Search

Your search keyword '"VITÉZ-SVEICZER, A."' showing total 26 results
Start Over Author "VITÉZ-SVEICZER, A."
26 results on '"VITÉZ-SVEICZER, A."'

1. Isospin breaking in the $^{71}$Kr and $^{71}$Br mirror system

Author

Algora, A., Vitéz-Sveiczer, A., Poves, A., Kiss, G. G., Rubio, B., de Angelis, G., Recchia, F., Nishimura, S., Rodriguez, T., Sarriguren, P., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Morales, A. I., Orrigo, S. E. A., Napoli, D., Lenzi, S. M., Boso, A., Phong, V. H., Wu, J., Söderström, P. -A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D. S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Chen, S., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Nieto, T. Kurtukián, Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Schaffner, H., and Kruppa, A.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Isospin symmetry is a fundamental concept in nuclear physics. Even though isospin symmetry is partially broken, it holds approximately for most nuclear systems, which makes exceptions very interesting from the nuclear structure perspective. In this framework, it is expected that the spins and parities of the ground states of mirror nuclei should be the same, in particular for the simplest systems where a proton is exchanged with a neutron or vice versa. In this work, we present evidence that this assumption is broken in the mirror pair $^{71}$Br and $^{71}$Kr system. Our conclusions are based on a high-statistics $\beta$ decay study of $^{71}$Kr and on state-of-the-art shell model calculations. In our work, we also found evidence of a new state in $^{70}$Se, populated in the $\beta$-delayed proton emission process which can be interpreted as the long sought coexisting 0$^+$ state., Comment: 8 pages with references, 3 figures. Supplemental material 4 pages (1 table, 3 figures)

Published
2024

2. Gamow–Teller Beta Decay and Pseudo-SU(4) Symmetry

Author

Piet Van Isacker, Alejandro Algora, András Vitéz-Sveiczer, Gábor Gyula Kiss, Sonja Elena Agata Orrigo, Berta Rubio, and Pablo Aguilera

Subjects
Gamow–Teller β decay, pseudo-SU(4) symmetry, odd–odd N = Z nuclei, Mathematics, QA1-939
Abstract

We report on recent experimental results on β decay into self-conjugate (N=Z) nuclei with mass number 58≤A≤70. Super-allowed β decays from the Jπ=0+ ground state of a Z=N+2 parent nucleus are to the isobaric analogue state through so-called Fermi transitions and to Jπ=1+ states by way of Gamow–Teller (GT) transitions. The operator of the latter decay is a generator of Wigner’s SU(4) algebra and as a consequence GT transitions obey selection rules associated with this symmetry. Since SU(4) is progressively broken with increasing A, mainly as a consequence of the spin–orbit interaction, this symmetry is not relevant for the nuclei considered here. We argue, however, that the pseudo-spin–orbit splitting can be small in nuclei with 58≤A≤70, in which case nuclear states exhibit an approximate pseudo-SU(4) symmetry. To test this conjecture, GT decay strength is calculated with use of a schematic Hamiltonian with pseudo-SU(4) symmetry. Some generic features of the GT β decay due to pseudo-SU(4) symmetry are pointed out. The experimentally observed GT strength indicates a restoration of pseudo-SU(4) symmetry for A=70.

Published
2023
Full Text
View/download PDF

3. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

A. Vitéz-Sveiczer, A. Algora, A.I. Morales, B. Rubio, G.G. Kiss, P. Sarriguren, P. Van Isacker, G. de Angelis, F. Recchia, S. Nishimura, J. Agramunt, V. Guadilla, A. Montaner-Pizá, S.E.A. Orrigo, A. Horváth, D. Napoli, S. Lenzi, A. Boso, V.H. Phong, J. Wu, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, D.S. Ahn, H. Baba, P. Doornebal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono, H. Sakurai, Y. Shimizu, C. Sidong, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grévy, T. Kurtukián Nieto, C. Magron, W. Gelletly, Zs. Dombrádi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diel, D. Lubos, C. Borcea, E. Ganioglu, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I. Kojouharov, N. Kurz, H. Shaffner, and A. Petrovici

Subjects
Beta decay of 70Kr, pn pairing, GT strength distribution, Pseudo-SU(4) symmetry, QRPA calculations, Physics, QC1-999
Abstract

The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.

Published
2022
Full Text
View/download PDF

4. The β-decay of 71Kr: Precise measurement of the half-life

Author

Vitéz-Sveiczer A., Algora A., Kiss G.G., Rubio B., Morales A.I., Sarriguren P., de Angelis G., Recchia F., Nishimura S., Agramunt J., Guadilla V., Montaner-Pizá A., Orrigo S.E.A., Horváth Á., Napoli D., Lenzi S., Boso A., Phong V., Wu J., Söderström P.-A., Sumikama T., Suzuki H., Takeda H., Ahn D.S., Baba H., Doornenbal P., Fukuda N., Inabe N., Isobe T., Kubo T., Kubono S., Sakurai H., Shimizu Y., Sidong C., Blank B., Ascher P., Gerbaux M., Goigoux T., Giovinazzo J., Grévy S., Kurtukián Nieto T., Magron C., Gelletly W., Dombrádi Zs., Fujita Y., Tanaka M., Aguilera P., Molina F., Eberth J., Diel F., Lubos D., Borcea C., Ganioglu E., Nishimura D., Oikawa H., Takei Y., Yagi S., Korten W., de France G., Davies P., Liu J., Lee J., Lokotko T., Kojouharov I., Kurz N., Shaffner H., and Petrovici A.

