Laue diffraction lenses for astrophysics: From theory to experiments     

Hubert Halloin 《Experimental Astronomy》2005,20(1-3):171-184

Based on the laws of X-ray diffraction in crystals, Laue lenses offer a promising way to achieve the sensitivity and angular resolution leap required for the next generation of hard X-ray and gamma-ray telescopes.The present paper describes the instrumental responses of Laue diffraction lenses designed for nuclear astrophysics. Different possible geometries are discussed, as well as the corresponding spectral and imaging capabilities. These theoretical predictions are then compared with Monte-Carlo simulations and experimental results (ground and stratospheric observations from the CLAIRE project). PACS 95.55.Ka, 61.50.Ah, 61.10.−i, 41.50.+h  相似文献   

BATSE/OSSE rapid burst response     

S. M. Matz  J. E. Grove  W. N. Johnson  J. D. Kurfess  G. H. Share  G. J. Fishman  C. A. Meegan 《Astrophysics and Space Science》1995,231(1-2):127-130

The BATSE and OSSE instrument teams have modified flight software to promptly (within 2 min of trigger) slew the OSSE detectors to burst locations determined on-board by BATSE. This enables OSSE to make sensitive searches for prompt and delayed post-burst line and continuum emission above 50 keV. In the best cases our sensitivity will be more than an order of magnitude better than any other search in this energy range. We expect to slew to 1–2 bursts per month, based on the OSSE FOV and BATSE event rate. Detections or limits from continued operation of this system may provide significant constraints on burst models. As an example of the observations made using this system, we present preliminary limits for post-burst emission from GRB 950223 on several time scales.  相似文献   

Interpretation of gamma-ray logs: The distribution of uranium in carbonate platform     

Mohamed Chaker Raddadi  Annie Arnaud Vanneau  Grard Poupeau  Elisabeth Carrio-Schaffhauser  Hubert Arnaud  Alice Rivera 《Comptes Rendus Geoscience》2005,337(16):96

High gamma-radioactivity in carbonates is usually ascribed to uranium of detrital minerals and organic matter, and to thorium and potassium of clays. The present study based on Urgonian marls and marly limestones (France) shows that some of the most radioactive values correspond instead to some ‘pure’ limestones. These peaks are generally associated with a sequence boundary or a maximum flooding surface. Low-level γ-spectrometry and ICP–MS analyses show that although high radioactivities are mostly associated with uranium, there is no obvious correlation between uranium enrichment and lithology. Also, correlation between high radioactivity and argillaceous beds might not be systematic. To cite this article: M.C. Raddadi et al., C. R. Geoscience 337 (2005).  相似文献   

钻孔伽玛场理论及形态系数计算的进一步研究     

段波 《铀矿地质》1991,7(1):49-58

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γ测井资料反褶积分层解释法在8411矿床的试验对比   总被引：1，自引：0，他引：1  

胡传海 《铀矿地质》1986,(6)

γ测井资料的反褶积分层解释法具有方法简单,精度高,速度快,分辨能力强,用微机进行计算等优点。作者通过用反褶积法对8411矿床γ测井资料的解释,对视特征参数的选择条件,γ强度底数的确定和划分矿层边界的原则,提出了初步看法。将该法的试验结果与传统的平均含量法和矿心分析结果进行了对比,还分析了视特征参数的取值大小对矿层线储量及矿化分层的影响,并讨论了引起线储量相对误差的原因。  相似文献   

改进型反褶积分层解释法——一种应用PC～1500计算机处理γ测井资料的新方法     

狄觉斋 《铀矿地质》1987,(2)

本文吸取了现行Υ测井资料解释方法的合理部分,提出了改进型反褶积分层解释法。叙述了方法的原理及设置判别因子的原则。作者以PC-1500微机为例给出了改进后的反褶积分层解释法程序流程图。通过对模型钻孔和实际钻孔测井资料的解释,证实了方法的合理性和可行性,克服了目前平均强度法中存在的人为影响,扩大了一般分层解释法的应用范围,该法可在现场及时取得结果,提高了解释速度和质量。  相似文献   

双星γ脉冲星PSR1820-11     

李惕碚  吴枚 《中国天文和天体物理学报》1990,(2)

通过对γ天文卫星COS-B观测数据的成像分析,我们在近银河中心区域找到一个新的γ射线源.图1为对50—150MeV能区γ射线的成像结果.图1中的“+”号为双星射电脉冲星PSR1820-11的位置,在γ射线成像误差范围内与γ强度峰的位置相符.  相似文献   

Whipple telescope observations of LS I +61 303: 2004–2006     

A. Smith  R. W. Atkins  S. Bradbury  O. Celik  Y. C. K. Chow  P. Cogan  C. Dowdall  S. J. Fegan  P. Fortin  D. Gall  G. H. Gillanders  J. Grube  K. J. Gutierrez  T. A. Hall  D. Hanna  J. Holder  D. Horan  S. B. Hughes  T. B. Humensky  I. Jung  P. Kaaret  G. Kenny  M. Kertzman  D. B. Kieda  A. Konopelko  H. Krawczynski  F. Krennrich  M. J. Lang  S. Le Bohec  G. Maier  J. Millis  P. Moriarty  R. A. Ong  J. S. Perkins  K. Ragan  G. H. Sembroski  J. A. Toner  L. Valcarcel  V. V. Vassiliev  R. G. Wagner  S. P. Wakely  T. C. Weekes  R. J. White  D. A. Williams 《Astrophysics and Space Science》2007,309(1-4):299-303

In this paper we present the results of the past two years observations on the galactic microquasar LS I +61 303 with the Whipple 10 m gamma-ray telescope. The recent MAGIC detection of the source between 200 GeV and 4 TeV suggests that the source is periodic with very high energy (VHE) gamma-ray emission linked to its orbital cycle. The entire 50-hour data set obtained with Whipple from 2004 to 2006 was analyzed with no reliable detection resulting. The upper limits obtained in the 2005–2006 season covered several of the same epochs as the MAGIC Telescope detections, albeit with lower sensitivity. Upper limits are placed on emission during the orbital phases of 0→0.1 and 0.8→1, phases which are not included in the MAGIC data set.   相似文献   

HAXTEL: A Laue lens telescope development project for a deep exploration of the hard X-ray sky (> 60 keV)     

F. Frontera  A. Pisa  G. Loffredo  D. Pellicciotta  V. Carassiti  F. Evangelisti  K. Andersen  P. Courtois  L. Amati  E. Caroli  T. Franceschini  G. Landini  S. Silvestri  J. Stephen 《Experimental Astronomy》2005,20(1-3):241-251

A review of the HAXTEL project devoted to the development of a Laue lens telescope for hard X-/gamma-ray observation of the continuum spectra of celestial sources is presented. Main design properties, open issues, the status of the project and an example of multi-lens configuration with sensitivity expectations are discussed.  相似文献   

Four years of BATSE gamma-ray burst observations     

Michael S. Briggs 《Astrophysics and Space Science》1995,231(1-2):3-10

In four years BATSE has observed more than 1000 gamma-ray bursts, making unprecedented measurements of their spatial and brightness distributions. These measurements and their implications for the origin of gamma-ray bursts are reviewed.  相似文献