Article
Astronomy & Astrophysics
H. Watanabe, C. X. Yuan, G. Lorusso, S. Nishimura, Z. Y. Xu, T. Sumikama, P-A Soderstrom, P. Doornenbal, F. Browne, G. Gey, H. S. Jung, J. Taprogge, Zs Vajta, H. K. Wang, J. Wu, A. Yagi, H. Baba, G. Benzoni, K. Y. Chae, F. C. L. Crespi, N. Fukuda, R. Gernhauser, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y. K. Kim, I Kojouharov, F. G. Kondev, T. Kubo, N. Kurz, Y. K. Kwon, G. J. Lane, Z. Li, C-B Moon, A. Montaner-Piza, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, D. Nishimura, A. Odahara, R. Orlandi, Z. Patel, Zs Podolyak, H. Sakurai, H. Schaffner, G. S. Simpson, K. Steiger, H. Suzuki, H. Takeda, A. Wendt, K. Yoshinaga
Summary: This study investigates the impact of nuclear shell evolution on Gamow-Teller transitions, focusing on the experimental data of a long-lived isomer in Ag-127, which decays through internal transitions competing with high-spin states in Cd-127. The strong GT transition from the Ag-127 isomer is discussed in terms of configuration-dependent optimization of effective single-particle energies.
Article
Physics, Multidisciplinary
Asim Ullah, Jameel-Un Nabi
Summary: The study calculated the ec and bd rates for nuclei with A=65-80, showing that the ec rates are similar to previous studies, while the bd rates are generally smaller. The calculation may contribute to a more realistic simulation of late phases of stellar evolution and modeling of x-ray bursts.
Article
Physics, Nuclear
Eunja Ha, Seonghyun Kim, Myung-Ki Cheoun, H. Sagawa
Summary: In this study, the roles of the tensor force on the pairing correlations in the ground-state structure of certain nuclei were investigated using a deformed BCS model and the Brueckner G matrix derived from the charge-dependent Bonn potential. The focus was on the neutron-proton pairing and the spin-triplet even tensor force, with detailed analyses on the attractive and repulsive channels. The tensor force was found to be crucial in interpreting experimental data of a two-nucleon knockout reaction from C-12.
Article
Astronomy & Astrophysics
J. Kostensalo, J. Suhonen, K. Zuber
Summary: Large-scale shell-model calculations were conducted to determine the half-lives and branching ratios of the 2 nu beta beta decay of Ge-76 to different states in Se-76. The study involved calculating the wave functions of intermediate 1(+) states in As-76 and computing the nuclear matrix elements and branching ratios. The results provided insights into the behavior of the decay process and the value of the axial-vector coupling gA.
Review
Physics, Multidisciplinary
K. Langanke, G. Martinez-Pinedo, R. G. T. Zegers
Summary: Electron capture on nuclei is crucial in the dynamics of astrophysical objects, with capture rates derived from perturbation theory. Recent progress in experimental techniques and nuclear models has greatly improved our understanding of stellar electron capture rates and their impact on various astrophysical phenomena.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Physics, Nuclear
L. Guo, W. L. Lv, Y. F. Niu, D. L. Fang, B. S. Gao, K. A. Li, X. D. Tang
Summary: We investigated the GT and SD transitions in the 0+ decay direction of neutron-rich N = 50 nucleus 80Zn and N = 82 nucleus 126Ru at different temperatures using finite-temperature proton-neutron relativistic random-phase approximation. The GT+ transitions in 80Zn and 126Ru are almost completely Pauli blocked at zero temperature due to the occupation of an extra shell by neutrons. Even with increasing temperature, the thermal excitation cannot open up strong GT+ transitions. The SD+ transitions in 80Zn are mildly affected by temperature, while in 126Ru, the transition energies decrease by about 2 MeV at T = 1 MeV due to the collapse of the pairing gap.
