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Journal articles on the topic 'Gamma rays'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Musser, George. "Gamma Rays." Scientific American 301, no. 3 (2009): 94. http://dx.doi.org/10.1038/scientificamerican0909-94b.

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2

Sun, Y. K., H. T. Jing, B. B. Tian, X. L. Gao, and X. Y. Yang. "Research on proton beam spot imaging based on pixelated gamma detector." Journal of Instrumentation 17, no. 02 (2022): P02033. http://dx.doi.org/10.1088/1748-0221/17/02/p02033.

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Abstract The secondary particles from the spallation target of the China Spallation Neutron Source are mainly gammas and neutrons, which are related to the incident proton. The reconstruction of the proton beam spot could be implemented based on the distribution of the positions of secondary gammas or neutrons. The methods of pinhole imaging and Compton imaging are developed by measuring the position distribution of gammas based on the pixelated detector. The secondary gammas could be detected by the pixelated gamma detector directly. The neutron can be identified by detecting the characterist

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3

Chi, X., and A. W. Wolfendale. "Extragalactic gamma rays." Journal of Physics G: Nuclear and Particle Physics 15, no. 9 (1989): 1509–18. http://dx.doi.org/10.1088/0954-3899/15/9/019.

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4

Zarifmahmoudi, Leili, and Ramin Sadeghi. "Scattered gamma rays." Nuclear Medicine Communications 36, no. 7 (2015): 755–56. http://dx.doi.org/10.1097/mnm.0000000000000324.

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5

Danilyan, G. V., J. Klenke, V. A. Krakhotin, et al. "Scission gamma rays." Physics of Atomic Nuclei 72, no. 11 (2009): 1812–17. http://dx.doi.org/10.1134/s1063778809110027.

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6

May, M. "Hypernuclear gamma rays." Nuclear Physics A 450 (March 1986): 179–88. http://dx.doi.org/10.1016/0375-9474(86)90552-x.

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7

Kasztelan, M., K. Jȩdrzejczak, and J. Szabelski. "Comparison of MC Geant4 simulation with the measurements of gamma photons produced by neutrons." Modern Physics Letters A 34, no. 06 (2019): 1950046. http://dx.doi.org/10.1142/s0217732319500469.

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In this work, we have focused on results of measurements of the hydrogen line 2223 keV and compared them with the results of Geant4 simulations. The paraffin containing hydrogen was irradiated by neutrons produced by the weak AmBe source. Produced gammas were measured with the germanium detector. The experimental setup was placed inside a carbon chamber which provided the shielding from the external neutrons. The measurements were performed for different amounts of paraffin. The processes playing a role in the description of our measurements are transport and moderation of neutrons, production

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8

Koshikawa, N., A. Omata, M. Masubuchi, et al. "Activation imaging of drugs with hybrid Compton camera: A proof-of-concept study." Applied Physics Letters 121, no. 19 (2022): 193701. http://dx.doi.org/10.1063/5.0116570.

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The visualization of drugs is essential for cancer treatment. Although several methods for visualizing drugs have been proposed, a versatile method that can be easily applied to various drugs has not yet been established. Therefore, we propose “activation imaging,” in which a drug is irradiated with thermal neutrons and becomes radioactive, enabling visualization using emitted x rays and/or gamma rays. Activation imaging does not require the conjugation of specific tracers with drugs. Therefore, it can be easily applied to a variety of drugs, drug carriers (e.g., metal nanoparticles), and cont

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9

López, J. A., S. S. Romero González, O. Hernández Rodríguez, J. Holmes, and R. Alarcon. "GEANT4 Study of Proton–Body Interactions." Journal of Nuclear Physics, Material Sciences, Radiation and Applications 8, no. 2 (2021): 121–27. http://dx.doi.org/10.15415/jnp.2021.82015.