Subjects
Physics, QC1-999
Abstract

The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN – Nishina Center in order to study its β-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, β-decays and β-delayed protons took place. Beta-delayed γ-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 σ difference between the most precise independent results. Implant–β time correlations, implant–proton time correlations and implant–β–γ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported γ following the β-decay of 71Kr were also identified in the analysis.

Published
2023
Full Text
View/download PDF

5. Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak

Author

Pallàs M., Tarifeño-Saldivia A., Kiss G. G., Tain J. L., Tolosa-Delgado A., Vitéz-Sveiczer A., Calviño F., Agramunt J., Aguilera P., Algora A., Allmond J. M., Baba H., Brewer N. T., Caballero-Folch R., Coleman-Smith P. J., Cortes G., Davinson T., Dillmann I., Domingo-Pardo C., Estrade A., Fukuda N., Go S., Griffin C. J., Grzywacz R. K., Hall O., Harkness-Brennan L. J., Isobe T., Kahl D., King T. T., Korgul A., Kovács S., Kubono S., Labiche M., Liu J., Madurga M., Miernik K., Molina F., Mont-Geli N., Morales A. I., Nácher E., Navarro A., Nepal N., Nishimura S., Piersa-Silkowska M., Phong V., Rasco B. C., Romero-Barrientos J., Rubio B., Rykaczewski K. P., Saito Y., Sakurai H., Shimizu Y., Singh M., Sumikama T., Suzuki H., Szegedi T. N., Takeda H., Wang K., Wolińska-Cichocka M., Woods P. J., and Yokoyama R.

Subjects
Physics, QC1-999
Abstract

Half-lifes (T1/2) of exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted of the BigRIPS in-flight separator for ion selection identification, the Advance Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN detector for neutron counting. Using this setup, 4 new T1/2 have been measured for the first time, and 38 T1/2 have been remeasured with improved precision in several cases. These new experimental data should help to constrain theoretical models for calculations of T1/2. The status of the experimental analysis and preliminary results are provided in this contribution.

Published
2023
Full Text
View/download PDF

6. Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)

Author

Pallàs M., Tarifeño-Saldivia A., Kiss G. G., Tain J. L., Tolosa-Delgado A., Vitéz-Sveiczer A., Calviño F., Agramunt J., Aguilera P., Algora A., Allmond J. M., Baba H., Brewer N. T., Caballero-Folch R., Coleman-Smith P. J., Cortes G., Davinson T., Dillmann I., Domingo-Pardo C., Estrade A., Fukuda N., Go S., Griffin C. J., Grzywacz R. K., Hall O., Harkness-Brennan L. J., Isobe T., Kahl D., King T. T., Korgul A., Kovács S., Kubono S., Labiche M., Liu J., Madurga M., Miernik K., Molina F., Mont-Geli N., Morales A. I., Nácher E., Navarro A., Nepal N., Nishimura S., Piersa-Silkowska M., Phong V., Rasco B. C., Romero-Barrientos J., Rubio B., Rykaczewski K. P., Saito Y., Sakurai H., Shimizu Y., Singh M., Sumikama T., Suzuki H., Szegedi T. N., Takeda H., Wang K., Wolińska-Cichocka M., Woods P. J., and Yokoyama R.

Subjects
Physics, QC1-999
Abstract

At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and β-delayed neutron-emission probabilities (Pxn). The setup consisted of the BigRIPS in-flight separator for particle identification, the Advanced Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN neutron counter for neutron detection. Using this arrangement, 4 new T1/2 and 14 new P1n were measured. Furthermore, 38 T1/2 and 2 P1n values were remeasured, decreasing the uncertainties for some of them. In addition to improving predictions of nucleosynthesis models that describe the production of the rare-earth peak at A ∼ 160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region.

Published
2023
Full Text
View/download PDF

9. The β-decay of 71Kr: Precise measurement of the half-life.

Author

Vitéz-Sveiczer, A., Algora, A., Kiss, G.G., Rubio, B., Morales, A.I., Sarriguren, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, Á., Napoli, D., Lenzi, S., Boso, A., Phong, V., Wu, J., and Söderström, P.-A.

Subjects
*PROTONS, *BERYLLIUM, *ARTIFICIAL implants, *LITERATURE reviews, *DECAY constants
Abstract

The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN – Nishina Center in order to study its β-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, β-decays and β-delayed protons took place. Beta-delayed γ-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 σ difference between the most precise independent results. Implant–β time correlations, implant–proton time correlations and implant–β–γ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported γ following the β-decay of 71Kr were also identified in the analysis. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

10. Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A~160)

Author

Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Pallàs i Solís, Max, Tarifeño Saldivia, Ariel, Kiss, Gábor Gyula, Taín Enríquez, José Luis, Tolosa Delgado, Alvaro, Vitéz Sveiczer, András, Calviño Tavares, Francisco, Agramunt Ros, Jorge, Aguilera, Patricio, Algora, Alejandro, Allmond, James Mitchell, Cortés Rossell, Guillem Pere, Mont i Geli, Nil, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Pallàs i Solís, Max, Tarifeño Saldivia, Ariel, Kiss, Gábor Gyula, Taín Enríquez, José Luis, Tolosa Delgado, Alvaro, Vitéz Sveiczer, András, Calviño Tavares, Francisco, Agramunt Ros, Jorge, Aguilera, Patricio, Algora, Alejandro, Allmond, James Mitchell, Cortés Rossell, Guillem Pere, and Mont i Geli, Nil

