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234 results on '"Karayonchev V."'

1. Meaurement of spin vs. TKE of $^{144}$Ba produced in spontaneous fission of $^{252}$Cf

Author

Giha, N. P., Marin, S., Tolstukhin, I. A., Oberling, M. B., Knaack, R. A., Mueller-Gatermann, C., Korichi, A., Bhatt, K., Carpenter, M. P., Fougères, C., Karayonchev, V., Kay, B. P., Lauritsen, T., Seweryniak, D., Watwood, N., Duke, D. L., Mosby, S., Montoya, K. B., Connolly, D. S., Loveland, W., Hernandez, I. E., Clarke, S. D., Pozzi, S. A., and Tovesson, F.

Subjects
Nuclear Experiment
Abstract

We measure the average spin of $^{144}$Ba, a common fragment produced in $^{252}$Cf(sf), as a function of the total kinetic energy (TKE). We combined for the first time a twin Frisch-gridded ionization chamber with a world-class $\gamma$-ray spectrometer that was designed to measure high-multiplicity $\gamma$-ray events, Gammasphere. The chamber, loaded with a $^{252}$Cf(sf) source, provides a fission trigger, the TKE of the fragments, the approximate fragment masses, and the polar angle of the fission axis. Gammasphere provides the total $\gamma$-ray yield, fragment identification through the tagging of decay $\gamma$ rays, and the feeding of rotational bands in the fragments. We determine the dependence of the average spin of $^{144}$Ba on the fragments' TKE by correlating the fragment properties with the distribution of discrete levels that are fed. We find that the average spin only changes by about $0.5$ $\hbar$ across the TKE range of 158-203 MeV. The virtual independence of the spin on TKE suggests that spin is not solely generated through the statistical excitation of rotational modes, and more complex mechanisms are required., Comment: Accepted for publication in Phys. Rev. C

Published
2024

2. Identifying the spin trapped character of the $^{32}$Si isomeric state

Author

Williams, J., Hackman, G., Starosta, K., Lubna, R. S., Choudhary, Priyanka, Srivastava, P. C., Andreoiu, C., Annen, D., Asch, H., Badanage, M. D. H. K. G., Ball, G. C., Beuschlein, M., Bidaman, H., Bildstein, V., Coleman, R., Garnsworthy, A. B., Greaves, B., Leckenby, G., Karayonchev, V., Martin, M. S., Natzke, C., Petrache, C. M., Radich, A., Raleigh-Smith, E., Rhodes, D., Russell, R., Satrazani, M., Spagnoletti, P., Svensson, C. E., Tam, D., Wu, F., Yates, D., and Yu, Z.

Subjects
Nuclear Experiment
Abstract

The properties of a nanosecond isomer in $^{32}$Si, disputed in previous studies, depend on the evolution of proton and neutron shell gaps near the `island of inversion'. We have placed the isomer at 5505.2(2) keV with $J^{\pi} = 5^-$, decaying primarily via an $E3$ transition to the $2^+_1$ state. The $E3$ strength of 0.0841(10) W.u. is unusually small and suggests that this isomer is dominated by the $(\nu d_{3/2})^{-1} \otimes (\nu f_{7/2})^{1}$ configuration, which is sensitive to the $N=20$ shell gap. A newly observed $4^+_1$ state is placed at 5881.4(13) keV; its energy is enhanced by the $Z=14$ subshell closure. This indicates that the isomer is located in a `yrast trap', a feature rarely seen at low mass numbers., Comment: Accepted, Physical Review C

Published
2023

3. α decay of the neutron-deficient isotope At190

Author

Andreyev, AN, Seweryniak, D, Andel, B, Antalic, S, Doherty, DT, Korichi, A, Barton, C, Canete, L, Carpenter, MP, Clark, RM, Copp, PA, Cubiss, JG, Heery, J, Hrabar, Y, Huang, H, Huang, T, Karayonchev, V, Kondev, FG, Lauritsen, T, Liu, Z, Lotay, G, Müller-Gatermann, C, Nandi, S, Page, C, Potterveld, DH, Regan, PH, Reviol, W, Rudolph, D, Siciliano, M, Sidhu, RS, Sitarčík, A, Woods, PJ, Yue, Z, and Zhang, W

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The α decay of the neutron-deficient At190 isotope was observed following the Rh103(Zr90,3n)At190 reaction at Argonne National Laboratory. The reaction products were separated from the beam using the Argonne Gas-Filled Analyzer and implanted into a double-sided Si strip detector. The spatial and temporal correlations between implanted nuclei and subsequent α decays towards the known daughter isotope Bi186 were used to identify and characterize At190 nuclei. Two possible decay scenarios are proposed for the At190→Bi186 decay.

Published
2023

4. Evolution of the isoscalar giant monopole resonance in the Ca isotope chain

Author

Olorunfunmi, S. D., Neveling, R., Carter, J., von Neumann-Cosel, P., Usman, I. T., Adsley, P., Bahini, A., Baloyi, L. P. L., Brümmer, J. W., Donaldson, L. M., Jivan, H., Kheswa, N. Y., Li, K. C. W., Marín-Lámbarri, D. J., Molema, P. T., Moodley, C. S., O'Neill, G. G., Papka, P., Pellegri, L., Pesudo, V., Sideras-Haddad, E., Smit, F. D., Steyn, G. F., Aava, A. A., Diel, F., Dunkel, F., Jones, P., and Karayonchev, V.

Subjects
Nuclear Experiment
Abstract

Two recent studies of the evolution of the isoscalar giant monopole resonance (ISGMR) within the calcium isotope chain report conflicting results. One study suggests that the monopole resonance energy, and thus the incompressibility of the nucleus $K_{A}$ increase with mass, which implies that $K_{\tau}$, the asymmetry term in the nuclear incompressibility, has a positive value. The other study reports a weak decreasing trend of the energy moments, resulting in a generally accepted negative value for $K_{\tau}$. An independent measurement of the central region of the ISGMR in the Ca isotope chain is provided to gain a better understanding of the origin of possible systematic trends. Inelastically scattered $\alpha$ particles from a range of calcium targets ($\mathrm{^{40,42,44,48}Ca}$), observed at small scattering angles including 0$^\circ$, were momentum analyzed in the K600 magnetic spectrometer at iThemba LABS, South Africa. Monopole strengths spanning an excitation-energy range between 9.5 and 25.5 MeV were obtained using the difference-of-spectra (DoS) technique. The structure of the $E0$ strength distributions of $^{40,42,44}$Ca agrees well with the results from the previous measurement that supports a weak decreasing trend of the energy moments, while no two datasets agree in the case of $^{48}$Ca. Despite the variation in the structural character of $E0$ strength distribution from different studies, we find for all datasets that the moment ratios, calculated from the ISGMR strength in the excitation-energy range that defines the main resonance region, display at best only a weak systematic sensitivity to a mass increase. Different trends observed in the nuclear incompressibility are caused by contributions to the $E0$ strength outside of the main resonance region, and in particular for high excitation energies., Comment: 11 pages, 11 figures, submitted to Physical Review C

Published
2022
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5. Search for mixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb

Author

Kocheva D., Stegmann R., Rainovski G., Jolie J., Pietralla N., Stahl C., Petkov P., Blazhev A., Hennig A., Bauer C., Braunroth Th., Carpenter M.P., Cortes L., Dewald A., Djongolov M., Fransen C., Gladnishki K., Janssens R.V.F., Karayonchev V., Lettmann M., Lister C.J., Litzinger J., Möller Th., Möller-Gatermann C., Scheck M., Scholz Ph., Schramm C., Thöle P., Werner V., Wölk D., Zhu S., and Van Isacker P.

Subjects
Physics, QC1-999
Abstract

In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A ≈ 208 region.

