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  1. Book ; Online: Neutron-skin values and matter and neutron radii determined from reaction cross sections of proton scattering on $^{12}$C, $^{40,48}$Ca, $^{58}$Ni, $^{208}$Pb

    Wakasa, Tomotsugu / Tagami, Shingo / Matsui, Jun / Takechi, Maya / Yahiro, Masanobu

    2022  

    Abstract: Very lately, the PREX and the CREX collaboration present skin values, $r_{\rm skin}^{208}({\rm newPREX2}) =0.278 \pm 0.078\ {\rm (exp)} \pm 0.012\ {\rm (theor.)}\,{\rm fm}$ and $r_{\rm skin}^{48}=0.121 \pm 0.026\ {\rm (exp)} \pm 0.024\ {\rm (model)}$, ... ...

    Abstract Very lately, the PREX and the CREX collaboration present skin values, $r_{\rm skin}^{208}({\rm newPREX2}) =0.278 \pm 0.078\ {\rm (exp)} \pm 0.012\ {\rm (theor.)}\,{\rm fm}$ and $r_{\rm skin}^{48}=0.121 \pm 0.026\ {\rm (exp)} \pm 0.024\ {\rm (model)}$, respectively. We recently determined a neutron-skin value $r_{\rm skin}^{208}=0.278 \pm 0.035$fm from measured reaction cross sections $\sigma_{\rm R}({\rm exp})$ of p+$^{208}$Pb scattering in a range of incident energies $10 \lsim E_{\rm in} \lsim 100$ MeV where the chiral (Kyushu) $g$-matrix folding model is reliable for $^{12}$C+$^{12}$C scattering. The data $\sigma_{\rm R}({\rm exp})$ are available for proton scattering on $^{58}$Ni, $^{40,48}$Ca, $^{12}$C targets. Our first aim is to test the Kyushu $g$-matrix folding model for p+$^{208}$Pb scattering in $20 \lsim E_{\rm in} \lsim 180$ MeV. Our second aim is to determine skin values $r_{\rm skin}$ and matter and neutron radii, $r_{\rm m}$ and $r_{\rm n}$, for $^{208}$Pb, $^{58}$Ni, $^{40,48}$Ca, $^{12}$C from the $\sigma_{\rm R}({\rm exp})$. Our method is the Kyushu $g$-matrix folding model with the densities scaled from the D1S-GHFB+AMP densities, where D1S-GHFB+AMP stands for Gogny-D1S HFB (GHFB) with the angular momentum projection (AMP). As for proton scattering, we find that our model is reliable in $20 \lsim E_{\rm in} \lsim 180$ MeV. For $^{208}$Pb, the skin value deduced from $\sigma_{\rm R}({\rm exp})$ in $20 \lsim E_{\rm in} \lsim 180$ MeV is $r_{\rm skin}^{208}(\sigma_{\rm R})=0.299 \pm 0.020$ fm. Our results on $r_{\rm skin}$ are compared with the previous works. Our result $r_{\rm skin}^{208}(\sigma_{\rm R}) = 0.299 \pm 0.020$ fm agrees with $r_{\rm skin}^{208}({\rm PREX2}) = 0.283\pm 0.071$ fm. In addition, our result $r_{\rm skin}^{48}=0.103 \pm 0.022$ fm is consistent with the CREX value.
    Keywords Nuclear Theory
    Subject code 612
    Publishing date 2022-11-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Online: Neutron skin of $^{48}$Ca consistent with experimental data on skins

    Tagami, Shingo / Matsui, Jun / Takechi, Maya / Yahiro, Masanobu

    2020  

    Abstract: Background]: In our previous paper, we predicted $r_{\rm skin}$, $r_{\rm p}$, $r_{\rm n}$, $r_{\rm m}$ for $^{40-60,62,64}$Ca after determining the neutron dripline, using the Gogny-D1S HFB with and without the angular momentum projection (AMP). We ... ...