Abstract

At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and ß-delayed neutron-emission probabilities (Pxn). The setup consisted of the BigRIPS in-flight separator for particle identification, the Advanced Implanta- tion Detector Array (AIDA) for ions and ß detection, and the BRIKEN neutron counter for neutron detection. Using this arrangement, 4 new T1/2 and 14 new P1n were measured. Furthermore, 38 T1/2 and 2 P1n values were remeasured, decreasing the uncertainties for some of them. In addition to improving predic- tions of nucleosynthesis models that describe the production of the rare-earth peak at A~160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region., This work has been supported by the Spanish Ministerio de Economía y Competitividad un- der Grants nos. FPA2014-52823-C2-1-P, FPA2014-52823-C2-2-P, FPA2017-83946-C2-1-P, FPA2017-83946-C2-2-P and grants from Ministerio de Ciencia e Innovacion nos PID2019- 104714GB-C21, PID2019-104714GB-C22. It was also supported by NKFIH (NN128072) and by the ÚNKP-22-2 and ÚNKP-22-3 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and In- novation Fund (Project numbers: ÚNKP-22-2-I-DE-75; ÚNKP-22-3-II- DE-132)., Article signat per 61 autors/es: M. Pallàs, A. Tarifeño-Saldivia, G. G. Kiss, J. L. Tain, A. Tolosa- Delgado, A. Vitéz-Sveiczer, F. Calviño, J. Agramunt, P. Aguilera, A. Algora, J. M. Allmond, H. Baba, N. T. Brewer, R. Caballero-Folch, P. J. Coleman-Smith, G. Cortes, T. Davinson, I. Dillmann, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, S. Kubono, M. Labiche, J. Liu, M. Madurga, K. Miernik, F. Molina, N. Mont-Geli, A. I. Morales, E. Nácher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa- Silkowska, V. Phong, B. C. Rasco, J. Romero-Barrientos, B. Rubio, K. P. Rykaczewski, Y. Saito, H. Sakurai, Y. Shimizu, M. Singh, T. Sumikama, H. Suzuki, T. N. Szegedi, H. Takeda, K. Wang, M. Woli´nska-Cichocka, P. J. Woods, and R. Yokoyama for the BRIKEN collaboration., Postprint (published version)

Published
2023

11. Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak

Author

Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Pallàs i Solís, Max, Tarifeño Saldivia, Ariel, Kiss, Gábor Gyula, Taín Enríquez, José Luis, Tolosa Delgado, Alvaro, Vitéz Sveiczer, András, Calviño Tavares, Francisco, Agramunt Ros, Jorge, Aguilera, Patricio, Algora, Alejandro, Allmond, James Mitchell, Baba, H., Mont i Geli, Nil, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Pallàs i Solís, Max, Tarifeño Saldivia, Ariel, Kiss, Gábor Gyula, Taín Enríquez, José Luis, Tolosa Delgado, Alvaro, Vitéz Sveiczer, András, Calviño Tavares, Francisco, Agramunt Ros, Jorge, Aguilera, Patricio, Algora, Alejandro, Allmond, James Mitchell, Baba, H., and Mont i Geli, Nil

Abstract

Half-lifes (T1/2) of exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted of the BigRIPS in-flight separator for ion selection identification, the Advance Implantation Detector Array (AIDA) for ions and ß detection, and the BRIKEN detector for neutron counting. Using this setup, 4 new T1/2 have been measured for the first time, and 38 T1/2 have been remeasured with improved precision in several cases. These new experimental data should help to constrain theoretical models for calculations of T1/2. The status of the experimental analysis and preliminary results are provided in this contribution., This work has been supported by the Spanish Ministerio de Economía y Competitividad under Grants. FPA2014- 52823-C2-1-P, FPA2014-52823-C2-2-P, FPA2017-83946- C2-1-P, FPA2017-83946-C2-2-P and grants from Ministerio de Ciencia e Innovacion PID2019-104714GB-C21, PID2019-104714GB-C22. Supported by Generalitat Valenciana regional grant PROMETEO/2019/007. Supported by European Union FEDER funds. It also has been supported by NKFIH (NN128072)., Article signat per 61 autors/es: M. Pallàs, A. Tarifeño-Saldivia, G. G. Kiss, J. L. Tain, A. Tolosa-Delgado, A. Vitéz- Sveiczer, F. Calviño, J. Agramunt, P. Aguilera, A. Algora, J. M. Allmond, H. Baba, N. T. Brewer, R. Caballero-Folch, P. J. Coleman-Smith, G. Cortes, T. Davinson, I. Dillmann, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, S. Kubono, M. Labiche, J. Liu, M. Madurga, K. Miernik, F. Molina, N. Mont-Geli, A. I. Morales, E. Nácher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Silkowska, V. Phong, B. C. Rasco, J. Romero-Barrientos, B. Rubio, K. P. Rykaczewski, Y. Saito, H. Sakurai, Y. Shimizu, M. Singh, T. Sumikama, H. Suzuki, T. N. Szegedi, H. Takeda, K. Wang, M. Woli´nska-Cichocka, P. J. Woods, and R. Yokoyama for the BRIKEN collaboration., Postprint (published version)

