Nuclear Data Sheets for A = 102

Frenne, D. De

doi:10.1016/j.nds.2009.06.002

Cited by 128 publications

(94 citation statements)

References 179 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all even-nuclei examined here, K was taken as zero, whereas for the odd nuclei the bandhead value of K was used. Since it is usually difficult to determine the centroid energy of the Doppler-broadened lineshapes to a level of accuracy comparable to experiments that produce narrow lineshapes, we have consistently used the evaluated γ-ray energies [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] in our fits and calculations of the state lifetimes.…”

Section: Experimental Details and Analysis Techniquesmentioning

confidence: 99%

Lifetime measurements and nuclear deformation in theA≈100region

et al. 2012

View full text Add to dashboard Cite

The Eurogam-2 array has been used to study γ rays emitted following the spontaneous fission of a 248 Cm source. Analysis of Doppler-broadened lineshapes corresponding to transitions from excited rotational states in neutron-rich Sr, Zr, Mo, Ru and Pd fission fragments has enabled measurements of state lifetimes in these nuclei at nuclear spins of I ∼ 10. Extracted transition quadrupole moments are compared with various recent theoretical approaches, as well as with measurements at lower spin, and an interpretation of the data is made within the context of prolate-oblate shape competition in this region.

show abstract

Section: Experimental Details and Analysis Techniquesmentioning

confidence: 99%

Lifetime measurements and nuclear deformation in theA≈100region

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Finally, the contribution in the feeding of some low-energy transitions that were not observed in the spectra due to internal conversion was approximated by the inclusion of transitions that feed the corresponding emitting levels. For instance, the 13.7-keV transition that is emitted from the 154-keV level of 102 Rh [3] to the isomer in Fig. 1.b was not observed and its contribution was estimated from the 205.1-, 223.6-, and 528.4-keV transitions, and also, the 32.46-keV transition emitted from the 126-keV level of 107 Ag [10] in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…1.b which feed ground state and isomer, respectively. The cross section of the former can be estimated from the experimentally obtained cross section for the 51.27-keV transition emitted from the same level of 102 Rh and using the known relative intensities of the two transitions [3]. Thus, the cross section for the 156.6-keV transition can then be deduced by subtraction from the total cross section obtained for the double peak in the spectra.…”

Section: Resultsmentioning

confidence: 99%

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

et al. 2016

View full text Add to dashboard Cite

Background: In (n, n ′ ) reactions on stable Ir and Au isotopes in the mass A = 190 region the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy up to the neutron energy where the (n, 2n) reaction channel opens up and then decreases.Purpose: In order to check for similar behavior in the mass A = 100 region the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector.Methods: Excited states were studied using the (n, n ′ γ), (n, 2nγ) and (n, 3nγ) reactions on 103 Rh and 109 Ag. A germanium-detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique.Results: Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in 101,102,103 Rh and 107,108,109 Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. Conclusions:The opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A = 190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in 176 Lu with a lower-spin isomer and a higher-spin ground state.PACS numbers: PACS number(s): 25.40.-h, 28.20.-v, 24.10.-i, 25.40.Fq * fotia@lanl.gov 2

show abstract

“…A shape change to large deformation is also evident in the band structure of the odd-mass Pd isotopes [41][42][43][44][45][46][47][48] (Fig. 5) and suggested by B(E2) systematics [21,[55][56][57][58][59]. Yet, Stefanova et al [48] have recently suggested a transition to γ-softness beyond N =61 which may be maximal at 109 Pd 63 and 111 Pd 65 .…”

mentioning

confidence: 76%

New lifetime measurements inPd109and the onset of deformation atN=60

et al. 2015

View full text Add to dashboard Cite

Several new sub-nanosecond lifetimes were measured in 109 Pd using the fast-timing βγγ(t) method. Fission fragments of the A=109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyväskylä Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in 109 Pd populated following β decay of 109 Rh. The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying 7/2 + states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. The available nuclear data indicate a sudden increase in deformation at N =60 which is related to the strong p-n interaction between πg 9/2 and νg 7/2 valence nucleons expected in this region.

show abstract

Nuclear Data Sheets for A = 102

Cited by 128 publications

References 179 publications

Lifetime measurements and nuclear deformation in theA≈100region

Lifetime measurements and nuclear deformation in theA≈100region

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

New lifetime measurements inPd109and the onset of deformation atN=60

Contact Info

Product

Resources

About