Study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>56</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Ni</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="italic">d</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>57</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi>Ni</mml:mi></mml:math>Reaction and the Astrophysical<mml:math xmlns:m

Rehm, K. E.; Borasi, F.; Jiang, C. L.; Ackermann, D.; Ahmad, I.; Brown, B. A.; Brumwell, F.; Davids, C. N.; Decrock, P.; Fischer, S. M.; Görres, J.; Greene, J. P.; Hackmann, G; Harss, B.; Henderson, D.J.; Henning, W.; Janssens, R. V. F.; McMichael, G.E.; Nanal, V.; Nisius, D.; Nolen, J.A.; Pardo, R. C.; Paul, M.; Reiter, P.; Schiffer, J. P.; Seweryniak, D.; Segel, R. E.; Wiescher, M.; Wuosmaa, A. H.

doi:10.1103/physrevlett.80.676

Cited by 79 publications

(41 citation statements)

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“…With the availability of beams of short-lived ions at energies relevant to these studies, i.e. of a few MeV to a few tens of MeV per nucleon, it is now possible to conduct transfer reactions with exotic nuclei in inverse kinematics (for example [4][5][6][7][8]). In particular, the single-neutron stripping reaction (d,p) can be performed using beams of fission fragments impinging on targets of deuterated plastic [6,7].…”

Section: Introductionmentioning

confidence: 99%

Direct reaction measurements with a132Sn radioactive ion beam

et al. 2011

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The (d,p) neutron transfer and (d,d) elastic scattering reactions were measured in inverse kinematics using a radioactive ion beam of 132 Sn at 630 MeV. The elastic scattering data were taken in a region where Rutherford scattering dominated the reaction, and nuclear effects account for less than 8% of the elastic scattering cross section. The magnitude of the nuclear effects, in the angular range studied, was found to be independent of the optical potential used, allowing the transfer data to be normalized in a reliable manner. The neutron-transfer reaction populated a previously unmeasured state at 1363 keV, which is most likely the single-particle 3p 1/2 state expected above the N = 82 shell closure. The data were analyzed using finite-range adiabatic-wave calculations and the results compared with the previous analysis using the distorted-wave Born approximation. Angular distributions for the ground-and first-excited states are consistent with the previous tentative spin and parity assignments. Spectroscopic factors extracted from the differential cross sections are similar to those found for the one-neutron states beyond the benchmark doubly-magic nucleus 208 Pb.

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Section: Introductionmentioning

confidence: 99%

Direct reaction measurements with a132Sn radioactive ion beam

et al. 2011

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“…A much higher value for C 2 S , and therefore the proton partial width, is deemed unlikely as γ decay has been observed from this 5/2 − state in 57 Cu [10]. Figure 2 also shows some previous reaction rate calculations for comparison [7,10,9]. At lower temperatures, the van Wormer theoretical calculation is orders of magnitude lower and reflects the then unknown resonance energies in 57 Cu.…”

mentioning

confidence: 91%

“…A pioneering study of the 56 Ni(d,p) 57 Ni transfer reaction, measuring the differential cross section in inverse kinematics, found these three lowest-lying states were described with relatively pure single-neutron configurations with spectroscopic factors C 2 S ∼ 0.9, with an approximate factor of two uncertainties [9]. This information was then used to estimate the resonance contributions of the two low-lying analog excited states in 57 Cu [9,10] for the 56 Ni(p,γ) 57 Cu reaction rate, assuming isospin symmetry. Subsequently, an attempt was made to measure the single-particle strengths of these states directly in 57 Cu using the 56 Ni( 3 He,d) 57 Cu proton transfer reaction; however, due to the limited resolution of ∼ 700 keV in excitation energy and low statistics, definite conclusions could not be drawn [11].…”

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confidence: 99%

“…The later rate of Zhou et al used known experimental energies but the proton and γ widths were entirely estimated from theory; the large reaction rate difference, particularly for T < 1 GK, is caused by the relatively low proton partial width derived for the 1/2 − resonance in that estimate [10]. The rate of Rehm et al [9] incorporates the results for the spectroscopic factors for the two lowest-lying excited states in 57 Ni. This central rate agrees well at low temperatures, as the same proton width and resonance strength values are obtained for the 1/2 − state.…”

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Single-particle shell strengths near the doubly magic nucleus 56Ni and the 56Ni(p,γ)57Cu reaction rate in explosive astrophysical burning

et al. 2019

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Angle-integrated cross-section measurements of the 56 Ni(d,n) and (d,p) stripping reactions have been performed to determine the single-particle strengths of low-lying excited states in the mirror nuclei pair 57 Cu− 57 Ni situated adjacent to the doubly magic nucleus 56 Ni. The reactions were studied in inverse kinematics utilizing a beam of radioactive 56 Ni ions in conjunction with the GRETINA γ-array. Spectroscopic factors are compared with new shell-model calculations using a full p f model space with the GPFX1A Hamiltonian for the isospin-conserving strong interaction plus Coulomb and charge-dependent Hamiltonians. These results were used to set new constraints on the 56 Ni(p,γ) 57 Cu reaction rate for explosive burning conditions in x-ray bursts, where 56 Ni represents a key waiting point in the astrophysical rp-process.

