Polarization creation in proton-rich 28 P via charge exchange reactions and measurement of its electric quadrupole moment

Matsuta, K.; Mihara, M.; Zhou, Dongmei; Zheng, Y.; Nishimura, D.; Nakamura, Takashi; Yuan, Daqing; Momota, S.; Izumikawa, T.; Zuo, Yi; Fan, Ping; Zhu, Shengyun; Ohtsubo, T.; Fukuda, Mitsuhiro; Namiki, Y.; Nagashima, M.; Minamisono, T.; Kameda, D.; Sumikama, T.; Kitagawa, A.; Kanazawa, M.; Torikoshi, M.; Sato, Shinji; Matsumiya, R.; Komurasaki, J.; Ishikawa, D.; Hirano, H.; Takahashi, S.; Kubo, T.; Yamada, Ryuta; Shimbara, Y.; Nojiri, Y.; Suzuki, Toshio; Zhang, X. Z.; Alonso, J.; Krebs, G. F.; Symons, T. J. M.

doi:10.1007/s10751-010-0253-9

“…According to the above analysis, it is implied that the nucleon knockout reaction produces remarkably small nuclear polarization. In our previous study [3], P I of 28 P, which was produced through a charge exchange reaction with a CH 2 target, was smaller than that produced with a Be-target. The primary peak component in the momentum distribution of 28 P produced with a CH 2 target is significantly dominant; these results are consistent with the present result.…”

Section: Resultsmentioning

confidence: 75%

“…In the case of proton rich nuclei, contaminated isotones, which cannot be easily separated from objective nuclei by means of fragment separator, usually causes a reduction in the observed asymmetry of beta-ray emission. Recently, our group observed the nuclear polarization of beta-emitting nuclei, which were produced through a charge exchange reaction [2], [3]. In the present study, the polarization phenomenon was examined based on experimental results for 28 P.…”

Section: Introductionmentioning

confidence: 96%

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momota

¹

,

Mihara

²

,

Nishimura

³

et al. 2012

Hyperfine Interact

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In order to investigate the polarization process in charge exchange reactions, we observed the momentum and angular distribution as well as nuclear polarization of a proton-rich beta-emitting nucleus, 28 P (I π =3 + , T 1/2 = 270 msec), produced through the reaction 28 Si+ 9 Be at E=100 MeV/u, by selecting the momentum and the ejection angle. An analysis by using double Gaussian functions resolved the observed momentum distribution into two reaction components, nucleon knockout and pick-up abrasion reactions, suggested in a previous study. The behavior of the observed angular distribution and nuclear polarization implies the influence of those two components. The momentum dependence of the observed nuclear polarization of 28 P could be consistently reproduced by a simple model, in which two reaction components are considered. The 2 present study also shows that the charge exchange reaction at intermediate energy is a useful method to produce polarized beta-emitting nuclei, especially for proton-rich nuclei.

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“…In the case of proton rich nuclei, contaminated isotones, which cannot be easily separated from objective nuclei by means of fragment separator, usually causes a reduction in the observed asymmetry of beta-ray emission. Recently, our group observed the nuclear polarization of beta-emitting nuclei, which were produced through a charge exchange reaction [2], [3]. In the present study, the polarization phenomenon was examined based on experimental results for 28 P.…”

Section: Introductionmentioning

confidence: 96%

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momota¹,

Mihara²,

Nishimura³

et al. 2012

Hfi / Nqi 2012

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0

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In order to investigate the polarization process in charge exchange reactions, we observed the momentum and angular distribution as well as nuclear polarization of a proton-rich beta-emitting nucleus, 28 P (I π =3 + , T 1/2 = 270 msec), produced through the reaction 28 Si+ 9 Be at E=100 MeV/u, by selecting the momentum and the ejection angle. An analysis by using double Gaussian functions resolved the observed momentum distribution into two reaction components, nucleon knockout and pick-up abrasion reactions, suggested in a previous study. The behavior of the observed angular distribution and nuclear polarization implies the influence of those two components. The momentum dependence of the observed nuclear polarization of 28 P could be consistently reproduced by a simple model, in which two reaction components are considered. The 2 present study also shows that the charge exchange reaction at intermediate energy is a useful method to produce polarized beta-emitting nuclei, especially for proton-rich nuclei.

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The ab initio Calculation of Electric Field Gradient at the Site of P Impurity in α-Al ₃ O ₂

Zhang¹,

Yuan²,

Zhang³

et al. 2012

Chinese Phys. Lett.

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An ab initio calculation of the electric-field gradient (EFG) at the site of a phosphorous impurity substituting an Al atom in α-Al2O3 is carried out using the WIEN2k code with the full-potential linearized augmented plane wave plus local orbital method (LAPW+lo) in the frame of density functional theory. The atomic lattice relaxations caused by the implanted impurities were calculated for two different charged states to well describe the electronic structure of the doped system. The EFG at the site of the phosphorous impurity in the charged supercell calculated with the exchange-correlation potential of the Wu-Cohen generalized gradient approximation (WC-GGA) is 0.573 × 1021 V/m2. Then, the nuclear quadrupole moment of the I = 3 state in 28P is deduced to be 137 mb from the quadrupole interaction frequency of 190 kHz measured recently by the β-NQR method.

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Polarization creation in proton-rich 28 P via charge exchange reactions and measurement of its electric quadrupole moment

Cited by 3 publications

References 3 publications

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

The ab initio Calculation of Electric Field Gradient at the Site of P Impurity in α-Al ₃ O ₂

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Polarization creation in proton-rich 28 P via charge exchange reactions and measurement of its electric quadrupole moment

Cited by 3 publications

References 3 publications

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

Momentum dependence of spin polarization for beta emitting nuclei produced through charge exchange reaction at intermediate energy

The ab initio Calculation of Electric Field Gradient at the Site of P Impurity in α-Al 3 O 2

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The ab initio Calculation of Electric Field Gradient at the Site of P Impurity in α-Al ₃ O ₂