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Proton therapy uses a beam of protons to destroy cancer cells. A problem of the method is the determination of what part of the body the protons are hitting during the irradiation. In a previous study we determine that by capturing the gamma rays produced during the irradiation one can determine the location of the proton-body interaction, in this work we investigate if by examining the gamma rays produced it is possible to determine the body part that produced the gamma rays by the proton collision. This study uses GEANT4 computer simulations of interactions of proton-tissue, protonbrain, pro

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10

Zuo, Yinghong, Maoyu Zhang, Guoxin Cheng, and Shengli Niu. "Study on Induced Current of Iron Plate Irradiated by Pulsed Gamma Rays." E3S Web of Conferences 53 (2018): 01007. http://dx.doi.org/10.1051/e3sconf/20185301007.

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To obtain the transient current response law of the metal component irradiated by pulsed gamma rays, the pulsed gamma ray irradiation experiment of the iron plate was carried out on “Qiangguang-I” accelerator. The transient current of iron plate generated by pulsed gamma rays was measured and analysed, and the relationship between the amplitude of pulse current and the dose rate of gamma rays was obtained. The results show that the current response sensitivity of the iron plate is about 5.7×10-7(A/m2)/(Gy/s) when the gamma rays with the energy of 0.8 MeV irradiate the iron plate. The charge de

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11

Song, Ruiqiang, Shuo Peng, Yufeng Tong, et al. "The Neutron-Gamma Pulse Shape Discrimination of CLLB Detector." EPJ Web of Conferences 295 (2024): 09031. http://dx.doi.org/10.1051/epjconf/202429509031.

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Cs2LiLaBr6: Ce (CLLB) scintillator with the size of Φ 21mm × 25 mm coupled with PMT was used to detect neutron and gamma rays. The pulse shape discrimination (PSD) of neutrons and gamma rays by charge comparison method, the neutrons and gamma rays from AmBe source and fast neutron beam can be separated with figure-of-merit (FOM) values of 0.9 and 1.3, respectively. However, some neutron and gamma rays are difficult to distinguish, so new algorithms need to be investigated to improve the PSD performance of neutron and gamma. Artificial neural networks (ANN) have a very good image recognition ca

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12

Alfaro, R., C. Alvarez, J. C. Arteaga-Velázquez, et al. "Search for Joint Multimessenger Signals from Potential Galactic Cosmic-Ray Accelerators with HAWC and IceCube." Astrophysical Journal 976, no. 1 (2024): 8. http://dx.doi.org/10.3847/1538-4357/ad812f.

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Abstract The origin of high-energy galactic cosmic rays is yet to be understood, but some galactic cosmic-ray accelerators can accelerate cosmic rays up to PeV energies. The high-energy cosmic rays are expected to interact with the surrounding material or radiation, resulting in the production of gamma-rays and neutrinos. To optimize for the detection of such associated production of gamma-rays and neutrinos for a given source morphology and spectrum, a multimessenger analysis that combines gamma-rays and neutrinos is required. In this study, we use the Multi-Mission Maximum Likelihood framewo

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13

Bharathi, T., S. Gnanamurthy, D. Dhanavel, and M. Ariraman. "Induced Physical Mutagenesis and its Effect in Cytological Behavior of Ashwagandha (Withania somnifera (L.) Dunal)." International Letters of Natural Sciences 17 (June 2014): 152–61. http://dx.doi.org/10.18052/www.scipress.com/ilns.17.152.

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The mitotic effect of physical mutagen gamma rays was observed in the root tip cells of Ashwagandha. The Chromosome analysis has been showed as an important tool for establish variability of the plant seed by use of physical mutagen gamma rays. The gamma rays have of low wavelength and high penetrable power. The plant has tremendous medicinal values and it is known from ancient times. The dry and well matured seeds of ashwagandha were irradiated with different doses of gamma rays viz., 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 KR respectively. The chromosome number of control plant is 2n = 48.

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14

Bharathi, T., S. Gnanamurthy, D. Dhanavel, and M. Ariraman. "Induced Physical Mutagenesis and its Effect in Cytological Behavior of Ashwagandha (<i>Withania somnifera</i> (L.) Dunal)." International Letters of Natural Sciences 17 (June 30, 2014): 152–61. http://dx.doi.org/10.56431/p-44g1js.

