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Author |
Hafner, G. et al; Algora, A. |
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Title |
First lifetime investigations of N > 82 iodine isotopes: The quest for collectivity |
Type |
Journal Article |
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Year |
2021 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
104 |
Issue |
1 |
Pages |
014316 - 18pp |
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Keywords |
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Abstract |
We report on spectroscopic information and lifetime measurements in the neutron-rich I-135,I-137,I-139 isotopes. This is the first lifetime data on iodine isotopes beyond N = 82. Excited states were populated in fast neutron-induced fission of U-238 at the ALTO facility of IJCLab with the LICORNE neutron source and detected using the hybrid nu-ball spectrometer. The level schemes of the I-135,I-137,I-139 isotopes are revised in terms of excited states with up to maximum spin-parity of (33/2(+)), populated for the first time in fast neutron-induced fission. We provide first results on the lifetimes of the (9/2(1)(+)) and (13/2(1)(+)) states in I-137 and I-139, and the (17/2(1)(+)) state in 137I. In addition, we give upper lifetime limits for the (11/2(1)(+)) states in I135-139, the (15/2(1)(+)) state in I-137, the (17/2(1)(+)) state in I-139, and reexamine the (29/2(1)(+)) state in I-137. The isomeric data in I-13(5) are reinvestigated, such as the previously known (15/2(1)(+)) and (23/21) isomers with T-1/2 of 1.64(14) and 4.6(7) ns, respectively, as obtained in this work. The new spectroscopic information is compared to that from spontaneous or thermal-neutron induced fission and discussed in the context of large scale shell-model (LSSM) calculations for the region beyond Sn-132, indicating the behavior of collectivity for the three valence-proton iodine chain with N = 82, 84, 86. |
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Address |
[Haefner, G.; Lozeva, R.; Lebois, M.; Jovancevic, N.; Thisse, D.; Wilson, J. N.; Babo, M.; Chakma, R.; Delafosse, C.; Hauschild, K.; Ibrahim, F.; Nemer, J.; Popovitch, Y.; Qi, L.; Ralet, D.; Tocabens, G.; Verney, D.] Univ Paris Saclay, IJCLab, CNRS IN2P3, F-91405 Orsay, France, Email: radomira.lozeva@ijclab.in2p3.fr |
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Publisher |
Amer Physical Soc |
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English |
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2469-9985 |
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Notes |
WOS:000674546900001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4913 |
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Permanent link to this record |
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Author |
Gosta G. et al.; Gadea, A. |
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Title |
Probing isospin mixing with the giant dipole resonance in the Zn-60 compound nucleus |
Type |
Journal Article |
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Year |
2021 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
103 |
Issue |
4 |
Pages |
L041302 - 6pp |
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Keywords |
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Abstract |
An experimental study of the isospin mixing in the mass region A = 60 was made by measuring the gamma decay from the giant dipole resonance in the compound nuclei Zn-60 and Zn-62. These compound nuclei were populated at two different excitation energies, E* = 47 MeV and E* = 58 MeV using the fusion evaporation reactions S-32 + Si-28 at the bombarding energy of 86 and 110 MeV and S-32 + Si-30 at 75 and 98 MeV. In the experiment, performed at the Laboratori Nazionali di Legnaro of the Istituto Nazionale di Fisica Nucleare (INFN), the gamma rays were measured with the GALILEO detection system in which large-volume LaBr3(Ce) detectors were added to the HPGe detectors. The Coulomb spreading width was obtained from the comparison of the two reactions and then the isospin mixing parameter at zero temperature and the isospin-symmetry-breaking correction for beta decay were deduced. The present results were compared with data of the same type in other mass regions and with data from mass and beta-decay measurements and with theory. The present data allow us to deduce for the first time a consistent picture for mass dependence of isospin mixing and for the corresponding correction for the beta decay, supporting a reliable extension to the very interesting region of Sn-100. |
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Address |
[Gosta, G.; Mentana, A.; Camera, F.; Bracco, A.; Capra, S.; Crespi, F. C. L.; Leoni, S.; Riboldi, S.; Porzio, C.; Ziliani, S.] Univ Milan, Dipartimento Fis, Milan, Italy, Email: Franco.Camera@mi.infn.it; |
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Amer Physical Soc |
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English |
Summary Language |
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ISSN |
2469-9985 |
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Notes |
WOS:000647600600009 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4826 |
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Permanent link to this record |
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Author |
Brunet, M. et al; Nacher, E. |
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Title |
Competition between allowed and first-forbidden beta decays of At-208 and expansion of the Po-208 level scheme |
Type |
Journal Article |
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Year |
2021 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
103 |
Issue |
5 |
Pages |
054327 - 13pp |
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Abstract |
