Excitation of the isomeric states 1h11/2 in the nuclear reactions with γ-quanta, neutrons and at β decay
Creators
- 1. Ob''edinennyj Inst. Yadernykh Issledovanij, Dubna (Joint Institute for Nuclear Research (JINR))
- 2. Inst. Yadernykh Issledovanij i Yadernoj Ehnergii, Sofiya (Bulgaria)
- 3. Univ. im. P. Khilendarskogo, Plovdiv (Bulgaria)
Description
The isomeric ratios (IR) were measured in the isotones with N = 81 (135Xe, 137Ba, 139Ce, 141Nd, and 143Sm). Isomers with Jπ 11/2- were excited in the reactions (n, γ), (γ, n), and β+ decay of 139Pr and 141Pm. The activation methods of γ-spectrum measurement of reaction products was used. The marked difference of IR was observed in the isotones with the different atomic numbers Z but in the same reactions. The calculations of IR using low-level spectrum of final nuclei and probability of radiation transitions on the base of the quasiparticle phonon model were performed. The satisfactory agreement of the measured and calculated IR was obtained for all studied isotopes. The dependence of IR on Z is explained by the different energy of reaction and different probability levels population of the activation
Abstract (Russian)
Измерены изомерные отношения (ИО) в изотонах с N = 81 (135Xe, 137Ba, 139Ce, 141Nd и 143Sm). Изомеры с Jπ = 11/2- возбуждались в реакциях (n, γ), (γ, n) и β+-распаде 139Pr и 141Pm. Для определения выхода реакций использован активационный метод с измерением γ-спектров продуктов реакций. Обнаружено заметное различие ИО для изотонов с разными атомными номерами Z в одних и тех же реакциях. Проведены расчеты ИО, в которых спектр низколежащих уровней конечных ядер и вероятности радиационных переходов устанавливались на основе квазичастично-фононной модели. Для всех исследованных изотопов получено хорошее согласие экспериментальных и расчетных значений ИО. Зависимость ИО от Z ядра объясняется различием энергий реакций, что приводит к разным вероятностям возбуждения активационных уровней, через которые происходит заселение изомеровAdditional details
Additional titles
- Original title (Russian)
- Возбуждение изомерных состояний 1h
Publishing Information
- Journal Title
- Yadernaya Fizika
- Journal Volume
- 64
- Journal Issue
- 11
- Journal Page Range
- p. 1987-1994
- ISSN
- 0044-0027
- CODEN
- IDFZA7
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 34010397
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- ATOMIC NUMBER; BARIUM 137; BETA-PLUS DECAY; CERIUM 139; GAMMA RADIATION; GAMMA SPECTRA; GROUND STATES; ISOMER RATIO; ISOMERIC NUCLEI; NEODYMIUM 141; NEUTRON REACTIONS; NEUTRONS; PHOTONUCLEAR REACTIONS; PRASEODYMIUM 139; PROMETHIUM 141; QUASIPARTICLE-PHONON MODEL; SAMARIUM 143; SPECTROSCOPY; XENON 135
- Descriptors DEC
- ALKALINE EARTH ISOTOPES; BARIUM ISOTOPES; BARYON REACTIONS; BARYONS; BETA DECAY; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CERIUM ISOTOPES; DAYS LIVING RADIOISOTOPES; DECAY; ELECTROMAGNETIC RADIATION; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTARY PARTICLES; ENERGY LEVELS; EVEN-ODD NUCLEI; FERMIONS; HADRON REACTIONS; HADRONS; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATHEMATICAL MODELS; MINUTES LIVING RADIOISOTOPES; NEODYMIUM ISOTOPES; NUCLEAR DECAY; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; ODD-EVEN NUCLEI; PRASEODYMIUM ISOTOPES; PROMETHIUM ISOTOPES; RADIATIONS; RADIOISOTOPES; RARE EARTH NUCLEI; SAMARIUM ISOTOPES; SECONDS LIVING RADIOISOTOPES; SPECTRA; STABLE ISOTOPES; XENON ISOTOPES
Optional Information
- Notes
- 33 refs., 2 figs., 2 tabs.