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2. Lifetime measurements of states of S35 , S36 , S37 , and S38 using the AGATA γ -ray tracking spectrometer

Author

Grocutt, L., primary, Chapman, R., additional, Bouhelal, M., additional, Haas, F., additional, Goasduff, A., additional, Smith, J. F., additional, Lubna, R. S., additional, Courtin, S., additional, Bazzacco, D., additional, Braunroth, T., additional, Capponi, L., additional, Corradi, L., additional, Derkx, X., additional, Desesquelles, P., additional, Doncel, M., additional, Fioretto, E., additional, Gottardo, A., additional, Liberati, V., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Mijatović, T., additional, Modamio, V., additional, Montagnoli, G., additional, Montanari, D., additional, Mulholland, K. F., additional, Napoli, D. R., additional, Petrache, C. M., additional, Pipidis, A., additional, Recchia, F., additional, Sahin, E., additional, Singh, P. P., additional, Stefanini, A. M., additional, Szilner, S., additional, and Valiente-Dobón, J. J., additional

Published
2022
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4. Single-particle states and parity doublets in odd-Z Ac-221 and Pa-225 from alpha-decay spectroscopy

Author

Parr, E, Smith, JF, Greenlees, PT, Butler, PA, Auranen, K, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP, Grahn, T, Gregor, ET, Grocutt, L, Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Keatings, JM, Konki, J, Leino, M, McKee, PP, McPeake, C, Mengoni, D, Mistry, AK, Singh, BS Nara, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Spagnoletti, P, Spohr, KM, Stolze, S, Taylor, MJ, and Uusitalo, J

Published
2022

5. Lifetime measurements of states of S-35, S-36, S-37, and S-38 using the AGATA gamma-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V, Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V, Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., Valiente-Dobon, J. J., Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V, Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V, Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., and Valiente-Dobon, J. J.

Abstract

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A = 35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of S-36 ions of energy 225 MeV incident on a thin Pb-208 target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA gamma-ray tracking array was used to detect gamma rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For S-35, the lifetime was determined for the first 1/2(+) state at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of the 3(-) state of S-36 at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6(+)) state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For S-37, the states for which lifetime limits were established were those at 646 keV with J(pi)=3/2(-) and at 2776 keV with J(pi)=11/2(-); there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the J(pi )= (6(+)) state of S-38 at 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; neve

Published
2022

6. Single-particle states and parity doublets in odd- Z Ac221 and Pa225 from α -decay spectroscopy

Author

Parr, E., primary, Smith, J. F., additional, Greenlees, P. T., additional, Butler, P. A., additional, Auranen, K., additional, Chapman, R., additional, Cox, D. M., additional, Cullen, D. M., additional, Gaffney, L. P., additional, Grahn, T., additional, Gregor, E. T., additional, Grocutt, L., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Hodge, D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Keatings, J. M., additional, Konki, J., additional, Leino, M., additional, McKee, P. P., additional, McPeake, C., additional, Mengoni, D., additional, Mistry, A. K., additional, Singh, B. S. Nara, additional, O'Neill, G. G., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scheck, M., additional, Scholey, C., additional, Siciliano, M., additional, Smolen, M., additional, Sorri, J., additional, Spagnoletti, P., additional, Spohr, K. M., additional, Stolze, S., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2022
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7. Single-particle states and parity doublets in odd- Z Ac 221 and Pa 225 from α -decay spectroscopy

Author

Parr, E., Smith, J. F., Greenlees, P. T., Butler, P. A., Auranen, K., Chapman, R., Cox, D. M., Cullen, D. M., Gaffney, L. P., Grahn, T., Gregor, E. T., Grocutt, L., Herzan, A., Herzberg, R. -D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Keatings, J. M., Konki, J., Leino, M., Mckee, P. P., Mcpeake, C., Mengoni, D., Mistry, A. K., Singh, B. S. N., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Spagnoletti, P., Spohr, K. M., Stolze, S., Taylor, M. J., and Uusitalo, J.

Published
2022

8. Single-particle states and parity doublets in odd-Z 221Ac and 225Pa from α-decay spectroscopy

Author

Parr, E., Smith, J. F., Greenlees, P. T., Butler, P. A., Auranen, K., Chapman, R., Cox, D. M., Cullen, D. M., Gaffney, L. P., Grahn, T., Gregor, E. T., Grocutt, L., Herzáň, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Keatings, J. M., Konki, J., Leino, M., McKee, P. P., McPeake, C., Mengoni, D., Mistry, A. K., Nara Singh, B. S., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Spagnoletti, P., Spohr, K. M., Stolze, S., Taylor, M. J., and Uusitalo, J.

Subjects
ydinfysiikka
Abstract

Low-lying states in the odd-Z isotopes 22189Ac132 and 22591Pa134 have been studied using α-particle and αγ-coincidence spectroscopy in the 225Pa→221Ac→217Fr decay chain. Ground-state spin and parity assignments of Iπ = 5/2− are proposed for both 221Ac and 225Pa, with the odd proton occupying the Ω = 5/2 orbital of the quadrupole-octupole deformed shell model in both nuclei. In 221Ac, excited states in the bands based on the Ω = 5/2 and Ω = 3/2 orbitals have been identified, including proposed parity-doublet states. The results suggest that reflection-asymmetric deformation of the ground state persists in the odd-A members of the isotope chains down to N = 132 for Ac and N = 134 for Pa, before reaching the transitional region at N = 130. peerReviewed

Published
2022

9. Lifetime measurements of states of 35S, 36S, 37S, and 38S using the AGATA γ-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatović, Tea, Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, Suzana, and Valiente-Dobon, J. J.

Subjects
nuclear structure, lifetimes, shell model
Abstract

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A=35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV ; the result is compared with a previous published lifetime value. The lifetime of the 3− state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV ; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ=3/2− and at 2776 keV with Jπ=11/2− ; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ=(6+) state of 38S at 3675 keV ; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics ; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.

Published
2022

10. Lifetime measurements of states of S 35, S 36, S 37, and S 38 using the AGATA γ -ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., Valiente-Dobon, J. J., and Capponi, L.

Abstract

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A=35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of the 3− state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ=3/2− and at 2776 keV with Jπ=11/2−; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ=(6+) state of 38S at 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.

Published
2022

12. Excited states in Ra-217 populated in the alpha decay of Th-221

Author

Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Chapman, R, Cullen, DM, Grahn, T, Grocutt, L, Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Stolze, S, Taylor, MJ, and Uusitalo, J

Published
2020

13. Excited states in Ra217 populated in the α decay of Th221

Author

Parr, E., primary, Smith, J. F., additional, Greenlees, P. T., additional, Auranen, K., additional, Chapman, R., additional, Cullen, D. M., additional, Grahn, T., additional, Grocutt, L., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Hodge, D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, McPeake, C., additional, Mengoni, D., additional, Mistry, A. K., additional, Mulholland, K. F., additional, O'Neill, G. G., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scheck, M., additional, Scholey, C., additional, Siciliano, M., additional, Smolen, M., additional, Sorri, J., additional, Stolze, S., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2020
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14. Delayed or absent π(h11/2)2 alignment in Xe 111

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., Boston, A. J., Boston, H. C., Cullen, D. M., Derkx, X., Drummond, M. C., Grahn, T., Greenlees, P. T., Grocutt, L., Hadinia, B., Jakobsson, U., Joss, D. T., Julin, R., Juutinen, S., Labiche, M., Leino, M., Leach, K. G., McPeake, C., Mulholland, K. F., Nieminen, P., O'Donnell, D., Paul, E. S., Peura, P., Sandzelius, M., Sarén, J., Saygi, B., Sorri, J., Stolze, S., Thornthwaite, A., Taylor, M. J., and Uusitalo, J.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Excited states have been identified in the very neutron-deficient N=Z+3 nucleus Xe111 for the first time, using the Ni58(Ni58,αn) heavy-ion fusion-evaporation reaction. γ-ray transitions have been unambiguously assigned to Xe111 by correlation with the characteristic Xe111→Te107→Sn103 α-decay chain using the method of recoil-decay tagging. Inspection of γγ-coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h11/2 neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. The aligned angular momenta for the Xe111 band are constant over the range of observed rotational frequencies, suggesting that the first π(h11/2)2 alignment is either delayed or absent. It is speculated that the alignment of h11/2 protons in the presence of neutrons in near-identical h11/2 orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations.

