Coulomb breakup of neutron-rich <sup>29,30</sup>Na isotopes near the island of inversion

Rahaman, A.; Pramanik, U. Datta; Aumann, T.; Beceiro-Novo, S.; Boretzky, K.; Caesar, C.; Carlson, B. V.; Catford, W. N.; Chakraborty, Sovan; Chartier, M.; Cortina-Gil, D.; Angelis, G. de; González-Díaz, D.; Emling, H.; Fernandez, P. Diaz; Fraile, L. M.; Ershova, O.; Geißel, H.; Jonson, B.; Johansson, H.; Kalantar‐Nayestanaki, N.; Krücken, R.; Kroll, Thilo; Kurcewicz, J.; Langer, C.; Bleis, T. Le; Leifels, Y.; Münzenberg, G.; Marganiec, J.; Nilsson, T.; Nociforo, C.; Nowacki, F.; Najafi, Amirali; Panin, V.; Paschalis, S.; Plag, R.; Poves, A.; Ray, Indrani; Reifarth, R.; Rigollet, C.; Ricciardi, V.; Rossi, D.; Scheit, H.; Simon, H.; Scheidenberger, C.; Typel, S.; Taylor, J. T.; Togano, Y.; Волков, В. А.; Weick, H.; Wagner, A.; Wamers, F.; Weigand, M.; Winfield, J. S.; Yakorev, D.; Zorić, Marko

doi:10.1088/1361-6471/aa594d

Cited by 3 publications

(15 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the detailed experimental setup and detector calibrations, see [42][43][44]. A direct breakup model [19,34,42,[45][46][47][48][49][50] was used for the analysis of the experimental data of the nonresonant continuum contribution of the Coulomb excitation. The CD cross section was measured using a Pb target.…”

Section: Methodsmentioning

confidence: 99%

“…However, breakup data were also taken for a carbon target to estimate nuclear contributions of the Pb target and from an empty target for 045801-3 information on background reactions which could take place in various detector materials. The nuclear contribution in the Pb target was obtained from the C target data with a scaling factor [42,48,49]. The scaling factor was determined using the soft sphere model [51].…”

Section: Methodsmentioning

confidence: 99%

“…The γ -ray spectra from reactions with high energy projectiles on high-Z targets are strongly affected by the low-energy (up to energies of a few MeV) background. This background originates from atomic interactions of the beam with the lead target [42,48,49]. That atomic background spectrum was obtained by considering noninteracting beam condition.…”

Section: Methodsmentioning

confidence: 99%

“…That atomic background spectrum was obtained by considering noninteracting beam condition. Those spectra for the neutron-rich nuclei were shown as a component in the summed energy spectra of the γ rays [42,48,49]. The summed energy spectrum of γ rays was obtained by summing energies of time-correlated γ rays events after Doppler correction followed by add-back.…”

Section: Methodsmentioning

confidence: 99%

“…This resolution is around 15%. The feeding corrections and efficiency correction were calculated using a GEANT4 simulation (Cascade Bertini model) [42,48,49,52,53]. For validation of simulation, the simulated results have been compared with source data ( 133 Cs, 60 Co) and the results are in agreement with simulation within 10%.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Bhattacharyya¹,

Pramanik²,

Rahaman³

et al. 2021

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

The measurements of neutron capture cross sections of neutron-rich nuclei are challenging but essential for understanding nucleosynthesis and stellar evolution processes in the explosive burning scenario. In the quest of r-process abundances, according to the neutrino-driven-wind model, light neutron-rich unstable nuclei may play a significant role as seed nuclei that influence the abundance pattern. Hence, experimental data for neutron capture cross sections of neutron-rich nuclei are needed. Coulomb dissociation of radioactive ion beams at intermediate energy is a powerful indirect method for inferring capture cross section. As a test case for validation of the indirect method, the neutron capture cross section (n, γ ) for 14 C was inferred from the Coulomb dissociation of 15 C at intermediate energy (600A MeV). A comparison between different theoretical approaches and experimental results for the reaction is discussed. We report for the first time experimental reaction cross sections of 28 Na(n, γ ) 29 Na, 29 Na(n, γ ) 30 Na, 32 Mg(n, γ ) 33 Mg, and 34 Al(n, γ ) 35 Al. The reaction cross sections were inferred indirectly through Coulomb dissociation of 29,30 Na, 33 Mg, and 35 Al at incident projectile energies around 400-430 A MeV using the FRS-LAND setup at GSI, Darmstadt. The neutron capture cross sections were obtained from the photoabsorption cross sections with the aid of the detailed balance theorem. The reaction rates for the neutron-rich Na, Mg, Al nuclei at typical r-process temperatures were obtained from the measured (n, γ ) capture cross sections. The measured neutron capture reaction rates of the neutron-rich nuclei, 28 Na, 29 Na, and 34 Al are significantly lower than those predicted by the Hauser-Feshbach decay model. A similar trend was observed earlier for 17 C and 19 N but in the case of 14 C(n, γ ) 15 C the trend is opposite. The situation is more complicated when the ground state has a multi-particle-hole configuration. For 32 Mg, the measured cross section is about 40-90 % higher than the Hauser-Feshbach prediction.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Bhattacharyya¹,