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“…Since 56 Ni was confirmed as a radioactive doubly magic nucleus on the neutron-deficient side [9], the potentially doubly magic nucleus 132 Sn on the neutron-rich side has been paid much attention both experimentally and theoretically in the past years. However, pinning down whether 132 Sn is doubly magic or not was not so straightforward.…”

mentioning

confidence: 99%

Spin-orbit and orbit-orbit strengths for the radioactive neutron-rich doubly magic nucleusSn132in relativistic mean-field theory

Liang¹,

Zhao²,

Li³

et al. 2011

Phys. Rev. C

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Relativistic mean-field (RMF) theory is applied to investigate the properties of the radioactive neutron-rich doubly magic nucleus 132 Sn and the corresponding isotopes and isotones. The two-neutron and two-proton separation energies are well reproduced by the RMF theory. In particular, the RMF results agree with the experimental single-particle spectrum in 132 Sn as well as the Nilsson spin-orbit parameter C and orbit-orbit parameter D thus extracted, but remarkably differ from the traditional Nilsson parameters. Furthermore, the present results provide a guideline for the isospin dependence of the Nilsson parameters.The concept of magic numbers is one of the most fundamental ingredients for understanding the nature of atomic nuclei. Due to the strong spin-orbit couplings, the magic numbers for stable nuclei are shown as 2, 8, 20, 28, 50, and 82 for both protons and neutrons as well as 126 for neutrons [1,2], which are no longer simply the shell closure of the harmonic oscillators. Thus it is quite sophisticated to predict the next proton and neutron magic numbers [3,4], which are, nevertheless, critical for guiding the superheavy element synthesis. The phenomenon of shell closure is also crucial for determining the waiting points of the rapid neutron-capture process (r process), which is responsible for the production of more than half of the elements heavier than iron.With both proton and neutron magic numbers, the so-called doubly magic nuclei form a very small and exclusive club. These nuclei are rigidly spherical and particularly stable compared to their neighbors. Along the β stability line, only five nuclei are included: 4 He, 16 O, 40 Ca, 48 Ca, and 208 Pb. Furthermore, by simply combining these traditional magic numbers, one will also end up with the neutron-deficient nuclei 48 Ni, 56 Ni, and 100 Sn, neutron-rich nuclei 78 Ni and 132 Sn, as well as the extreme neutron-rich nucleus 70 Ca that is predicted as a giant halo nucleus [5]. It has been shown that the shell structures existing in the single-particle spectra can change in the nuclei far away from the stability line [6]. For example, the N = 28 shell closure disappears when the proton number decreases, and thus the nucleus 44 S is found to have prolate-spherical shape coexistence [7] and 42 Si is well deformed [8]. Therefore, whether the potentially doubly magic nuclei far away from the stability line are indeed doubly magic is a hot and fundamental topic.Since 56 Ni was confirmed as a radioactive doubly magic nucleus on the neutron-deficient side [9], the potentially doubly magic nucleus 132 Sn on the neutron-rich side has been paid much attention both experimentally and theoretically in the past years. However, pinning down whether 132 Sn is doubly magic or not was not so straightforward. By using the Sn(α,t) reactions, it was found that outside the Z = 50 core the energy gap between the proton single-particle states 1h 11/2 and 1g 7/2 increases with neutron excess [10], which suggests a decrease in the nuclear spin-orbit interaction. This was r...

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Study of the56Ni(d,p)57NiReaction and the Astrophysical

Cited by 79 publications

References 14 publications

Direct reaction measurements with a132Sn radioactive ion beam

Direct reaction measurements with a132Sn radioactive ion beam

Single-particle shell strengths near the doubly magic nucleus 56Ni and the 56Ni(p,γ)57Cu reaction rate in explosive astrophysical burning

Spin-orbit and orbit-orbit strengths for the radioactive neutron-rich doubly magic nucleusSn132in relativistic mean-field theory

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