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The mitotic effect of physical mutagen gamma rays was observed in the root tip cells of Ashwagandha. The Chromosome analysis has been showed as an important tool for establish variability of the plant seed by use of physical mutagen gamma rays. The gamma rays have of low wavelength and high penetrable power. The plant has tremendous medicinal values and it is known from ancient times. The dry and well matured seeds of ashwagandha were irradiated with different doses of gamma rays viz., 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 KR respectively. The chromosome number of control plant is 2n = 48.

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15

Huang, Tian-Qi, and Zhuo Li. "Constraints on Hadronic Contributions to LHAASO Sources with Neutrino Observations." Astrophysical Journal 925, no. 1 (2022): 85. http://dx.doi.org/10.3847/1538-4357/ac423d.

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Abstract The Large High Altitude Air Shower Observatory (LHAASO) detected 12 gamma-ray sources above 100 TeV, which are the possible origins of Galactic cosmic-rays. We summarize the neutrino measurements by IceCube and ANTARES in the vicinity of LHAASO sources to constrain the contribution of hadronic gamma-rays in these sources. We find that the current observations constrain hadronic gamma-rays to contribute no more than ∼60% of the gamma-rays from the Crab Nebula. Gamma-rays from two LHAASO sources, LHAASO J1825−1326 and LHAASO J1907+0626, are dominated by leptonic components up to ∼200 Te

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16

Osborne, J. L., A. W. Wolfendale, and L. Zhang. "Soft X-rays and cosmic gamma-rays." Monthly Notices of the Royal Astronomical Society 276, no. 2 (1995): 409–16. http://dx.doi.org/10.1093/mnras/276.2.409.

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17

Leising, Mark D. "Gamma-rays and X-rays from SN1987A." Nature 332, no. 6164 (1988): 516–18. http://dx.doi.org/10.1038/332516a0.

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18

Gan, Weiqun, Jin Chang, Youping Li, and Chunmei Lin. "Solar hard X-rays and gamma-rays." Science in China Series A: Mathematics 45, S1 (2002): 30–35. http://dx.doi.org/10.1007/bf02889681.

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19

Alhamd, M. W., Sadeq Naeem Atiyah, Firas Taqi Almusawi, and Mazen Katea Al-Gharrawy. "Gamma Ray Spectrum by Software Methods for Radioactive Waste." Iraqi Journal of Industrial Research 10, no. 3 (2023): 41–46. http://dx.doi.org/10.53523/ijoirvol10i3id323.

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The requirements of NTD (Neglected Tropical Diseases) and technological regulations for the operation of NPP (Nuclear Power Plant) power units (NP-001-97 (OPB-88/97), NP-082-07) define the requirements for monitoring the specific activity of iodine-131 (the amount of iodine) in the NPP primary circuit coolants. The advantages of laboratory control include accuracy of measurement and the radionuclide composition of the primary coolant, measured using high-precision laboratory equipment. Instrumental spectra were obtained for the detection units BDKG-205m with various options for the placement o

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20

Eichler, David. "Particle Acceleration in High-Energy Gamma-Ray Sources." International Astronomical Union Colloquium 142 (1994): 877–81. http://dx.doi.org/10.1017/s0252921100078246.

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AbstractMany proficient gamma-ray sources show energy spectra that are consistent with E−2 primary spectra. Such sources include recently identified gamma-ray quasars and some gamma-ray bursts. Assuming thick target conversion, this is consistent with shock acceleration, and the dominance of the gamma rays of the luminosity is also consistent with previous predictions of high production efficiency of fresh cosmic rays in shocks. The spectral cutoffs in the gamma rays may offer clues as to whether the high-energy particles are electrons or protons. Resolution of this matter might have implicati

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21

Allison, Ron, and James P. Vaughan. "Gamma Rays Combat Restenosis." Science News 152, no. 15 (1997): 235. http://dx.doi.org/10.2307/3981104.

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22

Pockley, Peter. "Gamma rays down under." Physics World 13, no. 5 (2000): 7. http://dx.doi.org/10.1088/2058-7058/13/5/8.

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23

Frahm, Ronald. "Science with Gamma Rays." Synchrotron Radiation News 22, no. 3 (2009): 2. http://dx.doi.org/10.1080/08940880902959726.

