Universität zu Köln

Ralet, D., Pietri, S., Rodriguez, T., Alaqeel, M., Alexander, T., Alkhomashi, N., Ameil, F., Arici, T., Atac, A., Avigo, R., Back, T., Bazzacco, D., Birkenbach, B., Boutachkov, P., Bruyneel, B., Bruce, A. M., Camera, F., Cederwall, B., Ceruti, S., Clement, E., Cortes, M. L., Curien, D., De Angelis, G., Desesquelles, P., Dewald, M., Didierjean, F., Domingo-Pardo, C., Doncel, M., Duchene, G., Eberth, J., Gadea, A., Gerl, J., Moradi, F. Ghazi, Geissel, H., Goigoux, T., Goel, N., Golubev, P., Gonzalez, V., Gorska, M., Gottardo, A., Gregor, E., Guastalla, G., Givechev, A., Habermann, T., Hackstein, M., Harkness-Brennan, L., Henning, G., Hess, H., Huyuk, T., Jolie, J., Judson, D. S., Jungclaus, A., Knoebel, R., Kojouharov, I., Korichi, A., Korten, W., Kurz, N., Labiche, M., Lalovic, N., Louchart-Henning, C., Mengoni, D., Merchan, E., Million, B., Morales, A. I., Napoli, D., Naqvi, F., Nyberg, J., Pietralla, N., Podolyak, Zs, Pullia, A., Prochazka, A., Quintana, B., Rainovski, G., Reese, M., Recchia, F., Reiter, P., Rudolph, D., Salsac, M. D., Sanchis, E., Sarmiento, L. G., Schaffner, H., Scheidenberger, C., Sengele, L., Singh, B. S. Nara, Singh, P. P., Stahl, C., Stezowski, O., Thoele, P., Dobon, J. J. Valiente, Weick, H., Wendt, A., Wieland, O., Winfield, J. S., Wollersheim, H. J. and Zielinska, M. (2017). Lifetime measurement of neutron-rich even-even molybdenum isotopes. Phys. Rev. C, 95 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: In the neutron-rich A approximate to 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method: The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the gamma ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a gamma-ray transition with a known energy. This relativistic Doppler-shift-attenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: tau = 29.7(-9.1)(+11.3) ps for the 4(+) state of Mo-108 and tau = 3.2(-0.7)(+ 0.7) ps for the 6(+) state of Mo-102. Conclusions: The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A = 100 to A = 108 with a maximum reached at N = 64. The transition probabilities decrease for Mo-108 which may be related to its well-pronounced triaxial shape indicated by the calculations.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ralet, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietri, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rodriguez, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alaqeel, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alexander, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Alkhomashi, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ameil, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Arici, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Atac, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Avigo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Back, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bazzacco, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Birkenbach, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boutachkov, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruyneel, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bruce, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Camera, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cederwall, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ceruti, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clement, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cortes, M. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Curien, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED De Angelis, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Desesquelles, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dewald, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Didierjean, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Domingo-Pardo, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doncel, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duchene, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eberth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gadea, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerl, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moradi, F. Ghazi UNSPECIFIED UNSPECIFIED UNSPECIFIED Geissel, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goigoux, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goel, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Golubev, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gonzalez, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gorska, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gottardo, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gregor, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guastalla, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Givechev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Habermann, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hackstein, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harkness-Brennan, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hess, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Huyuk, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jolie, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Judson, D. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jungclaus, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knoebel, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kojouharov, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korichi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korten, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurz, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Labiche, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lalovic, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Louchart-Henning, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mengoni, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Merchan, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Million, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Morales, A. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Napoli, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Naqvi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nyberg, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pietralla, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Podolyak, Zs UNSPECIFIED UNSPECIFIED UNSPECIFIED Pullia, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Prochazka, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Quintana, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rainovski, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reese, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Recchia, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Reiter, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rudolph, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Salsac, M. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sanchis, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sarmiento, L. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaffner, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scheidenberger, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sengele, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, B. S. Nara UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, P. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stahl, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stezowski, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Thoele, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dobon, J. J. Valiente UNSPECIFIED UNSPECIFIED UNSPECIFIED Weick, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wendt, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wieland, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winfield, J. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wollersheim, H. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zielinska, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-236308
DOI:	10.1103/PhysRevC.95.034320
Journal or Publication Title:	Phys. Rev. C
Volume:	95
Number:	3
Date:	2017
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 SPECTROSCOPY; FISSION FRAGMENTS; GSI; STATES; AGATA; TRACKING; NUCLEI; MO-104; PERFORMANCE; DETECTORS Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23630