Published
2020
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15. Delayed or absent pi(h(11/2))(2) alignment in Xe-111

Author

Capponi, L, Smith, JF, Ruotsalainen, P, Scholey, C, Rahkila, P, Bianco, L, Boston, AJ, Boston, HC, Cullen, DM, Derkx, X, Drummond, MC, Grahn, T, Greenlees, PT, Grocutt, L, Hadinia, B, Jakobsson, U, Joss, DT, Julin, R, Juutinen, S, Labiche, M, Leino, M, Leach, KG, McPeake, C, Mulholland, KF, Nieminen, P, O'Donnell, D, Pa, ES ul, Peura, P, Sandzelius, M, Saren, J, Saygi, B, Sorri, J, Stolze, S, Thornthwaite, A, Taylor, MJ, and Uusitalo, J

Published
2020

16. Excited states in Ra 217 populated in the +¦ decay of Th 221

Author

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herz+i+e, A., Herzberg, R. -D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., Mcpeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sar+¬n, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Stolze, S., Taylor, M. J., and Uusitalo, J.

Published
2020

17. Excited states in 217Ra populated in the α decay of 221Th

Author

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzáň, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Konki, J., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Stolze, S., Taylor, M. J., and Uusitalo, J.

Subjects
alpha decay, energy levels and level densities, ydinfysiikka, nuclear structure and decays
Abstract

Fine structure in the α decay of 22190Th, populating excited states in 21788Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from 221Th have been newly observed, with Eα(keV)[bα(%)]=7951(8)[0.14(3)] and 8247(3)[1.51(12)], together with three previously known branches. Also, two new states in 217Ra were identified at E = 177 and 227 keV. The ground-state configurations of the odd-A, N = 131 transitional isotones above 208Pb are interpreted from their α-decay fine structure systematics and considered in terms of predictions using spherical shell and reflection-asymmetric models. peerReviewed

Published
2020

18. Delayed or absent π(h11/2)2 alignment in 111Xe

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., Boston, A. J., Boston, H., Cullen, D. M., Derkx, X., Drummond, M. C., Grahn, T., Greenlees, P. T., Grocutt, L., Hadinia, B., Jakobsson, U., Joss, D. T., Julin, R., Juutinen, S., Labiche, M., Leino, M., Leach, K. G., McPeake, C., Mulholland, K. F., Nieminen, P., O'Donnell, D., Paul, E. S., Peura, P., Sandzelius, M., Sarén, J., Saygi, B., Sorri, J., Stolze, S., Thornthwaite, A., Taylor, M. J., and Uusitalo, J.

Subjects
Nuclear Theory, collective levels, Nuclear Experiment, ydinfysiikka, nuclear structure and decays
Abstract

Excited states have been identified in the very neutron-deficient N = Z + 3 nucleus 111Xe for the first time, using the 58Ni(58Ni, αn) heavy-ion fusion-evaporation reaction. γ -ray transitions have been unambiguously assigned to 111Xe by correlation with the characteristic 111Xe → 107Te → 103Sn α-decay chain using the method of recoil-decay tagging. Inspection of γ γ -coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h11/2 neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. The aligned angular momenta for the 111Xe band are constant over the range of observed rotational frequencies, suggesting that the first π(h11/2 ) 2 alignment is either delayed or absent. It is speculated that the alignment of h11/2 protons in the presence of neutrons in near-identical h11/2 orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations. peerReviewed

Published
2020

19. alpha-decay spectroscopy of the N=130 isotones Ra-218 and Th-220: Mitigation of alpha-particle energy summing with implanted nuclei

Author

Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Butler, PA, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP, Grahn, T, Gregor, ET, Grocutt, L, Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Asztalos, S, Keatings, J, Konki, J, Leino, M, McKee, PP, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, Singh, BS Nara, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Spagnoletti, P, Spohr, KM, Stolze, S, Taylor, MJ, and Uusitalo, J

Published
2019

20. Lifetime measurements of $N{\simeq}20$ phosphorus isotopes using the AGATA ${\gamma}$-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J.F., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatović, T., Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K.F., Napoli, D.R., Petrache, C., Pipidis, A., Recchia, F., Sahin, E., Singh, P.P., Stefanini, A.M., Szilner, S., Valiente-Dobón, J.J., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Laue-Langevin (ILL), ILL, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure
Abstract

International audience; Lifetimes of excited states of the phosphorus isotopes 1533,34,35,36P have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of S36 ions of energy 225 MeV incident on a thin Pb208 target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For P33, lifetime limits were determined for the first 3/2+ and 5/2+ states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2+ state of P34 at 429 keV was determined and compared with earlier measurements. For P35, the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with Jπ values of 3/2+, 5/2+, 7/21−, and 7/22−, respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched π(1f7/2)⊗ν(1f7/2)Jπ=(7+) state of P36 at 5212 keV and a lifetime limit was established for the stretched π(1d3/2)⊗ν(1f7/2)Jπ=(5−) state at 2030 keV. There are no previously published lifetimes for states of P36. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however there is evidence that the shell-model values of the M1 transition rates for the 3/21+→1/2+ (ground state) and 5/21+→3/21+ transitions in P33 underestimate the experimental values by a factor between 5 and 10. In P35 there are some disagreements between experimental and shell-model values of branching ratios for the first and second excited 7/2− states. In particular, there is a serious disagreement for the decay characteristics of the second 7/2− state at 4493 keV, for which the shell-model counterpart lies at 4754 keV. In this case, the shell-model competing electromagnetic decay branches are dominated by E1 and M1 transitions.

Published
2019
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21. α -decay spectroscopy of the N=130 isotones Ra 218 and Th 220: Mitigation of α -particle energy summing with implanted nuclei

Author

Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Butler, PA, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP, Grahn, T, Gregor, ET, Grocutt, L, Herzáň, A, Herzberg, RD, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Keatings, J, Konki, J, Leino, M, McKee, PP, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, Nara Singh, BS, O'Neill, GG, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sarén, J, Scheck, M, Scholey, C, Siciliano, M, Smolen, M, Sorri, J, Spagnoletti, P, Spohr, KM, Stolze, S, Taylor, MJ, and Uusitalo, J

Abstract

An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. Using this technique, α-decay spectroscopy of the N=130 isotones Ra218 (Z=88) and Th220 (Z=90) has been performed. The energies of the α particles emitted in the Ra218→Rn214 and Th220→Ra216 ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of Ra218 and Th220 have been measured to be 25.99(10) μs and 10.4(4) μs, respectively. The half-lives of the ground states of the α-decay daughters, Rn214 and Ra216, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the α decay of Ra218 has been observed for the first time, populating the 695-keV 21+ state in Rn214. The fine-structure α decay has an α-particle energy of 7715(40) keV and branching ratio bα=0.123(11)%.