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24

SHAHAM, JACOB. "Galactic halo gamma rays." Nature 354, no. 6353 (1991): 439. http://dx.doi.org/10.1038/354439a0.

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25

Benka, Stephen G. "Gamma rays from thunderclouds." Physics Today 60, no. 10 (2007): 26. http://dx.doi.org/10.1063/1.4797447.

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26

Shvets, Gennady. "Gamma-rays going cheap." Nature Physics 7, no. 11 (2011): 834–35. http://dx.doi.org/10.1038/nphys2110.

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27

Mukherjee, R. "High energy gamma rays." Nuclear Physics B - Proceedings Supplements 91, no. 1-3 (2001): 480–86. http://dx.doi.org/10.1016/s0920-5632(00)00978-6.

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28

WALDROP, M. M. "Gamma Rays for Christmas." Science 239, no. 4835 (1988): 26. http://dx.doi.org/10.1126/science.239.4835.26.

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29

Leising, M. D. "Focusing supernova gamma rays." Experimental Astronomy 20, no. 1-3 (2006): 49–55. http://dx.doi.org/10.1007/s10686-006-9052-3.

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30

R., A. Satpute and *Suradkar S. W. "GENETIC ENHANCMENT OF GROUNDNUT (ARACHIS HYPOGAEA L.)THROUGH INDUCED MUIATION." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 04 (2018): 3192–96. https://doi.org/10.5281/zenodo.1239779.

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Groundnut (Arachis hypogaea L.) is a member of family Fabaceae grown for oilseed, food and animal feed. Groundnut contains 51% of monosaturated oil and 30% polyunsaturated and 19% saturated oil. India consumes over 10 million tonnes of edible oil per year. Present study was conducted for genetic enhancement of groundnut thorough induced mutation by gamma rays and EMS. For the purpose oil percentage, saponification, Iodine value and Protein percentage was observed after the different doses of gamma rays and EMS on two varieties of groundnut viz. TAG-24 and AK-159 and it was concluded that 10 kr

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31

Trubnikov, B. A. "Cosmic rays and gamma-ray bursts." Uspekhi Fizicheskih Nauk 167, no. 3 (1997): 345. http://dx.doi.org/10.3367/ufnr.0167.199703k.0345.

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32

Naqvi, A. A., F. Z. Khiari, F. A. Liadi, Khateeb ur-Rehman, M. Raashid, and A. A. Isab. "Multiple Gamma-Ray Detection Capability of a CeBr3 Detector for Gamma Spectroscopy." Journal of Spectroscopy 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/5634384.

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The newly developed cerium tribromide (CeBr3) detector has reduced intrinsic gamma-ray activity with gamma energy restricted to 1400–2200 keV energy range. This narrower region of background gamma rays allows the CeBr3 detector to detect more than one gamma ray to analyze the gamma-ray spectrum. Use of multiple gamma-ray intensities in elemental analysis instead of a single one improves the accuracy of the estimated results. Multigamma-ray detection capability of a cylindrical 75 mm × 75 mm (diameter × height) CeBr3 detector has been tested by analyzing the chlorine concentration in water samp

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33

Sei, Norihiro, Hiroshi Ogawa, and QiKa Jia. "Multiple-Collision Free-Electron Laser Compton Backscattering for a High-Yield Gamma-Ray Source." Applied Sciences 10, no. 4 (2020): 1418. http://dx.doi.org/10.3390/app10041418.

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We observed multiple-collision free-electron laser (FEL)-Compton backscattering in which a multi-bunch electron beam makes head-on collisions with multi-pulse FELs in an optical cavity, using an infrared FEL system in the storage ring NIJI-IV. It was demonstrated that the measured spectrum of the multiple-collision FEL-Compton backscattering gamma rays was the summation of the spectra of the gamma rays generated at each collision point. Moreover, it was demonstrated that the spatial distribution of the multiple-collision FEL-Compton backscattering gamma rays was the summation of those of the g

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34

Casanova, Sabrina. "On the Search for the Galactic PeVatrons by Means of Gamma-Ray Astronomy." Universe 8, no. 10 (2022): 505. http://dx.doi.org/10.3390/universe8100505.

