نتایج جستجو برای: delayed neutron

تعداد نتایج: 146806  

Journal: :iranian journal of radiation research 0
h. miri-hakimabad radiation detection and measurement laboratory, ferdowsi university of mashhad, mashhad, iran a. vejdani-noghreiyan radiation detection and measurement laboratory, ferdowsi university of mashhad, mashhad, iran h. panjeh radiation detection and measurement laboratory, ferdowsi university of mashhad, mashhad, iran

background: several landmine detection methods, based on nuclear techniques, have been suggested up to now. neutron-induced gamma emission, neutron and gamma attenuation, and fast neutron backscattering are the nuclear methods used for landmine detection. in this paper an optimized (safe and effective) moderating structure using an 241am-be neutron source for detecting landmines has been invest...

Amir Danyaei Farnaz Rahimli Hojattolah Shabazian Mansour Zabihzadeh Mohammad Ali Behrooz

Introduction: Boron neutron capture therapy (BNCT) is recommended to treat the glioblastoma tumor. It is well known that neuron beams are more effective treatment than photon beams to treat hypoxia tumors due to interaction of neutron with nucleus and production of heavy particles such as 7Li and alpha particle. In this study to evaluate the suitability of BNCT for treating of ...

Alireza Sadremomtaz, Peyvand Taherparvar Sepideh Gholami

Introduction: In recent years, the use of neutrons has increased in various fields such as medicine and industry. One of the important applications of neutrons is in medical research. Neutrons have greater linear energy transfer than gamma rays and are considered more dangerous radiation. Hence, the detection and determination of neutron dose is a very important and vital issu...

Journal: :The Astrophysical Journal 2022

Abstract The ? -delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using Advanced Implantation Detector Array (AIDA) BRIKEN neutron detector array. existing -decay half-life ( T 1/2 ) database was significantly increased toward more isotopes, uncertainties previously values decreased. new data not...

Journal: :Physical Review C 2021

The aCORN experiment measures the neutron-decay electron-antineutrino correlation ($a$ coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where beta electron and recoil are detected delayed coincidence. We report data analysis result from second run at NIST Center Neutron Research, high-flux cold neutron beam new NG-C guide end position: $a=\ensuremath{-...

2003
F. Hosni R. Borcea C. Donzaud F. Ibrahim H. Lefort J. Obert E. Fioretto G. Prete B. Pfeiffer

Yields of neutron-rich isotopes produced by fast neutron induced fission of U were measured at the ISOL set-up Production d Atomes Radioactifs Riches en Neutrons. A surface ion source was used to ionize selectively elements with low ionization potentials. In order to observe also the most n-rich isotopes, the identification was achieved by a combined measurement of band c-rays and b-delayed neu...

Journal: :Physical review letters 2006
Masaru Shibata Matthew D Duez Yuk Tung Liu Stuart L Shapiro Branson C Stephens

A hypermassive neutron star (HMNS) is a possible transient formed after the merger of a neutron-star binary. In the latest axisymmetric magnetohydrodynamic simulations in full general relativity, we find that a magnetized HMNS undergoes "delayed" collapse to a rotating black hole (BH) as a result of angular momentum transport via magnetic braking and the magnetorotational instability. The outco...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1953
H T Yost W R Singleton A F Blakeslee

pattern by making it difficult to delimit sectors clearly. Although the data at hand precluded the possibility of making rigorous comparisons between plants arising from seed subjected to thermal neutrons and plants from x-irradiated seed, no developmental or morphological disturbances or lethality patterns in Datura unique to either kind of treatment were detected. Caldecott, Frolik, and Morri...

ژورنال: سنجش و ایمنی پرتو 2020

Recently, a new Neutron Radiography (NR) beam line has been designed, constricted, installed and tested based on the use of E-beam tube of Tehran Research Reactor (TRR). Initial tests have been shown that the system can be used for different samples and purposes such as nuclear plates and rods fuels.  For this end the system need a suitable irradiation room which should be installed at the NR b...

ژورنال: سنجش و ایمنی پرتو 2014

During the last few years, real time gamma and neutron dosimeters have been developed and semiconductor diodes are frequently used in these dosimeters. Semiconductor diodes are used to charged particle detection. For sensitizing the detector to neutrons, a converter layer is contacted on the front surfaces of them. Incident neutrons interact with the converter and produce charged particles that...

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