Published
2019

22. Lifetime measurements of N≃20 phosphorus isotopes using the AGATA γ-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatović, Tea, Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, Suzana, and Valiente-Dobón, J. J.

Subjects
Lifetimes
Abstract

Lifetimes of excited states of the phosphorus isotopes 33 , 34 , 35 , 36 15 P have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of 36 S ions of energy 225 MeV incident on a thin 208 Pb target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ -ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For 33 P , lifetime limits were determined for the first 3/2+ and 5/2+ states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2+ state of 34 P at 429 keV was determined and compared with earlier measurements. For 35 P , the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with Jπ values of 3/2+, 5/2+, 7/2− 1 , and 7/2− 2 , respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched π ( 1 f 7 / 2 ) ⊗ ν ( 1 f 7 / 2 ) J π = ( 7 + ) state of 36 P at 5212 keV and a lifetime limit was established for the stretched π ( 1 d 3 / 2 ) ⊗ ν ( 1 f 7 / 2 ) J π = ( 5 − ) state at 2030 keV. There are no previously published lifetimes for states of 36 P . Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however there is evidence that the shell-model values of the M1 transition rates for the 3/2+1→ 1 / 2 + (ground state) and 5/2+1→ 3 / 2 + 1 transitions in 33 P underestimate the experimental values by a factor between 5 and 10. In 35 P there are some disagreements between experimental and shell-model values of branching ratios for the first and second excited 7/2− states. In particular, there is a serious disagreement for the decay characteristics of the second 7/2− state at 4493 keV, for which the shell-model counterpart lies at 4754 keV. In this case, the shell-model competing electromagnetic decay branches are dominated by E1 and M1 transitions.

Published
2019

23. α-decay spectroscopy of the N = 130 isotones 218Ra and 220Th: Mitigation of α-particle energy summing with implanted nuclei

Author

Parr, E., Smith, J. F., Greenlees, P. T., Auranen, K., Butler, P. A., Chapman, R., Cox, D. M., Cullen, D. M., Gaffney, L. P., Grahn, T., Gregor, E. T., Grocutt, L., Herzán, A., Herzberg, R.-D., Hodge, D., Jakobsson, U., Julin, R., Juutinen, S., Keatings, J., Konki, J., Leino, M., McKee, P. P., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., Singh, B. S. Nara, O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scheck, M., Scholey, C., Siciliano, M., Smolen, M., Sorri, J., Spagnoletti, P., Spohr, K. M., Stolze, S., Taylor, M. J., and Uusitalo, J.

Subjects
nuclear data analysis and compilation, alpha decay, ydinfysiikka, spectrometers and spectroscopic techniques
Abstract

An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. Using this technique, α-decay spectroscopy of the N=130 isotones 218Ra (Z=88) and 220Th (Z=90) has been performed. The energies of the α particles emitted in the 218Ra→214Rn and 220Th→216Ra ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of 218Ra and 220Th have been measured to be 25.99(10) μs and 10.4(4) μs, respectively. The half-lives of the ground states of the α-decay daughters, 214Rn and 216Ra, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the α decay of 218Ra has been observed for the first time, populating the 695-keV 2+1 state in 214Rn. The fine-structure α decay has an α-particle energy of 7715(40) keV and branching ratio bα=0.123(11)%. peerReviewed

Published
2019

24. Delayed or absent π(h11/2)2 alignment in Xe111

Author

Capponi, L., primary, Smith, J. F., additional, Ruotsalainen, P., additional, Scholey, C., additional, Rahkila, P., additional, Bianco, L., additional, Boston, A. J., additional, Boston, H. C., additional, Cullen, D. M., additional, Derkx, X., additional, Drummond, M. C., additional, Grahn, T., additional, Greenlees, P. T., additional, Grocutt, L., additional, Hadinia, B., additional, Jakobsson, U., additional, Joss, D. T., additional, Julin, R., additional, Juutinen, S., additional, Labiche, M., additional, Leino, M., additional, Leach, K. G., additional, McPeake, C., additional, Mulholland, K. F., additional, Nieminen, P., additional, O'Donnell, D., additional, Paul, E. S., additional, Peura, P., additional, Sandzelius, M., additional, Sarén, J., additional, Saygi, B., additional, Sorri, J., additional, Stolze, S., additional, Thornthwaite, A., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2020
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25. α -decay spectroscopy of the N=130 isotones Ra218 and Th220 : Mitigation of α -particle energy summing with implanted nuclei