Published
2016
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6. Tests of collectivity in $^{98}$Zr by absolute transition rates

Author

Karayonchev, V., Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., Häfner, G., Knafla, L., Litzinger, J., Müller-Gatermann, C., Régis, J. -M., Schomacker, K., Vogt, A., Warr, N., Leviatan, A., and Gavrielov, N.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Lifetimes of low-spin excited states in $^{98}$Zr were measured using the recoil-distance Doppler-shift technique and the Doppler-shift attenuation method. The nucleus of interest was populated in a $^{96}$Zr($^{18}$O,$^{16}$O)$^{98}$Zr two-neutron transfer reaction at the Cologne FN Tandem accelerator. Lifetimes of six low-spin excited states, of which four are unknown, were measured. The deduced $B(E2)$ values were compared with Monte Carlo shell model and interacting boson model with configuration mixing calculations. Both approaches reproduce well most of the data but leave challenging questions regarding the structure of some low lying states., Comment: 13 pages, 12 figures, 3 tables, accepted for publication in Physical Review C

Published
2021
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7. Detailed spectroscopy of doubly magic $^{132}$Sn

Author

Benito, J., Fraile, L. M., Korgul, A., Piersa, M., Adamska, E., Andreyev, A. N., Álvarez-Rodríguez, R., Barzakh, A. E., Benzoni, G., Berry, T., Borge, M. J. G., Carmona, M., Chrysalidis, K., Costache, C., Cubiss, J. G., Goodacre, T. Day, De Witte, H., Fedorov, D. V., Fedosseev, V. N., Fernández-Martínez, G., Fijałkowska, A., Fila, M., Fynbo, H., Galaviz, D., Galve, P., García-Díez, M., Greenlees, P. T., Grzywacz, R., Harkness-Brennan, L. J., Henrich, C., Huyse, M., Ibáñez, P., Illana, A., Janas, Z., Jolie, J., Judson, D. S., Karayonchev, V., Kicinska-Habior, M., Konki, J., Kurcewicz, J., Lazarus, I., Lica, R., López-Montes, A., Lund, M., Mach, H., Madurga, M., Marroquín, I., Marsh, B., Martínez, M. C., Mazzocchi, C., Marginean, N., Marginean, R., Miernik, K., Mihai, C., Mihai, R. E., Nácher, E., Negret, A., Olaizola, B., Page, R. D., Paulauskas, S. V., Pascu, S., Perea, A., Pucknell, V., Rahkila, P., Raison, C., Rapisarda, E., Régis, J. -M., Rezynkina, K., Rotaru, F., Rothe, S., Sánchez-Parcerisa, D., Sánchez-Tembleque, V., Schomacker, K., Simpson, G. S., Sotty, Ch., Stan, L., Stanoiu, M., Stryjczyk, M., Tengblad, O., Turturica, A., Udías, J. M., Van Duppen, P., Vedia, V., Villa-Abaunza, A., Viñals, S., Walters, W. B., Wadsworth, R., and Warr, N.

Subjects
Nuclear Experiment
Abstract

The structure of the doubly magic $^{132}_{50}$Sn$_{82}$ has been investigated at the ISOLDE facility at CERN, populated both by the $\beta^-$decay of $^{132}$In and $\beta^-$-delayed neutron emission of $^{133}$In. The level scheme of $^{132}$Sn is greatly expanded with the addition of 68 $\gamma$-transitions and 17 levels observed for the first time in the $\beta$ decay. The information on the excited structure is completed by new $\gamma$-transitions and states populated in the $\beta$-n decay of $^{133}$In. Improved delayed neutron emission probabilities are obtained both for $^{132}$In and $^{133}$In. Level lifetimes are measured via the Advanced Time-Delayed $\beta\gamma\gamma$(t) fast-timing method. An interpretation of the level structure is given based on the experimental findings and the particle-hole configurations arising from core excitations both from the \textit{N} = 82 and \textit{Z} = 50 shells, leading to positive and negative parity particle-hole multiplets. The experimental information provides new data to challenge the theoretical description of $^{132}$Sn., Comment: 19 pages, 11 figures. Accepted for publication in Phys. Rev. C

Published
2020
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8. Commissioning the FAst TIMing array (FATIMA) at FAIR Phase-0: Half-lives of excited states in the N=50 isotones 96Pd and 94Ru

Author

Jazrawi, S., Yaneva, A., Polettini, M., Das, B., Regan, P.H., Górska, M., Cederwall, B., Jolie, J., Albers, H.M., Chishti, M.M.R., Banerjee, A., Hubbard, N., Mistry, A.K., Rudigier, M., Benzoni, G., Gerl, J., Bruce, A.M., Podolyák, Zs, Nara Singh, B.S., Zhang, G.X., Alhomaidhi, S., Appleton, C., Arici, T., Blazhev, A., Davinson, T., Esmaylzadeh, A., Fraile, L.M., Häfner, G., Hall, O., John, P.R., Karayonchev, V., Koujoharov, I., Kurz, N., Mikolajczuk, M., Pietralla, N., Pietri, S., Regis, J.M., Sahin, E., Sexton, L., Schaffner, H., Scheidenberger, C., Sharma, A., Vesic, J., Weick, H., Werner, V., Lozeva, R., and Si, M.

Published
2022
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9. The DESPEC setup for GSI and FAIR

Author

Mistry, A.K., Albers, H.M., Arıcı, T., Banerjee, A., Benzoni, G., Cederwall, B., Gerl, J., Górska, M., Hall, O., Hubbard, N., Kojouharov, I., Jolie, J., Martinez, T., Podolyák, Zs., Regan, P.H., Tain, J.L., Tarifeno-Saldivia, A., Schaffner, H., Werner, V., Ağgez, G., Agramunt, J., Ahmed, U., Aktas, O., Alcayne, V., Algora, A., Alhomaidhi, S., Amjad, F., Appleton, C., Armstrong, M., Balogh, M., Banerjee, K., Bednarczyk, P., Benito, J., Bhattacharya, C., Black, P., Blazhev, A., Bottoni, S., Boutachkov, P., Bracco, A., Bruce, A.M., Brunet, M., Bruno, C.G., Burrows, I., Calvino, F., Canavan, R.L., Cano-Ott, D., Chishti, M.M.R., Coleman-Smith, P., Cortés, M.L., Cortes, G., Crespi, F., Das, B., Davinson, T., De Blas, A., Dickel, T., Doncel, M., Ertoprak, A., Esmaylzadeh, A., Fornal, B., Fraile, L.M., Galtarossa, F., Gottardo, A., Guadilla, V., Ha, J., Haettner, E., Häfner, G., Heggen, H., Herrmann, P., Hornung, C., Jazrawi, S., John, P.R., Jokinen, A., Jones, C.E., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Knöbel, R., Koseoglou, P., Kosir, G., Kostyleva, D., Kurz, N., Kuzminchuk, N., Labiche, M., Lawson, J., Lazarus, I., Lenzi, S.M., Leoni, S., Llanos-Expósito, M., Lozeva, R., Maj, A., Meena, J.K., Mendoza, E., Menegazzo, R., Mengoni, D., Mertzimekis, T.J., Mikolajczuk, M., Million, B., Mont-Geli, N., Morales, A.I., Morral, P., Mukha, I., Murias, J.R., Nacher, E., Napiralla, P., Napoli, D.R., Nara-Singh, B.S., O’Donnell, D., Orrigo, S.E.A., Page, R.D., Palit, R., Pallas, M., Pellumaj, J., Pelonis, S., Pentilla, H., Pérez de Rada, A., Pérez-Vidal, R.M., Petrache, C.M., Pietralla, N., Pietri, S., Pigliapoco, S., Plaza, J., Polettini, M., Porzio, C., Pucknell, V.F.E., Recchia, F., Reiter, P., Rezynkina, K., Rinta-Antila, S., Rocco, E., Rösch, H.A., Roy, P., Rubio, B., Rudigier, M., Ruotsalainen, P., Saha, S., Şahin, E., Scheidenberger, Ch., Seddon, D.A., Sexton, L., Sharma, A., Si, M., Simpson, J., Smith, A., Smith, R., Söderström, P.A., Sood, A., Soylu, A., Tanaka, Y.K., Valiente-Dobón, J.J., Vasileiou, P., Vasiljevic, J., Vesic, J., Villamarin, D., Weick, H., Wiebusch, M., Wiederhold, J., Wieland, O., Wollersheim, H.J., Woods, P.J., Yaneva, A., Zanon, I., Zhang, G., Zhao, J., Zidarova, R., Zimba, G., and Zyriliou, A.

