The γ-decay of the g92 analogue state in 59Cu

doi:10.1016/0375-9474(75)90085-8

Nuclear Physics A

Volume 245, Issue 1, 23 June 1975, Pages 133-146

https://doi.org/10.1016/0375-9474(75)90085-8 Get rights and content

Abstract

An investigation of the γ-decay of the $1 g_{92}$ analogue state in ⁵⁹Cu has been performed using the ⁵⁸Ni(p, γ)⁵⁹Cu reaction. The (p, γ) excitation function has been taken in the range E_p = 3450–3650 keV. The decay schemes of the (p, γ) resonances at E_p = 3483, 3532 and 3547 keV, measured with Ge(Li) detectors, lead to eight new levels in ⁵⁹Cu with excitation energies between 1.8 and 4.7 MeV and to spin assignments of several states. The spins of the first two resonances are found to be ( $12$ , $32$ ) and ( $52$ ). The spin of the E_p = 3547 keV resonan is, from angular distributions, uniquely determined to be $J^{π} = 92^{+}$ and this state is found to be the unfragmented analogue state of the $E^{∗} = 3.062 MeV$ , $J^{π} = 92^{+}$ parent state in ⁵⁹Ni. The measured complete decay scheme of this resonance shows that its isovector M1 decay is in disagreement with all existing theoretical predictions.

References (26)

H.V. Klapdor
Phys. Lett.
(1971)
G. Bergdolt et al.
Nucl. Phys.
(1973)
M. Schrader et al.
Nucl. Phys.
(1973)
W.C. Peters et al.
Nucl. Phys.
(1973)
H.V. Klapdor et al.
M. Hirata
Phys. Lett.
(1970)
S.D. Bloom et al.
Nucl. Phys.
(1973)
V.P. Aleshin
Izv. Akad. Nauk SSSR (ser. flz.)
(1973)
I. Szentpétery et al.
Phys. Rev. Lett.
(1972)
J.P. Trentelman et al.
Nucl. Phys.
(1973)

J.B. Marion

Rev. Mod. Phys.

(1966)

J. Mattauch et al.

Nucl. Phys.

(1965)

J.D. Anderson et al.

Phys. Rev.

(1965)

Cited by (26)

Nuclear data sheets for A = 59
2002, Nuclear Data Sheets
Experimental data pertaining to all nuclei with mass number A=59 have been evaluated. Level schemes from both radioactive decay and reaction studies are presented, along with associated tables of experimental data and adopted properties for levels and # rays. This evaluation for A=59, which considers data received by 8 February 2002, supersedes the 1993 evaluation (with a literature cutoff date of August 1993) by Coral M. Baglin, published in update mode in Nuclear Data Sheets 69, 733 (1993).
The thermonuclear reaction rate of 58Si(p,γ)59Cu
1985, Nuclear Physics, Section A
The cross sections of ⁵⁸Ni(p, γ)⁵⁹Cu and ⁵⁸Ni(p, p'γ)⁵⁸Ni have been measured over the bombarding energy range 1.18–4.20 MeV. The measurements were based on observation of the yields of ⁵⁹Cu and ⁵⁸Ni deexcitation γ-rays and also on observation of the yield of γ-rays associated with the β⁺ decay of ⁵⁹Cu. The agreement between the two methods used for ⁵⁸Ni(p, γ)⁵⁹Cu is very good. The cross sections have been compared with the predictions of global statistical-model calculations. The calculations overestimated the ⁵⁸Ni(p, γ)⁵⁹Cu cross section by a factor ∼ 2.5 and the ⁵⁸Ni(p, p'γ)⁵⁸Ni cross section by a factor ∼ 1.5. The energies and (p, γ₀) resonance strengths of sixty-five resonances which feature significant resonance to ground-state transitions were measured. These energies and resonance strengths are compared with other results in the literature and good overall agreement is found. Thermonuclear reaction rates at temperatures representative of those encountered in freeze-out from nuclear statistical equilibrium in exploding stars have been calculated from the data and the results compared with those of four previous measurements reported in the literature, amongst which there is significant disagreement. The present results are in satisfactory agreement with those of the two previous measurements based on stopping-target activation measurements. The significance of the reaction rates for stellar nucleosynthesis calculations is discussed.
The d<inf> 5 2</inf> analog strength in 59Cu
1984, Nuclear Physics, Section A
Nuclear data sheets for A = 59
1983, Nuclear Data Sheets
The shape of the beta strength function and consequences for nuclear physics and astrophysics
1983, Progress in Particle and Nuclear Physics
Investigation of beta strength functions by neutron and gamma-ray spectroscopy. (I). The decay of 87Br, 137I, 85As and 135Sb
1979, Nuclear Physics, Section A
Neutron spectra from the decay of the β⁻ delayed neutron precursors 55.6 sec ⁸⁷Br, 24.5 sec ¹³⁷I, 2.05 sec ⁸⁵As and 1.71 sec ¹³⁵Sb have been studied with high resolution ³He ionization chambers. By γ-ray measurements, the partial neutron emission probabilities to excited states in ⁸⁴Se and ¹³⁴Te have been determined independently. For the neutron-emitter nuclei ⁸⁷Kr and ¹³⁷Xe, from which neutron decay proceeds only to the ground states of the final nuclei, ⁸⁶Kr and ¹³⁶Xe, unique information on the shape of the β⁻ strength function S_β(E) is obtained. For the emitter nuclei ⁸⁵Se and ¹³⁵Te, correlations between neutron transition energies and differences in level energies in ⁸⁴Se and ¹³⁴Te, have defined some levels in ⁸⁵Se and ¹³⁵Te which are strongly fed by β⁻ decay. It is shown that the experimental shape of the β⁻ strength function cannot be explained by the widely used assumptions S_β(E) = const or S_β(E) ∼ ϱ(E) or by the “gross theory” of β-decay, but that it is the result of structures in the low-energy tail of the Gamow-Teller giant resonance (GTGR) expected from general nuclear structure considerations.

View all citing articles on Scopus

View full text

Article preview

Nuclear Physics A

Abstract

References (26)

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Izv. Akad. Nauk SSSR (ser. flz.)

Phys. Rev. Lett.

Nucl. Phys.

Rev. Mod. Phys.

Nucl. Phys.

Phys. Rev.

Cited by (26)

Nuclear data sheets for A = 59

The thermonuclear reaction rate of <sup>58</sup>Si(p,γ)<sup>59</sup>Cu

The d<inf> 5 2</inf> analog strength in <sup>59</sup>Cu

Nuclear data sheets for A = 59

The shape of the beta strength function and consequences for nuclear physics and astrophysics

Investigation of beta strength functions by neutron and gamma-ray spectroscopy. (I). The decay of <sup>87</sup>Br, <sup>137</sup>I, <sup>85</sup>As and <sup>135</sup>Sb