Design of the recoil mass separator St. George
نویسندگان
چکیده
A recoil mass separator has been designed for the purpose of studying low energy ða; gÞ reactions in inverse kinematics for beam masses up to about A 1⁄4 40. Their reaction rates are of importance for our understanding of energy production and nucleosynthesis during stellar and explosive helium burning. The reactions take place in a windowless He gas target at the beginning of the separator which consists of three sections. The first section selects the most abundant charge state. The Wien filter in the second section efficiently separates the intense beam from the few reaction products. In the last section the reaction products are focused into a detector system consisting of time pickup and energy detectors. In order to accept the complete kinematic cone of recoil particles for energies as low as reasonably possible we specified a large circular angular acceptance of 40mrad. This requires a careful minimization of higher-order aberrations. The present system has been designed to allow for a future upgrade to extend the experimental program to the analysis of ðp; gÞ reactions. r 2007 Elsevier B.V. All rights reserved. PACS: 07.55. w; 07.55.þh; 29.30.Aj; 41.85. p; 41.75. i; 25.40.Lw; 26.50.þx
منابع مشابه
Recoil separator ERNA: charge state distribution, target density, beam heating, and longitudinal acceptance
For improved cross section measurements of the reaction Cða; gÞO in inverted kinematics, a recoil separator ERNA is developed at the 4MV Dynamitron tandem accelerator in Bochum to detect directly the O recoils with high efficiency. The O recoils are produced by the C projectiles in a windowless He gas target. We report on the charge state distribution of the O recoils, the gas target density, t...
متن کاملValidity and Reliability of the Persian Version of the St. George Respiratory Questionnaire for COPD
Background and Objective: Chronic obstructive pulmonary disease (COPD) is a common disease that causes 6% of deaths, 90% of which occur in low- and middle-income countries. Improving these patients' quality of life (QOL) is one of the primary treatment goals. The St. George's Respiratory Questionnaire (SGRQ) is used to measure the health status of patients with respiratory problems. This resear...
متن کاملIsotopic production cross sections of ssion residues in Au-on-proton collisions at 800 A MeV
Interactions of Au projectiles at 800 A MeV with protons leading to ssion are investigated. We measured the production cross sections and velocities of all ssion residues which are fully identi ed in atomic and mass number by using the inight separator FRS at GSI. The new data are compared with earlier measurements of the characteristics of ssion in similar reactions. Both the production cross ...
متن کاملResults from the development of ionization detection systems for the DRAGON facility
We discuss the implementation of an ionization detection system for the focal plane of the DRAGON recoil mass separator. We report recent tests performed with stable beams to test the feasibility of such a system for use in measurements of radiative capture reactions in inverse kinematics with radioactive beams. 2003 Published by Elsevier Science B.V. PACS: 29.40.Cs; 26.50.+x
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008