Published
2022
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10. A revised $B(E2; 2^+_1 \to 0^+_1)$ value in the semi-magic nucleus $^{210}$Po

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Braunroth, Th., Cortés, M. L., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K., Hennig, A., Karayonchev, V., Keatings, J. M., Litzinger, J., Müller-Gatermann, C., Petkov, P., Scheck, M., Spagnoletti, P., Scholz, Ph., Stahl, C., Stegmann, R., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zell, K. O., Van Isacker, P., and Ponomarev, V. Yu.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The lifetimes of the $2^+_1$, the $2^+_2$ and the $3^-_1$ states of $^{210}$Po have been measured in the $^{208}$Pb($^{12}$C,$^{10}$Be)$^{210}$Po transfer reaction by the Doppler-shift attenuation method. The results for the lifetime of the $2^+_1$ state is about three times shorter than the adopted value. However, the new value still does not allow for consistent description of the properties of the yrast $2^+_1$, $4^+_1$, $6^+_1$, and $8^+_1$ states of $^{210}$Po in the framework of nuclear shell models. The Quasi-particle Phonon Model (QPM) calculations also cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2017
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11. Broken seniority symmetry in the semimagic proton mid-shell nucleus Rh95

Author

Das, B., primary, Cederwall, B., additional, Qi, C., additional, Górska, M., additional, Regan, P. H., additional, Aktas, Ö., additional, Albers, H. M., additional, Banerjee, A., additional, Chishti, M. M. R., additional, Gerl, J., additional, Hubbard, N., additional, Jazrawi, S., additional, Jolie, J., additional, Mistry, A. K., additional, Nowacki, F., additional, Polettini, M., additional, Yaneva, A., additional, Ahmed, U., additional, Alhomaidhi, S., additional, Algora, A., additional, Appleton, C., additional, Arici, T., additional, Bagchi, S., additional, Benzoni, G., additional, Benito, J., additional, Blazhev, A., additional, Boutachkov, P., additional, Bracco, A., additional, Bruce, A. M., additional, Brunet, M., additional, Canavan, R., additional, Davinson, T., additional, Dickel, T., additional, Esmaylzadeh, A., additional, Fraile, L. M., additional, Haettner, E., additional, Hall, O., additional, Häfner, G., additional, Heggen, H., additional, Hornung, Ch., additional, Hucka, J. P., additional, John, P. R., additional, Kahl, D., additional, Karayonchev, V., additional, Kern, R., additional, Knöbel, R., additional, Korgul, A., additional, Kosir, G., additional, Kojouharov, I., additional, Kostyleva, D., additional, Kuzminchuk, N., additional, Kurz, N., additional, Liotta, R., additional, Lozeva, R., additional, Mikolajczuk, M., additional, Mukha, I., additional, Napiralla, P., additional, Page, R., additional, Petrache, C. M., additional, Pietralla, N., additional, Pietri, S., additional, Plaß, W. R., additional, Podolyák, Zs., additional, Régis, J.-M., additional, Rudigier, M., additional, Rösch, H., additional, Ruotsalainen, P., additional, Sahin, E., additional, Sánchez-Tembleque, V., additional, Schaffner, H., additional, Scheidenberger, C., additional, Schirru, F., additional, Sexton, L., additional, Singh, B. S. Nara, additional, Sharma, A., additional, Shearman, R., additional, Si, M., additional, Tanaka, Y. K., additional, Vasiljević, J., additional, Vesić, J., additional, Vilhena, J., additional, Weick, H., additional, Wollersheim, H. J., additional, Werner, V., additional, Wiederhold, J., additional, Witt, W., additional, Woods, P. J., additional, Zimba, G., additional, and Zhao, J., additional

Published
2024
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12. High-spin structures in Xe 132 and Xe 133 and evidence for isomers along the N=79 isotones

Author

Vogt, A, Siciliano, M, Birkenbach, B, Reiter, P, Hadyńska-Klȩk, K, Wheldon, C, Valiente-Dobón, JJ, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Blazhev, A, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, De Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Fransen, C, Freeman, SJ, Fu, B, Gadea, A, Gelletly, W, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hetzenegger, R, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Karayonchev, V, Kaya, L, Korten, W, Lee, IY, Leoni, S, Liang, X, Lunardi, S, MacChiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Podolyák, Z, Pollarolo, G, Pullia, A, Queiser, M, Recchia, F, Regan, PH, Régis, JM, Saed-Samii, N, Şahin, E, Scarlassara, F, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, PA, Stefanini, AM, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Warner, DD, Wolf, K, Wu, CY, and Zell, KO

Abstract

The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

Published
2017

13. High-spin structures in Xe132 and Xe133 and evidence for isomers along the N=79 isotones

Author

Vogt, A, Siciliano, M, Birkenbach, B, Reiter, P, Hadyńska-Klęk, K, Wheldon, C, Valiente-Dobón, JJ, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Blazhev, A, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, de Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Fransen, C, Freeman, SJ, Fu, B, Gadea, A, Gelletly, W, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hetzenegger, R, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Karayonchev, V, Kaya, L, Korten, W, Lee, IY, Leoni, S, Liang, X, Lunardi, S, Macchiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Podolyák, Zs, Pollarolo, G, Pullia, A, Queiser, M, Recchia, F, Regan, PH, Régis, J-M, Saed-Samii, N, Şahin, E, Scarlassara, F, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, P-A, Stefanini, AM, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Warner, DD, Wolf, K, Wu, CY, and Zell, KO

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

Published
2017

14. FATIMA — FAst TIMing Array for DESPEC at FAIR

Author

Rudigier, M., Podolyák, Zs., Regan, P.H., Bruce, A.M., Lalkovski, S., Canavan, R.L., Gamba, E.R., Roberts, O., Burrows, I., Cullen, D.M., Fraile, L.M., Gerhard, L., Gerl, J., Gorska, M., Grant, A., Jolie, J., Karayonchev, V., Kurz, N., Korten, W., Lazarus, I.H., Nita, C.R., Pucknell, V.F.E., Régis, J.-M., Schaffner, H., Simpson, J., Singh, P., Townsley, C.M., Smith, J.F., and Vesic, J.

Published
2020
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17. Low collectivity of the first 2⁺ states of ²¹²,²¹⁰Po

Author

Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Bast, M., Beckers, M., Ansari, S., Braunroth, Th., Cappellazzo, M., Cortés, M.L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Spagnoletti, P., Scholz, Ph., Schmidt, T., Spieker, M., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zamora, J.C., Zell, K.O., Van Isacker, P., Ponomarev, V. Yu., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Astier, A., Altenkirch, R., Bast, M., Beckers, M., Ansari, S., Braunroth, Th., Cappellazzo, M., Cortés, M.L., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., Karayonchev, V., Keatings, J.M., Kluge, E., Kröll, Th., Litzinger, J., Moschner, K., Müller-Gatermann, C., Petkov, P., Rudigier, M., Scheck, M., Spagnoletti, P., Scholz, Ph., Schmidt, T., Spieker, M., Stahl, C., Stegmann, R., Stolz, A., Vogt, A., Stoyanova, M., Thöle, P., Warr, N., Werner, V., Witt, W., Wölk, D., Zamora, J.C., Zell, K.O., Van Isacker, P., and Ponomarev, V. Yu.

Abstract

The lifetimes of the first 2⁺ excited states of ²¹²,²¹⁰Po were measured in two transfer reactions ²⁰⁸Pb(¹²C,⁸Be)²¹²Po and ²⁰⁸Pb(¹²C,¹⁰Be)²¹⁰Po by the Recoil Distance Doppler Shift (RDDS) method and by the Doppler Shift Attenuation method (DSAM), respectively. The derived absolute B(E2) values of 2.6(3) W.u. for ²¹²Po and 1.83(28) W.u. for ²¹⁰Po indicate low collectivity. It is shown that the properties of the yrast 2₁⁺, 4₁⁺, 6₁⁺ and 8₁⁺ states in both nuclei cannot be described consistently in the framework of nuclear shell models. It is also demonstrated in the case of ²¹⁰Po that Quasi-particle Phonon Model (QPM) calculations cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.

