Study of 138La radioactive decays using LaBr3 scintillators

Quarati, F.; Khodyuk, I. V.; Eijk, C.W.E. van; Quarati, Piero; Dorenbos, P.

doi:10.1016/j.nima.2012.04.066

Cited by 82 publications

(72 citation statements)

References 20 publications

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“…The values of the K and L X-rays are 35.5 and 4.5 keV respectively, as detected with the LaBr 3 (Ce) detector [7]. It should be noted that the actual energies of the K and L shells of Ba are 37.44 and 5.6 keV respectively, however, because of the non-proportional response at low energies in LaBr 3 :Ce [8] these energies are quenched to lower values.…”

Section: A Self-activity From 138 Lamentioning

confidence: 87%

“…The peak centered at 1440 keV is the summation of the 1436 γ-ray and the L X-ray at 4.5 keV while the peak centered at 1472 keV is the summation of the 1436 γ-ray and the K Xray at 35.5 keV. The small peak at 1461 keV is attributed to the 40 K [7].…”

Section: A Self-activity From 138 Lamentioning

confidence: 97%

“…There are two decay modes of 138 La, electron capture to 138 Ba with a probability of 66.4% and β-decay to 138 Ce with a probability of 33.4% [7]. In both decay modes the 138 La decays to an excited state of the daughter nuclei.…”

Section: A Self-activity From 138 Lamentioning

confidence: 99%

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Wide range automatic energy calibration of LaBr<inf>3</inf>:Ce detectors by the self-activity lines

Omer

Negm

Zen

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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A real-time automatic energy calibration (RAEC) algorithm of a LaBr 3 :Ce scintillation detector array has been developed. The energy markers for this calibration are the selfactivity lines inherently existing inside the LaBr 3 crystal. Five energy markers were used in this technique. Two lines are from the radioactive isotope of lanthanum, 138 La, at 789 and 1436 keV while the other three are from the 227 Ac which is thought to be the source of the self-activity of LaBr 3 detectors near 2 MeV energy range. The energy calibration extracted from RAEC algorithm is evaluated by a comparison with the energy calibration that was established using 56 Co radioactive checking source. The two energy calibrations showed a good agreement, indicating a high potential to use the self-energy calibration technique for LaBr 3 :Ce detectors. L 978-1-4799-0534-8/13/$31.00 ©2013 IEEE

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Section: A Self-activity From 138 Lamentioning

confidence: 87%

Section: A Self-activity From 138 Lamentioning

confidence: 97%

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Wide range automatic energy calibration of LaBr<inf>3</inf>:Ce detectors by the self-activity lines

Omer

Negm

Zen

et al. 2013

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

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“…Spectrometer (AMS) (Alcaraz et al, 2000), CDGR and the Earth gamma-ray albedo spectra measured by Swift/BAT and CGRO/EGRET instruments (Ajello et al, 2008;Perty, 2005), calculated spectra of the Earth neutron albedo represented in Drozdov et al (2010) were used. We also used LaBr 3 (Ce) intrinsic activity spectrum for the LES detector background estimation (Quarati et al, 2012).…”

Section: Response Simulationmentioning

confidence: 99%

Solar gamma-ray spectrometer GRIS onboard the International Space Station

Yurov

Trofimov

Lupar

et al. 2015

Advances in Space Research

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“…Despite these interesting features, however, the presence of a radioactive isotope of lanthanum, which can undergo both beta decay and electron capture, adds the drawback of having some intrinsic activity and, thus, of subtracting 138 La emission background from measured spectra. [17] However, the theoretical foundations of this emission affecting the performances of these detectors are still largely debated. To show that our many-body relativistic approach has the potential to interpret even this type of experiments, we simulate the electron capture of 138 La 3+ , having the electronic structure realistically similar to lanthanum in LaBr 3 crystals.…”

Section: Introductionmentioning

confidence: 99%

Relativistic Theory and Ab Initio Simulations of Electroweak Decay Spectra in Medium‐Heavy Nuclei and of Atomic and Molecular Electronic Structure

Morresi

Taioli

Simonucci

2018

Advcd Theory and Sims

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In this work a novel theoretical and computational method for computing electroweak beta decay spectra of medium and heavy-mass nuclei, as well as the electronic structure of atomic and molecular systems is developed. In particular, starting from the phenomenological electroweak interaction of the Standard Model (SM) of particles, a general expression of the beta decay rate was derived. Relativistic effects are taken into account by solving the many-electron Dirac equation from first-principles. Furthermore, an extension of this approach to include the nucleon-nucleon interaction at the same level of theory of the electronic correlations has been devised. It is shown that post-collisional effects, and to a lesser extent the electronic exchange and correlation, can modify significantly the cross-section only at low energies (<10 keV), while nuclear correlations considerably affect the lineshape of both the absorption and emission spectra particularly in odd-odd nuclear transitions, where the independent particle approximation, on which the nuclear shell model is framed, is more likely to fail. These findings demonstrate the importance of moving beyond the independent particle picture to obtain an accurate description of the experimental data by adding the many-body correlations between the spectator and participator hadrons and leptons involved in the decay. The application of our approach to a number of test cases, such as the modeling of beta decay of 36 Cl, 63 Ni, 129 I, 210 Bi, 241 Pu and of the electron capture of 138 La 3+ , leads to an extremely good agreement with the relevant experimental data. Finally, the extension of this method to atomic and molecular systems by calculating the electronic structures of 138 La 3+ and several isomers (MgCN, MgNC) and molecules (HMgCN, MgCNO, and BrCF 3 ) relevant to astrophysical scenarios is presented. This method, which is capable to deal with both nucleonic and electronic degrees of freedom, has far-reaching implications also in neutrino physics and nuclear astrophysics. 1800086 (23 of 24) www.advancedsciencenews.com www.advtheorysimul.com Keywords Dirac equation, electronic structure simulations, nuclear beta decay, nuclear many-body effects, standard model Hamiltonian

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Study of 138La radioactive decays using LaBr3 scintillators

Cited by 82 publications

References 20 publications

Wide range automatic energy calibration of LaBr<inf>3</inf>:Ce detectors by the self-activity lines

Wide range automatic energy calibration of LaBr<inf>3</inf>:Ce detectors by the self-activity lines

Solar gamma-ray spectrometer GRIS onboard the International Space Station

Relativistic Theory and Ab Initio Simulations of Electroweak Decay Spectra in Medium‐Heavy Nuclei and of Atomic and Molecular Electronic Structure

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