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Cosmic rays are ultra-relativistic particles that slam into the atmosphere from all directions in the sky. Gamma rays emitted when cosmic rays interact with Galactic gas and radiation fields are a powerful tool to investigate their origin. Many candidate CR sources have been discovered in GeV-to-PeV gamma rays. However, the major contributors to the CR population, especially at the highest energies, are still unknown. We give here a state of the art report on the search for the sources of Galactic cosmic rays by means of gamma-ray astronomical methods.

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35

U C, KAR, and SWAIN D. "Induced chlorophyll and macro-mutational spectrum and frequency in sesame cv.B 67." Madras Agricultural Journal 90, December (2003): 625–32. http://dx.doi.org/10.29321/maj.10.a00149.

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Seed treatment of sesame cv.B67, with EMS, NG, Gamma rays, Gamma rays EMS and Gamma rays+ NG induced five types of chlorophyll mutations and 17 types of viable macro-mutations in M,. Chlorophyll mutation frequency was the highest in 900 Gy gamma rays for single mutagen treatments and in 700 Gy + 0.04% NG for combined treatments. Macro-mutational frequencies for single and combined treatments were the highest in 0.25% EMS and 700 Gy 0.02% NG, respectively. Relative difference in mutability of gene loci for chlorophyll and macro-mutations with respect to different mutagens were clearly observed.

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36

McLaughlin, Maura, and James Cordes. "Gamma Ray Pulsar Luminosities." International Astronomical Union Colloquium 177 (2000): 359–62. http://dx.doi.org/10.1017/s0252921100059996.

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AbstractWe apply a likelihood analysis to pulsar detections, pulsar upper limits, and diffuse background measurements from the OSSE and EGRET instruments to constrain theγ-rays pulsar luminosity law. We find a steeper dependence on period and magnetic field at OSSE than at EGRET energies. We also find that pulsars may be an important component of the OSSE diffuse flux, but are most likely not important for EGRET. We estimate that as many as half of the unidentified EGRET sources may beγ-rays pulsars. Furthermore, we predict that GLAST will detect roughly 1000γ-rays pulsars, only 100 of which a

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37

Bhusari, Arjun V., Mangesh R. Deshmukh, and Surdesh R. Bhagat. "EFFECT OF GAMMA IRRADIATION ON MORPHOLOGICAL CHARACTERS OF MARIGOLD (Tagetes erecta L.)." World Journal of Biology and Biotechnology 2, no. 3 (2017): 165. http://dx.doi.org/10.33865/wjb.002.03.0109.

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Seeds of marigold cv. ‘Pusa Narangi Gainda’ were treated with different gamma irradiation treatments viz, control, 25 Gy, 50 Gy, 75 Gy, 100 Gy, 125 Gy and 150 Gy and evaluated for various morphological characters. Reduction in survival percentage, plant height, number of branches and plant spread was observed after irradiation and with increase in exposure of gamma rays. Early flower bud initiation and flower opening was observed in lower dose of gamma rays. Flower diameter, number of flowers and length of peduncle was significantly highest at the lowest dose of gamma irradiation. The stimulat

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38

Dai, Ben-Zhong, and Li Zhang. "Gamma-Ray-Bright Blazars: The Spectral Properties in X-Rays and Gamma-Rays." Publications of the Astronomical Society of Japan 55, no. 5 (2003): 939–45. http://dx.doi.org/10.1093/pasj/55.5.939.

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39

Cheung, W. M., and K. S. Cheng. "Unpulsed High-Energy Radiation from the Crab Pulsar and Nebula." International Astronomical Union Colloquium 142 (1994): 827–31. http://dx.doi.org/10.1017/s0252921100078167.

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AbstractGenerally, people believe that the unpulsed high-energy gamma rays from the direction of Crab Nebula and pulsar comes from the nebula. But it is entirely possible that the unpulsed high-energy gamma rays from the direction of the Crab Nebula and pulsar are actually emitted from a region extending to a couple of light cylinder radii from the pulsar instead of from the extensive nebula. In this conference paper, we study the possibility that the unpulsed high-energy gamma rays from 100 MeV to 10 GeV are emitted from the extensive nebula. In our model, two pulsed photon beams from two dif

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40

GHISELLINI, GABRIELE. "EXTRAGALACTIC GAMMA-RAYS: GAMMA RAY BURSTS AND BLAZARS." International Journal of Modern Physics A 20, no. 29 (2005): 6991–7000. http://dx.doi.org/10.1142/s0217751x05030673.