Published
2023

12. The ß-decay of 71Kr: Precise measurement of the half-life

Author

RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), National Research, Development and Innovation Office (Hungary), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Vitéz-Sveiczer, A., Algora, Alejandro, Kiss, G.G., Rubio, Berta, Morales, A. I., Sarriguren, Pedro, Angelis, G. de, Recchia, F., Nishimura, S., Agramunt, Jorge, Guadilla Gómez, Víctor, Montaner-Pizá, A., Orrigo, S. E. A., Horváth, Á., Napoli, D., Lenzi, S., Boso, A., Phong, V., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., France, G. de, Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), National Research, Development and Innovation Office (Hungary), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, Agencia Nacional de Investigación y Desarrollo (Chile), Vitéz-Sveiczer, A., Algora, Alejandro, Kiss, G.G., Rubio, Berta, Morales, A. I., Sarriguren, Pedro, Angelis, G. de, Recchia, F., Nishimura, S., Agramunt, Jorge, Guadilla Gómez, Víctor, Montaner-Pizá, A., Orrigo, S. E. A., Horváth, Á., Napoli, D., Lenzi, S., Boso, A., Phong, V., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornenbal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., France, G. de, Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., and Petrovici, A.

Abstract

The very proton-rich 71Kr isotope was produced through the in-flight fragmentation of 78Kr on a beryllium target at RIKEN ¿ Nishina Center in order to study its ß-decay properties. A stack of double-sided silicon strip detectors, called WAS3ABi, was used as the decay station, where the detection of ion implants, ß-decays and ß-delayed protons took place. Beta-delayed ¿-rays were measured using a system of 84 HPGe detectors, called EURICA, surrounding the decay station. The main goal of the present study was the precise measurement of the half-life of 71Kr, as in the literature there is an almost 10 ¿ difference between the most precise independent results. Implant¿ß time correlations, implant¿proton time correlations and implant¿ß¿¿ time correlations were all used to derive the half-life value, followed by a thorough investigation of systematic uncertainties for each method. As these values were found to be consistent, the weighted average t1/2 = 94.40+19ms is reported as a new half-life value in this work. Furthermore a total of 26 previously unreported ¿ following the ß-decay of 71Kr were also identified in the analysis.

Published
2023

13. Gamow–Teller Beta Decay and Pseudo-SU(4) Symmetry

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Van Isacker, P., Algora, Alejandro, Vitéz-Sveiczer, A., Kiss, G.G., Orrigo, S. E. A., Rubio, Berta, Aguilera, Pablo, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Van Isacker, P., Algora, Alejandro, Vitéz-Sveiczer, A., Kiss, G.G., Orrigo, S. E. A., Rubio, Berta, and Aguilera, Pablo

Abstract

We report on recent experimental results on (Formula presented.) decay into self-conjugate ((Formula presented.)) nuclei with mass number (Formula presented.). Super-allowed (Formula presented.) decays from the (Formula presented.) ground state of a (Formula presented.) parent nucleus are to the isobaric analogue state through so-called Fermi transitions and to (Formula presented.) states by way of Gamow–Teller (GT) transitions. The operator of the latter decay is a generator of Wigner’s SU(4) algebra and as a consequence GT transitions obey selection rules associated with this symmetry. Since SU(4) is progressively broken with increasing A, mainly as a consequence of the spin–orbit interaction, this symmetry is not relevant for the nuclei considered here. We argue, however, that the pseudo-spin–orbit splitting can be small in nuclei with (Formula presented.), in which case nuclear states exhibit an approximate pseudo-SU(4) symmetry. To test this conjecture, GT decay strength is calculated with use of a schematic Hamiltonian with pseudo-SU(4) symmetry. Some generic features of the GT (Formula presented.) decay due to pseudo-SU(4) symmetry are pointed out. The experimentally observed GT strength indicates a restoration of pseudo-SU(4) symmetry for (Formula presented.).

Published
2023

14. Half-life Measurement Using Implant-\((\beta -\gamma )\) Time Correlations in the Region of Neutron-rich Lanthanides

Author

Vitéz-Sveiczer, A., primary, Kovács, S., additional, Kiss, G.G., additional, Saito, Y., additional, Tarifeño-Saldivia, A., additional, Pallas, M., additional, Tain, J.L., additional, Dillmann, I., additional, Agramunt, J., additional, Algora, A., additional, Domingo-Pardo, C., additional, Estrade, A., additional, Appleton, C., additional, Allmond, J.M., additional, Aguilera, P., additional, Baba, H., additional, Brewer, N.T., additional, Bruno, C., additional, Caballero-Folch, R., additional, Calvino, F., additional, Coleman-Smith, P.J., additional, Cortes, G., additional, Davinson, T., additional, Fukuda, N., additional, Ge, Z., additional, Go, S., additional, Griffin, C.J., additional, Grzywacz, R.K., additional, Hall, O., additional, Horváth, A., additional, Ha, J., additional, Harkness-Brennan, L.J., additional, Isobe, T., additional, Kahl, D., additional, King, T.T., additional, Korgul, A., additional, Krücken, R., additional, Kubono, S., additional, Labiche, M., additional, Liu, J., additional, Liang, J., additional, Madurga, M., additional, Miernik, K., additional, Molina, F., additional, Morales, A.I., additional, Mumpower, M.R., additional, Nacher, E., additional, Navarro, A., additional, Nepal, N., additional, Nishimura, S., additional, Piersa-Siłkowska, M., additional, Phong, V., additional, Rasco, B.C., additional, Rubio, B., additional, Rykaczewski, K.P., additional, Romero-Barrientos, J., additional, Sakurai, H., additional, Sexton, L., additional, Shimizu, Y., additional, Singh, M., additional, Sprouse, T., additional, Sumikama, T., additional, Surman, R., additional, Suzuki, H., additional, Szegedi, T.N., additional, Takeda, H., additional, Tolosa-Delgado, A., additional, Wang, K., additional, Wolinska-Cichocka, M., additional, Woods, P., additional, Yokoyama, R., additional, and Xu, Z., additional