Article
Physics, Nuclear
I. J. Arnquist, F. T. Avignone, A. S. Barabash, C. J. Barton, F. E. Bertrand, E. Blalock, B. Bos, M. Busch, M. Buuck, T. S. Caldwell, Y-D Chan, C. D. Christofferson, P-H Chu, M. L. Clark, C. Cuesta, J. A. Detwiler, A. Drobizhev, T. R. Edwards, D. W. Edwins, Yu Efremenko, H. Ejiri, S. R. Elliott, T. Gilliss, G. K. Giovanetti, M. P. Green, J. Gruszko, I. S. Guinn, V. E. Guiseppe, C. R. Haufe, R. Henning, D. Hervas Aguilar, E. W. Hoppe, A. Hostiuc, M. F. Kidd, I Kim, R. T. Kouzes, A. M. Lopez, J. M. Lopez-Castano, E. L. Martin, R. D. Martin, R. Massarczyk, S. J. Meijer, S. Mertens, J. Myslik, T. K. Oli, G. Othman, L. S. Paudel, W. Pettus, A. W. P. Poon, D. C. Radford, A. L. Reine, K. Rielage, N. W. Ruof, B. Sayki, M. J. Stortini, D. Tedeschi, R. L. Varner, S. Vasilyev, J. F. Wilkerson, C. Wiseman, W. Xu, C-H Yu, B. X. Zhu
Summary: The MAJORANA DEMONSTRATOR is an experiment aiming to search for neutrinoless double-beta decay, utilizing a modular array of high-purity germanium detectors. The experiment has set world-leading limits for each decay of Ge-76 to excited states in Se-76, achieving a lower half-life limit of 7.5 x 10(23) years at 90% confidence level for a specific transition.
Article
Physics, Multidisciplinary
Jameel-Un Nabi, Muhammad Riaz, Tuncay Bayram, Muhammad Azaz
Summary: This study investigates the effects of nuclear deformation on Gamow-Teller strength distributions in neutron-deficient Hg isotopes. The calculated results validate previous findings and highlight noticeable differences. The study also analyzes the impact of deformation on the calculated half-life of the selected Hg isotopes, showing disagreement with previous observations.
BRAZILIAN JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Jameel-Un Nabi, Tuncay Bayram, Muhammad Riaz, Asim Ullah, Anes Hayder, Sevki Senturk, Mahmut Boyukata
Summary: This study examines the impact of nuclear deformation on the GT strength distributions of neutron-deficient nuclei. Calculations were done using the Relativistic Mean Field model to determine the ground state properties and shape parameters. The deformed proton-neutron quasi-random phase approximations model was then used to calculate the GT strength distributions, half-lives, and branching ratios. The findings show significant variation in half-lives and GT strength distributions with changes in shape parameters.
Article
Physics, Multidisciplinary
Jameel-Un Nabi, Necla Cakmak, Asim Ullah, Asad Ullah Khan
Summary: This paper investigates the beta-decay properties of nuclei with neutron number N = 126 using two different models to calculate decay rates and half-lives, considering Gamow-Teller and first-forbidden transitions. The inclusion of first-forbidden contributions led to better agreement with measured half-lives, suggesting a significant decrement in calculated half-lives of isotones. The possible implications of waiting point nuclei on r-process nucleosynthesis are briefly discussed.
Article
Physics, Particles & Fields
M. Agostini, G. Araujo, A. M. Bakalyarov, M. Balata, I Barabanov, L. Baudis, C. Bauer, E. Bellotti, S. Belogurov, A. Bettini, L. Bezrukov, V Biancacci, E. Bossio, V Bothe, V Brudanin, R. Brugnera, A. Caldwell, C. Cattadori, A. Chernogorov, T. Comellato, V D'Andrea, E. Demidova, N. Di Marco, E. Doroshkevich, F. Fischer, M. Fomina, A. Gangapshev, A. Garfagnini, C. Gooch, P. Grabmayr, V Gurentsov, K. Gusev, J. Hakenmueller, S. Hemmer, W. Hofmann, J. Huang, M. Hult, L. Inzhechik, J. Janicsko Csathy, J. Jochum, M. Junker, V Kazalov, Y. Kermaidic, H. Khushbakht, T. Kihm, I. Kirpichnikov, A. Klimenko, R. Kneissl, K. T. Knoepfle, O. Kochetov, V. N. Kornoukhov, P. Krause, V. V. Kuzminov, M. Laubenstein, M. Lindner, I Lippi, A. Lubashevskiy, B. Lubsandorzhiev, G. Lutter, C. Macolino, B. Majorovits, W. Maneschg, L. Manzanillas, M. Miloradovic, R. Mingazheva, M. Misiaszek, P. Moseev, Y. Mueller, I