Author

Parr, E., primary, Smith, J. F., additional, Greenlees, P. T., additional, Auranen, K., additional, Butler, P. A., additional, Chapman, R., additional, Cox, D. M., additional, Cullen, D. M., additional, Gaffney, L. P., additional, Grahn, T., additional, Gregor, E. T., additional, Grocutt, L., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Hodge, D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Keatings, J., additional, Konki, J., additional, Leino, M., additional, McKee, P. P., additional, McPeake, C., additional, Mengoni, D., additional, Mistry, A. K., additional, Mulholland, K. F., additional, Singh, B. S. Nara, additional, O'Neill, G. G., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scheck, M., additional, Scholey, C., additional, Siciliano, M., additional, Smolen, M., additional, Sorri, J., additional, Spagnoletti, P., additional, Spohr, K. M., additional, Stolze, S., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2019
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27. EXILL—a high-efficiency, high-resolution setup for $\gamma$-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., De France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E.Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R.J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Institut Laue-Langevin (ILL), ILL, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Grenoble (INPG), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin ( ILL ), 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 ), Laboratoire de Physique Subatomique et de Cosmologie ( LPSC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Centre de Sciences Nucléaires et de Sciences de la Matière ( CSNSM ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Institut National Polytechnique de Grenoble ( INPG ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Werner, Volker -- 0000-0003-4001-0150, Regnier, David -- 0000-0002-0345-7271, Britton, Richard -- 0000-0001-8532-8504, Cederwall, Bo -- 0000-0003-1771-2656, Valenta, Stanislav -- 0000-0003-2479-1380, Schwengner, Ronald -- 0000-0002-7620-8882, Olaizola, Bruno -- 0000-0003-1604-0640, nannini, adriana -- 0000-0003-0659-7648, Lica, Razvan -- 0000-0001-7066-9787, Petrache, Costel -- 0000-0001-8419-1390, Scheck, Marcus -- 0000-0002-9624-3909, Fraile, Luis M -- 0000-0002-6281-3635, Napoli, Daniel R. -- 0000-0002-8154-6958, Soldner, Torsten -- 0000-0003-2468-5182, GOTTARDO, Andrea -- 0000-0002-0390-5767, Belgya, Tamas -- 0000-0003-4281-5470, Wilson, Emma -- 0000-0003-2695-9853, Clement, Emmanuel -- 0000-0003-1887-717X, de France, Gilles -- 0000-0002-7439-1759, Vedia, Victoria -- 0000-0001-6671-3888, Celikovic, Igor -- 0000-0002-5642-4393, Lozeva, Radomira -- 0000-0002-0024-7068, Lalkovski, Stefan -- 0000-0003-3069-9708, Bottoni, Simone -- 0000-0003-2249-4825, [Jentschel, M. -- Blanc, A. -- Koster, U. -- Mutti, P. -- Soldner, T. -- Urban, W. -- Michelagnoli, C.] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France -- [de France, G. -- Celikovic, I. -- Clement, E. -- Michelagnoli, C.] GANIL, Bvd Becquerel,BP 55027, F-14076 Caen 05, France -- [Leoni, S. -- Benzoni, G. -- Bocchi, G. -- Bottoni, S. -- Crespi, F. -- Million, B. -- Vandone, V.] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy -- [Simpson, G.] Univ Grenoble Alpes, LPSC, F-38026 Grenoble, France -- [Ur, C.] Univ Padua, Dipartimento Fis, Via F Marzolo 8, I-35131 Padua, Italy -- [Ur, C. -- Balabanski, D.] ELI NP, IFIN HH30, Bucharest 077125, Romania -- [Urban, W. -- Czerwinski, M. -- Korgul, A. -- Kurpeta, J. -- Mazzocchi, C.] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland -- [Pfeiffer, M. -- Regis, J. M. -- Saed-Samii, N. -- Thomas, T. -- Warr, N.] Univ Cologne, IKP, Zulpicher Str 77, D-50937 Cologne, Germany -- [Astier, A. -- Konstantinopoulos, T. -- Lozeva, R. -- Petrache, C. -- Zerrouki, T.] Univ Paris Saclay, CNRS, IN2P3, CSNSM, F-91405 Orsay, France -- [Augey, L. -- Guinet, D. -- Redon, N. -- Stezowski, O.] Lyon Univ Claude Bernard, IPN, 43 Blvd 11 Nov 1918, F-69622 Villeurbanne, France -- [Back, T. -- Cederwall, B.] KTH, Phys Dept, Roslagstullsbacken 21, S-10044 Stockholm, Sweden -- [Bajoga, A. -- Britton, R. -- Carroll, R. -- Catford, W. -- Davies, A. -- Lalkovski, S. -- Patel, Z. -- Podolyak, Z. -- Regan, P. -- Rudigier, M. -- Tom, A.] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England -- [Balabanski, D.] INRNE Sofia, 72 Tzarigradsko Shaussee, Sofia 1784, Bulgaria -- [Belgya, T.] Hungarian Acad Sci CER, Konkoly T St 29-33, H-1121 Budapest, Hungary -- [Bernards, C. -- Cooper, N. -- Werner, V.] Yale Univ, Dept Phys, POB 208120, New Haven, CT 06520 USA -- [Biswas, D. C. -- Danu, L. S. -- John, B. V. -- Mukhopadhyay, S.] Bhabha Atom Res Ctr, Nucl Phys Div, Mumbai 400085, Maharashtra, India -- [Bruyneel, B. -- Grente, L. -- Salsac, M. D. -- Zielinska, M.] CEA Saclay ORME Merisiers, DSM IRFU SPHN, Bat 703, F-91191 Gif Sur Yvette, France -- [Burnett, J.] AWE PLC, Reading RG7 4PR, Berks, England -- [Cakirli, R. B.] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey -- [Cieplicka-Oryn'czak, N. -- Szpak, B.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland -- [Csatlos, M. -- Krasznahorkay, A. -- Kuti, I. -- Timar, J. -- Tornyi, T.] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary -- [Curien, D. -- Didierjean, F. -- Duche'ne, G. -- Lozeva, R. -- Sengele, L.] Univ Strasbourg, CNRS, IPHC, UMR 7178, F-67000 Strasbourg, France -- [Drouet, F. -- Vancraeyenest, A.] INPG PHELMA, 3 Parvis Louis Neel BP 257, F-38000 Grenoble 1, France -- [Eberhardt, K. -- Mokry, C. -- Runke, J.] Johannes Gutenberg Univ Mainz, Inst Kernchem, Fritz Strassmann Weg 2, D-55128 Mainz, Germany -- [Erturk, S.] Nigde Univ, Merkez Yerleske Bor Yolu Uzeri, TR-51240 Nigde, Turkey -- [Fraile, L. M. -- Olaizola, B. -- Paziy, V. -- Vedia, V.] Univ Complutense, Grp Fis Nucl, Fis Avda Complutense, Madrid 28040, Spain -- [Gottardo, A. -- Napoli, D. R. -- Wilson, E.] INFN, Lab Nazl Legnaro, Vialle Univ 2, I-35020 Legnaro, Italy -- [Grocutt, L. -- Mulholland, K. -- Scheck, M. -- Smith, J.] Univ West Scotland, High St, Paisley PA1 2BE, Renfrew, Scotland -- [Guerrero, C.] CERN, CH-1211 Geneva 23, Switzerland -- [Hartig, A. -L. -- Henrich, C. -- Ignatov, A. -- Ilieva, S. -- Kroell, T. -- Pietralla, N. -- Thuerauf, M. -- Werner, V.] Tech Univ Darmstadt, IKP, Schlossgartenstr 9, D-64289 Darmstadt, Germany -- [Ivanova, D. -- Kisyov, S.] Univ Sofia, Fac Phys, 5 James Bourchier Blvd, Sofia 1126, Bulgaria -- [John, R. -- Massarczyk, R. -- Schwengner, R.] Helmholtz Zentrum Dresden Rossendorf, POB 510119, D-01314 Dresden, Germany -- [Larijani, C.] Natl Phys Lab, Teddington Queens Rd, Teddington, Middx, England -- [Leguillon, R. -- Orlandi, R.] JAEA, Tokai Shirakata Shirane 2-4 Tokai, Naka, Ibaraki 3191195, Japan -- [Lica, R.] IFIN HH, Bucharest Str Atomistilor 407,POB MG 6, Bucharest 76900, Romania -- [Litaize, O. -- Regnier, D.] CEA Cadarache, F-13108 St Paul Les Durance, France -- [Magron, C.] Univ Bordeaux, CENBG Bordeaux, 1 Le Haut Vigneau, F-33170 Gradignan, France -- [Magron, C.] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Florence, Italy -- [Melon, B.] INFN, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy -- [Ramdhane, M.] LPSC Grenoble, 53 Ave Martyrs, F-38026 Grenoble, France -- [Oliver, R. J.] Univ Brighton, Sch Environm & Technol, Lewes Rd, Brighton, E Sussex BN2 4GJ, England -- [Singh, P.] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India -- [Tomandl, I.] ASCR, Nucl Phys Inst, Rez 25068, Czech Republic -- [Townsley, C.] Univ Sussex, Sch Sci & Technol, Brighton BN1 9QJ, E Sussex, England -- [Tuerler, A.] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland -- [Krticka, M. -- Valenta, S.] Prague Charles Univ, Fac Math & Phys, Ke Karlovu 5, Prague 12116, Czech Republic -- [Vanhoy, J.] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 USA, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Instrumentation for neutron sources, Spectrometers, Physics::Instrumentation and Detectors, Gamma detectors (scintillators, CZT, HPG, HgI etc), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

WOS: 000414625700003, In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., U.S. DOE grant [DE-FG02-91ER40609]; NUPNET; German BMBF [O5P12PKNUF, 05P15RDFN1, 05P12RDNUP]; German DFG contract [KR 1796/2-1]; Polish National Science Centre [DEC-2013/09/B/ST2/03485], This work has been partly supported by the Polish National Science Centre under contract DEC-2013/09/B/ST2/03485, the U.S. DOE grant No. DE-FG02-91ER40609, the NUPNET and the German BMBF under contracts O5P12PKNUF, 05P15RDFN1 and 05P12RDNUP and the German DFG contract KR 1796/2-1.