Published
2023
Full Text
View/download PDF

15. The -decay of Kr into Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., Van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., and Petrovici, A.

Abstract

The β-decay of the even-even nucleus $^{70}$Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of $^{70}$Kr into $^{70}$Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of $^{70}$Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1$^{+}$ state in comparison with the heaviest Z=N+2 system studied so far ($^{62}$Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.

Published
2022

16. Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Author

Kiss, G. G., primary, Vitéz-Sveiczer, A., additional, Saito, Y., additional, Tarifeño-Saldivia, A., additional, Pallas, M., additional, Tain, J. L., additional, Dillmann, I., additional, Agramunt, J., additional, Algora, A., additional, Domingo-Pardo, C., additional, Estrade, A., additional, Appleton, C., additional, Allmond, J. M., additional, Aguilera, P., additional, Baba, H., additional, Brewer, N. T., additional, Bruno, C., additional, Caballero-Folch, R., additional, Calvino, F., additional, Coleman-Smith, P. J., additional, Cortes, G., additional, Davinson, T., additional, Fukuda, N., additional, Ge, Z., additional, Go, S., additional, Griffin, C. J., additional, Grzywacz, R. K., additional, Hall, O., additional, Horváth, A., additional, Ha, J., additional, Harkness-Brennan, L. J., additional, Isobe, T., additional, Kahl, D., additional, King, T. T., additional, Korgul, A., additional, Kovács, S., additional, Krücken, R., additional, Kubono, S., additional, Labiche, M., additional, Liu, J., additional, Liang, J., additional, Madurga, M., additional, Miernik, K., additional, Molina, F., additional, Morales, A. I., additional, Mumpower, M. R., additional, Nacher, E., additional, Navarro, A., additional, Nepal, N., additional, Nishimura, S., additional, Piersa-Siłkowska, M., additional, Phong, V., additional, Rasco, B. C., additional, Rubio, B., additional, Rykaczewski, K. P., additional, Romero-Barrientos, J., additional, Sakurai, H., additional, Sexton, L., additional, Shimizu, Y., additional, Singh, M., additional, Sprouse, T., additional, Sumikama, T., additional, Surman, R., additional, Suzuki, H., additional, Szegedi, T. N., additional, Takeda, H., additional, Tolosa, A., additional, Wang, K., additional, Wolinska-Cichocka, M., additional, Woods, P., additional, Yokoyama, R., additional, and Xu, Z., additional

Published
2022
Full Text
View/download PDF

17. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., primary, Algora, A., additional, Morales, A.I., additional, Rubio, B., additional, Kiss, G.G., additional, Sarriguren, P., additional, Van Isacker, P., additional, de Angelis, G., additional, Recchia, F., additional, Nishimura, S., additional, Agramunt, J., additional, Guadilla, V., additional, Montaner-Pizá, A., additional, Orrigo, S.E.A., additional, Horváth, A., additional, Napoli, D., additional, Lenzi, S., additional, Boso, A., additional, Phong, V.H., additional, Wu, J., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Ahn, D.S., additional, Baba, H., additional, Doornebal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kubo, T., additional, Kubono, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Sidong, C., additional, Blank, B., additional, Ascher, P., additional, Gerbaux, M., additional, Goigoux, T., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukián Nieto, T., additional, Magron, C., additional, Gelletly, W., additional, Dombrádi, Zs., additional, Fujita, Y., additional, Tanaka, M., additional, Aguilera, P., additional, Molina, F., additional, Eberth, J., additional, Diel, F., additional, Lubos, D., additional, Borcea, C., additional, Ganioglu, E., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Korten, W., additional, de France, G., additional, Davies, P., additional, Liu, J., additional, Lee, J., additional, Lokotko, T., additional, Kojouharov, I., additional, Kurz, N., additional, Shaffner, H., additional, and Petrovici, A., additional

Published
2022
Full Text
View/download PDF

18. Measuring the ß-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Kiss, Gábor Gyula, Vitéz Sveiczer, András, Saito, Yukiya, Tarifeño Saldivia, Ariel Esteban, Pallàs i Solís, Max, Taín Enríquez, José Luis, Dillmann, Iris, Agramunt Ros, Jorge, Algora, A., Domingo Pardo, César, Estrade, A, Appleton, Corrigan, Allmond, James Mitchell, Aguilera, Patricio, Baba, H., Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Kiss, Gábor Gyula, Vitéz Sveiczer, András, Saito, Yukiya, Tarifeño Saldivia, Ariel Esteban, Pallàs i Solís, Max, Taín Enríquez, José Luis, Dillmann, Iris, Agramunt Ros, Jorge, Algora, A., Domingo Pardo, César, Estrade, A, Appleton, Corrigan, Allmond, James Mitchell, Aguilera, Patricio, and Baba, H.