Published
2024

18. Investigating the prolate-to-oblate shape phase transition: Lifetime measurements and γ spectroscopy of the low-lying negative parity structure in Os193

Author

Knafla, L., primary, Nomura, K., additional, Esmaylzadeh, A., additional, Harter, A., additional, Jolie, J., additional, Karayonchev, V., additional, Kim, Y. H., additional, Köster, U., additional, Ley, M., additional, Michelagnoli, C., additional, Pfeil, A., additional, Régis, J.-M., additional, and von Spee, F., additional

Published
2024
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19. Lifetime measurements of excited states in Mn57

Author

Kleis, H., primary, Arnswald, K., additional, Blazhev, A., additional, Droste, M., additional, Reiter, P., additional, Abels, R., additional, Burggraf, R., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Hirsch, R., additional, Karayonchev, V., additional, Luyken, D., additional, Wehlitz, J., additional, and Werner, D., additional

Published
2023
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20. Lifetime measurements in Rb96 via fast-timing techniques: Investigating shape coexistence at A≃100

Author

Gamba, E. R., primary, Bottoni, S., additional, Iskra, Ł. W., additional, Zavaglia, C., additional, Leoni, S., additional, Fornal, B., additional, Cieplicka-Oryńczak, N., additional, Benzoni, G., additional, Colombi, G., additional, Crespi, F. C. L., additional, Esmaylzadeh, A., additional, Jentschel, M., additional, Jolie, J., additional, Karayonchev, V., additional, Kim, Y. H., additional, Knafla, L., additional, Köster, U., additional, Ley, M., additional, Mǎrginean, N., additional, Mǎrginean, R., additional, Michelagnoli, C., additional, Polettini, M., additional, Porzio, C., additional, Régis, J-.M., additional, Reygadas, D., additional, and Turturica, A., additional

Published
2023
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21. Identifying the spin-trapped character of the Si32 isomeric state

Author

Williams, J., primary, Hackman, G., additional, Starosta, K., additional, Lubna, R. S., additional, Choudhary, Priyanka, additional, Srivastava, P. C., additional, Andreoiu, C., additional, Annen, D., additional, Asch, H., additional, Badanage, M. D. H. K. G., additional, Ball, G. C., additional, Beuschlein, M., additional, Bidaman, H., additional, Bildstein, V., additional, Coleman, R., additional, Garnsworthy, A. B., additional, Greaves, B., additional, Leckenby, G., additional, Karayonchev, V., additional, Martin, M. S., additional, Natzke, C., additional, Petrache, C. M., additional, Radich, A., additional, Raleigh-Smith, E., additional, Rhodes, D., additional, Russell, R., additional, Satrazani, M., additional, Spagnoletti, P., additional, Svensson, C. E., additional, Tam, D., additional, Wu, F., additional, Yates, D., additional, and Yu, Z., additional

Published
2023
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25. Experimental evidence for low-lying quadrupole isovector excitation of 208Po

Author

Yaneva, A., Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Dewald, A., Djongolov, M., Fransen, C., Gladnishki, K. A., Henrich, C., Homm, I., Ide, K. E., John, P. R., Kalaydjieva, D., Karayonchev, V., Kern, R., Kleemann, J., Kröll, Th., Müller-Gatermann, C., Scheck, M., Spagnoletti, P., Stoyanova, M., and Werner, V.

Published
2020
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26. X-ray– γ fast-timing lifetime measurement of the 61+ state in Po206

Author

Stoychev, K., primary, Djongolov, M., additional, Karayonchev, V., additional, Rainovski, G., additional, Ley, M., additional, Jolie, J., additional, Bittner, D., additional, Blazhev, A., additional, Dunkel, F., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Garbe, J., additional, Gerhard, L. M., additional, Gerst, R.-B., additional, Geusen, K., additional, Gladnishki, K. A., additional, Häfner, G., additional, Kalaydjieva, D., additional, Klöckner, L., additional, Knafla, L., additional, Kocheva, D., additional, Kornwebel, L., additional, Müller-Gatermann, C., additional, Nikodem, E., additional, Régis, J.-M., additional, Schomacker, K., additional, and Stoyanova, M., additional

Published
2023
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28. Lifetime measurements in Nb99 and Zr99 : Investigation of shape coexistence

Author

Pfeil, A., Nomura, K., Gavrielov, N., Régis, J.-M., Köster, U., Kim, Y. H., Esmaylzadeh, A., Harter, A., Jolie, J., Knafla, L., Ley, M., Karayonchev, V., Pfeil, A., Nomura, K., Gavrielov, N., Régis, J.-M., Köster, U., Kim, Y. H., Esmaylzadeh, A., Harter, A., Jolie, J., Knafla, L., Ley, M., and Karayonchev, V.

Abstract

The ≈100 mass region is of special interest due to a rapid shape transition, observed by going from neutron number 58 to 60, especially pronounced in the Zr isotopes, where 98Zr is weakly and 100Zr is strongly deformed. To further examine this intricate phenomenon, in this work lifetimes of low-lying excited states in the nuclei 99Zr and 99Nb were determined using fast-timing techniques and an experimental setup consisting of four LaBr3⁢(Ce) detectors. Neutron rich =99 fragments were produced in neutron induced fission and separated by the spectrometer LOHENGRIN at the Institut Laue-Langevin in Grenoble, France. Experimental values are compared to two different calculations in the framework of the interacting boson-fermion model and discussed in the context of shape coexistence.

Published
2023

29. Fast-timing Measurement in \(^{96}\)Pd: Improved Accuracy for the Lifetime of the \(4_1^{+}\) State

Author

Yaneva, A., primary, Jazrawi, S., additional, Das, B., additional, Mikolajczuk, M., additional, Górska, M., additional, Regan, P.H., additional, Cederwall, B., additional, Jolie, J., additional, Benzoni, G., additional, Albers, H.M., additional, Alhomaidhi, S., additional, Arici, T., additional, Banerjee, A., additional, Chishti, M.M.R., additional, Davinson, T., additional, Gerl, J., additional, Hall, O., additional, Hubbard, N., additional, Kojouharov, I., additional, Mistry, A.K., additional, Polettini, M., additional, Rudigier, M., additional, Sahin, E., additional, Schaffner, H., additional, Sharma, A., additional, Wollersheim, H.J., additional, Boutachkov, P., additional, Dickel, T., additional, Haettner, E., additional, Heggen, H., additional, Hornung, Ch., additional, Knöbel, R., additional, Kostyleva, D., additional, Kurz, N., additional, Kuzminchuk, N., additional, Mukha, I., additional, Pietri, S., additional, Plass, W.R., additional, Podolyak, Zs., additional, Scheidenberger, C., additional, Tanaka, Y.K., additional, Vesic, J., additional, Weick, H., additional, Ahmed, U., additional, Aktas, Ö., additional, Algora, A., additional, Appleton, C., additional, Benito, J., additional, Blazhev, A., additional, Bracco, A., additional, Bruce, A., additional, Brunet, M., additional, Canavan, R., additional, Esmaylzadeh, A., additional, Fraile, L.M., additional, Häfner, G., additional, Hucka, K.P., additional, John, P.R., additional, Kahl, D., additional, Karayonchev, V., additional, Kern, R., additional, Kosir, G., additional, Lozeva, R., additional, Napiralla, P., additional, Nara Singh, B.S., additional, Page, R.D., additional, Petrache, C.M., additional, Pietralla, N., additional, Regis, J.-M., additional, Rösch, H., additional, Ruotsalainen, P., additional, Sanchez-Temble, V., additional, Sexton, L., additional, Shearman, R., additional, Si, M., additional, Werner, V., additional, Wiederhold, J., additional, Wimmer, K., additional, Witt, W., additional, Woods, P., additional, and Zimba, G., additional

