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SUMMARY:New equipment and methodologies for (alpha\,n) measurements within
  MANY at CNA HiSPANoS
DTSTART;VALUE=DATE-TIME:20251120T080000Z
DTEND;VALUE=DATE-TIME:20251120T081500Z
DTSTAMP;VALUE=DATE-TIME:20260420T161244Z
UID:indico-contribution-29004@indico.ific.uv.es
DESCRIPTION:Speakers: Gabriel Auñón Fernández (UNIVERSIDAD DE SEVILLA)\
 nNeutrons from ($\\alpha$\,n) reactions are essential for astrophysics\, d
 ark matter experiments\, and nuclear material interrogation\, yet availabl
 e cross-section and yield data are limited and often uncertain [1]. To imp
 rove this situation\, the Spanish nuclear physics community has establishe
 d the MANY Collaboration (Measurement of Alpha Neutron Yields). \n\nAt CNA
  [2]\, the 3 MV tandem accelerator provides alpha beams up to 9 MeV\, eith
 er in continuous mode (maximum 500 nA with the ALPHATROSS source [3]) for 
 activation and neutron counting\, or in pulsed mode (2% duty cycle) for ti
 me-of-flight [4].  \n\nRecent and planned upgrades at the neutron beam lin
 e CNA-HiSPANoS aim to expand its capabilities for ($\\alpha$\,n) measureme
 nts: a new buncher system has been installed\, improving the structure of 
 the pulsed beam and allowing for more precise time-of-flight measurements\
 , a more intense He$^{++}$ ion source (NEC-TORVIS [5]) has been acquired a
 nd is expected to increase the beam intensity by an order of magnitude\, a
 nd the purchase of a new array of fast neutron detectors (EJ-309) is under
 way in order to improve detection efficiency and angular coverage. \n\nIn 
 parallel\, an innovative technique for beam current determination in non-c
 onductive materials and/or some gaseous elements\, using aluminum alloys. 
 By employing an AlN alloy target\, the ($\\alpha$\,n) reaction on $^{14}$N
 \, in principle a gaseous target that would pose a serious difficulty\, is
  measured with respect to the well-known $^{27}$Al($\\alpha$\,n)$^{30}$P r
 eaction\, enabling a reliable Thick Target Yield (TTY) measurement by mean
 s of activation. \n\nThis contribution will include the definitive results
  for the measurement of the $^{27}$Al($\\alpha$\,n)$^{30}$P reaction by ac
 tivation as well as preliminary results for the $^{14}$N($\\alpha$\,n)$^{1
 7}$F measurements and the commissioning of the new bunching system for $\\
 alpha$ beams. Then\, planned upgrades of the ion source and the neutron de
 tectors will be presented.\n\n[1] D. Cano-Ott et al.\, Review of Neutron Y
 ield from ($\\alpha$\, n) Reactions: Data\, Methods\, and Prospects\, [htt
 ps://arxiv.org/abs/2405.07952]\n[2] J. Gómez-Camacho\, J. García López\
 , C\, Guerrero et al. Research facilities and highlights at the Centro Nac
 ional de Aceleradores (CNA)\, Eur. Phys. J. Plus 136\, 273 (2021). https:/
 /doi.org/10.1140/epjp/s13360-021-01253-x \n[3] NEC Alphatross Source RF-Ch
 arge Exchange Ion Source https://www.pelletron.com/ \n[4] M.A. Millán-Cal
 lado et al.\, Continuous and pulsed fast neutron beams at the CNA HiSPANoS
  facility. Rad. Phys. & Chem. 217 (2024) 111464 \n[5] NEC Toroidal Volume 
 Ion Source https://www.pelletron.com/\n\nhttps://indico.ific.uv.es/event/8
 035/contributions/29004/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29004/
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