Abstract

The ß-delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes of Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The existing ß-decay half-life (T1/2) database was significantly increased toward more neutron-rich isotopes, and uncertainties for previously measured values were decreased. The new data not only constrain the theoretical predictions of half-lives and ß-delayed neutron-emission probabilities, but also allow for probing the mechanisms of formation of the high-mass wing of the rare-earth peak located at A ˜ 160 in the r-process abundance distribution through astrophysical reaction network calculations. An uncertainty quantification of the calculated abundance patterns with the new data shows a reduction of the uncertainty in the rare-earth peak region. The newly introduced variance-based sensitivity analysis method offers valuable insight into the influence of important nuclear physics inputs on the calculated abundance patterns. The analysis has identified the half-lives of 168Sm and of several gadolinium isotopes as some of the key variables among the current experimental data to understand the remaining abundance uncertainty at A = 167–172., Peer Reviewed, Postprint (published version)

Published
2022

19. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., Ministry of Innovation and Technology (Hungary), Agencia Nacional de Investigación y Desarrollo (Chile), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, QRPA calculations, Kr, Pseudo-SU(4) symmetry, pn pairing, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay of, 70, GT strength distribution, Beta decay of Kr 70 | GT strength distribution | pn pairing | Pseudo-SU(4) symmetry | QRPA calculations
Abstract

8 pags., 4 figs., 1 tab., The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system., This work was supported by the National Research, Development and Innovation Fund of the Ministry for Innovation and Technology, Hungary with project no. TKP2021-NKTA-42 under the TKP2021 funding scheme. FM acknowledges the support of ANID/FONDECYT Regular 1171467 and ANID/FONDECYT Regular 1221364 national projects. This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish MICINN grants FPA2014-52823-C2-1-P, FPA2017- 83946-C2-1-P (MCIU/AEI/FEDER); Ministerio de Ciencia e Innovación grant PID2019-104714GB-C21; Centro de Excelencia Severo Ochoa del IFIC SEV-2014-0398; Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE, by NKFIH (NN128072), the National Research, Development and Innovation Fund of Hungary Project No. K 128729 the STFC (UK) through Grant No. ST/P005314/, the PROMETEO/2019/007 project and by the ÚNKP-20-5-DE-02 New National Excellence Program of the Ministry of Human Capacities of Hungary and by the JSPS KAKENHI of Japan (Grant No. 25247045). G.G. Kiss acknowledges support from the János Bolyai research fellowship of the Hungarian Academy of Sciences. A. A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955) P. S. acknowledges support from MCI/AEI/FEDER,UE (Spain) under grant PGC2018-093636-B-I00.

Published
2022
Full Text
View/download PDF

20. Half-life Measurement Using Implant-\((\beta -\gamma )\) Time Correlations in the Region of Neutron-rich Lanthanides

Author

A. Vitéz-Sveiczer, S. Kovács, G.G. Kiss, Y. Saito, A. Tarifeño-Saldivia, M. Pallas, J.L. Tain, I. Dillmann, J. Agramunt, A. Algora, C. Domingo-Pardo, A. Estrade, C. Appleton, J.M. Allmond, P. Aguilera, H. Baba, N.T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino, P.J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C.J. Griffin, R.K. Grzywacz, O. Hall, A. Horváth, J. Ha, L.J. Harkness-Brennan, T. Isobe, D. Kahl, T.T. King, A. Korgul, R. Krücken, S. Kubono, M. Labiche, J. Liu, J. Liang, M. Madurga, K. Miernik, F. Molina, A.I. Morales, M.R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Siłkowska, V. Phong, B.C. Rasco, B. Rubio, K.P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh, T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T.N. Szegedi, H. Takeda, A. Tolosa-Delgado, K. Wang, M. Wolinska-Cichocka, P. Woods, R. Yokoyama, and Z. Xu

Subjects
General Physics and Astronomy
Published
2023
Full Text
View/download PDF

21. Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)

Author

M. Pallàs, A. Tarifeño-Saldivia, G. G. Kiss, J. L. Tain, A. Tolosa-Delgado, A. Vitéz-Sveiczer, F. Calviño, J. Agramunt, P. Aguilera, A. Algora, J. M. Allmond, H. Baba, N. T. Brewer, R. Caballero-Folch, P. J. Coleman-Smith, G. Cortes, T. Davinson, I. Dillmann, C. Domingo-Pardo, A. Estrade, N. Fukuda, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, S. Kubono, M. Labiche, J. Liu, M. Madurga, K. Miernik, F. Molina, N. Mont-Geli, A. I. Morales, E. Nácher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Silkowska, V. Phong, B. C. Rasco, J. Romero-Barrientos, B. Rubio, K. P. Rykaczewski, Y. Saito, H. Sakurai, Y. Shimizu, M. Singh, T. Sumikama, H. Suzuki, T. N. Szegedi, H. Takeda, K. Wang, M. Wolińska-Cichocka, P. J. Woods, and R. Yokoyama

Subjects
General Medicine
Abstract

At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and β-delayed neutron-emission probabilities (Pxn). The setup consisted of the BigRIPS in-flight separator for particle identification, the Advanced Implantation Detector Array (AIDA) for ions and β detection, and the BRIKEN neutron counter for neutron detection. Using this arrangement, 4 new T1/2 and 14 new P1n were measured. Furthermore, 38 T1/2 and 2 P1n values were remeasured, decreasing the uncertainties for some of them. In addition to improving predictions of nucleosynthesis models that describe the production of the rare-earth peak at A ∼ 160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region.