Nemchenok, L. Pandola, K. Pelczar, L. Pertoldi, P. Piseri, A. Pullia, C. Ransom, L. Rauscher, S. Riboldi, N. Rumyantseva, C. Sada, F. Salamida, S. Schoenert, J. Schreiner, M. Schuett, A-K Schuetz, O. Schulz, M. Schwarz, B. Schwingenheuer, O. Selivanenko, E. Shevchik, M. Shirchenko, L. Shtembari, H. Simgen, A. Smolnikov, D. Stukov, A. A. Vasenko, A. Veresnikova, C. Vignoli, K. von Sturm, T. Wester, C. Wiesinger, M. Wojcik, E. Yanovich, B. Zatschler, I Zhitnikov, S. Zhukov, D. Zinatulina, A. Zschocke, A. J. Zsigmond, K. Zuber, G. Zuzel
Summary: The study reports on the characterization and testing of five Ge-76 IC detectors, confirming their performance and feasibility. These IC detectors combine the large mass of traditional Ge detectors with the superior resolution and pulse shape discrimination power of point contact detectors. After 18 months of operation, it was found that IC detectors show satisfactory performance in the Gerda experiment.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
J. Y. Fang, J. Chen, Z. M. Niu
Summary: Nuclear n-decay half-lives are successfully predicted using an improved gross theory, which incorporates the spin-orbit splitting from relativistic Hartree-Bogoliubov theory. The calculated results exhibit excellent agreement with experimental data for Zr, Sn, and Pb isotopes. The influences of the Q value and the integrated Fermi function on the calculations of n-decay half-lives are carefully studied. Based on the latest Weizsacker-Skyrme model, the half-lives of Ca to Pb isotopes are systematically calculated. The results suggest that the Weizsacker-Skyrme model provides accurate predictions and can be utilized for consistent half-life inputs in r-process studies.
Article
Physics, Multidisciplinary
Jameel-Un Nabi, Asim Ullah, Abdul Kabir, Abdul Muneem, Mahmut Boeyuekata
Summary: We investigated the energy distribution of the GT strength of the decay of 186Hg into 186Au and found that it is dominated by prolate components. Using the total absorption gamma spectroscopy technique and the pn-QRPA model, we analyzed the effect of nuclear deformation and concluded that the ground state of 186Hg prefers a prolate shape and supports shape coexistence.
CANADIAN JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sadiye Cakmak
Summary: Studies of exotic nuclei, particularly in germanium isotopes, play a fundamental role in the dynamics of supernovae. The calculation of Gamow-Teller transitions using QRPA methods and the comparison with theoretical and experimental data provide valuable insights into the properties of GT in massive stars. This study contributes to a better understanding of the presupernova evolution of massive stars.
INDIAN JOURNAL OF PHYSICS
(2021)
Article
Physics, Nuclear
Steven Gardiner
Summary: This study develops a model for nuclear de-excitations following the reaction of Ar-40(nu(e), e(-))K-40+ and applies it to calculate exclusive cross sections, revealing the significant impact of nuclear de-excitations on energy resolution in liquid argon for supernova nu(e) detection, especially at energies of a few tens of MeV. The MARLEY nuclear de-excitation model, with suitable inclusive cross section calculations, can be readily applied to other scattering processes.
Article
Physics, Nuclear
P. Sarriguren
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2020)
Article
Physics, Nuclear
M. K. Gaidarov, I. Moumene, A. N. Antonov, D. N. Kadrev, P. Sarriguren, E. Moya de Guerra
Article
Astronomy & Astrophysics
P. Sarriguren
Summary: This study investigates weak decays in superheavy nuclei using a microscopic formalism, revealing that alpha decay is always dominant in this mass region. The competition between alpha and ss(+)/EC decay modes is also explored in different alpha-decay chains.
