The Focal-Plane Detector Package on the TUNL Split-Pole Spectrograph

A focal-plane detector for the Enge split-pole spectrograph at the Triangle Universities Nuclear Laboratory has been designed. The detector package consists of two position-sensitive gas avalanche counters: a gas proportionality energy loss section and a residual energy scintillator. This setup allows both particle identification and focal-plane reconstruction. In this paper, we will detail the construction of each section along with their accompanying electronics and data acquisition. Effects of energy loss throughout the detector, ray-tracing procedures, and resolution as a function of fill pressure and bias voltage are also investigated. A measurement of the 27Al $(d,p)$ reaction is used to demonstrate a detector performance and to illustrate a Bayesian method of energy calibration.

[1]  H. W. Fulbright,et al.  The Rochester heavy ion detector , 1975 .

[2]  R. Robertson,et al.  High resolution position-sensitive proportional counter☆ , 1975 .

[3]  M. Basunia.  Nuclear Data Sheets for A = 28 , 2013 .

[4]  D. Bardayan,et al.  Transfer reactions in nuclear astrophysics , 2016 .

[5]  A. Izenman.  Recent Developments in Nonparametric Density Estimation , 1991 .

[6]  J. Clark,et al.  Experimental evidence for a natural parity state in Mg26 and its impact on the production of neutrons for the s process , 2007, 0709.1743.

[7]  The ion-optics of a split pole magnetic spectrograph , 1967 .

[8]  H. A. Enge,et al.  Split-pole magnetic spectrograph for precision nuclear spectroscopy , 1967 .

[9]  J. Fischer,et al.  X-ray position detection in the region of 6 μm RMS with wire proportional chambers , 1986 .

[10]  T. H. Braid,et al.  An ionization-chamber type of focal-plane detector for heavy ions☆ , 1976 .

[11]  J. Fischer,et al.  Multiwire proportional chamber focal-plane detector , 1975 .

[12]  Doreen Eichel,et al.  Data Analysis A Bayesian Tutorial , 2016 .

[13]  H.W. Kraner,et al.  Radiation detection and measurement , 1981, Proceedings of the IEEE.

[14]  H. Angerer,et al.  A new multiwire proportional chamber with fast single strip readout and individual analog to digital conversion , 1988 .

[15]  A. Cunsolo,et al.  Ion optics for large-acceptance magnetic spectrometers: application to the MAGNEX spectrometer , 2002 .

[16]  Arthur E Champagne,et al.  Synthesis of the elements in stars: forty years of progress , 1997 .

[17]  K. Langanke,et al.  The role of radioactive ion beams in nuclear astrophysics , 2013 .

[18]  Christian Iliadis,et al.  Nuclear physics of stars , 2007 .

[19]  H. A. Enge,et al.  Magnetic spectrographs for nuclear reaction studies , 1979 .

[20]  Fons Rademakers,et al.  ROOT — An object oriented data analysis framework , 1997 .

[21]  A. Dell'Acqua,et al.  Geant4 - A simulation toolkit , 2003 .

[22]  W. Marsden.  I and J , 2012 .

[23]  L. K. Fifield,et al.  The identification and rejection of energy-degraded events in gas ionization counters , 1988 .

[24]  A. Gelman.  Prior distributions for variance parameters in hierarchical models (comment on article by Browne and Draper) , 2004 .

[25]  F. Wolfs,et al.  Segmented focal plane detector for light and heavy ions , 1992 .

[26]  Veljko Radeka,et al.  Capacitive charge division in centroid finding cathode readouts in MWPCs. Revision 1/93 , 1987 .

[27]  D. Hendrie.  Magnetic Detection of Charged Particles , 1974 .

[28]  A. Doucet,et al.  Computational Advances for and from Bayesian Analysis , 2004 .