Published
2023
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30. Investigation of γ softness: Lifetime measurements in Ru104,106

Author

Esmaylzadeh, A., primary, Blazhev, A., additional, Nomura, K., additional, Jolie, J., additional, Beckers, M., additional, Fransen, C., additional, Gerst, R.-B., additional, Harter, A., additional, Karayonchev, V., additional, Knafla, L., additional, Ley, M., additional, and von Spee, F., additional

Published
2022
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32. Decay studies in the A similar to 225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author

Polettini, M, Pellumaj, J, Benzoni, G, Zhang, G, Mengoni, D, Vidal, RM Perez, Genna, D, Bracco, A, Aggez, G, Al Aqueel, M, Alayed, B, Albers, HM, Algora, A, Alhomaidhi, S, Appleton, C, Arici, T, Armstrong, M, Arnswald, K, Balogh, M, Banerjee, A, Blazhev, A, Bottoni, S, Boutachkov, P, Bruce, A, Bruno, C, Camera, F, Cederwall, B, Chishti, MMR, Cox, DM, Crespi, FCL, Das, B, Davinson, T, De Angelis, G, Dickel, T, Doncel, M, Donthi, R, Ertoprak, A, Escudeiro, R, Esmaylzadeh, A, Fraile, LM, Gaffney, L, Gamba, ER, Gerl, J, Gottardo, A, Ha, J, Haettner, E, Hall, O, Heggen, H, Hrabar, Y, Hubbard, N, Jazrawi, S, John, PR, Jolie, J, Jones, C, Joss, D, Judson, D, Kahl, D, Karayonchev, V, Kazantseva, E, Kern, R, Knafla, L, Kojouharov, I, Korgul, A, Korten, W, Koseoglou, P, Kosir, G, Kostyleva, D, Kurtukian-Nieto, T, Kurz, N, Kuzminchuk, N, Labiche, M, Lenzi, S, Leoni, S, Lozeva, R, Mertzimekis, TJ, Mikolajczuk, M, Million, B, Mistry, AK, Morales, A, Mukha, I, Murias, JR, Napoli, D, NaraSingh, BS, O'Donnell, D, Orrigo, SEA, Page, R, Pelonis, S, Petrovic, J, Pietralla, N, Pietri, S, Pigliapoco, S, Podolyak, Zs, Porzio, C, Quintana Arnes, B, Recchia, F, Regan, PH, Reiter, P, Rezynkina, K, Roy, P, Rudigier, M, Ruotsalainen, P, Sahin, E, Sarmiento, LG, Satrazani, M-M, Schaffner, H, Scheidenberger, C, Sexton, L, Sharma, A, Smallcombe, J, Sood, A, Vasileiou, P, Vesic, J, Vilhena, J, Waring, L, Weick, H, Werner, V, Wiederhold, J, Wieland, O, Wimmer, K, Wollersheim, HJ, Woods, P, Yaneva, A, Zanon, I, Zhao, J, Zidarova, R, Ziliani, S, Zimba, G, and Zyriliou, A

Subjects
Science & Technology, Physics, Physical Sciences, Physics, Multidisciplinary
Abstract

ispartof: NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS vol:45 issue:5 status: published

Published
2022

33. New aspects of the low-energy structure of At211

Author

Karayonchev, V., primary, Blazhev, A., additional, Jolie, J., additional, Dewald, A., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Häfner, G., additional, Knafla, L., additional, Müller-Gatermann, C., additional, Rainovski, G., additional, Régis, J.-M., additional, Schomacker, K., additional, and Van Isacker, P., additional

Published
2022
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34. Lifetime measurements in the tungsten isotopes W176,178,180

Author

Harter, A., primary, Knafla, L., additional, Frießner, G., additional, Häfner, G., additional, Jolie, J., additional, Blazhev, A., additional, Dewald, A., additional, Dunkel, F., additional, Esmaylzadeh, A., additional, Fransen, C., additional, Karayonchev, V., additional, Lawless, K., additional, Ley, M., additional, Régis, J.-M., additional, and Zell, K. O., additional

Published
2022
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35. Evolution of the isoscalar giant monopole resonance in the Ca isotope chain

Author

Olorunfunmi, S. D., primary, Neveling, R., additional, Carter, J., additional, von Neumann-Cosel, P., additional, Usman, I. T., additional, Adsley, P., additional, Bahini, A., additional, Baloyi, L. P. L., additional, Brümmer, J. W., additional, Donaldson, L. M., additional, Jivan, H., additional, Kheswa, N. Y., additional, Li, K. C. W., additional, Marín-Lámbarri, D. J., additional, Molema, P. T., additional, Moodley, C. S., additional, O'Neill, G. G., additional, Papka, P., additional, Pellegri, L., additional, Pesudo, V., additional, Sideras-Haddad, E., additional, Smit, F. D., additional, Steyn, G. F., additional, Avaa, A. A., additional, Diel, F., additional, Dunkel, F., additional, Jones, P., additional, and Karayonchev, V., additional

Published
2022
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36. Decay studies in the A∼225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author

Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Perez Vidal, R. M., Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, Maria, Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I., Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I., Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs., Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M.-M., Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V., Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I., Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., Zyriliou, A., Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Perez Vidal, R. M., Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, Maria, Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I., Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I., Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs., Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M.-M., Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V., Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I., Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., and Zyriliou, A.

Abstract

The HISPEC-DESPEC collaboration aims at investigating the structure of exotic nuclei formed in fragmentation reactions with decay spectroscopy measurements, as part of the FAIR Phase-0 campaign at GSI. This paper reports on first results of an experiment performed in spring 2021, with a focus on beta-decaystudies in the Po-Fr nuclei in the 220 < A <230 island of octupole deformation exploiting the DESPEC setup. Ion-beta correlations and fast-timing techniques are being employed, giving an insight into this difficult-to-reach region.

Published
2022
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37. Lifetime measurements in the tungsten isotopes W-176,W-178,W-180

Author

Harter, A., Knafla, L., Friessner, G., Hafner, G., Jolie, J., Blazhev, A., Dewald, A., Dunkel, F., Esmaylzadeh, A., Fransen, C., Karayonchev, V., Lawless, K., Ley, M., Regis, J. -m., Zell, K. O., Harter, A., Knafla, L., Friessner, G., Hafner, G., Jolie, J., Blazhev, A., Dewald, A., Dunkel, F., Esmaylzadeh, A., Fransen, C., Karayonchev, V., Lawless, K., Ley, M., Regis, J. -m., and Zell, K. O.

Abstract

Lifetimes of yrast states in the rare-earth midshell isotopes W-176,W-178,W-180 have been measured with fast-timing methods using the Cologne iron-free Orange spectrometer and the Cologne HORUS spectrometer and with the recoil distance Doppler shift method using the Cologne coincidence plunger setup. Different fusion evaporation reactions have been used to populated excited states in the investigated nuclei. Lifetimes of the 2(1)(+) , 4(1)(+) , 6(1)(+) , and 8(1)(+) yrast states were measured in all three tungsten isotopes and in addition the lifetime of the 10(1)(+) state was measured in W-176. Quadrupole deformation parameters, reduced transition probabilities, and B-4/2 ratios are extracted and discussed in the context of interacting boson model 1 calculations. The results with newly determined signatures largely confirm the investigated tungsten isotopes to be deformed prolate rotors.

Published
2022

38. Investigation of gamma softness: Lifetime measurements in 104,106Ru

Author

Esmaylzadeh, A., Blazhev, A., Nomura, K., Jolie, J., Beckers, M., Fransen, C., Gerst, R. -B., Harter, A., Karayonchev, V., Knafla, L., Ley, M., von Spee, F., Esmaylzadeh, A., Blazhev, A., Nomura, K., Jolie, J., Beckers, M., Fransen, C., Gerst, R. -B., Harter, A., Karayonchev, V., Knafla, L., Ley, M., and von Spee, F.

