Identification of 26-minute Zr-84

1983 ◽  
Vol 61 (4) ◽  
pp. 754-756 ◽  
Author(s):  
Seiichi Shibata ◽  
Paul J. Karol
Keyword(s):  
Cross Sections ◽  
Half Life ◽  
Production Cross ◽  
Isotopic Distribution ◽  
Absolute Abundance ◽  
Spallation Reactions ◽  
Relative Production ◽  
Γ Ray ◽  
The Absolute ◽  
Mev Protons

An unknown γ-ray of energy 112.5 keV was found in zirconium fractions chemically extracted from isotopically enriched molybdenum targets bombarded with 500 and 800 MeV protons. All evidence suggests that the γ-ray is identifiable with the decay of 84Zr to 84Y. A half-life of 25.7 ± 0.5 min was obtained for 84Zr, which is considerably longer than previously reported half-lives. The absolute abundance of the 112.5 keV γ-ray was also determined. Relative production cross sections for 84Zr were calculated using these results and were consistent with the values interpolated from isotopic distribution curves for spallation reactions.

scholarly journals Production Cross-Section Measurements for Terbium Radionuclides of Medical Interest Produced in Tantalum Targets Irradiated by 0.3 to 1.7 GeV Protons and Corresponding Thick Target Yield Calculations

2021 ◽  
Vol 8 ◽  
Author(s):  
Charlotte Duchemin ◽  
Thomas E. Cocolios ◽  
Kristof Dockx ◽  
Gregory J. Farooq-Smith ◽  
Olaf Felden ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Thick Target ◽  
Mass Separation ◽  
High Purity Germanium ◽  
Spallation Reactions ◽  
Target Yield ◽  
Target Production ◽  
Γ Spectrometry ◽  
Medical Interest

This work presents the production cross-sections of Ce, Tb and Dy radionuclides produced by 300 MeV to 1.7 GeV proton-induced spallation reactions in thin tantalum targets as well as the related Thick Target production Yield (TTY) values and ratios. The motivation is to optimise the production of terbium radionuclides for medical applications and to find out at which energy the purity of the collection by mass separation would be highest. For that purpose, activation experiments were performed using the COSY synchrotron at FZ Jülich utilising the stacked-foils technique and γ spectrometry with high-purity germanium detectors. The Al-27(p,x)Na-24 reaction has been used as monitor reaction. All experimental data have been systematically compared with the existing literature.

Dynamics of spallation reactions investigated from production cross sections of residual nuclei in collisions induced by238U at 1 A·GeV on proton and deuterium

2004 ◽  
Vol 734 ◽  
pp. 221-224 ◽  
Author(s):  
J. Pereira ◽  
P. Armbruster ◽  
J. Benlliure ◽  
M. Bernas ◽  
A. Boudard ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Spallation Reactions

L-shell x-ray production cross sections inFe26,Ni28,Cu29,Zn30,Ga31, andGe32by 0.5- to 5.0-MeV protons

1991 ◽  
Vol 44 (7) ◽  
pp. 4372-4378 ◽  
Author(s):  
M. R. McNeir ◽  
Y. C. Yu ◽  
D. L. Weathers ◽  
J. L. Duggan ◽  
F. D. McDaniel ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
X Ray ◽  
Mev Protons

Publisher's Note: Proton production cross sections for reactions by 300- and 392-MeV protons on carbon, aluminum, and niobium [Phys. Rev. C 72, 014606 (2005)]

2005 ◽  
Vol 72 (6) ◽  
Author(s):  
Tadahiro Kin ◽  
Fuminobu Saiho ◽  
Shinya Hohara ◽  
Katsuhiko Ikeda ◽  
Kiyohisa Ichikawa ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Proton Production ◽  
Mev Protons

scholarly journals Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at $$ \sqrt{s} $$ = 7 TeV

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Particle Multiplicity ◽  
Proton Proton ◽  
Proton Collisions ◽  
Relative Production ◽  
The Mean ◽  
Activity Dependence ◽  
Proton Proton Collisions ◽  
Number Of Particles

Abstract The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at $$ \sqrt{s} $$ s = 7 TeV, corresponding to an integrated luminosity of 4.8 fb−1, collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ . For ϒ(nS) mesons with $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ > 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean $$ {p}_{\mathrm{T}}^{\upmu \upmu} $$ p T μμ values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.

