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High precision measurement of the 151Sm beta decay by means of a metallic magnetic calorimeter.
Kossert, Karsten; Loidl, Martin; Mougeot, Xavier; Paulsen, Michael; Ranitzsch, Philipp; Rodrigues, Matias.
Affiliation
  • Kossert K; Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany. Electronic address: karsten.kossert@ptb.de.
  • Loidl M; Université Paris-Saclay, CEA List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
  • Mougeot X; Université Paris-Saclay, CEA List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
  • Paulsen M; Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany.
  • Ranitzsch P; Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116, Braunschweig, Germany.
  • Rodrigues M; Université Paris-Saclay, CEA List, Laboratoire National Henri Becquerel (LNE-LNHB), F-91120, Palaiseau, France.
Appl Radiat Isot ; 185: 110237, 2022 Jul.
Article in En | MEDLINE | ID: mdl-35452904
The beta decay of 151Sm was measured by means of a metallic magnetic calorimeter. The measurement and subsequent analysis yielded a beta spectrum with an outstanding high-energy resolution of about 70 eV (FWHM) at 22 keV and a very low energy threshold well below 400 eV. The spectrum exhibited unexpectedly elevated beta emission probabilities at very low energy that we have not been able to reproduce in our theoretical study. The data analysis was thus scrutinized and an independent analysis of the same data set carried out. All new approaches have confirmed the previously found shape of the beta spectrum. The measured spectrum was compared to predictions from an advanced theoretical modeling that includes the atomic exchange effect, precise radiative corrections as well as the realistic nuclear structure that usually plays an important role in first forbidden non-unique transitions. The measured spectrum was then carefully analyzed to determine the maximum beta energy, which was found to be Q = 76.430(68) keV. The dominant beta decay of 151Sm populates the ground state of 151Eu, and a weak beta branch populates the first excited state of 151Eu. From our measurements, the probabilities of these two branches were determined to be 99.31(11)% and 0.69(11)%, respectively.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Appl Radiat Isot Journal subject: MEDICINA NUCLEAR / SAUDE AMBIENTAL Year: 2022 Document type: Article Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Type of study: Prognostic_studies Language: En Journal: Appl Radiat Isot Journal subject: MEDICINA NUCLEAR / SAUDE AMBIENTAL Year: 2022 Document type: Article Country of publication: United kingdom