Published
2017
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28. Lifetime measurements of N similar or equal to 20 phosphorus isotopes using the AGATA gamma-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V, Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V, Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., Valiente-Dobon, J. J., Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V, Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V, Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., and Valiente-Dobon, J. J.

Abstract

Lifetimes of excited states of the phosphorus isotopes P-33, 34, 35, 36(15) have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of S-36 ions of energy 225 MeV incident on a thin Pb-208 target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA gamma-ray tracking array was used to detect gamma-rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For P-33, lifetime limits were determined for the first 3/2(+) and 5/2(+) states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2(+) state of P-34 at 429 keV was determined and compared with earlier measurements. For P-35, the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with J(pi) values of 3/2(+), 5/2(+), 7/2(1)(-) and 7/2(2)(-), respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched pi(1f(7/2)) circle times nu(1f(7/2)) J(pi )= (7(+)) state of P-36 at 5212 keV and a lifetime limit was established for the stretched pi(1d(3/2)) circle times nu(1f(7/2)) J(pi )= (5(-)) state at 2030 keV. There are no previously published lifetimes for states of P-36. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however

Published
2019

29. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Türler, Andreas, Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, 540 Chemistry, 570 Life sciences, biology
Abstract

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 n s−1cm−2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 105 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,γ)28Al and 35Cl(n,γ)36Cl in the energy range from 30 keV up to 10 MeV.

Published
2017
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30. Neutron effective single-particle energies above Ni 78: A hint from lifetime measurements in the N=51 isotones Se 85 and Kr 87

Author

Didierjean, F., Verney, D., Duchãªne, G., Litzinger, J., Sieja, K., Dewald, A., Goasduff, A., Lozeva, R., Fransen, C., De Angelis, G., Aydin, S., Bazzacco, D., Bracco, A., Bottoni, S., Corradi, L., Crespi, F., Ellinger, E., Farnea, E., Fioretto, E., Franchoo, S., Gottardo, A., Grocutt, L., Hackstein, M., Ibrahim, F., Kolos, K., Leoni, S., Lenzi, S., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Mã¶ller, O., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D., Niikura, M., Recchia, F., Sahin, E., Scarlassara, F., Sengele, L., Szilner, S., Smith, J. F., Stefanini, A. M., Ur, C., Valiente-Dobón, J. J., and Vandone, V.

Subjects
Nuclear and High Energy Physics
Published
2017

31. EXILL - a high efficiency, high resolution setup for γ-spectroscopy at an intense cold neutron beam

Author

Jentschel, M., Blanca, A., France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astieri, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka, N., Clement, E., Cooper, N., Crespic, F., Csatlos, M., Czerwinski, M., Danu, L., Davies, A., Didierjean, F., Drouet, F., Duchene, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B., John, R., Jolie, J., Kisyov, S., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kutiu, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Magron, C., Mancuso, C., Ruiz Martinez, E., Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsacq, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timaru, J., Toml, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
235U, Ge detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, neutron-induced fission, multiple-γ coincidences, (n,γ)-reactions, 241Pu, angular correlations
Abstract

In the EXILL campaign a highly efficient array of HPGe detectors was operated at the cold neutron beam instrument PF1B of the Institut Laue-Langevin to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 s-1 cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two smaller clover detectors. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The trigger-less acquisition system allowed an event collection rate of up to 6 × 105 Hz. From triggerless collected data it was possible to construct decay schemes and in combination with the FATIMA array of LaBr3 detectors to analyze half-lives of excited levels in the pico- to micro-second range. Precise energy and efficiency calibrations of EXILL were performed using 27Al(n,γ)28Al and 35Cl(n,γ)36Cl reactions in the energy range from 30 keV up to 10 MeV.

Published
2017

32. Identification of the J = 1− state in 218Ra populated via decay of 222Th

Author

Parr, Edward, Smith, J.F., Greenlees, P.T., Smolen, M., Papadakis, P., Auranen, K., Chapman, R, Cullen, David, Grahn, T, Grocutt, L., Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R., Juutinen, S, Konki, J, Leino, M, McPeake, C. G., Mengoni, D., Mistry, A, Mulholland, K. F., O'Neill, G.G., Pakarinen, J, Partanen, J., Peura, P, Rahkila, P., Ruotsalainen, P, Sandzelius, M., Saren, J., Scheck, M, Scholey, C., Sorri, J., Stolze, S., Taylor, Michael J, and Uusitalo, J.

Subjects
Nuclear Theory
Abstract

The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

Published
2016
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33. Identification of the J(pi)=1(-) state in Ra-218 populated via alpha decay of Th-222

Author

Parr, E, Smith, JF, Greenlees, PT, Smolen, M, Papadakis, P, Auranen, K, Chapman, R, Cullen, DM, Grahn, T, Grocutt, L, Herzan, A, Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R, Juutinen, S, Konki, J, Leino, M, McPeake, C, Mengoni, D, Mistry, AK, Mulholland, KF, O'Neill, GG, Pakarinen, J, Partanen, J, Peura, P, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Saren, J, Scheck, M, Scholey, C, Sorri, J, Stolze, S, Taylor, MJ, and Uusitalo, J

Subjects
Nuclear Theory, Physical Sciences, Fysik
Abstract

The alpha decay of Th-222 populating the low-lying J(pi) = 3(-) state, and also a proposed 1(-) state, in Ra-218 has been observed. The observations suggest an excitation energy of 853 keV for the 1(-) state, which is 60 keV above the 3(-) state. The hindrance factors of these alpha decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the J(pi) = 1(-) and 3(-) states suggest they are produced by an octupole-vibrational mechanism, as opposed to alpha clustering or rotations of a reflection-asymmetric octupole-deformed shape. QC 20160819

Published
2016

34. Identification of the Jπ = 1− state in 218Ra populated via α decay of 222Th

Author

Parr, E., Smith, J. F., Greenlees, Paul, Smolen, M., Papadakis, Philippos, Auranen, Kalle, Chapman, R., Cullen, D. M., Grahn, Tuomas, Grocutt, L., Herzan, Andrej, Herzberg, R.-D., Hodge, D., Jakobsson, Ulrika, Julin, Rauno, Juutinen, Sakari, Konki, Joonas, Leino, Matti, McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, Janne, Partanen, Jari, Peura, Pauli, Rahkila, Panu, Ruotsalainen, Panu, Sandzelius, Mikael, Sarén, Jan, Scheck, M., Scholey, Catherine, Sorri, Juha, Stolze, Sanna, Taylor, M. J., and Uusitalo, Juha

Subjects
radium, Nuclear Theory, octupole correlations, deformed nuclei, torium, excited states
Abstract

The α decay of 222Th populating the low-lying J π = 3− state, and also a proposed 1− state, in 218Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the J π = 1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape. peerReviewed

