Details
| Original language | English |
|---|---|
| Article number | 055503 |
| Journal | Physical Review C |
| Volume | 110 |
| Issue number | 5 |
| Publication status | Published - Nov 2024 |
| Externally published | Yes |
Abstract
Highly precise measurements of the Tc99β spectrum were performed in two laboratories using metallic magnetic calorimeters. Independent sample preparations, evaluation methods, and analyses yielded consistent results and the spectrum could be measured down to less than 1keV. Consistent β spectra were also obtained via cross evaluations of the experimental data sets. An additional independent measurement with silicon detectors in a 4π configuration confirms the spectrum shape above 25keV. Detailed theoretical calculations were performed using the nuclear shell model and including atomic effects. The spectrum shape was found to be sensitive to the effective value of the axial-vector coupling constant. Combining measurements and predictions, we extracted Qβ=295.82(16)keV, gVeff=0.376(5), and gAeff=0.574(36), which seems to solve an inconsistency of the quenched coupling constants between first and higher forbidden nonunique transitions. Furthermore, we derived the mean energy of the β spectrum, Ēβ=98.51(23)keV, logf=-0.47660(22), and logft=12.3478(23).
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
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In: Physical Review C, Vol. 110, No. 5, 055503, 11.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High precision measurement of the Tc 99 β spectrum
AU - Paulsen, M.
AU - Ranitzsch, P. C.O.
AU - Loidl, M.
AU - Rodrigues, M.
AU - Kossert, K.
AU - Mougeot, X.
AU - Singh, A.
AU - Leblond, S.
AU - Beyer, J.
AU - Bockhorn, L.
AU - Enss, C.
AU - Wegner, M.
AU - Kempf, S.
AU - Nähle, O.
N1 - Publisher Copyright: © 2024 authors. Published by the American Physical Society.
PY - 2024/11
Y1 - 2024/11
N2 - Highly precise measurements of the Tc99β spectrum were performed in two laboratories using metallic magnetic calorimeters. Independent sample preparations, evaluation methods, and analyses yielded consistent results and the spectrum could be measured down to less than 1keV. Consistent β spectra were also obtained via cross evaluations of the experimental data sets. An additional independent measurement with silicon detectors in a 4π configuration confirms the spectrum shape above 25keV. Detailed theoretical calculations were performed using the nuclear shell model and including atomic effects. The spectrum shape was found to be sensitive to the effective value of the axial-vector coupling constant. Combining measurements and predictions, we extracted Qβ=295.82(16)keV, gVeff=0.376(5), and gAeff=0.574(36), which seems to solve an inconsistency of the quenched coupling constants between first and higher forbidden nonunique transitions. Furthermore, we derived the mean energy of the β spectrum, Ēβ=98.51(23)keV, logf=-0.47660(22), and logft=12.3478(23).
AB - Highly precise measurements of the Tc99β spectrum were performed in two laboratories using metallic magnetic calorimeters. Independent sample preparations, evaluation methods, and analyses yielded consistent results and the spectrum could be measured down to less than 1keV. Consistent β spectra were also obtained via cross evaluations of the experimental data sets. An additional independent measurement with silicon detectors in a 4π configuration confirms the spectrum shape above 25keV. Detailed theoretical calculations were performed using the nuclear shell model and including atomic effects. The spectrum shape was found to be sensitive to the effective value of the axial-vector coupling constant. Combining measurements and predictions, we extracted Qβ=295.82(16)keV, gVeff=0.376(5), and gAeff=0.574(36), which seems to solve an inconsistency of the quenched coupling constants between first and higher forbidden nonunique transitions. Furthermore, we derived the mean energy of the β spectrum, Ēβ=98.51(23)keV, logf=-0.47660(22), and logft=12.3478(23).
UR - http://www.scopus.com/inward/record.url?scp=85210397383&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.110.055503
DO - 10.1103/PhysRevC.110.055503
M3 - Article
AN - SCOPUS:85210397383
VL - 110
JO - Physical Review C
JF - Physical Review C
SN - 2469-9985
IS - 5
M1 - 055503
ER -