The structure of Po-208 populated through the EC/beta(+) decay of At-208 is investigated using gamma-ray spectroscopy at the ISOLDE Decay Station. The presented level scheme contains 27 new excited states and 43 new transitions, as well as a further 50 previously observed. rays which have been (re)assigned a position. The level scheme is compared to shell model calculations. Through this analysis approximately half of the beta-decay strength of At-208 is found to proceed via allowed decay and half via first-forbidden decay. The first-forbidden transitions predominantly populate core excited states at high excitation energies, which is qualitatively understood using shell model considerations. This mass region provides an excellent testing ground for the competition between allowed and first-forbidden beta-decay calculations, important for the detailed understanding of the nucleosynthesis of heavy elements. |
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Address |
[Brunet, M.; Podolyak, Zs; Berry, T. A.; Carroll, R. J.; Regan, P. H.; Rudigier, M.; Shand, C. M.; Shearman, R.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England, Email: m.h.brunet@surrey.ac.uk |
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Publisher |
Amer Physical Soc |
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English |
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ISSN |
2469-9985 |
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Notes |
WOS:000655863700002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4839 |
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Permanent link to this record |
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Author |
n_TOF Collaboration (Dietz, M. et al); Domingo-Pardo, C.; Tain, J.L. |
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Title |
Measurement of the Ge-72(n, y) cross section over a wide neutron energy range at the CERN n_TOF facility |
Type |
Journal Article |
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Year |
2021 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
103 |
Issue |
4 |
Pages |
045809 - 8pp |
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Keywords |
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Abstract |
The Ge-72(n, gamma) cross section was measured for neutron energies up to 300 keV at the neutron time-of-flight facility n_TOF (CERN), Geneva, for the first time covering energies relevant to heavy-element synthesis in stars. The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched (GeO2)-Ge-72 sample. The prompt capture gamma rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43 keV, and averaged cross sections from 43 to 300 keV. Maxwellian-averaged cross section values were calculated from kT = 5 to 100 keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars. |
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Address |
[Dietz, M.; Lederer-Woods, C.; Tattersall, A.; Battino, U.; Kahl, D.; Lonsdale, S. J.; Woods, P. J.] Univ Edinburgh, Sch Phys & Astron, Edinburgh, Midlothian, Scotland, Email: mirco.dietz@ptb.de |
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Amer Physical Soc |
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English |
Summary Language |
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Series Editor |
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ISSN |
2469-9985 |
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Conference |
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Notes |
WOS:000647603800002 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4811 |
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Permanent link to this record |
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Author |
Gombas, J.; DeYoung, P.A.; Spyrou, A.; Dombos, A.C.; Algora, A.; Baumann, T.; Crider, B.; Engel, J.; Ginter, T.; Kwan, E.; Liddick, S.N.; Lyons, S.; Naqvi, F.; Ney, E.M.; Pereira, J.; Prokop, C.; Ong, W.; Quinn, S.; Scriven, D.P.; Simon, A.; Sumithrarachchi, C. |
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Title |
beta-decay feeding intensity distributions for Nb-103,Nb-104m |
Type |
Journal Article |
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Year |
2021 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
103 |
Issue |
3 |
Pages |
035803 - 8pp |
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Keywords |
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Abstract |
The beta decays of Nb-103,Nb-104m were studied with the Summing NaI(Tl) (SuN) detector at the National Superconducting Cyclotron Laboratory. The beta-decay feeding intensity distribution I-beta(E) for each isotope was extracted by measuring gamma rays in coincidence with an emitted electron. The I-beta(E) was extracted via the total absorption spectroscopy technique. The I-beta(E) for each nucleus was compared to predictions made by the quasiparticle random-phase approximation (QRPA) model which is commonly used to calculate beta-decay properties for astrophysical applications. The main goal was to provide experimental data for neutron-rich nuclei, relevant to the astrophysical r process. In addition, the extracted beta-decay feeding intensity distributions can lead to a better understanding of nuclear structure in a region of rapid structure changes around A = 100. Finally, experimental data for Nb-104m are also of interest to antineutrino studies of nuclear reactors. |
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Address |
[Gombas, J.; DeYoung, P. A.] Hope Coll, Dept Phys, Holland, MI 49422 USA, Email: gombasja@msu.edu; |
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Corporate Author |
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Thesis |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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Language |
English |
Summary Language |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
2469-9985 |
ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
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Notes |
WOS:000627565600005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
4765 |
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Permanent link to this record |