Abstract

Lifetimes of the 2+1 , 4+1 , 6+1 , 2+gamma, and 3+gamma states in 104,106Ru were measured by using the recoil-distance Doppler -shift technique and the Cologne Plunger device. Low-lying excited states in both nuclei were populated in a 104Ru(18O, 18O) 104Ru* inelastic scattering and in a 104Ru(18O, 16O) 106Ru two-neutron transfer reaction using the Cologne FN Tandem accelerator. The experimental energy levels and deduced electromagnetic transition probabilities are compared in the context of gamma softness and the mapped interacting boson model with input from the microscopic self-consistent mean-field calculation using a Gogny interaction. The newly obtained results for the gamma band give a more detailed insight about the triaxial behavior of 104,106Ru. The results will be discussed in the context of gamma soft and rigid triaxial behavior which is present in the neutron-rich Ru isotopes.

Published
2022

39. Decay studies in the A similar to 225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author

Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Vidal, R. M. Perez, Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, M., Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V, Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I, Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I, Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs, Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M-M, Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V, Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I, Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., Zyriliou, A., Polettini, M., Pellumaj, J., Benzoni, G., Zhang, G., Mengoni, D., Vidal, R. M. Perez, Genna, D., Bracco, A., Aggez, G., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, M., Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V, Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I, Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I, Murias, J. R., Napoli, D., NaraSingh, B. S., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs, Porzio, C., Quintana Arnes, B., Recchia, F., Regan, P. H., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M-M, Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V, Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I, Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., and Zyriliou, A.

Abstract

The HISPEC-DESPEC collaboration aims at investigating the struc-ture of exotic nuclei formed in fragmentation reactions with decay spectroscopymeasurements, as part of the FAIR Phase-0 campaign at GSI. This paper reportson first results of an experiment performed in spring 2021, with a focus on beta-decaystudies in the Po-Fr nuclei in the 220 < A <230 island of octupole deformationexploiting the DESPEC setup. Ion-beta correlations and fast-timing techniques arebeing employed, giving an insight into this difficult-to-reach region.

Published
2022

40. Nature of seniority symmetry breaking in the semimagic nucleus Ru-94

Author

Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P. H., Aktas, O., Albers, H. M., Banerjee, A., Chishti, M. M. R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A. K., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, J., Arici, T., Bagchi, S., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Hornung, Ch, Hucka, J. P., John, P. R., Kojouharov, I, Knoebel, R., Kostyleva, D., Kuzminchuk, N., Mukha, I, Plass, W. R., Singh, B. S. Nara, Vasiljevic, J., Pietri, S., Podolyak, Zs, Rudigier, M., Roesch, H., Sahin, E., Schaffner, H., Scheidenberger, C., Schirru, F., Sharma, A., Shearman, R., Tanaka, Y., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A. M., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Haefner, G., Heggen, H., Kahl, D., Karayonchev, V, Kern, R., Korgu, A., Kosir, G., Kurz, N., Lozeva, R., Mikolajczuk, M., Napiralla, P., Page, R., Petrache, C. M., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P. J., Zimba, G., Das, B., Cederwall, B., Qi, C., Gorska, M., Regan, P. H., Aktas, O., Albers, H. M., Banerjee, A., Chishti, M. M. R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A. K., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, J., Arici, T., Bagchi, S., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, T., Haettner, E., Hall, O., Hornung, Ch, Hucka, J. P., John, P. R., Kojouharov, I, Knoebel, R., Kostyleva, D., Kuzminchuk, N., Mukha, I, Plass, W. R., Singh, B. S. Nara, Vasiljevic, J., Pietri, S., Podolyak, Zs, Rudigier, M., Roesch, H., Sahin, E., Schaffner, H., Scheidenberger, C., Schirru, F., Sharma, A., Shearman, R., Tanaka, Y., Vesic, J., Weick, H., Wollersheim, H. J., Ahmed, U., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A. M., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Haefner, G., Heggen, H., Kahl, D., Karayonchev, V, Kern, R., Korgu, A., Kosir, G., Kurz, N., Lozeva, R., Mikolajczuk, M., Napiralla, P., Page, R., Petrache, C. M., Pietralla, N., Regis, J-M, Ruotsalainen, P., Sexton, L., Sanchez-Temble, V, Si, M., Vilhena, J., Werner, V, Wiederhold, J., Witt, W., Woods, P. J., and Zimba, G.

Abstract

Direct lifetime measurements via gamma -gamma coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N = 50) nucleus Ru-94. The experiment was carried out as the first in a series of FAIR-0 experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in Ru-94 were populated primarily via the beta-delayed proton emission of Pd-95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe-124 beam impinging on a 4 g/cm(2) Be-9 target. While the deduced E2 strength for the 2(+) -> 0(+) transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4(+) -> 2(+) transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the f pg proton hole space with respect to doubly magic Sn-100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority v = 2, I-pi = 4(+) state and that of a close-lying v = 4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6(+) -> 4(+) transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations.

Published
2022

41. New aspects of the low-energy structure of( 211)At

Author

Karayonchev, V., Blazhev, A., Jolie, J., Dewald, A., Esmaylzadeh, A., Fransen, C., Haefner, G., Knafla, L., Mueller-Gatermann, C., Rainovski, G., Regis, J. -m., Schomacker, K., Van Isacker, P., Karayonchev, V., Blazhev, A., Jolie, J., Dewald, A., Esmaylzadeh, A., Fransen, C., Haefner, G., Knafla, L., Mueller-Gatermann, C., Rainovski, G., Regis, J. -m., Schomacker, K., and Van Isacker, P.

Abstract

Lifetimes of low-energy states in the semimagic nucleus 211At were measured employing the recoil-distance Doppler shift and the Doppler-shift attenuation methods. The deduced transition probabilities are compared to two shell-model calculations, one using the modified Kuo-Herling interaction in a multi-j model space and the other using a semiempirical interaction for protons confined to the single-j 0h9/2 orbital. The Kuo-Herling calculations overestimates some of the ground-state transition probabilities, possibly due to contributions not included in the calculated ground-state wave function of 211At. A strong underestimation of the E2 strengths involving the 7/2-1 state is also observed. Therefore, a modification of a single two-body matrix element of the Kuo-Herling interaction is introduced which improves the agreement with the experimental data significantly. The calculations in the single-j approximation agree very well with the measured transition probabilities, indicating that seniority can be regarded as a good quantum number in 211At.

Published
2022

42. Lifetime measurements in the yrast band of Po-212 with a shell-model investigation

Author

Karayonchev, V., Rainovski, G., Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., John, P., Knafla, L., Kocheva, D., Schomacker, K., Werner, V., Naidja, H., Karayonchev, V., Rainovski, G., Jolie, J., Blazhev, A., Dewald, A., Esmaylzadeh, A., Fransen, C., John, P., Knafla, L., Kocheva, D., Schomacker, K., Werner, V., and Naidja, H.

Abstract

The lifetimes of the first excited 4(+) and 6(+ )states in Po-212 were measured using the recoil-distance Doppler shift method. The nucleus of interest was populated in the Pb-208(O-18, C-14)Po- 212 reaction. The experimental results are compared to large-scale shell model calculations performed using the recently developed H208 effective interaction. The calculations describe well the low-lying structure of( 212)Po with an exception of the 2(1)(+) -> 0(1 )(+)transition rate which is strongly overestimated. This has been attributed to additional components in the wave function of the ground state.