Published
2023
Full Text
View/download PDF

22. Measuring the β-decay Properties of Neutron-rich Exotic Pm, Sm, Eu, and Gd Isotopes to Constrain the Nucleosynthesis Yields in the Rare-earth Region

Author

G. G. Kiss, A. Vitéz-Sveiczer, Y. Saito, A. Tarifeño-Saldivia, M. Pallas, J. L. Tain, I. Dillmann, J. Agramunt, A. Algora, C. Domingo-Pardo, A. Estrade, C. Appleton, J. M. Allmond, P. Aguilera, H. Baba, N. T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino, P. J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, A. Horváth, J. Ha, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, S. Kovács, R. Krücken, S. Kubono, M. Labiche, J. Liu, J. Liang, M. Madurga, K. Miernik, F. Molina, A. I. Morales, M. R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Siłkowska, V. Phong, B. C. Rasco, B. Rubio, K. P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh, T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T. N. Szegedi, H. Takeda, A. Tolosa, K. Wang, M. Wolinska-Cichocka, P. Woods, R. Yokoyama, Z. Xu, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Doctorat en Enginyeria Nuclear i de les Radiacions Ionitzants, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Física [Àrees temàtiques de la UPC], Space and Planetary Science, Astronomy and Astrophysics, Stars, Nucleosynthesis, Estels, Nucleosíntesi
Abstract

The β-delayed neutron-emission probabilities of 28 exotic neutron-rich isotopes of Pm, Sm, Eu, and Gd were measured for the first time at RIKEN Nishina Center using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The existing β-decay half-life (T 1/2) database was significantly increased toward more neutron-rich isotopes, and uncertainties for previously measured values were decreased. The new data not only constrain the theoretical predictions of half-lives and β-delayed neutron-emission probabilities, but also allow for probing the mechanisms of formation of the high-mass wing of the rare-earth peak located at A ≈ 160 in the r-process abundance distribution through astrophysical reaction network calculations. An uncertainty quantification of the calculated abundance patterns with the new data shows a reduction of the uncertainty in the rare-earth peak region. The newly introduced variance-based sensitivity analysis method offers valuable insight into the influence of important nuclear physics inputs on the calculated abundance patterns. The analysis has identified the half-lives of 168Sm and of several gadolinium isotopes as some of the key variables among the current experimental data to understand the remaining abundance uncertainty at A = 167–172.

Published
2022
Full Text
View/download PDF

23. Studying the Exotic Decay \(^{70}\)Kr \(\rightarrow {}^{70}\)Br

Author

Vitéz-Sveiczer, A., primary, Algora, A., additional, Morales, A.I., additional, Rubio, B., additional, Kiss, G.G., additional, de Angelis, G., additional, Recchia, F., additional, Nishimura, S., additional, Agramunt, J., additional, Guadilla, V., additional, Montaner-Pizá, A., additional, Orrigo, S.E.A., additional, Horváth, A., additional, Napoli, D., additional, Lenzi, S., additional, Boso, A., additional, Phong, V.H., additional, Wu, J., additional, Söderström, P.-A., additional, Sumikama, T., additional, Suzuki, H., additional, Takeda, H., additional, Ahn, D.S., additional, Baba, H., additional, Doornebal, P., additional, Fukuda, N., additional, Inabe, N., additional, Isobe, T., additional, Kubo, T., additional, Kubono, S., additional, Sakurai, H., additional, Shimizu, Y., additional, Chen, S., additional, Blank, B., additional, Ascher, P., additional, Gerbaux, M., additional, Goigoux, T., additional, Giovinazzo, J., additional, Grévy, S., additional, Kurtukián Nieto, T., additional, Magron, C., additional, Gelletly, W., additional, Dombrádi, Zs., additional, Fujita, Y., additional, Tanaka, M., additional, Aguilera, P., additional, Molina, F., additional, Eberth, J., additional, Diel, F., additional, Lubos, D., additional, Borcea, C., additional, Ganioglu, E., additional, Nishimura, D., additional, Oikawa, H., additional, Takei, Y., additional, Yagi, S., additional, Korten, W., additional, de France, G., additional, Davies, P., additional, Liu, J., additional, Lee, J., additional, Lokotko, T., additional, Kojouharov, I., additional, Kurz, N., additional, and Shaffner, H., additional

Published
2020
Full Text
View/download PDF

24. STUDYING THE EXOTIC DECAY 70Kr → 70Br∗.

Author

VITÉZ-SVEICZER, A., ALGORA, A., MORALES, A. I., RUBIO, B., KISS, G. G., DE ANGELIS, G., RECCHIA, F., NISHIMURA, S., AGRAMUNT, J., GUADILLA, V., MONTANER-PIZÁ, A., ORRIGO, S. E. A., HORVÁTH, A., NAPOLI, D., LENZI, S., BOSO, A., PHONG, V. H., WU, J., SÖDERSTRÖM, P.-A., and SUMIKAMA, T.