Published
2016

35. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., primary, Blanc, A., additional, de France, G., additional, Köster, U., additional, Leoni, S., additional, Mutti, P., additional, Simpson, G., additional, Soldner, T., additional, Ur, C., additional, Urban, W., additional, Ahmed, S., additional, Astier, A., additional, Augey, L., additional, Back, T., additional, Ba̧czyk, P., additional, Bajoga, A., additional, Balabanski, D., additional, Belgya, T., additional, Benzoni, G., additional, Bernards, C., additional, Biswas, D.C., additional, Bocchi, G., additional, Bottoni, S., additional, Britton, R., additional, Bruyneel, B., additional, Burnett, J., additional, Cakirli, R.B., additional, Carroll, R., additional, Catford, W., additional, Cederwall, B., additional, Celikovic, I., additional, Cieplicka-Oryńczak, N., additional, Clement, E., additional, Cooper, N., additional, Crespi, F., additional, Csatlos, M., additional, Curien, D., additional, Czerwiński, M., additional, Danu, L.S., additional, Davies, A., additional, Didierjean, F., additional, Drouet, F., additional, Duchêne, G., additional, Ducoin, C., additional, Eberhardt, K., additional, Erturk, S., additional, Fraile, L.M., additional, Gottardo, A., additional, Grente, L., additional, Grocutt, L., additional, Guerrero, C., additional, Guinet, D., additional, Hartig, A.-L., additional, Henrich, C., additional, Ignatov, A., additional, Ilieva, S., additional, Ivanova, D., additional, John, B.V., additional, John, R., additional, Jolie, J., additional, Kisyov, S., additional, Krticka, M., additional, Konstantinopoulos, T., additional, Korgul, A., additional, Krasznahorkay, A., additional, Kröll, T., additional, Kurpeta, J., additional, Kuti, I., additional, Lalkovski, S., additional, Larijani, C., additional, Leguillon, R., additional, Lica, R., additional, Litaize, O., additional, Lozeva, R., additional, Magron, C., additional, Mancuso, C., additional, Martinez, E. Ruiz, additional, Massarczyk, R., additional, Mazzocchi, C., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Mokry, C., additional, Mukhopadhyay, S., additional, Mulholland, K., additional, Nannini, A., additional, Napoli, D.R., additional, Olaizola, B., additional, Orlandi, R., additional, Patel, Z., additional, Paziy, V., additional, Petrache, C., additional, Pfeiffer, M., additional, Pietralla, N., additional, Podolyak, Z., additional, Ramdhane, M., additional, Redon, N., additional, Regan, P., additional, Regis, J.M., additional, Regnier, D., additional, Oliver, R. J., additional, Rudigier, M., additional, Runke, J., additional, Rza̧ca-Urban, T., additional, Saed-Samii, N., additional, Salsac, M.D., additional, Scheck, M., additional, Schwengner, R., additional, Sengele, L., additional, Singh, P., additional, Smith, J., additional, Stezowski, O., additional, Szpak, B., additional, Thomas, T., additional, Thürauf, M., additional, Timar, J., additional, Tom, A., additional, Tomandl, I., additional, Tornyi, T., additional, Townsley, C., additional, Tuerler, A., additional, Valenta, S., additional, Vancraeyenest, A., additional, Vandone, V., additional, Vanhoy, J., additional, Vedia, V., additional, Warr, N., additional, Werner, V., additional, Wilmsen, D., additional, Wilson, E., additional, Zerrouki, T., additional, and Zielinska, M., additional

Published
2017
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36. Neutron effective single-particle energies above Ni78 : A hint from lifetime measurements in the N=51 isotones Se85 and Kr87

Author

Didierjean, F., primary, Verney, D., additional, Duchêne, G., additional, Litzinger, J., additional, Sieja, K., additional, Dewald, A., additional, Goasduff, A., additional, Lozeva, R., additional, Fransen, C., additional, de Angelis, G., additional, Aydin, S., additional, Bazzacco, D., additional, Bracco, A., additional, Bottoni, S., additional, Corradi, L., additional, Crespi, F., additional, Ellinger, E., additional, Farnea, E., additional, Fioretto, E., additional, Franchoo, S., additional, Gottardo, A., additional, Grocutt, L., additional, Hackstein, M., additional, Ibrahim, F., additional, Kolos, K., additional, Leoni, S., additional, Lenzi, S., additional, Lunardi, S., additional, Menegazzo, R., additional, Mengoni, D., additional, Michelagnoli, C., additional, Mijatovic, T., additional, Modamio, V., additional, Möller, O., additional, Montagnoli, G., additional, Montanari, D., additional, Morales, A. I., additional, Napoli, D., additional, Niikura, M., additional, Recchia, F., additional, Sahin, E., additional, Scarlassara, F., additional, Sengele, L., additional, Szilner, S., additional, Smith, J. F., additional, Stefanini, A. M., additional, Ur, C., additional, Valiente-Dobón, J. J., additional, and Vandone, V., additional

Published
2017
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37. EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Abstract

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., QC 20171121

Published
2017
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38. Neutron effective single-particle energies above Ni-78: A hint from lifetime measurements in the N = 51 isotones Se-85 and Kr-87

Author

Didierjean, F., Verney, D., Duchene, G., Litzinger, J., Sieja, K., Dewald, A., Goasduff, A., Lozeva, R., Fransen, C., de Angelis, G., Aydin, S., Bazzacco, D., Bracco, A., Bottoni, S., Corradi, L., Crespi, F., Ellinger, E., Farnea, E., Fioretto, E., Franchoo, S., Gottardo, A., Grocutt, L., Hackstein, M., Ibrahim, F., Kolos, K., Leoni, S., Lenzi, S., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Moeller, O., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D., Niikura, M., Recchia, F., Sahin, E., Scarlassara, F., Sengele, L., Szilner, S., Smith, J. F., Stefanini, A. M., Ur, C., Valiente-Dobon, J. J., Vandone, V., Didierjean, F., Verney, D., Duchene, G., Litzinger, J., Sieja, K., Dewald, A., Goasduff, A., Lozeva, R., Fransen, C., de Angelis, G., Aydin, S., Bazzacco, D., Bracco, A., Bottoni, S., Corradi, L., Crespi, F., Ellinger, E., Farnea, E., Fioretto, E., Franchoo, S., Gottardo, A., Grocutt, L., Hackstein, M., Ibrahim, F., Kolos, K., Leoni, S., Lenzi, S., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Moeller, O., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D., Niikura, M., Recchia, F., Sahin, E., Scarlassara, F., Sengele, L., Szilner, S., Smith, J. F., Stefanini, A. M., Ur, C., Valiente-Dobon, J. J., and Vandone, V.

Abstract

Background: While the N = 50 shell-gap evolution towards Ni-78 is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the Ni-78 core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the vlg(7/2)effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the Ni-78 region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2(1)(-) states in Kr-87 and Se-85 are used to investigate the vlg7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones Se-85 and Kr-87 were populated via multinucleon transfer reactions, using a Se-82 beam and a U-238 target at the LNL tandem-ALPI facility. The prompt y rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain (tau(7/21+)) = 0.4(-0.4)(+1.6) ps for Kr-87. In the case of Se-85 an upper limit of 3(2) ps is obtained for the (tau(7/21+)) value. Conclusion: For Kr-87, the measured (7/2(1)(+)) lifetime is consistent with a core-coupled 2(+) circle times v2d(5/2) configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For Se-85, the measured (7/2(1)(+)) lifetime limit indicates a very small contribution of the vlg(7/2) configuration to the wave function of this state.

