186Re: Nuclear structure and an isomer of half-life 2 × 105 y

Seegmiller, David W.; Lindner, M.; Meyer, R.A.

doi:10.1016/0375-9474(72)90553-2

Cited by 24 publications

(21 citation statements)

References 10 publications

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“…Of the primary transitions identified in this way, 50 were not previously reported in the evaluated literature (Refs. [57][58][59][60]). Of these 50 new primary transitions, 35 feed levels in the adopted level scheme for 186 Re [10].…”

Section: Resultsmentioning

confidence: 99%

“…As a result, no P-D comparison could be made. Calculations that include this level result in a cross section for populating the isomer equal to 0.071 (24) [57] and 0.54(11)% [62]. When combined with the adopted value of σ 0 = 112(2) b for populating the 186 Re ground state [35], these ratios yield isomer cross sections of 0.34(10) b and 0.60(12) b, respectively.…”

Section: Isomer Feeding Multipole Mixing and Branching Ratiosmentioning

confidence: 99%

“…In the adopted level scheme for 186 Re, there are no transitions out of this level to lower-lying levels [10], although a ∼12-keV E2 transition to the J π = 4 − , 174.1-keV level and a ∼38-keV M 2 transition to the 148.2-keV isomer have been proposed in the literature (Refs. [58], [57], and [59]). Both transitions would be highly converted (α = 7.1 × 10 4 for the ∼12-keV transition and α = 1.0 × 10 3 for the ∼38-keV transition), and their energies would be sufficiently low that they would not be observable in the prompt 185 Re(n, γ) spectrum of this work.…”

Section: Isomer Feeding Multipole Mixing and Branching Ratiosmentioning

confidence: 99%

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Investigation ofRe186via radiative thermal-neutron capture onRe185

et al. 2016

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Partial γ-ray production cross sections and the total radiative thermal-neutron capture cross section for the 185 Re(n, γ) 186 Re reaction were measured using the Prompt Gamma Activation Analysis facility at the Budapest Research Reactor with an enriched 185 Re target. The 186 Re cross sections were standardized using well-known 35 Cl(n, γ) 36 Cl cross sections from irradiation of a stoichiometric nat ReCl3 target. The resulting cross sections for transitions feeding the 186 Re ground state from low-lying levels below a cutoff energy of Ec = 746 keV were combined with a modeled probability of ground-state feeding from levels above Ec to arrive at a total cross section of σ0 = 111(6) b for radiative thermal-neutron capture on 185 Re. A comparison of modeled discrete-level populations with measured transition intensities led to proposed revisions for seven tentative spin-parity assignments in the adopted level scheme for 186 Re. Additionally, 102 primary γ-rays were measured, including 50 previously unknown. A neutron-separation energy of Sn = 6179.59(5) keV was determined from a global least-squares fit of the measured γ-ray energies to the known 186 Re decay scheme. The total capture cross section and separation energy results are comparable to earlier measurements of these values.

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Section: Resultsmentioning

confidence: 99%

Section: Isomer Feeding Multipole Mixing and Branching Ratiosmentioning

confidence: 99%

Section: Isomer Feeding Multipole Mixing and Branching Ratiosmentioning

confidence: 99%

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Investigation ofRe186via radiative thermal-neutron capture onRe185

et al. 2016

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“…Using the GErmanium Array for Neutron Induced Excitations (GEANIE) detector array at the Los Alamos Neutron Science Center (LANSCE) Weapons Neutron Research (WNR) facility, γ-ray spectra obtained from neutron-induced reactions were used to identify new γ-ray transitions in 186 Re and to verify transitions and levels already described in the existing literature [4,[11][12][13][14][15][16]. The primary neutron-induced reaction studied was 187 Re(n, 2nγ)…”

Section: Andmentioning

confidence: 99%

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
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The spallation neutron source at the Los Alamos Neutron Science Center Weapons Neutron Research facility was used to populate excited states in 186 Re via (n, 2nγ) reactions on an enriched 187 Re target. Gamma rays were detected with the the GErmanium Array for Neutron Induced Excitations spectrometer, a Compton-suppressed array of 18 HPGe detectors. Incident neutron energies were determined by the time-of-flight technique and used to obtain γ-ray excitation functions for the purpose of identifying γ rays by reaction channel. Analysis of the singles γ-ray spectrum gated on the neutron energy range 10 ≤ En ≤ 25 MeV resulted in five transitions and one level added to the 186 Re level scheme. The additions include the placement of three γ rays at 266.7, 381.2, and 647.7 keV which have been identified as feeding the 2.0 × 10 5 yr, J π = (8 + ) isomer and yield an improved value of 148.2(5) keV for the isomer energy. These transitions may have astrophysical implications related to the use of the Re/Os cosmochronometer.

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“…Important data about depopulation of high spin levels have been obtained in the decay study [4] of the long-lived (2 × 10 5 years) isomer of 186 Re. However, a number of unsolved structure problems remained, especially for positive parity levels.…”

Section: Introductionmentioning

confidence: 99%

Levels of¹⁸⁶Re populated in thermal neutron capture reaction

Bērziņš

Krasta

Simonova

et al. 2015

EPJ Web of Conferences

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Abstract. Levels of 186 Re have been studied in the thermal neutron capture reaction with an enriched 185 Re target. Evaluation of spectrum measured with GAMS5 allowed to obtain energies and intensities of more than 500 γ-lines assigned to 186 Re. Most of the obtained transitions have been placed in the model-independent level scheme of the doubly odd 186 Re nucleus, taking into account the available data of earlier experiments as well as the results of recent 187 Re(p, d) 186 Re reaction measurements. Structure of the 186 Re low-lying levels has been analysed in terms of the particle-plus-rotor coupling model.

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186Re: Nuclear structure and an isomer of half-life 2 × 105 y

Cited by 24 publications

References 10 publications

Investigation ofRe186via radiative thermal-neutron capture onRe185

Investigation ofRe186via radiative thermal-neutron capture onRe185

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
View full text Add to dashboard Cite

Levels of¹⁸⁶Re populated in thermal neutron capture reaction

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186Re: Nuclear structure and an isomer of half-life 2 × 105 y

Cited by 24 publications

References 10 publications

Investigation ofRe186via radiative thermal-neutron capture onRe185

Investigation ofRe186via radiative thermal-neutron capture onRe185

New transitions and feeding of theJπ=(8+)isomer inRe186Matters1, Fotiades2, Carroll3 et al. 2015Phys. Rev. C71100View full textAdd to dashboardCite

Levels of186Re populated in thermal neutron capture reaction

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Product

Resources

About

New transitions and feeding of theJπ=(8+)isomer inRe186
Matters
¹
,
Fotiades
²
,
Carroll
³

et al. 2015
Phys. Rev. C
7
1
10
0
View full text Add to dashboard Cite

Levels of¹⁸⁶Re populated in thermal neutron capture reaction