Subjects
*KRYPTON, *BETA rays, *ISOTOPES
Abstract

Beta-decay of the very neutron-deficient Kr isotope, 70Kr, was studied at RIKEN-RIBF using the EURICA cluster array. The experiment significantly increased our knowledge of the beta-decay of this isotope. Namely, 16 new γ-ray transitions were identified and the half-life was derived from time correlations of the beta particles (tiβ 1/2 = (44.99±0.16) ms) and from thedecaycurvesoftheobserved γ-raytransitions(tiβγ 1/2 = (45.16±0.71) ms), respectively. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

25. Reactor Decay Heat in Pu-239: Solving the gamma Discrepancy in the 4-3000-s Cooling Period

Author

Algora, Alejandro, Jordán Martín, M. Dolores, Taín, José Luis, Rubio, Berta, Agramunt, Jorge, Pérez-Cerdán, Ana Belén, Molina Palacios, Francisco Gabriel, Caballero Ontanaya, Luis, Nácher, Enrique, Krasznahorkay, A., Hunyadi, M. D., Gulyás, J., Vitéz-Sveiczer, A., Csatlós, M., Csige, L., Äystö, Juha, Penttilä, H., Moore, I., Eronen, T., Jokinen, A., Nieminen, A., Hakala, J., Karvonen, P., Kankainen, A., Saastamoinen, A., Rissanen, J., Kessler, T., Weber, C., Ronkainen, J., Rahaman, S., Eloma, V., Rinta-Antila, S., Hager, U., Sonoda, T., Burkard, K., Hueller, W., Batist, L., Gelletly, W., Nichols, A. L., Yoshida, T., Sonzogni, A. A., Peräjärvi, K., Algora, Alejandro, Jordán Martín, M. Dolores, Taín, José Luis, Rubio, Berta, Agramunt, Jorge, Pérez-Cerdán, Ana Belén, Molina Palacios, Francisco Gabriel, Caballero Ontanaya, Luis, Nácher, Enrique, Krasznahorkay, A., Hunyadi, M. D., Gulyás, J., Vitéz-Sveiczer, A., Csatlós, M., Csige, L., Äystö, Juha, Penttilä, H., Moore, I., Eronen, T., Jokinen, A., Nieminen, A., Hakala, J., Karvonen, P., Kankainen, A., Saastamoinen, A., Rissanen, J., Kessler, T., Weber, C., Ronkainen, J., Rahaman, S., Eloma, V., Rinta-Antila, S., Hager, U., Sonoda, T., Burkard, K., Hueller, W., Batist, L., Gelletly, W., Nichols, A. L., Yoshida, T., Sonzogni, A. A., and Peräjärvi, K.

Abstract

The beta feeding probability of Tc-102,Tc- 104,Tc- 105,Tc- 106,Tc- 107, Mo-105, and Nb-101 nuclei, which are important contributors to the decay heat in nuclear reactors, has been measured using the total absorption technique. We have coupled for the first time a total absorption spectrometer to a Penning trap in order to obtain sources of very high isobaric purity. Our results solve a significant part of a long-standing discrepancy in the gamma component of the decay heat for Pu-239 in the 4-3000 s range.

Published
2010

26. First Exploration of Monopole-Driven Shell Evolution above the N=126 Shell Closure: New Millisecond Isomers in ^{213}Tl and ^{215}Tl.

Author

Yeung TT, Morales AI, Wu J, Liu M, Yuan C, Nishimura S, Phong VH, Fukuda N, Tain JL, Davinson T, Rykaczewski KP, Yokoyama R, Isobe T, Niikura M, Podolyák Z, Alcalá G, Algora A, Allmond JM, Agramunt J, Appleton C, Baba H, Caballero-Folch R, Calvino F, Carpenter MP, Dillmann I, Estrade A, Gao T, Griffin CJ, Grzywacz RK, Hall O, Hirayama Y, Hue BM, Ideguchi E, Kiss GG, Kokubun K, Kondev FG, Mizuno R, Mukai M, Nepal N, Nurhafiza MN, Ohta S, Orrigo SEA, Pallàs M, Park J, Rasco BC, Rodríguez-García D, Sakurai H, Sexton L, Shimizu Y, Suzuki H, Vitéz-Sveiczer A, Takeda H, Tarifeno-Saldivia A, Tolosa-Delgado A, Victoria JA, Watanabe YX, and Yap JM

Abstract

Isomer spectroscopy of heavy neutron-rich nuclei beyond the N=126 closed shell has been performed for the first time at the Radioactive Isotope Beam Factory of the RIKEN Nishina Center. New millisecond isomers have been identified at low excitation energies, 985.3(19) keV in ^{213}Tl and 874(5) keV in ^{215}Tl. The measured half-lives of 1.34(5) ms in ^{213}Tl and 3.0(3) ms in ^{215}Tl suggest spins and parities 11/2^{-} with the single proton-hole configuration πh_{11/2} as leading component. They are populated via E1 transitions by the decay of higher-lying isomeric states with proposed spin and parity 17/2^{+}, interpreted as arising from a single πs_{1/2} proton hole coupled to the 8^{+} seniority isomer in the ^{A+1}Pb cores. The lowering of the 11/2^{-} states is ascribed to an increase of the πh_{11/2} proton effective single-particle energy as the second νg_{9/2} orbital is filled by neutrons, owing to a significant reduction of the proton-neutron monopole interaction between the πh_{11/2} and νg_{9/2} orbitals. The new ms isomers provide the first experimental observation of shell evolution in the almost unexplored N>126 nuclear region below doubly magic ^{208}Pb.

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results