Article
Astronomy & Astrophysics
A. Algora, E. Ganioglu, P. Sarriguren, V Guadilla, L. M. Fraile, E. Nacher, B. Rubio, J. L. Tain, J. Agramunt, W. Gelletly, J. A. Briz, R. B. Cakirli, M. Fallot, D. Jordan, Z. Halasz, I Kuti, A. Montaner, A. Onillon, S. E. A. Orrigo, A. Perez Cerdan, S. Rice, V. Vedia, E. Valencia
Summary: The Gamow-Teller strength distribution of the decay of Hg-186 into Au-186 has been determined for the first time, showing predominantly prolate components in both parent and daughter nuclei. The study also developed a new approach for analyzing X-ray gated total absorption spectra.
Article
Astronomy & Astrophysics
A. Vitez-Sveiczer, A. Algora, A. Morales, B. Rubio, G. G. Kiss, P. Sarriguren, P. Van Isacker, G. de Angelis, F. Recchia, S. Nishimura, J. Agramunt, V Guadilla, A. Montaner-Piza, S. E. A. Orrigo, A. Horvath, D. Napoli, S. Lenzi, A. Boso, V. H. Phong, J. Wu, P-A Soderstrom, T. Sumikama, H. Suzuki, H. Takeda, D. S. Ahn, H. Baba, P. Doornebal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono, H. Sakurai, Y. Shimizu, C. Sidong, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grevy, T. Kurtukian Nieto, C. Magron, W. Gelletly, Zs Dombradi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diel, D. Lubos, C. Borcea, E. Ganioglu, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I Kojouharov, N. Kurz, H. Shaffner, A. Petrovici
Summary: The beta-decay of the even-even nucleus Kr-70 with Z=N+2 was investigated, and fifteen gamma-rays associated with the beta-decay were identified for the first time. The half-life of Kr-70 and the beta-delayed proton emission probability were determined with increased precision. The study observed an increase in the beta-strength to the yrast 1(+) state, indicating potential increased np correlations in the T=0 channel.
Article
Astronomy & Astrophysics
P. Sarriguren
Summary: Elastic electron scattering from oriented odd -A axially deformed nuclei is studied in the plane-wave Born approximation. The interference form factors between monopole and quadrupole Coulomb terms that characterize the nuclear response with aligned nuclear targets are shown to increase or decrease the unpolarized cross-section, depending on the sign of the quadrupole deformation. This feature provides valuable information on the nuclear deformation that can be used as a signature of the oblate or prolate character of the nuclear shape. Some selected cases of nuclei with different spins are presented that exemplify the scope of the method.
Article
Physics, Nuclear
J. T. Zhang, P. Ma, Y. Huang, X. L. Tu, P. Sarriguren, Z. P. Li, Y. Kuang, W. Horiuchi, T. Inakura, L. Xayavong, Y. Sun, K. Kaneko, X. Q. Liu, K. Yue, C. J. Shao, Q. Zeng, B. Mei, P. Egelhof, Yu. A. Litvinov, M. Wang, Y. H. Zhang, X. H. Zhou, Z. Y. Sun
Summary: Small-angle differential cross sections of proton elastic scattering off 78Kr with a collision energy of 152.7 MeV/u were measured using the Glauber model at HIRFL-CSR. A model-dependent root-mean-square matter radius of 4.16(12) fm for the 78Kr nucleus was deduced, slightly larger than the proton radius of 4.13 fm for 78Kr. However, considering the relatively large radius error of 78Kr, the difference is not statistically significant and further experiments are necessary.
Article
Physics, Nuclear
Z. Y. Xu, M. Madurga, R. Grzywacz, T. T. King, A. Algora, A. N. Andreyev, J. Benito, T. Berry, M. J. G. Borge, C. Costache, H. De Witte, A. Fijalkowska, L. M. Fraile, H. O. U. Fynbo, A. Gottardo, C. Halverson, L. J. Harkness-Brennan, J. Heideman, M. Huyse, A. Illana, L. Janiak, D. S. Judson, A. Korgul, T. Kurtukian-Nieto, I. Lazarus, R. Lica, R. Lozeva, N. Marginean, R. Marginean, C. Mazzocchi, C. Mihai, R. E. Mihai, A. I. Morales, R. D. Page, J. Pakarinen, M. Piersa-Silkowska, Zs. Podolyak, P. Sarriguren, M. Singh, Ch. Sotty, M. Stepaniuk, O. Tengblad, A. Turturica, P. Van Duppen, V. Vedia, S. Vinals, N. Warr, R. Yokoyama, C. X. Yuan
Summary: The decay properties of 133In were studied in detail, and the decay strengths above the neutron separation energy were quantified for the first time. The different nuclear states were distinguished, and spins and parities were assigned to neutron-unbound states based on the measurements.
