Nuclear Data Sheets for A = 99

Browne, E.; Tuli, J.K.

doi:10.1016/j.nds.2017.09.002

Cited by 46 publications

(25 citation statements)

References 390 publications

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“…The lifetime of the 121.7-keV level has been reported to be measured several times [31] and, therefore, constitutes a good test case. Furthermore several lifetimes measured from this data set have been reported previously [32][33][34].…”

Section: Resultsmentioning

confidence: 99%

“…While for the lower-energy states the agreement is good, for the 850-keV 7/2 + state it is worse, especially its E 2 branch towards the 576-keV 3/2 + state is predicted less collective, with a B(E 2) value 3-4 times smaller than the experimental value. The decay pattern of the 1323-keV 9/2 + state towards the 850-keV 7/2 + and 1066-keV 9/2 + states [31] also could not be well reproduced (therefore, these states are only tentatively associated with calculated ones). It appears that the connection between the two level structures [band (A, a) and the band based on the 576-keV 3/2 + state[ cannot be well described by this simple model (in terms of these calculations, one would need a TABLE V. Level energies E i , transition energies E γ , and experimental and theoretical reduced transition rates for states of 99 Zr relevant to the present work.…”

Section: Ibfm-1mentioning

confidence: 91%

“…For the M1 transitions we used the simplest transfer operator, with gyromagnetic ratios g d = 0.4μ N for the d-boson g factor, and g s = −2.68μ N for the fermion, which is 70% of the free neutron value to account for core polarization effects, and a value g l = 0 (the odd nucleon is a neutron). highlights some differences between the ENSDF adopted level scheme [31] and the spin assignments of Ref. [18] (see also Fig.…”

Section: Ibfm-1mentioning

confidence: 99%

“…A thorough description of this method is presented in Refs. [33,34] Transition branching ratios from [31] and corrections for internal conversion [37] were used to convert the measured level lifetimes into partial stretched E 2 lifetimes (τ E 2 ). Reduced transition rates were then calculated using the formula…”

Section: -mentioning

confidence: 99%

“…The 381-keV transition was rejected in the evaluation by [31] as it is inconsistent with the adopted J π = 3/2 + assigned to the 657.9-keV level. Figure 8 shows a coincident γ -ray spectrum.…”

Section: 7-kev Level Was Not Reportedmentioning

confidence: 99%

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Lifetimes and shape-coexisting states of Zr99

Spagnoletti¹,

Simpson²,

Kisyov³

et al. 2019

Phys. Rev. C

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Lifetimes of intermediate-spin states in two rotational bands of 99 Zr have been measured. These states were populated following the neutron-induced fission of 235 U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99 Zr 59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E 2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β 2 = 0.34(1) and 0.26(3) to be determined for the 821.6-and 1236.6-keV members, whereas β 2 = 0.32(3) was found for the 850.5-keV member of the ν3/2 [411] band. Some of the excited states known in 99 Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99 Zr.

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Section: Resultsmentioning

confidence: 99%

Section: Ibfm-1mentioning

confidence: 91%

Section: Ibfm-1mentioning

confidence: 99%

Section: -mentioning

confidence: 99%

Section: 7-kev Level Was Not Reportedmentioning

confidence: 99%

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Lifetimes and shape-coexisting states of Zr99

Spagnoletti¹,

Simpson²,

Kisyov³

et al. 2019

Phys. Rev. C

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Technical Note: DoseMapper: A validated GUI‐based exact numerical modeling method of shielding in PET/CT facilities

2017

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Monte Carlo calculated calibration settings for commercially available nuclear medicine ionization chambers

2022

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Purpose A method for calculating nuclear medicine ionization chamber (NMIC) calibration settings with a Monte Carlo model is presented and validated against physical measurements. This work provides Monte Carlo–calculated calibration settings for select isotopes with no current manufacturer recommendations and a method by which NMIC manufacturers or standards laboratories can utilize highly detailed specifications to calculate comprehensive lists of calibration settings for general isotopes. Methods A Monte Carlo model of a Capintec PET series NMIC was developed and used to calculate the chamber response to relevant radioactive decay products over an energy range relevant to nuclear medicine. The photon detection efficiency (PDE) of a high purity germanium (HPGe) detector was modeled and physically validated to facilitate measurements of NMIC calibration settings with HPGe detector spectroscopy. Modeled NMIC response to various isotopes was compared against spectroscopic measurements and National Institute of Standards and Technology (NIST)‐validated calibration settings to validate the Monte Carlo–calculated NMIC calibration settings. Results HPGe detector PDE was validated against the physical measurements to within 3.3%$3.3\%$ at 95%$95\%$ confidence and used to measure calibration settings, which produced activity readings 0.7%$0.7\%$, 1.6%$1.6\%$, 0.8%$0.8\%$, and 1.0%$1.0\%$ different than those validated by NIST for 11$^{11}$C, 18$^{18}$F, 68$^{68}$Ga, and 64$^{64}$Cu respectively. The Monte Carlo model of the NMIC reproduced measured calibration settings to within 7%$7\%$ at 95%$95\%$ confidence for isotopes with a sufficiently small yield of low energy photons. Conclusions A method of calculating NMIC calibration settings with Monte Carlo modeling has been developed and validated against HPGe detector spectroscopy. NMIC manufacturers or standards laboratories can use more detailed specifications of the chamber geometries to extend the applicability of this method to a wider range of isotopes.

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Nuclear Data Sheets for A = 99

Cited by 46 publications

References 390 publications

Lifetimes and shape-coexisting states of Zr99

Lifetimes and shape-coexisting states of Zr99

Technical Note: DoseMapper: A validated GUI‐based exact numerical modeling method of shielding in PET/CT facilities

Monte Carlo calculated calibration settings for commercially available nuclear medicine ionization chambers

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