Neutron Skin of Na Isotopes Studied via Their Interaction Cross Sections

Suzuki, Toshio; Geißel, H.; Bochkarev, O.V.; Chulkov, L. V.; Golovkov, M. S.; Hirata, D.; Irnich, H.; Janas, Z.; Keller, H.; Kobayashi, Tooru; Kraus, G.; Münzenberg, G.; Neumaier, S.; Nickel, F.; Ozawa, A.; Piechaczeck, A.; Roeckl, E.; Schwab, W.; Sümmerer, K.; Yoshida, Kôichi; Tanihata, I.

doi:10.1103/physrevlett.75.3241

Cited by 213 publications

(100 citation statements)

References 19 publications

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“…Advances in the radioactive ion beam facilities have made it possible to study properties of short-lived unstable nuclei. From such facilities, the exotic structure of neutron-rich unstable nuclei was reported, which has never been observed in stable nuclei, e.g., halo [2] and developed skin [3] structure.…”

Section: Introductionmentioning

confidence: 99%

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

2018

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The nuclear surface provides useful information on nuclear radius, nuclear structure, as well as properties of nuclear matter. We discuss the relationship between the nuclear surface diffuseness and elastic scattering differential cross section at the first diffraction peak of high-energy nucleon-nucleus scattering as an efficient tool in order to extract the nuclear surface information from limited experimental data involving short-lived unstable nuclei. The high-energy reaction is described by a reliable microscopic reaction theory, the Glauber model. Extending the idea of the black sphere model, we find one-to-one correspondence between the nuclear bulk structure information and proton-nucleus elastic scattering diffraction peak. This implies that we can extract both the nuclear radius and diffuseness simultaneously, using the position of the first diffraction peak and its magnitude of the elastic scattering differential cross section. We confirm the reliability of this approach by using realistic density distributions obtained by a mean-field model.

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Section: Introductionmentioning

confidence: 99%

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

2018

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“…We now have access to experimental measurements of the masses, radii and deformations of unstable nuclei in a wider region of the nuclear chart than ever before. Studies of exotic nuclei have revealed new features, such as neutron halos [1] and neutron skins [2,3] and bring new perspectives to nuclear physics [4]. Planned facilities around the world plan to study unstable nuclei up to the r-process region or even beyond.…”

Section: Introductionmentioning

confidence: 99%

Dirac-Hartree-Bogoliubov approximation for finite nuclei

Carlson

Hirata

2000

Phys. Rev. C

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We develop a complete Dirac-Hartree-Fock-Bogoliubov approximation to the ground state wave function and energy of finite nuclei. We apply it to spinzero proton-proton and neutron-neutron pairing within the Dirac-HartreeBogoliubov approximation (we neglect the Fock term), using a zero-range approximation to the relativistic pairing tensor. We study the effects of the pairing on the properties of the even-even nuclei of the isotopic chains of Ca, Ni and Sn (spherical) and Kr and Sr (deformed), as well as the N =28 isotonic chain, and compare our results with experimental data and with other recent calculations. PACS number(s): 21.65.+f, 72.40.F, 21.60.J

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“…Increasing the number of neutrons in a nucleus causes the nuclear radius to grow according to the A 1/3 rule, while the size of the proton distribution may remain nearly constant. Such a situation was found, e.g., in heavy Na isotopes, where a neutron skin of ∼0.4 fm was observed [3]. The consequence of a neutron skin may be special dripline features.…”

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confidence: 83%

Search for neutron decoupling inO22via the (d,d'γ
Elekes
¹
,
Dombrádi
²
,
Aoi
³

et al. 2006
Phys. Rev. C
18
0
16
0
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We have searched for valence neutron decoupling in 22 O, a phenomenon recently observed in neutron-rich C, B, and lighter O nuclei. From the cross section of the (d, d γ ) reaction for the transition between the ground state and the first 2 + state of 22 O, the neutron and proton deformation parameters have been deduced by distorted wave analysis using and reanalyzing the data of a previous Coulomb excitation measurement. The ratio of the neutron and proton multipole transition matrix elements M n /M p compared to the N/Z value has been derived to be around 1. This result indicates that the 22 O isotope has small and similar neutron and proton deformations, which is consistent with N = 14 shell closure. Thus, the concept of neutron decoupling does not hold for this nucleus. PACS number(s): 23.20. Js, 25.45.De, 27.30.+t During the last few years a deep interest has evolved to explore the unusual features of very neutron-rich nuclei. A possible dripline effect is the development of a thick neutron skin [1], the concept of which is needed also to interpret the Coulomb displacement energies in mirror nuclei [2]. Increasing the number of neutrons in a nucleus causes the nuclear radius to grow according to the A 1/3 rule, while the size of the proton distribution may remain nearly constant. Such a situation was found, e.g., in heavy Na isotopes, where a neutron skin of ∼0.4 fm was observed [3]. The consequence of a neutron skin may be special dripline features. According to theoretical calculations, the most specific excitation mode of nuclei with a thick neutron skin is the isoscalar quadrupole excitation of the skin, which is a large-amplitude motion decoupled from the rest of the nucleus [4,5]. Recently, as a result of incorporation of the continuum coupling into the quasiparticle random phase approximation, calculations predicted a surface neutron quadrupole mode associated with a bound 2 + state [6][7][8]. The strength of the neutron contribution is expected to be proportional to the number of neutrons in the neutron skin [6,7]. In self-consistent calculations, where the effect of the shell closure is also taken into account [8], a bell-shaped strength distribution as a function of mass is predicted similar to the mass dependence of the quadrupole electromagnetic transition probability, but the neutron strength is calculated to be several times larger than the electromagnetic one for the oxygen isotopic chain.Indeed, a significant enhancement of the neutron transition probability has been measured both for 18 O and 20 O [9,10].Both from experimental systematics [9] and theoretical considerations [8], a large neutron transition probability is expected also for 22 O. To observe the evolution of nuclear structure effects as the dripline is approached at 24 O, we studied the neutron transition probability in 22 O by use of the (d, d γ ) process. In a parallel work, the (p, p ) reaction [which has a different sensitivity for protons and neutrons than the (d, d ) probe] was applied [11] for this purpose.In our experi...

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Neutron Skin of Na Isotopes Studied via Their Interaction Cross Sections

Cited by 213 publications

References 19 publications

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

Dirac-Hartree-Bogoliubov approximation for finite nuclei

Search for neutron decoupling inO22via the (d,d'γ
Elekes
¹
,
Dombrádi
²
,
Aoi
³

et al. 2006
Phys. Rev. C
18
0
16
0
View full text Add to dashboard Cite

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Neutron Skin of Na Isotopes Studied via Their Interaction Cross Sections

Cited by 213 publications

References 19 publications

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

Nuclear surface diffuseness revealed in nucleon-nucleus diffraction

Dirac-Hartree-Bogoliubov approximation for finite nuclei

Search for neutron decoupling inO22via the (d,d'γElekes1, Dombrádi2, Aoi3 et al. 2006Phys. Rev. C180160View full textAdd to dashboardCite

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Search for neutron decoupling inO22via the (d,d'γ
Elekes
¹
,
Dombrádi
²
,
Aoi
³

et al. 2006
Phys. Rev. C
18
0
16
0
View full text Add to dashboard Cite