Universität zu Köln

Biswas, S., Lemasson, A., Rejmund, M., Navin, A., Kim, Y. H., Michelagnoli, C., Stefan, I, Banik, R., Bednarczyk, P., Bhattacharya, S., Bhattacharyya, S., Clement, E., Crawford, H. L., de France, G., Fallon, P., Fremont, G., Goupil, J., Jacquot, B., Li, H. J., Ljungvall, J., Maj, A., Menager, A., More, V, Palit, R., Perez-Vidal, R. M., Ropert, J., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Collado, J., Cullen, D. M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Million, B., Napoli, D. R., Pullia, A., Quintana, B., Ralet, D., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, Ch, Valiente-Dobon, J. J. and Zielinska, M. (2019). Effects of one valence proton on seniority and angular momentum of neutrons in neutron-rich(51)( 122-)(131)Sb isotopes. Phys. Rev. C, 99 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: Levels fulfilling the seniority scheme and relevant isomers are commonly observed features in semimagic nuclei; for example, in Sn isotopes (Z = 50). Seniority isomers in Sn, with dominantly pure neutron configurations, directly probe the underlying neutron-neutron (vv) interaction. Furthermore, an addition of a valence proton particle or hole, through neutron-proton (v pi) interaction, affects the neutron seniority as well as the angular momentum. Purpose: Benchmark the reproducibility of the experimental observables, like the excitation energies (E-x) and the reduced electric-quadrupole transition probabilities [B(E2)], with the results obtained from shell-model interactions for neutron-rich Sn and Sb isotopes with N < 82. Study the sensitivity of the aforementioned experimental observables to the model interaction components. Furthermore, explore from a microscopic point of view the structural similarity between the isomers in Sn and Sb, and thus the importance of the valence proton. Methods: The neutron-rich Sb122-131 isotopes were produced as fission fragments in the reaction Be-9(U-238, f) with 6.2 MeV/u beam energy. A unique setup, consisting of AGATA, VAMOS++, and EXOGAM detectors, was used which enabled the prompt-delayed gamma-ray spectroscopy of fission fragments in the time range of 100 ns to 200 mu s. Results: New isomers and prompt and delayed transitions were established in the even-A Sb122-131 isotopes. In the odd-A Sb122-131 isotopes, new prompt and delayed gamma-ray transitions were identified, in addition to the confirmation of the previously known isomers. The half-lives of the isomeric states and the B(E2) transition probabilities of the observed transitions depopulating these isomers were extracted. Conclusions: The experimental data was compared with the theoretical results obtained in the framework of large-scale shell-model (LSSM) calculations in a restricted model space. Modifications of several components of the shell-model interaction were introduced to obtain a consistent agreement with the excitation energies and the B(E2) transition probabilities in neutron-rich Sn and Sb isotopes. The isomeric configurations in Sn and Sb were found to be relatively pure. Furthermore, the calculations revealed that the presence of a single valence proton, mainly in the g(7/2) orbital in Sb isotopes, leads to significant mixing (due to the v pi interaction) of (i) the neutron seniorities (upsilon(v)) and (ii) the neutron angular momentum (I-v). The above features have a weak impact on the excitation energies, but have an important impact on the B(E2) transition probabilities. In addition, a constancy of the relative excitation energies irrespective of neutron seniority and neutron number in Sn and Sb was observed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Biswas, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lemasson, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rejmund, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Navin, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Y. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michelagnoli, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stefan, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Banik, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bednarczyk, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhattacharya, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bhattacharyya, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clement, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crawford, H. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED de France, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fallon, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fremont, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goupil, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacquot, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ljungvall, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maj, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menager, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED More, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Palit, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Perez-Vidal, R. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ropert, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barrientos, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Benzoni, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Birkenbach, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boston, A. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boston, H. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cederwall, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Collado, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cullen, D. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Desesquelles, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Domingo-Pardo, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dudouet, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eberth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gonzalez, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Harkness-Brennan, L. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hess, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jungclaus, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korten, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Labiche, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lefevre, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menegazzo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mengoni, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Million, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Napoli, D. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pullia, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Quintana, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ralet, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Recchia, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reiter, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Saillant, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Salsac, M. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchis, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stezowski, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Theisen, Ch UNSPECIFIED UNSPECIFIED UNSPECIFIED Valiente-Dobon, J. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zielinska, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-138222
DOI:	10.1103/PhysRevC.99.064302
Journal or Publication Title:	Phys. Rev. C
Volume:	99
Number:	6
Date:	2019
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 GAMMA-RAY; ISOMERS; NUCLEI; STATES; DECAY Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13822