Published
2017

39. Identification of the J(pi)=1(-) state in Ra-218 populated via alpha decay of Th-222

Author

Parr, E., Smith, J. F., Greenlees, P. T., Smolen, M., Papadakis, P., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzan, A., Herzberg, R. -D, Hodge, D., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Leino, M., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scheck, M., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Uusitalo, J., Parr, E., Smith, J. F., Greenlees, P. T., Smolen, M., Papadakis, P., Auranen, K., Chapman, R., Cullen, D. M., Grahn, T., Grocutt, L., Herzan, A., Herzberg, R. -D, Hodge, D., Jakobsson, Ulrika, Julin, R., Juutinen, S., Konki, J., Leino, M., McPeake, C., Mengoni, D., Mistry, A. K., Mulholland, K. F., O'Neill, G. G., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scheck, M., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., and Uusitalo, J.

Abstract

The alpha decay of Th-222 populating the low-lying J(pi) = 3(-) state, and also a proposed 1(-) state, in Ra-218 has been observed. The observations suggest an excitation energy of 853 keV for the 1(-) state, which is 60 keV above the 3(-) state. The hindrance factors of these alpha decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the J(pi) = 1(-) and 3(-) states suggest they are produced by an octupole-vibrational mechanism, as opposed to alpha clustering or rotations of a reflection-asymmetric octupole-deformed shape., QC 20160819

Published
2016
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40. Direct observation of theBa114→Xe110→Te106→Sn102tripleα-decay chain using position and time correlations

Author

Capponi, L., primary, Smith, J. F., additional, Ruotsalainen, P., additional, Scholey, C., additional, Rahkila, P., additional, Auranen, K., additional, Bianco, L., additional, Boston, A. J., additional, Boston, H. C., additional, Cullen, D. M., additional, Derkx, X., additional, Drummond, M. C., additional, Grahn, T., additional, Greenlees, P. T., additional, Grocutt, L., additional, Hadinia, B., additional, Jakobsson, U., additional, Joss, D. T., additional, Julin, R., additional, Juutinen, S., additional, Labiche, M., additional, Leino, M., additional, Leach, K. G., additional, McPeake, C., additional, Mulholland, K. F., additional, Nieminen, P., additional, O'Donnell, D., additional, Paul, E. S., additional, Peura, P., additional, Sandzelius, M., additional, Sarén, J., additional, Saygi, B., additional, Sorri, J., additional, Stolze, S., additional, Thornthwaite, A., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2016
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41. Identification of theJπ=1−state inRa218populated viaαdecay ofTh222

Author

Parr, E., primary, Smith, J. F., additional, Greenlees, P. T., additional, Smolen, M., additional, Papadakis, P., additional, Auranen, K., additional, Chapman, R., additional, Cullen, D. M., additional, Grahn, T., additional, Grocutt, L., additional, Herzáň, A., additional, Herzberg, R.-D., additional, Hodge, D., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Konki, J., additional, Leino, M., additional, McPeake, C., additional, Mengoni, D., additional, Mistry, A. K., additional, Mulholland, K. F., additional, O'Neill, G. G., additional, Pakarinen, J., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Scheck, M., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Taylor, M. J., additional, and Uusitalo, J., additional

Published
2016
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42. Experimental study of neutron-rich nuclei near the N = 82 closed shell using the 40 96 Zr + 50 124 Sn reaction with GASP and PRISMA-CLARA arrays

Author

Rodríguez, W., Torres, D. A., Cristancho, F., Medina, N.H., Chapman, R., Smith, J.F., Mengoni, D., Truesdale, V., Grocutt, L., Mulholland, K., Kumar, V., Hadinia, B., Labiche, M., Liang, X., O'Donell, D., Ollier, J., Orlandi, R., Spohr, K.M., Wady, P., Wang, Z.M., Gadea, A., Ur, C.A., Lenzi, S.M., Capponi, L., Michelangnoli, C., Bazzacco, D., Beghini, S., Mărginean, R., Montagnoli, G., Recchia, F., Scarlassara, F., Lunardi, S., Kröll, T., Napoli, D.R., Corradi, L., Fioretto, E., de Angelis, G., Mărginean, N., Sahin, E., Stefanini, A.M., Valiente-Dobon, J.J., Vedova, F.D., Axiotis, M., Martinez, T., Szilner, Suzana, Freeman, S.J., Smith, A.G., Jones, G., Thompson, N., Pollarolo, G., and Manfredo Harri Tabacniks , José Roberto Brandão de Oliveira , Julian Marco Barbosa Shorto and Renato Higa

Subjects
spectrometer, nuclear structure
Abstract

In this contribution an experimental study of the deep-inelastic reaction 96 40Zr+124 50 Sn at 530 MeV, using the GASP and PRISMA-CLARA arrays, is presented. The experiments populate a wealth of projectile-like and target-like binary fragments, in a large neutron-rich region around N ≥ 50 and Z ≈ 40. Preliminary results on the study of the yrast and near-yrast states for 95Nb will be shown, along with a comparison of the experimental yields obtained in the experiments.

Published
2014

43. Experimental study of neutron-rich nuclei near the N = 82 closed shell using the 96Zr+124Sn reaction with GASP and PRISMA-CLARA arrays

Author

Rodríguez, W., Torres, D. A., Cristancho, F., Medina, N. H., Chapman, R., Smith, J. F., Mengoni, Daniele, Truesdale, V., Grocutt, L., Mulholland, K., Kumar, V., Hadinia, B., Labiche, M., Liang, X., O'Donell, D., Ollier, J., Orlandi, R., Spohr, K. M., Wady, P., Wang, Z. M., Gadea, A., C. A., Ur, Lenzi, SILVIA MONICA, Capponi, L., Michelagnoli, Caterina, Bazzacco, D., Beghini, S., Mărginean, R., Mengoni, D., Montagnoli, Giovanna, Recchia, Francesco, Scarlassara, Fernando, Lunardi, Santo, Kröll, T., Napoli, D. R., Corradi, L., Fioretto, E., de Angelis, G., Mărginean, N., Sahin, E., Stefanini, A. M., Valiente Dobon, J. J., Vedova, F. D., Axiotis, M., Martinez, T., Szilner, S., Freeman, S. J., Smith, A. G., Jones, G., Thompson, N., and Pollarolo, G.

Published
2014

44. Measurements of octupole collectivity in Rn and Ra nuclei using Coulomb excitation

Author

Rapisarda, E, Stora, T, Voulot, D, Wenander, F, Bauer, C, Bönig, S, Ilieva, S, Kröll, Th, Scheck, M, Stegmann, R, Thürauf, M, Celikovic, I, Clément, E, de France, G, Jungmann, K, Willmann, L, Wilschut, H, Garrett, P, Svensson, C, Grahn, T, Greenlees, P, Julin, R, Pakarinen, J, Rahkila, P, Blazhev, A, Reiter, P, Warr, N, Kwan, E, Stoyer, M, Wu, C, Huyse, M, Kesteloot, N, Van Duppen, P, Wrzosek-Lipska, K, Butler, P, Gaffney, L, Joss, D, O'Neill, G, Page, R, Papadakis, P, Cederkäll, J, Fahlander, C, Chupp, T, Lorenzon, W, Wimmer, K, Görgen, A, Guttormsen, M, Larsen, A, Siem, S, Cline, D, Hayes, A, Salsac, M, Zielinska, M, Sedlak, M, Venhart, M, Veselský, M, Hadyńska-Klęk, K, Napiorkowski, P, Srebrny, J, Capponi, L, Grocutt, L, Mulholland, K, Smith, J, Andreyev, A, Barton, C, and Jenkins, D

