A technique for producing a high-quality radioactive Ni-56 (T-1/2 = 6.1 d) beam via the two-accelerator method has been developed. Beam intensities of 2 x 10(-7) Ni-56/s were extracted from the ion source and 2 x 10(4) Ni-56/s were delivered to the target. For a study of neutron transfer reactions in inverse kinematics, a high-efficiency detection system was built consisting of a large solid angle (2.8 sr) high-granularity Si detector array for measuring the outgoing protons in coincidence with the heavy reaction products identified with respect to mass A and nuclear charge Z in the focal plane of a recoil mass separator. (C) 2000 Elsevier Science B.V. All rights reserved.

The single-particle character of states outside the doubly magic (radioactive) nucleus ${}^{56}\mathrm{Ni}$ has been determined through a measurement of the $(d,p)$ neutron transfer reaction using inverse kinematics. From the spectroscopic factors of the low-lying states in ${}^{57}\mathrm{Ni}$, the astrophysically interesting yield for the ${}^{56}\mathrm{Ni}(p,\ensuremath{\gamma})$ reaction to the mirror nucleus ${}^{57}\mathrm{Cu}$ has been calculated, utilizing charge symmetry. The rate for this reaction in the temperature range typical of novae, supernovae, and x-ray bursts is found to be more than 10 times higher than previously assumed.

The single-particle character of states outside the doubly magic (radioactive) nucleus 56Ni has been determined through a measurement of the sd, pd neutron transfer reaction using inverse kinematics. From the spectroscopic factors of the low-lying states in 57Ni, the astrophysically interesting yield for the 56Nisp, gd reaction to the mirror nucleus 57Cu has been calculated, utilizing charge symmetry. The rate for this reaction in the temperature range typical of novae, supernovae, and x-ray bursts is found to be more than 10 times higher than previously assumed. [S0031-9007(97)05085-0]

The single-particle character of states outside the doubly magic (radioactive) nucleus Ni-56 has been determined through a measurement of the (d,p) neutron transfer reaction using inverse kinematics. From the spectroscopic factors of the low-lying states in Ni-57, the astrophysically interesting yield for the Ni-56(p,gamma) reaction to thr mirror nucleus Cu-57 has been calculated, utilizing charge symmetry. The rate for this reaction in the temperature range typical of novae, supernovae, and x-ray bursts is found to be more than 10 times higher than previously assumed. [S0031-9007(97)05085-0].