New neutron-deficient isotopes from $^{78}$Kr fragmentation

Bertram Blank (1) , T. Goigoux (1) , P. Ascher (1) , M. Gerbaux (1) , J. Giovinazzo (1) , S. Grévy (1) , T. Kurtukian Nieto (1) , C. Magron (1) , J. Agramunt , A. Algora , V. Guadilla , A. Montaner-Piza , A. I. Morales , S. E. A. Orrigo , B. Rubio , D. S. Ahn , P. Doornenbal , N. Fukuda , N. Inabe , G. Kiss , T. Kubo , S. Kubono , S. Nishimura , V. H. Phong , H. Sakurai , Y. Shimizu , P.A. Soderstrom , T. Sumikama , H. Suzuki , H. Takeda , J. Wu , Y. Fujita , M. Tanaka , W. Gelletly , P. Aguilera , F. Molina , F. Diel , D. Lubos , G. de Angelis , D. Napoli , C. Borcea (2) , A. Boso , R. B. Cakirli , E. Ganioglu , J. Chiba , D. Nishimura , H. Oikawa , Y. Takei , S. Yagi , K. Wimmer , G. de France (3) , S. Go

1 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 NIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering
3 GANIL - Grand Accélérateur National d'Ions Lourds

In an experiment with the BigRIPS separator at the RIKEN Nishina Center, the fragmentation of a $^{78}$Kr beam allowed the observation of new neutron-deficient isotopes at the proton drip-line. Clean identification spectra could be produced and $^{63}$Se, $^{67}$Kr, and $^{68}$Kr were identified for the first time. In addition, $^{59}$Ge was also observed. Three of these isotopes, $^{59}$Ge, $^{63}$Se, and $^{67}$Kr, are potential candidates for ground-state two-proton radioactivity. In addition, the isotopes $^{58}$Ge, $^{62}$Se, and $^{66}$Kr were also sought but without success. The present experiment also allowed the determination of production cross sections for some of the most exotic isotopes. These measurements confirm the trend already observed that the empirical parameterization of fragmentation cross sections, EPAX, significantly overestimates experimental cross sections in this mass region.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

Bertram Blank, T. Goigoux, P. Ascher, M. Gerbaux, J. Giovinazzo, et al.. New neutron-deficient isotopes from $^{78}$Kr fragmentation. Physical Review C, 2016, 93 (6), pp.061301. ⟨10.1103/PhysRevC.93.061301⟩. ⟨in2p3-01318804⟩