Subjects
Detectors and Experimental Techniques
Published
2012

45. Experimental study of neutron-rich nuclei near the N = 82 closed shell using the 4096Zr+50124Sn reaction with GASP and PRISMA-CLARA arrays

Author

Rodríguez, W., primary, Torres, D. A., additional, Cristancho, F., additional, Medina, N. H., additional, Chapman, R., additional, Smith, J. F., additional, Mengoni, D., additional, Truesdale, V., additional, Grocutt, L., additional, Mulholland, K., additional, Kumar, V., additional, Hadinia, B., additional, Labiche, M., additional, Liang, X., additional, O'Donell, D., additional, Ollier, J., additional, Orlandi, R., additional, Spohr, K. M., additional, Wady, P., additional, Wang, Z. M., additional, Gadea, A., additional, Ur, C. A., additional, Lenzi, S. M., additional, Capponi, L., additional, Michelangnoli, C., additional, Bazzacco, D., additional, Beghini, S., additional, Mărginean, R., additional, Montagnoli, G., additional, Recchia, F., additional, Scarlassara, F., additional, Lunardi, S., additional, Kröll, T., additional, Napoli, D. R., additional, Corradi, L., additional, Fioretto, E., additional, de Angelis, G., additional, Mărginean, N., additional, Sahin, E., additional, Stefanini, A. M., additional, Valiente-Dobon, J. J., additional, Vedova, F. D., additional, Axiotis, M., additional, Martinez, T., additional, Szilner, S., additional, Freeman, S. J., additional, Smith, A. G., additional, Jones, G., additional, Thompson, N., additional, and Pollarolo, G., additional

Published
2014
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46. Experimental study of neutron-rich nuclei near the N = 82 closed shell using the 4096Zr + 50124Sn reaction with GASP and PRISMA-CLARA arrays.

Author

Rodríguez, W., Torres, D. A., Cristancho, F., Medina, N. H., Chapman, R., Smith, J. F., Mengoni, D., Truesdale, V., Grocutt, L., Mulholland, K., Kumar, V., Hadinia, B., Labiche, M., Liang, X., O'Donell, D., Ollier, J., Orlandi, R., Spohr, K. M., Wady, P., and Wang, Z. M.

Subjects
ZIRCONIUM isotopes, TIN isotopes, NEUTRONS, NUCLEAR reactions, YRAST states
Abstract

In this contribution an experimental study of the deep-inelastic reaction 4096Zr+50124 Sn at 530 MeV, using the GASP and PRISMA-CLARA arrays, is presented. The experiments populate a wealth of projectile-like and target-like binary fragments, in a large neutron-rich region around N ≥ 50 and Z ≈ 40. Preliminary results on the study of the yrast and near-yrast states for 95Nb will be shown, along with a comparison of the experimental yields obtained in the experiments. [ABSTRACT FROM AUTHOR]

Published
2014
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47. Lifetime measurements of N ≃ 20 phosphorus isotopes using the AGATA γ-ray tracking spectrometer.

Author

Grocutt, L.

Subjects
*MAGNETIC spectrometer, *ISOTOPES, *BRANCHING ratios, *SPECTROMETERS, *PHOSPHORUS
Abstract

Lifetimes of excited states of the phosphorus isotopes 33, 34, 35, 36 15P have been measured by using the differential recoil-distance method. The isotopes of phosphorus were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were made within the range from about 1 to 100 ps. The number of states for which lifetime measurements were possible was limited by statistics. For 33P, lifetime limits were determined for the first 3/2+ and 5/2+ states at 1431 and 1848 keV, respectively; the results are compared with previous published lifetime values. The lifetime of the first 2+ state of 34 P at 429 keV was determined and compared with earlier measurements. For 35 P, the states for which lifetimes, or lifetime limits, were determined were those at 2386, 3860, 4101, and 4493 keV, with J π values of 3/2+, 5/2+, 7/2-1, and 7/2-2, respectively. There have been no previous published lifetimes for states in this nucleus. A lifetime was measured for the stretched π (1 f 7/2) ⊗ ν (1 f 7/2) J π = (7+) state of 36 P at 5212 keV and a lifetime limit was established for the stretched π (1 d 3/2) ⊗ ν (1 f 7/2) J π = (5-) state at 2030 keV. There are no previously published lifetimes for states of 36 P. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF effective interaction. In addition, measured branching ratios, published mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. In general, there is good agreement between experiment and the shell model; however there is evidence that the shell-model values of the M 1 transition rates for the 3/2+ 1 → 1/2+ (ground state) and 5/2+ 1 → 3/2+ 1 transitions in 33 P underestimate the experimental values by a factor between 5 and 10. In 35 P there are some disagreements between experimental and shell-model values of branching ratios for the first and second excited 7/2- states. In particular, there is a serious disagreement for the decay characteristics of the second 7/2- state at 4493 keV, for which the shell-model counterpart lies at 4754 keV. In this case, the shell-model competing electromagnetic decay branches are dominated by E1 and M1 transitions. [ABSTRACT FROM AUTHOR]

Published
2019
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48. Experimental study of the9541Nb level scheme using the9640Zr +12450Sn reaction with the GASP and PRISMA-CLARA arrays

Author

Rodriguez, W., Torres, D. A., Cristancho, F., Medina, N. H., Chapman, R., Smith, J. F., Mengoni, D., Truesdale, V., Grocutt, L., Mulholland, K., Hadinia, B., Labiche, M., Liang, X., O Donell, D., Ollier, J., Orlandi, R., Spohr, K. M., Wady, P., Wang, Z. M., Gadea, A., Ur, C. A., Lenzi, S. M., Capponi, L., Michelangnoli, C., Bazzacco, D., Beghini, S., Mǎrginean, R., Montagnoli, G., Recchia, F., Scarlassara, F., Lunardi, S., Kröll, T., Daniel R. Napoli, Corradi, L., Fioretto, E., Angelis, G., Mǎrginean, N., Sahin, E., Stefanini, A. M., Valiente-Dobon, J. J., Vedova, F. D., Axiotis, M., Martinez, T., Szilner, S., Freeman, S. J., Smith, A. G., Jones, G., Thompson, N., and Pollarolo, G.

49. Experimental study of the 9541Nb level scheme using the 9640Zr + 12450Sn reaction with the GASP and PRISMA-CLARA arrays

Author

Wilmar Rodriguez, Torres, D. A., Cristancho, F., Medina, N. H., Chapman, R., Smith, J. F., Mengoni, D., Truesdale, V., Grocutt, L., Mulholland, K., Hadinia, B., Labiche, M., Liang, X., O Donell, D., Ollier, J., Orlandi, R., Spohr, K. M., Wady, P., Wang, Z. M., Gadea, A., Ur, C. A., Lenzi, S. M., Capponi, L., Michelangnoli, C., Bazzacco, D., Beghini, S., Mǎrginean, R., Montagnoli, G., Recchia, F., Scarlassara, F., Lunardi, S., Kröll, T., Napoli, D. R., Corradi, L., Fioretto, E., Angelis, G., Mǎrginean, N., Sahin, E., Stefanini, A. M., Valiente-Dobon, J. J., Vedova, F. D., Axiotis, M., Martinez, T., Szilner, S., Freeman, S. J., Smith, A. G., Jones, G., Thompson, N., and Pollarolo, G.

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