Pramanik²,

Rahaman³

et al. 2021

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

show abstract

Systematic study on the role of various higher-order processes in the breakup of weakly-bound projectiles

Singh

Matsumoto

Ogata

2021

Progress of Theoretical and Experimental Physics

View full text Add to dashboard Cite

The virtual photon theory (VPT), which is based on first-order Coulomb dissociation restricted to the electric dipole (E1), has been successfully used to explain the breakup data for several cases. Our aim is to study the role of various higher-order processes that are ignored in the VPT, such as the nuclear breakup, interference between nuclear and Coulomb amplitudes, and multistep breakup processes mainly due to strong continuum-continuum couplings in the breakup of two-body projectiles on a heavy target at both intermediate and higher incident energies. For the purpose of numerical calculations, we employed eikonal version of three-body continuum-discretized coupled-channels (CDCC) reaction model. Our results for the breakup of 11Be and 17F on 208Pb target at 100, 250, and 520 MeV/A, show the importance of nuclear breakup contribution, and its significant role in the multistep processes. The multistep effect on Coulomb breakup for core-neutron projectile was found to be negligible, whereas it was important for core-proton projectile. Coulomb-nuclear interference (CNI) effect was also found to be non-negligible. Qantitatively, the multistep effects due to the nuclear breakup was found to depend on the incident energy through the energy dependence of the core-target and nucleon-target nuclear potentials. The nuclear breakup component, the CNI effect, and the multistep breakup processes are all found to be non-negligible; hence, the assumptions adopted in the VPT for the accurate description of breakup cross sections are not valid.

show abstract

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Chakraborty¹,

Pramanik²,

Aumann³

et al. 2017

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

The ground-state configuration of 35 Al has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of ∼403 MeV/nucleon. The measured inclusive differential CD cross section for 35 Al, integrated up to 5.0 MeV relative energy between the 34 Al core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34 Al is 29(7) mb. The differential CD cross section of 35 Al → 34 Al + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of 35 Al could be, tentatively, 1/2 + or 3/2 + or 5/2 + . The valence neutrons, in the ground state of 35 Al, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the 34 Al core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2 + is the ground-state spin-parity of 35 Al as suggested in the literature, then the major ground-state configuration of 35 Al is a combination of 34 Al(g.s.; 4 − ) ⊗ ν p 3/2 and 34 Al(isomer; 1 + ) ⊗ ν d 3/2 states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

show abstract

Coulomb breakup of neutron-rich ^29,30Na isotopes near the island of inversion

Abstract: Home Search Collections Journals About Contact us My IOPscience Coulomb breakup of neutron-rich 29,30 Na isotopes near the island of inversion This content has been downloaded from IOPscience. Please scroll down to see the full text.

Cited by 3 publications

References 49 publications

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Systematic study on the role of various higher-order processes in the breakup of weakly-bound projectiles

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Contact Info

Product

Resources

About

Coulomb breakup of neutron-rich 29,30Na isotopes near the island of inversion

Abstract: Home Search Collections Journals About Contact us My IOPscience Coulomb breakup of neutron-rich 29,30 Na isotopes near the island of inversion This content has been downloaded from IOPscience. Please scroll down to see the full text.

Cited by 3 publications

References 49 publications

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Systematic study on the role of various higher-order processes in the breakup of weakly-bound projectiles

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Contact Info

Product

Resources

About

Coulomb breakup of neutron-rich ^29,30Na isotopes near the island of inversion