Neutron Spectroscopic Factors from Isobaric Analog States

Thompson, William J.; Adams, Jeffrey A.; Robson, D.

doi:10.1103/physrev.173.975

Cited by 133 publications

(11 citation statements)

References 20 publications

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“…First of all, we searched for the resonance parameters, resonance energies E R , Γ p , and the total widths Γ total , assuming four IARs which can be expected from the known bound states in 35 Si. The minimum χ 2 was searched by changing the parameters in the R-matrix curves which were calculated using the optical potential phase shift [19] with the global optical model parameter [22]. The resultant curve which was shown by the dashed line (15) 2194(15) 20.9(120) 32.0(220) 0.12 (7) in Fig.…”

Section: Proton Resonance Elastic Scattering On 34 Simentioning

confidence: 99%

Nuclear structure around [sup 32]Mg via proton resonance elastic scattering

Imai

2013

AIP Conference Proceedings

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The magicity of the neutron number N = 20 at the neutron-rich nucleus 32 Mg was considered to disappear due to a drastic change of the shell structure. Investigating the single-particle structure around 32 Mg can give us a further insight into the origin of the variation. We studied the single particle structure of 35 Si and 31 Mg through measuring the isobaric analog resonances of the low-lying bound states in both nuclei by employing the proton resonance elastic scattering with the thick target inverse kinematic method.

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Section: Proton Resonance Elastic Scattering On 34 Simentioning

confidence: 99%

Nuclear structure around [sup 32]Mg via proton resonance elastic scattering

Imai

2013

AIP Conference Proceedings

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“…This is in contrast to the study of the neutron singleparticle structure of neutron-rich nuclei, for which the TTIK method has been only applied to the unbound nucleus 9 He using the p( 8 He, p) reaction. In that work 8 He beams of several MeV in the c.m.…”

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confidence: 98%

“…When the analog state is above the proton separation energy, the state will be observed in the proton elastic scattering excitation function of a target nucleus A Z as a resonance, called the isobaric analog resonance (IAR). The resonance energy, width, and J π can be obtained from the excitation function by R-matrix analysis [8,9].For unstable nuclei, the proton resonance scattering with thick target inverse kinematics (TTIK) is useful [10] for obtaining the excitation function of the proton elastic scattering. At 0 degrees in the lab.…”

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Proton resonance elastic scattering in inverse kinematics on the medium heavy nucleus 68Zn

et al. 2010

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Abstract. An isobaric analog resonance of 69 Zn was studied by the resonance elastic scattering of p( 68 Zn, p) with a 5.5 MeV/nucleon 68 Zn beam and a thick polyethylene target. The excitation function of the differential cross-section of proton elastic scattering was measured around 0 degrees in the laboratory frame by the thick target inverse kinematics method. The angular momentum, and proton and total widths of the resonance assigned using an R-matrix calculation are in good agreement with earlier measurements performed using normal kinematics, demonstrating that the thick target inverse kinematics method is a useful tool for studying the single-particle structures of neutron-rich nuclei.Systematic studies of the neutron single-particle states in neutron-rich nuclei give direct evidence of shell evolution with increasing neutron richness, thereby providing a test of current nuclear-structure models. These states are also important for determining the cross-sections of neutron radiative capture reactions in r-process nucleosynthesis. The recent advent of radioactive ion beam (RIB) facilities provides opportunities for investigating the states of neutron-rich nuclei located far from the stability line by direct reactions.A straightforward way to study neutron single-particle states in neutron-rich nuclei is the one-nucleon transfer reaction, e.g., (d, p) reaction, in inverse kinematics [1][2][3]. The final states in these reactions are identified by measuring the proton energy. The spin-parities (J π ) and spectroscopic factors are extracted from the angular distributions of differential cross-sections around 0 degrees in the center-of-mass (c.m.) frame. 0 degrees in the c.m. frame corresponds to 180 degrees in the laboratory (lab.) frame, where the energies of protons are often too low to separate the neighboring states, particularly for heavy nuclei which have highly crowded level densities [3]. In order to measure the low-energy protons in wide angular range and to improve the reconstructed energy resolution in the c.m. frame, a large solid-angle silicon semiconductor detectors a e-mail: nobuaki.imai@kek.jp (SSDs) array with a high segmentation [4][5][6][7] is often employed.The same spectroscopic information can be obtained by investigating the isobaric analog resonances of the final states through measuring proton resonance elastic scattering at a few points of scattering angles. Under the assumption of isospin symmetry, the neutron single-particle configuration of states in a nucleus A+1 Z would be the same as the proton single-particle configuration of states at the high excitation energies in the neighboring nucleus A+1 (Z + 1), called isobaric analog states. When the analog state is above the proton separation energy, the state will be observed in the proton elastic scattering excitation function of a target nucleus A Z as a resonance, called the isobaric analog resonance (IAR). The resonance energy, width, and J π can be obtained from the excitation function by R-matrix analysis [8,9].For unstable n...

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“…When the analog state is above the proton separation energy S p , the state is observed in the excitation function of elastic scattering on a target nucleus 34 Si as a resonance, called IAR. The resonance energy E R , spectroscopic factor S, and angular momentum l can be deduced by R-matrix analysis [14,15] on the excitation function of differential cross sections at a given scattering angle.…”

Section: Introductionmentioning

confidence: 99%

Isobaric analog resonances of theN=21nucleus35Si

et al. 2012

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Neutron single-particle states in the neutron-rich nucleus 35 Si, which is located beside the N = 20 shell breaking nucleus 32 Mg, were investigated through their isobaric analog resonances. The excitation function for 34 Si+p elastic scattering was measured around 0 • in the laboratory frame by the thick target inverse kinematics method with a 34 Si beam around 5 MeV/nucleon and a thick polyethylene target. Eight resonances were successfully observed. Angular momenta and proton and total widths of the resonances were assigned using R-matrix analysis. With the help of information of the β decay study, six isobaric analog resonances were identified. Spectroscopic factors and spin-parities of the corresponding parent states in 35 Si are presented.

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Neutron Spectroscopic Factors from Isobaric Analog States

Cited by 133 publications

References 20 publications

Nuclear structure around [sup 32]Mg via proton resonance elastic scattering

Nuclear structure around [sup 32]Mg via proton resonance elastic scattering

Proton resonance elastic scattering in inverse kinematics on the medium heavy nucleus 68Zn

Isobaric analog resonances of theN=21nucleus35Si

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