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The extragalactic gamma-ray sky is dominated by two classes of sources: Gamma-Ray Bursts (GRBs) and radio loud active galactic nuclei whose jets are pointing at us (blazars). We believe that the radiation we receive from them originates from the transformation of bulk relativistic energy into random energy. Although the mechanisms to produce, collimate and accelerate the jets in these sources are uncertain, it is fruitful to compare the characteristics of both classes of sources in search of enlightening similarities. I will review some general characteristics of radio loud AGNs and GRBs and I

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41

Dermer, C. D., and G. Powale. "Gamma rays from cosmic rays in supernova remnants." Astronomy & Astrophysics 553 (April 26, 2013): A34. http://dx.doi.org/10.1051/0004-6361/201220394.

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42

Feder, Toni. "Duke Beams Hard Gamma Rays, Soft X Rays." Physics Today 55, no. 12 (2002): 26–27. http://dx.doi.org/10.1063/1.1537901.

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43

Kane, P. P. "Elastic scattering of gamma rays and X-rays." Radiation Physics and Chemistry 74, no. 6 (2005): 402–10. http://dx.doi.org/10.1016/j.radphyschem.2005.08.004.

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44

Kane, P. P. "Inelastic scattering of X-rays and gamma rays." Radiation Physics and Chemistry 75, no. 12 (2006): 2195–205. http://dx.doi.org/10.1016/j.radphyschem.2006.08.001.

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45

WACHTER, KERRI. "X-rays, Gamma Rays Added to Carcinogen List." Ob.Gyn. News 40, no. 6 (2005): 17. http://dx.doi.org/10.1016/s0029-7437(05)70093-8.

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46

Van Der Walt, D. J., and A. W. Wolfendale. "Gamma rays and the origin of cosmic rays." Space Science Reviews 47, no. 1-2 (1988): 1–45. http://dx.doi.org/10.1007/bf00223236.

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47

Szabelski, J., D. J. van der Walt, J. Wdowczyk, and A. W. Wolfendale. "Gamma rays and the origin of cosmic rays." Advances in Space Research 9, no. 12 (1989): 129–41. http://dx.doi.org/10.1016/0273-1177(89)90320-7.

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48

WACHTER, KERRI. "X-rays, Gamma Rays Added to Carcinogen List." Rheumatology News 4, no. 3 (2005): 4. https://doi.org/10.1016/s1541-9800(05)70292-1.

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49

Rieger, E. "Gamma-Ray Precursors of Solar Flares." International Astronomical Union Colloquium 142 (1994): 645–48. http://dx.doi.org/10.1017/s0252921100077927.

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AbstractBursts have been observed by the gamma-ray spectrometer on SMM at medium- and high-energy gamma-rays that precede the flare maximum. The negligible contribution of nuclear lines in the spectra of these events and their impulsive appearance suggests that they are hard-electron-dominated events superposed on the flares. Spatial resolution at gamma-ray energies will be necessary to decide whether this kind of bursts is cospatial with the flares or whether they occur in the flares’ vicinity.Subject headings: Sun: flares — Sun: X-rays, gamma rays

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50

ELIASSON, BENGT, and CHUAN SHENG LIU. "An electromagnetic gamma-ray free electron laser." Journal of Plasma Physics 79, no. 6 (2013): 995–98. http://dx.doi.org/10.1017/s0022377813000779.

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AbstractWe present a theoretical model for the generation of coherent gamma rays by a free electron laser, where a high-energy electron beam interacts with an electromagnetic wiggler. By replacing the static undulator with a 1-μm laser wiggler, the resulting radiation would go from X-rays currently observed in experiments, to gamma rays. Coherent light in the gamma-ray range would have wide-ranging applications in the probing of matter on sub-atomic scales.

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