO; C., Petrache; A., Saltarelli; M., Castoldi; A., Zucchiatti; J., Walker; A., Buerge

High angular momentum states populated in fragmentation reactions

AbstractThe population of metastable states produced in relativistic-energy fragmentation of a 238U beam has been measured. For states with angular momentum ≳20ℏ, a much higher population than expected has been observed. By introducing a collective component to the generation of angular momentum the experimental data can be understood. This is the first time that a collective degree of freedom has be shown to play a major role in such high-energy collisions

Neutron-deficient N≈126 nuclei produced in 238U^{238}U fragmentation: population of high-spin states

The population of metastable states produced in relativistic-energy fragmentation of a U-238 beam has been measured. For states with high angular momentum, I=17h and I=21.5h, a higher population than expected has been observed, with the discrepancy increasing with angular momentum. By considering two sources for the angular momentum, related to single-particle and collective motions, a much improved description of the experimental results can be obtained. In addition, new results on the structure of Fr-208, Ra-211 and Ac-216 are reported

A new μs isomer in 136Sb^{136}Sb produced in the projectile fission of 238U^{238}U

The neutron-rich isotope 136Sb has been produced following the relativistic projectile fission of 238U in an experiment performed at the Fragment Separator at GSI, Darmstadt. Delayed γ-ray spectroscopy of the fission products has been performed after isotope separation. A new isomeric state in 136Sb has been populated, and its lifetime measured as T1/2 = 565(50) ns. Realistic and empirical shell-model calculations have been performed and are compared to the experimental observables