Published
2022

43. Nature of seniority symmetry breaking in the semimagic nucleus Ru94

Author

Das, B., primary, Cederwall, B., additional, Qi, C., additional, Górska, M., additional, Regan, P. H., additional, Aktas, Ö., additional, Albers, H. M., additional, Banerjee, A., additional, Chishti, M. M. R., additional, Gerl, J., additional, Hubbard, N., additional, Jazrawi, S., additional, Jolie, J., additional, Mistry, A. K., additional, Polettini, M., additional, Yaneva, A., additional, Alhomaidhi, S., additional, Zhao, J., additional, Arici, T., additional, Bagchi, S., additional, Benzoni, G., additional, Boutachkov, P., additional, Davinson, T., additional, Dickel, T., additional, Haettner, E., additional, Hall, O., additional, Hornung, Ch., additional, Hucka, J. P., additional, John, P. R., additional, Kojouharov, I., additional, Knöbel, R., additional, Kostyleva, D., additional, Kuzminchuk, N., additional, Mukha, I., additional, Plass, W. R., additional, Nara Singh, B. S., additional, Vasiljević, J., additional, Pietri, S., additional, Podolyák, Zs., additional, Rudigier, M., additional, Rösch, H., additional, Sahin, E., additional, Schaffner, H., additional, Scheidenberger, C., additional, Schirru, F., additional, Sharma, A., additional, Shearman, R., additional, Tanaka, Y., additional, Vesić, J., additional, Weick, H., additional, Wollersheim, H. J., additional, Ahmed, U., additional, Algora, A., additional, Appleton, C., additional, Benito, J., additional, Blazhev, A., additional, Bracco, A., additional, Bruce, A. M., additional, Brunet, M., additional, Canavan, R., additional, Esmaylzadeh, A., additional, Fraile, L. M., additional, Häfner, G., additional, Heggen, H., additional, Kahl, D., additional, Karayonchev, V., additional, Kern, R., additional, Korgul, A., additional, Kosir, G., additional, Kurz, N., additional, Lozeva, R., additional, Mikolajczuk, M., additional, Napiralla, P., additional, Page, R., additional, Petrache, C. M., additional, Pietralla, N., additional, Régis, J.-M., additional, Ruotsalainen, P., additional, Sexton, L., additional, Sanchez-Temble, V., additional, Si, M., additional, Vilhena, J., additional, Werner, V., additional, Wiederhold, J., additional, Witt, W., additional, Woods, P. J., additional, and Zimba, G., additional

Published
2022
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44. The DESPEC setup for GSI and FAIR

Author

Mistry, A.K. Albers, H.M. Arıcı, T. Banerjee, A. Benzoni, G. Cederwall, B. Gerl, J. Górska, M. Hall, O. Hubbard, N. Kojouharov, I. Jolie, J. Martinez, T. Podolyák, Z. Regan, P.H. Tain, J.L. Tarifeno-Saldivia, A. Schaffner, H. Werner, V. Ağgez, G. Agramunt, J. Ahmed, U. Aktas, O. Alcayne, V. Algora, A. Alhomaidhi, S. Amjad, F. Appleton, C. Armstrong, M. Balogh, M. Banerjee, K. Bednarczyk, P. Benito, J. Bhattacharya, C. Black, P. Blazhev, A. Bottoni, S. Boutachkov, P. Bracco, A. Bruce, A.M. Brunet, M. Bruno, C.G. Burrows, I. Calvino, F. Canavan, R.L. Cano-Ott, D. Chishti, M.M.R. Coleman-Smith, P. Cortés, M.L. Cortes, G. Crespi, F. Das, B. Davinson, T. De Blas, A. Dickel, T. Doncel, M. Ertoprak, A. Esmaylzadeh, A. Fornal, B. Fraile, L.M. Galtarossa, F. Gottardo, A. Guadilla, V. Ha, J. Haettner, E. Häfner, G. Heggen, H. Herrmann, P. Hornung, C. Jazrawi, S. John, P.R. Jokinen, A. Jones, C.E. Kahl, D. Karayonchev, V. Kazantseva, E. Kern, R. Knafla, L. Knöbel, R. Koseoglou, P. Kosir, G. Kostyleva, D. Kurz, N. Kuzminchuk, N. Labiche, M. Lawson, J. Lazarus, I. Lenzi, S.M. Leoni, S. Llanos-Expósito, M. Lozeva, R. Maj, A. Meena, J.K. Mendoza, E. Menegazzo, R. Mengoni, D. Mertzimekis, T.J. Mikolajczuk, M. Million, B. Mont-Geli, N. Morales, A.I. Morral, P. Mukha, I. Murias, J.R. Nacher, E. Napiralla, P. Napoli, D.R. Nara-Singh, B.S. O'Donnell, D. Orrigo, S.E.A. Page, R.D. Palit, R. Pallas, M. Pellumaj, J. Pelonis, S. Pentilla, H. Pérez de Rada, A. Pérez-Vidal, R.M. Petrache, C.M. Pietralla, N. Pietri, S. Pigliapoco, S. Plaza, J. Polettini, M. Porzio, C. Pucknell, V.F.E. Recchia, F. Reiter, P. Rezynkina, K. Rinta-Antila, S. Rocco, E. Rösch, H.A. Roy, P. Rubio, B. Rudigier, M. Ruotsalainen, P. Saha, S. Şahin, E. Scheidenberger, C. Seddon, D.A. Sexton, L. Sharma, A. Si, M. Simpson, J. Smith, A. Smith, R. Söderström, P.A. Sood, A. Soylu, A. Tanaka, Y.K. Valiente-Dobón, J.J. Vasileiou, P. Vasiljevic, J. Vesic, J. Villamarin, D. Weick, H. Wiebusch, M. Wiederhold, J. Wieland, O. Wollersheim, H.J. Woods, P.J. Yaneva, A. Zanon, I. Zhang, G. Zhao, J. Zidarova, R. Zimba, G. Zyriliou, A.

Abstract

The DEcay SPECtroscopy (DESPEC) setup for nuclear structure investigations was developed and commissioned at GSI, Germany in preparation for a full campaign of experiments at the FRS and Super-FRS. In this paper, we report on the first employment of the setup in the hybrid configuration with the AIDA implanter coupled to the FATIMA LaBr3(Ce) fast-timing array, and high-purity germanium detectors. Initial results are shown from the first experiments carried out with the setup. An overview of the setup and function is discussed, including technical advancements along the path. © 2022 Elsevier B.V.

Published
2022

45. Decay studies in the A ∼ 225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author

Polettini, M., Pellumaj, J., Benzoni, G., Valiente-Dobon, J. J., Zhang, G., Mengoni, D., Vidal, R. M. P., Genna, D., Bracco, A., Aggez, G., Ahmed, U., Aktas, O., Al Aqueel, M., Alayed, B., Albers, H. M., Algora, A., Alhomaidhi, S., Appleton, C., Arici, T., Armstrong, M., Arnswald, K., Balogh, M., Banerjee, A., Garcia, J. B., Blazhev, A., Bottoni, S., Boutachkov, P., Bruce, A., Bruno, C., Camera, F., Cederwall, B., Chishti, M. M. R., Cortes, M. L., Cox, D. M., Crespi, F. C. L., Das, B., Davinson, T., De Angelis, G., Dickel, T., Doncel, M., Donthi, R., Ertoprak, A., Escudeiro, R., Esmaylzadeh, A., Fraile, L. M., Gaffney, L., Gamba, E. R., Gerl, J., Gorska, M., Gottardo, A., Ha, J., Haettner, E., Hall, O., Heggen, H., Hrabar, Y., Hubbard, N., Jazrawi, S., John, P. R., Jolie, J., Jones, C., Joss, D., Judson, D., Kahl, D., Karayonchev, V., Kazantseva, E., Kern, R., Knafla, L., Kojouharov, I., Korgul, A., Korten, W., Koseoglou, P., Kosir, G., Kostyleva, D., Kurtukian-Nieto, T., Kurz, N., Kuzminchuk, N., Labiche, M., Lenzi, S., Leoni, S., Exposito, M. L., Lozeva, R., Mertzimekis, T. J., Mikolajczuk, M., Million, B., Mistry, A. K., Morales, A., Mukha, I., Murias, J. R., Napoli, D., Singh, B. S. N., O'Donnell, D., Orrigo, S. E. A., Page, R., Pelonis, S., Petrovic, J., Pietralla, N., Pietri, S., Pigliapoco, S., Podolyak, Zs., Porzio, C., Arnes, B. Q., Recchia, F., Regan, P. H., Regis, J. -M., Reiter, P., Rezynkina, K., Roy, P., Rudigier, M., Ruotsalainen, P., Sahin, E., Sarmiento, L. G., Satrazani, M. -M., Schaffner, H., Scheidenberger, C., Sexton, L., Sharma, A., Smallcombe, J., Soderstrom, P. -A., Sood, A., Vasileiou, P., Vesic, J., Vilhena, J., Waring, L., Weick, H., Werner, V., Wiederhold, J., Wieland, O., Wimmer, K., Wollersheim, H. J., Woods, P., Yaneva, A., Zanon, I., Zhao, J., Zidarova, R., Ziliani, S., Zimba, G., and Zyriliou, A.

