Elsevier

Nuclear Physics A

Volume 94, Issue 2, 13 March 1967, Pages 261-288
Nuclear Physics A

Masses and excitation energies of some proton-rich nuclei

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Abstract

The Q-values for seven (3He, n) reactions have been measured, using a silicon semiconductor detector as a fast-neutron spectrometer, with the following results (final nuclei, Q-values in keV): 26Si, 85±18; 30S, −573±15; 34Ar, −759±15; 42Ti, −2865±6; 48Cr, 5550±18; 56Ni, 4513±14 and 60Zn, 818±18. The following excited states (excitation energies in MeV) were also seen: 26Si, 1.79, 2.80; 30S, 2.19; 34Ar, 2.06; 48Cr, 0.72?, 56Ni, 2.69, 3.95, 6.60 and 60Zn, 1.02. Rough measurements of the 0°(3He,n) cross sections are given. Neutron angular distributions for 28Si(3He, n) to the ground and first excited states of 30S are consistent with assignments of 0+ and 2+. Two gamma rays observed with energies 1.28±0.06 and 2.66±0.1 MeV are attributed to the reaction 54Fe(3He, nγ)56Ni.

The (3He, p) Q-values of nuclear reactions forming 48V, 56Co and 60Cu have been measured with a magnetic spectrometer. Ground state Q-values for 56Co and 60Cu are 7410±10 keV and 5770±12 keV. Many excited states were seen, viz. 48V(3), 56Co(15) and 60Cu(23).

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    Work supported in part by the Office of Naval Research [Nonr-220(47)].

    ††

    Present address: Biophysics Dept., University of Toronto, Toronto, Ontario, Canada.

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