The mass of 65Co

doi:10.1016/0375-9474(78)90427-X

Nuclear Physics A

Volume 307, Issue 1, 4 September 1978, Pages 71-76

https://doi.org/10.1016/0375-9474(78)90427-X Get rights and content

Abstract

The five-nucleon pickup reaction ⁷⁰Zn(³He, ⁸B)⁶⁵Co has been employed to observe the $T_{z} = 112$ ⁶⁵Co nucleus. The ⁶⁵Co mass excess is found to be −59168±20 keV. Comparison is made to recent predictions.

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This half-life agrees with the currently adopted value of 0.30(3) s. Previously, several measurements of different incorrect half-life measurements were reported, for example, 4–5 min by Parmley et al. [38], 2.0(2) and 7.8(2) min for the ground and an isomeric state, respectively, by Preiss and Fink [42], and 28(2) s by Strain and Ross [41]. Kouzes and Mueller reported the first observation of 65Co in the 1978 paper, “The mass of 65Co” [43]. The Princeton University AVF Cyclotron was used to accelerate 3He to 80 MeV which bombarded an enriched 70Zr target and 65Co was produced in the five-nucleon pickup reaction 70Zn(3He,8B).
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A 36 $mg cm^{2}$ thick ^natW target was irradiated with 11.5 MeV/u ⁷⁶Ge of 15 to 20 particle-nA beam intensity. On-line mass-separated samples of projectile-like neutron-rich products from multi-nucleon transfer-reactions were investigated in the region of mass 58–69 by β and γ-ray spectroscopy. The new isotope ⁶⁰Cr was identified with a half-life of 0.57 (6) s and for the ⁶⁰Mn ground state a half-life value of 51 (6) s was obtained. Decay schemes were constructed for ⁵⁸Cr, ⁵⁸Mn ( $t_{12} = 3 s$ ), ^65,66,67Co and ⁶⁹Ni. One new γ-ray was found in the decay of ⁵⁹Cr. The Q_β value of ⁶⁶Co was measured yielding 9.7 (5) MeV. The comparison of the measured new β half-life of ⁶⁰Cr with the most recent predictions gave again an enhancement of the experimental value.
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A 46 mg/cm² thick ^natW target was irradiated with an 11.5 MeV/u ⁸²Se beam. On-line massseparated samples of projectile-like neutron-rich products from multi-nucleon transfer reactions were investigated by βγ spectroscopy in the mass region A = 52–79. Decay properties of the nuclei ⁶¹Mn (0.71 s), ⁶⁴Fe (2.0 s), ⁶⁵Co (1.25 s), ⁶⁹Ni (10 s) and ^73mZn (5.8 s) were measured for the first time. For ⁶⁷Ni a decay scheme could be constructed using information from new γ-transitions. The known decay schemes of ⁶⁰Mn, ⁶³Fe, ⁶³Co and ⁶⁹Cu were extended. New half-life values of neutron-rich isotopes are compared with theoretical predictions.

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^☆: Work supported in part by the National Science Foundation.

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The mass of 65Co☆

Abstract

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The mass of ⁶⁵Co☆