Published
2022

46. Nature of seniority symmetry breaking in the semimagic nucleus $^{94}Ru$

Author

Das, B., Cederwall, B., Qi, C., Górska, M., Regan, P. H., Aktas, Ö., Albers, H. M., Banerjee, A., Chishti, M. M. R., Gerl, J., Hubbard, N., Jazrawi, S., Jolie, J., Mistry, A. K., Polettini, M., Yaneva, A., Alhomaidhi, S., Zhao, Jianwei, Arici, T., Bagchi, S., Benzoni, G., Boutachkov, P., Davinson, T., Dickel, Timo, Haettner, E., Hall, O., Hornung, Ch., Hucka, J. P., John, P. R., Kojouharov, I., Knöbel, R., Kostyleva, D., Kuzminchuk, N., Mukha, I., Plass, W. R., Nara Singh, B. S., Vasiljević, J., Pietri, S., Podolyák, Zs., Rudigier, M., Rösch, H., Sahin, E., Schaffner, H., Scheidenberger, C., Schirru, Fabio, Sharma, A., Shearman, R., Tanaka, Y., Vesić, J., Weick, H., Wollersheim, H. J., Ahmed, U., Algora, A., Appleton, C., Benito, J., Blazhev, A., Bracco, A., Bruce, A. M., Brunet, M., Canavan, R., Esmaylzadeh, A., Fraile, L. M., Häfner, G., Heggen, H., Kahl, D., Karayonchev, V., Kern, R., Korgul, A., Kosir, G., Kurz, N., Lozeva, R., Mikolajczuk, M., Napiralla, P., Page, R., Petrache, C. M., Pietralla, N., Régis, J.-M., Ruotsalainen, P., Sexton, L., Sanchez-Temble, V., Si, M., Vilhena, J., Werner, V., Wiederhold, J., Witt, W., Woods, P. J., and Zimba, G.

Subjects
Nuclear Theory, ddc:530, Nuclear Experiment, ydinfysiikka
Abstract

Physical review / C 105(3), L031304 (2022). doi:10.1103/PhysRevC.105.L031304, Published by APS, Woodbury, NY

Published
2022
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47. Investigation of γ softness: Lifetime measurements in 104,106Ru

Author

Esmaylzadeh, A., Blazhev, A., Nomura, K., Jolie, J., Beckers, M., Fransen, C., Gerst, R. -B., Harter, A., Karayonchev, V., Knafla, L., Ley, M., and von Spee, F.

Subjects
γ softness
Abstract

Lifetimes of the 2+ 1 , 4+ 1 , 6+ 1 , 2+ γ , and 3+ γ states in 104, 106Ru were measured by using the recoil-distance Dopplershift technique and the Cologne Plunger device. Low-lying excited states in both nuclei were populated in a 104Ru(18O, 18O) 104Ru* inelastic scattering and in a 104Ru(18O, 16O) 106Ru two-neutron transfer reaction using the Cologne FN Tandem accelerator. The experimental energy levels and deduced electromagnetic transition probabilities are compared in the context of γ softness and the mapped interacting boson model with input from the microscopic self- consistent mean-field calculation using a Gogny interaction. The newly obtained results for the γ band give a more detailed insight about the triaxial behavior of 104, 106Ru. The results will be discussed in the context of γ soft and rigid triaxial behavior which is present in the neutron- rich Ru isotopes.

Published
2022
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48. New aspects of the low-energy structure of $^{211}\mathrm{At}$

Author

Karayonchev, V., Blazhev, A., Jolie, J., Dewald, A., Esmaylzadeh, A., Fransen, C., Häfner, G., Knafla, L., Müller-Gatermann, C., Rainovski, G., Régis, J.-M., Schomacker, K., van Isacker, P., Grand Accélérateur National d'Ions Lourds (GANIL), and 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)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; Lifetimes of low-energy states in the semimagic nucleus At211 were measured employing the recoil-distance Doppler shift and the Doppler-shift attenuation methods. The deduced transition probabilities are compared to two shell-model calculations, one using the modified Kuo-Herling interaction in a multi-j model space and the other using a semiempirical interaction for protons confined to the single-j 0h9/2 orbital. The Kuo-Herling calculations overestimates some of the ground-state transition probabilities, possibly due to contributions not included in the calculated ground-state wave function of At211. A strong underestimation of the E2 strengths involving the 7/21− state is also observed. Therefore, a modification of a single two-body matrix element of the Kuo-Herling interaction is introduced which improves the agreement with the experimental data significantly. The calculations in the single-j approximation agree very well with the measured transition probabilities, indicating that seniority can be regarded as a good quantum number in At211.

Published
2022
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49. Lifetime measurements to investigate γ softness and shape coexistence in Mo102

Author

Esmaylzadeh, A., Karayonchev, V., Nomura, K., Jolie, J., Beckers, M., Blazhev, A., Dewald, A., Fransen, C., Gerst, R. B., Häfner, G., Harter, A., Knafla, L., Ley, M., Robledo Martín, Luis Miguel, Rodríguez-Guzmán, R., Rudigier, M., and UAM. Departamento de Física Teórica

Subjects
Yrast State, Even-even Nuclei, Física, Coexistence
Abstract

Lifetimes of low-spin excited states in Mo102 populated in a Mo100(O18,O16)Mo102 two-neutron transfer reaction were measured using the recoil-distance Doppler-shift technique at the Cologne FN Tandem accelerator. Lifetimes of the 21+, 41+, 61+, 02+, 2γ+, 3γ+ states and one upper limit for the lifetime of the 4γ+ state were obtained. The energy levels and deduced electromagnetic transition probabilities are compared with those obtained within the mapped interacting boson model framework with microscopic input from Gogny mean-field calculations. With the newly obtained signatures a more detailed insight in the γ softness and shape coexistence in Mo102 is possible and discussed in the context of the Z≈40 and N≈60 region. The nucleus of Mo102 follows the γ soft trend of the Mo isotopes. The properties of the 02+ state indicate, in contrast with the microscopic predictions, shape coexistence which also occurs in other N=60 isotones

Published
2021
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50. Microscopic structure of the one-phonon 2(+) states of Po-208

Author

Kalaydjieva D, Kocheva D, Rainovski G, Karayonchev V, Jolie J, Pietralla N, Beckers M, Blazhev A, Dewald A, Djongolov M, Esmaylzadeh A, Fransen C, Gladnishki KA, Goldkuhle A, Henrich C, Homm I, Ide KE, John PR, Kern R, Kleemann J, Kroll T, Muller-Gatermann C, Scheck M, Spagnoletti P, Stoyanova M, Stoychev K, Werner V, Yaneva A, Dimitrova SS, De Gregorio G, Naidja H, Gargano A, Kalaydjieva, D, Kocheva, D, Rainovski, G, Karayonchev, V, Jolie, J, Pietralla, N, Beckers, M, Blazhev, A, Dewald, A, Djongolov, M, Esmaylzadeh, A, Fransen, C, Gladnishki, Ka, Goldkuhle, A, Henrich, C, Homm, I, Ide, Ke, John, Pr, Kern, R, Kleemann, J, Kroll, T, Muller-Gatermann, C, Scheck, M, Spagnoletti, P, Stoyanova, M, Stoychev, K, Werner, V, Yaneva, A, Dimitrova, S, De Gregorio, G, Naidja, H, and Gargano, A

Published
2021

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