XIII CPAN days
Measurement of 27 Al(α,n)n) 30 P thick target neutron yields at CMAM using the miniBELEN-10A neutron counter
N. Mont-Gelia, A. Tarifeño-Saldiviac , L.M. Fraileb, J.L. Taínc, A. Pereah, G. Cortésa, M. Pallàsa, E. Nácherc, G. Garcíad, S. Viñalsd, V. Alcaynee, A.
Algorac, J. Balibreac, J. Benitob, M.J.G. Borgeh, J. Brizh, F. Calviñoa, D. Cano-Otte, A. De Blasa, C. Domingo-Pardoc, B. Fernándezf,g, R. Garcíaa, J.
Gómez-Camachof,g, E.M. González-Romeroe, C. Guerrerof,g, J. Lerendegui-Marcoc, M. Llanosb, V, T. Martíneze, E. Mendozae, J.R. Muriasb, S.E.A.
Orrigoc, A. Pérez de Radae, V. Pesudoe, J. Plazae,J.M. Quesadaf, A. Sáncheze, V. Sánchez-Temblequeb, R. Santorellie, O. Tengbladh, A. Tolosa- Delgadoi, J.M. Udíasb and D. Villamaríne
aInstitut de Tècniques Energètiques (INTE), Universitat Politècnica de Catalunya (UPC), E-08028 Barcelona, Spain
bGrupo de Física Nuclear (GFN), Universidad Complutense (UCM), E-28040 Madrid, Spain
cInstituto de Física Corpuscular (IFIC), CSIC, E-46071 Valencia, Spain
dCentro de Micro-Análisis de Materiales (CMAM), Universidad Autónoma de Madrid (UAM), E-28049 Madrid, Spain.
eCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-2804 Madrid, Spain
fDpto. Física Atómica, Molecular y Nuclear, Universidad de Sevilla (US), E-41009 Sevilla, Spain
gCentro Nacional de Aceleradores CNA (U. Sevilla - J. Andalucía - CSIC), E-41092 Sevilla, Spain
hInstituto de Estructura de la Materia (IEM), CSIC, E-28049 Madrid, Spain
iUniversity of Jyväskylä, Department of Physics, PO Box 35, FI-40014, Jyväskylä, Finland
MANY
Measurement of Alpha Neutron Yields and spectra (MANY)
● MANY is and effort by several spanish institutions aiming to develop a scientific program for (α,n) reactions using the currently available national facilities.
● History: the MANY collaboration started in 2019 (workshop at CIEMAT) and due to the COVID pandemics the first measurements were not carried out until 2021 (this talk).
CNA @ Sevilla
MANY
Measurement of Alpha Neutron Yields and spectra (MANY)
miniBELEN
CMAM @ Madrid
(α,n)n) reactions
●
Currently, evaluated data is available only for a limited number of isotopes (17) and the databases present large discrepancies in some cases.
●
Physical interests:
- Source of neutrons for the slow neutron capture nucleosynthesis (the s-process) [TAI16].
- α-particles capture process (the α-process) [WOO92, BLI17].
- Neutron-induced background in underground laboratories [BET10].
- Neutron-induced background in nuclear facilities such as particle accelerators and nuclear reactors [MUR02].
[BET10] A. Bettini, Nucl. Instrum. Methods A 626 - 627 (2010) S64 – S68.
[BLI17] J. Bliss et al. J. Phys. G.: Nucl. Part. Phys. 44 (2017) 054003.
[MUR02] T. Murata and K. Shibata, J. Nucl. Sci. Technol. 39 (2002) 76 – 79.
[TAI16] J.L. Tain et al., J. Phys.: Conf. Ser. 665 (2016) 012031.
[WOO92] S.E. Woosley and R.D. Hoffmann, Astrophys. J. 395 (1992) 202 – 239.
miniBELEN
miniBELEN-10A (modular neutron counter):
N. Mont-Geli, “A novel modular neutron long counter for α,n) reactions: design and experimental validation”, Master’s Thesis U. de Sevilla)
miniBELEN
ε ( E ) = ∑
i=1 3
ε
i( E ) = ∑
i=1 3
f
i( E ) · ε
i( E )
miniBELEN-10A (modular neutron counter):
● 3
He-filled proportional counter + HDPE.
●
Flat response up to 8/10 MeV.
www.particlecounter.net
CMAM
Centro de Micro-Análisis de Materials (CMAM,n) Madrid)
●
5 MV Tandem accelearator. Beam particles:
4He (q = +2).
●
Comissioning campaigns at CMAM: March, September, November and December (this talk) 2021.
Results
PRELIMINARY Not Included:
●
Dead time.
Included:
●
Background correction.
Results
PRELIMINARY Not Included:
●
Dead time.
Included:
●
Background correction.
Results
PRELIMINARY Not Included:
●
Dead time.
Included:
●
Background correction.
Reaction threshold 3.034 MeV
Beam energy (Background/Aluminum) yield
3.6 – 3.7 MeV 30 – 16 %
≥ 5 MeV < 1%
Results
PRELIMINARY Not Included:
●
Dead time.
Included:
●
Background correction.
σ(Eb)=NA
At
Y(E1)−Y(E2) E1−E2 ·dE
dx
miniBELEN
Q (R1/R2) Error Q (R1/R3) Error Q (R2/R3) Error
Q= Rate i / Rate j Eff Ri / Eff Rj
Jacobs and Liskien (1983) 5.5 MeV beam
Bench-marking of the efficiency calculation using the
27Al(α,nn) reactions
Summary
●
We are able to carry out thick target yields measurements.
●
The differential thick target cross sections are consistent, in order of magnitude, with the previous measurements carried out by Flynn et al. 1978) and Howard et al. 1974). The shape of the measured cross-section requires further attention.
●
The ratios between the miniBELEN rings counting rates are consistent with the simulations.
Acknowledgements
This work has been supported by the Spanish Ministerio de Economía y Competitividad under grants:
FPA2017-83946-C2-1 & C2-2
PID2019-104714GB-C21 & C22