Article
Physics, Nuclear
O. Moreno, P. Sarriguren, A. Algora, L. M. Fraile, S. E. A. Orrigo
Summary: This study describes the ground and isomeric states of the neutron-deficient odd-A isotopes 183Hg, 185Hg, and 187Hg using a microscopic calculation based on a self-consistent, axially deformed Hartree-Fock mean field with the Skyrme functional and pairing within BCS approximation. The results on mean-square charge radii and magnetic dipole moments for different odd-neutron states and equilibrium shapes are analyzed in terms of their sensitivity to nuclear deformation, spin, and parity. Additionally, spin-isospin correlations are introduced to obtain the distributions of Gamow-Teller strength and the beta+/EC half-lives of these isotopes.
Article
Physics, Nuclear
J. A. Briz, M. J. G. Borge, B. Rubio, J. Agramunt, A. Algora, A. Y. Deo, M. E. Estevez Aguado, G. Farrelly, L. M. Fraile, W. Gelletly, A. Maira, E. Nacher, A. Perea, Zs Podolyak, A. Poves, P. Sarriguren, O. Tengblad
Summary: The spins and parities of low-lying states in 72Br, which are generated from the beta decay of 72Kr, were investigated using conversion electron spectroscopy. The results provide insights into the level structure and shape characteristics of 72Br, and E0 transitions in neighboring isobaric nuclei were also studied.
Article
Physics, Nuclear
P. Sarriguren
Summary: The competition between alpha- and beta(+) /EC-decay modes in superheavy nuclei synthesis is systematically studied. The alpha decay is found to be the dominant decay mode in most cases, but there are interesting instances where the half-lives of both modes are comparable, indicating the possibility of new pathways to more neutron-rich nuclei in this region.
Article
Physics, Nuclear
M. K. Gaidarov, E. Moya de Guerra, A. N. Antonov, I. C. Danchev, P. Sarriguren, D. N. Kadrev
Summary: A new alternative approach is proposed to calculate the ratio of the surface to volume components of the nuclear symmetry energy within the coherent density fluctuation model (CDFM). This new expression, scheme II, is found to be more direct and physically motivated than the previous expression (scheme I). By comparing results with empirical data, scheme II leads to more realistic values and exhibits conceptual and operational advantages over scheme I.
Article
Physics, Nuclear
J. T. Zhang, X. L. Tu, P. Sarriguren, K. Yue, Q. Zeng, Z. Y. Sun, M. Wang, Y. H. Zhang, X. H. Zhou, Yu A. Litvinov
Summary: Experimental neutron skin thicknesses of stable even-even Ca, Ni, Sn, Pb, and Cd isotopes are evaluated, showing separate trends based on relative neutron excess. This phenomenon is quantitatively reproduced using the deformed Skyrme-Hartree-Fock+Bardeen-Cooper-Schrieffer model with the SLy4 force.
Article
Physics, Nuclear
A. C. Dombos, A. Spyrou, F. Naqvi, S. J. Quinn, S. N. Liddick, A. Algora, T. Baumann, J. Brett, B. P. Crider, P. A. DeYoung, T. Ginter, J. Gombas, S. Lyons, T. Marketin, P. Moller, W-J Ong, A. Palmisano, J. Pereira, C. J. Prokop, P. Sarriguren, D. P. Scriven, A. Simon, M. K. Smith, S. Valenta
Summary: The research investigated beta decay of Zr-101, Zr-102, and Tc-109 using total absorption spectroscopy, finding a mixture of different shape configurations may be necessary for better reproduction of decay distributions.
Article
Physics, Nuclear
B. Hernandez, P. Sarriguren, O. Moreno, E. Moya de Guerra, D. N. Kadrev, A. N. Antonov
Summary: The study focuses on the sensitivity of magnetic form factors to structural effects related to the evolution and shape transitions in isotopic and isotonic chains, identifying specific cases showing signatures of shape transitions. The results indicate a renewed interest in this field with the upcoming generation of electron scattering experiments.
