Atomic Masses in the Region from Iron to Zinc

Quisenberry, K. S.; Scolman, T.T.; Nier, Alfred O.

doi:10.1103/physrev.104.461

Cited by 58 publications

(5 citation statements)

References 17 publications

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“…The P n value at N= 116, derived from nuclear reaction data for iridium, is the only odd-Z neutron pairing energy in the diagram. Pairing energy results in a lower mass region 16 suggest that one would expect an even-Z value at N= 116 to be slightly larger than the present odd-Z value. The previously reported 2 increase in the neutron pairing energy in the neighborhood of N= 90 is shown in Fig.…”

Section: Neutron Binding Energiescontrasting

confidence: 55%

Neutron Separation Energies and Pairing Energies for Heavy Nuclei

Johnson

Bhanot

1957

Phys. Rev.

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A six-inch double-focusing mass spectrometer has been employed to determine 32 mass differences between neighboring isotopes of even-Z elements in the region Z -64 to 82. Neutron separation energies and neutron pairing energies are easily calculated from the experimental results. These calculated values are sufficiently precise to conclude that lack of uniformity in neutron separation energy and pairing energy systematics appears in regions where other nuclear properties exhibit changes in their systematics. Neutron separation energy data have also been employed for the isotopic assignments of several nuclear reactions.

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Section: Neutron Binding Energiescontrasting

confidence: 55%

Neutron Separation Energies and Pairing Energies for Heavy Nuclei

Johnson

Bhanot

1957

Phys. Rev.

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“…11 According to these data, the ground-state gamma-ray energies should be 8.99 Mev for Ni 59 and 7.80 Mev for Ni 61 . Mass-spectroscopic measurements by Quisenberry et aL 12 show that the binding energies should be 8.99 Mev, 7.77 Mev, and 6.82 Mev for Ni 69 , Ni 61 , and Ni 63 , respectively. In the…”

Section: Discussionmentioning

confidence: 97%

Neutron Capture Gamma-Ray Spectra of the Nickel Isotopes

Treado¹,

Chagnon²

1961

Phys. Rev.

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The spectra of gamma radiation following pile-neutron capture in separated isotopes of nickel have been measured with a three-crystal scintillation pair spectrometer as well as with a single-crystal scintillation counter. Energies and intensities of the gamma rays from each isotope are reported. Each of the lines observed with natural nickel has been assigned to Ni 58 (^,7)Ni^, Ni 60 (w,Y)Ni 61 , or Ni 62 (#,Y)Ni 63 . In some cases, gamma rays of nearly identical energies are found in two, or in all three, isotopes. Additional gamma rays not resolved in the natural nickel spectrum appear in Ni 58 (#,y)Ni 59 at 7.65 Mev, and in Ni 60 (w,y)Ni 61 at 7.65 Mev, and in Ni 60 (w,7)Ni 61 at 4.70 and 5.55 Mev. The spectrum of Ni 62 (w,r)Ni 63 is dominated by a strong line at 6.80 Mev, presumably the ground -state transition.

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“…Measurements of atomic masses for most of the stable isotopes with A < 70 have been reported. [1][2][3][4][5] In addition, krypton and xenon, 6 lead and mercury 7 masses have been measured. Operational difficulties in the mass spectrometer become progressively more apparent in measurements of heavy isotopes where maximum resolution is required.…”

Section: Tungstenmentioning

confidence: 99%

Distribution of Partial Radiation Widths

et al. 1963

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The gamma-ray spectra that result from the capture of neutrons in resonances of Hg 199 , Pt 196 , W 183 , and Se 77 are measured. A least-squares fitting of the spectra gives relative values of partial widths for various sets of high-energy radiative transitions. These widths are treated as statistical samples drawn from populations governed by a x 2 distribution with v degrees of freedom. A technique of hypothesis testing that makes use of Monte Carlo calculations is used to derive unbiased values of v from the small samples of experimental widths. The over-all result of the analysis is ^=1.34db0.33±0.21. The previously reported partial radiation widths for resonances of Gd 155 , Yb 173 , Hf 177 , and Hg 201 are also analyzed. The result is v = 1.14±0.44=b0.21. Thus, both sets of data are in good agreement with the value v = l that is expected from the Porter-Thomas description of the distribution of the widths associated with a single exit channel.

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Atomic Masses in the Region from Iron to Zinc

Cited by 58 publications

References 17 publications

Neutron Separation Energies and Pairing Energies for Heavy Nuclei

Neutron Separation Energies and Pairing Energies for Heavy Nuclei

Neutron Capture Gamma-Ray Spectra of the Nickel Isotopes

Distribution of Partial Radiation Widths

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