Differential Neutron Production Cross Sections For 590 Mev Protons

1983 ◽  
pp. 383-386
Author(s):  
S. Cierjacks ◽  
Y. Hino ◽  
S. D. Howe ◽  
F. Raupp ◽  
L. Buth
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Neutron Production ◽  
Mev Protons

OBSERVATION OF INTERFERENCE BETWEEN ATOMIC BREMSSTRAHLUNG AND NUCLEAR BREMSSTRAHLUNG

1999 ◽  
Vol 09 (01n02) ◽  
pp. 1-10 ◽  
Author(s):  
K. ISHII ◽  
T. SATOH ◽  
S. MATSUYAMA ◽  
H. YAMAZAKI ◽  
Y. TOKAI ◽  
...  
Keyword(s):  
Cross Sections ◽  
Energy Region ◽  
Production Cross ◽  
Angular Distributions ◽  
X Rays ◽  
Beam Direction ◽  
Aluminum Target ◽  
X Ray ◽  
Wide Range ◽  
Mev Protons

An aluminum target was bombarded with 1.5 MeV protons and continuous x-rays were measured at the angles of 45°, 90° and 135° with respect to the beam direction. By investigating the shape of the x-ray energy spectrum, it was recognized that, the continuous x-rays below 12 keV are atomic bremsstrahlung (AB) and those of above 12 keV are nuclear bremsstrahlung (NB), and AB and NB are mingled in the energy region of around 12 keV The x-ray energy dependence of angular distributions presented well a change from the process of AB to that of NB in the continuous x-ray spectrum. Interference between AB and NB were discussed on the basis of PWBA theory. Continuous x-ray production cross sections were calculated on the basis of PWBA BEA and a semi-classical theory and compared with the experimental results. The theoretical prediction reproduced well the experimental cross sections over the wide range of 6 orders in magnitude and of 2 keV – 35 keV in the energy except for the energy region mingled with AB and NB. The ratio of the theoretical cross sections to the experimental ones showed an interference effect between AB and NB in their mingled region.

Nuclide production cross sections from irradiation of thorium by 438 MeV protons and a comparison to fluka and geant4 simulations

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Andrew K. H. Robertson ◽  
Peter Kunz ◽  
Cornelia Hoehr ◽  
Paul Schaffer
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Mev Protons

scholarly journals Measurement of $$W^\pm $$ boson production in Pb+Pb collisions at $$\sqrt{s_{\mathrm{NN}}} = 5.02~\text {Te}\text {V}$$ with the ATLAS detector

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Cross Sections ◽  
Parton Distribution ◽  
Production Cross ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Production ◽  
Parton Distribution Functions ◽  
Absolute Value ◽  
The Absolute ◽  
Thickness Function

AbstractA measurement of $$W^\pm $$W± boson production in Pb+Pb collisions at $$\sqrt{s_\mathrm {NN}} = 5.02~\text {Te}\text {V}$$sNN=5.02Te is reported using data recorded by the ATLAS experiment at the LHC in 2015, corresponding to a total integrated luminosity of $$0.49\;\mathrm {nb^{-1}}$$0.49nb-1. The $$W^\pm $$W± bosons are reconstructed in the electron or muon leptonic decay channels. Production yields of leptonically decaying $$W^\pm $$W± bosons, normalised by the total number of minimum-bias events and the nuclear thickness function, are measured within a fiducial region defined by the detector acceptance and the main kinematic requirements. These normalised yields are measured separately for $$W^+$$W+ and $$W^-$$W- bosons, and are presented as a function of the absolute value of pseudorapidity of the charged lepton and of the collision centrality. The lepton charge asymmetry is also measured as a function of the absolute value of lepton pseudorapidity. In addition, nuclear modification factors are calculated using the $$W^\pm $$W± boson production cross-sections measured in pp collisions. The results are compared with predictions based on next-to-leading-order calculations with CT14 parton distribution functions as well as with predictions obtained with the EPPS16 and nCTEQ15 nuclear parton distribution functions. No dependence of normalised production yields on centrality and a good agreement with predictions are observed for mid-central and central collisions. For peripheral collisions, the data agree with predictions within 1.7 (0.9) standard deviations for $$W^-$$W- ($$W^+$$W+) bosons.

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