Universität zu Köln

Heim, F., Mueller, M., Wilden, S. and Zilges, A. (2021). Absolute Mo-96(p, n)Tc96m+g cross sections and a new branching for the Tc-96m decay. Phys. Rev. C, 103 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: Radionuclides in the Mo-Tc region play an important role in modern medical diagnostics. These applications require a gamma-emitting radioisotope that is injected into the patient. Various production methods of those radionuclides have been investigated in the past; among them are (p, x) reactions on natural or enriched molybdenum. Reliable estimations for the produced activity of the radionuclides and radioactive byproducts are required. Therefore, either precise theoretical calculations or a firm experimental database for the nuclear production reactions are needed. In addition, experimental cross-section data of proton-induced reactions on heavy nuclei are very valuable to test nuclear models that enter theoretical calculations of reaction rates relevant for nuclear astrophysics. Purpose: The present paper reports on experimental cross sections of the Mo-96(p, n)Tc96m+g reaction. The contribution of the ground-state population as well as for the population of the metastable state in Tc-96 are determined individually. The obtained results are very valuable to test existing models that enter statistical model calculations. In addition, the present work aims at remeasuring the branching ratio of the decay of the metastable state Tc-96m. Method: Highly enriched Mo-96 targets were irradiated with protons at energies between E-p = 3.9 MeV and Ep = 5.4MeV, which are slightly above the (p, n) threshold (Eth = 3.8MeV). By employing an offline analysis, the gamma-ray decay of the reaction product was investigated and reaction cross sections were calculated by means of the activation technique. Results: Individual reaction cross sections for the production channel of the metastable state sm and the ground state delta(gs) as well as the branching of the Tc-96m -> Tc-96 decay were determined. Conclusion: The measured cross sections are in good agreement with previously measured cross sections as well as with recent Hauser-Feshbach calculations. The new branching ratio for the direct decay of Tc-96m into Mo-96 amounts to 4.1(-0.34)(+0.39)% compared to previously reported 2 +/- 0.5%.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Heim, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilden, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-562457
DOI:	10.1103/PhysRevC.103.054613
Journal or Publication Title:	Phys. Rev. C
Volume:	103
Number:	5
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INDUCED NUCLEAR-REACTIONS; EXCITATION-FUNCTIONS; REACTION-RATES Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56245