    Abstract [Background]: In our previous paper, we predicted $r_{\rm skin}$, $r_{\rm p}$, $r_{\rm n}$, $r_{\rm m}$ for $^{40-60,62,64}$Ca after determining the neutron dripline, using the Gogny-D1S HFB with and without the angular momentum projection (AMP). We found that effects of the AMP are small. Very lately, Tanaka {\it et al.} measured interaction cross sections $\sigma_{\rm I}$ for $^{42-51}$Ca, determined $r_{\rm m}$ from the $\sigma_{\rm I}$, and deduced skin $r_{\rm skin}$ and $r_{\rm n}$ from the $r_{\rm m}$ and the $r_{\rm p}(\rm {exp})$ evaluated from the electron scattering. Comparing our results with the data, we find for $^{42-48}$Ca that GHFB and GHFB+AMP reproduce the data on $r_{\rm skin}$, $r_{\rm n}$, $r_{\rm m}$, but not for $r_{\rm p}(\rm {exp})$. [Aim]: Our purpose is to determine a value of $r_{\rm skin}^{48}$ by using GHFB+AMP and the constrained GHFB (cGHFB) in which the calculated value is fitted to $r_{\rm p}(\rm {exp})$. [Results]: For $^{42,44,46,48}$Ca, cGHFB hardly changes $r_{\rm skin}$, $r_{\rm m}$, $r_{\rm n}$ calculated with GHFB+AMP, except for $r_{\rm skin}^{48}$. For $r_{\rm skin}^{48}$, the cGHFB result is $r_{\rm skin}^{48}=0.190$fm, while $r_{\rm skin}^{48}=0.159$fm for GHFB+AMP. We should take the upper and the lower bound of GHFB+AMP and cGHFB. The result $r_{\rm skin}^{48}=0.159-0.190$fm consists with the $r_{\rm skin}^{48}(\sigma_{\rm I})$ and the data $r_{\rm skin}^{48}(\rm $E1$pE)$ obtained from high-resolution $E1$ polarizability experiment ($E1$pE). Using the $r_{\rm skin}^{48}$-$r_{\rm skin}^{208}$ relation with strong correlation of Ref.[3], we transform the data $r_{\rm skin}^{208}$ determined by PREX and $E1$pE to the corresponding values, $r_{\rm skin}^{48}(\rm tPREX)$ and $r_{\rm skin}^{48}(\rm t$E1$pE)$. Our result is consistent also for $r_{\rm skin}^{48}(\rm tPREX)$ and $r_{\rm skin}^{48}(\rm t$E1$pE)$.
    Keywords Nuclear Theory ; Nuclear Experiment
    Subject code 571
    Publishing date 2020-05-27
    Publishing country us
    Document type Book ; Online
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  3. Book ; Online: Chiral $g$-matrix model for reaction cross section of proton+$^{40}$Ca scattering

    Tagami, Shingo / Takechi, Maya / Matsui, Jun / Wakasa, Tomotsugu / Yahiro, Masanobu

    Matter radius $r_{\rm m}$ and skin $r_{\rm skin}$ for $^{40}$Ca

    2020  

    Abstract: For $^{48}$Ca, we determined $r_{m}$fm and $r_{\rm skin}$fm from the central values of $\sigma_{\rm R}({\rm EXP})$ of p+$^{48}$Ca scattering, using the chiral (Kyushu) $g$-matrix folding model with the GHFB+AMP densities. For $^{40}$Ca, Zenihiro {\it et ... ...

    Abstract For $^{48}$Ca, we determined $r_{m}$fm and $r_{\rm skin}$fm from the central values of $\sigma_{\rm R}({\rm EXP})$ of p+$^{48}$Ca scattering, using the chiral (Kyushu) $g$-matrix folding model with the GHFB+AMP densities. For $^{40}$Ca, Zenihiro {\it et al.} determined $r_n({\rm RCNP})=3.375$~fm and $r_{\rm skin}({\rm RCNP})=-0.01 \pm 0.023$fm from the differential cross section and the analyzing powers for p+$^{40}$Ca scattering. For $^{40}$Ca, $\sigma_{\rm R}({\rm EXP})$ are available with high accuracy. Our aim is to determine matter radius $r_{m}^{40}$ and skin $r_{\rm skin}^{40}$ from $\sigma_{\rm R}({\rm EXP})$ by using the Kyushu $g$-matrix folding model with the GHFB+AMP densities. We first determine $r_m({\rm RCNP})=3.380$fm from the central value -0.01~fm of $r_{\rm skin}({\rm RCNP})$ and $r_p({\rm RCNP})=3.385$fm. The folding model with the GHFB+AMP densities reproduces $\sigma_{\rm R}({\rm EXP})$ in $30 \leq E_{\rm in} \leq 180$MeV, in 2-$\sigma$ level. We scale the GHFB+AMP densities so as to $r_p({\rm AMP})=r_p({\rm RCNP})$ and $r_n({\rm AMP})=r_n({\rm RCNP})$. The $\sigma_{\rm R}({\rm RCNP})$ thus obtained agrees with the original one $\sigma_{\rm R}({\rm AMP})$ for each $E_{\rm in}$. For $E_{\rm in}=180$MeV, we define $F$ as $F=\sigma_{\rm R}({\rm EXP})/\sigma_{\rm R}({\rm AMP})=0.929$. The $F\sigma_{\rm R}({\rm AMP})$ be much the same as the center values of $\sigma_{\rm R}({\rm EXP})$ in $30 \leq E_{\rm in} \leq 180$MeV. We then determine $r_{\rm m}^{40}({\rm EXP})$ from the center values of $\sigma_{\rm R}({\rm EXP})$, using $\sigma_{\rm R}({\rm EXP})=C r_{m}^{2}({\rm EXP})$ with $C=r_{m}^{2}({\rm AMP})/(F\sigma_{\rm R}({\rm AMP}))$. The $r_{m}({\rm EXP})$ are averaged over $E_{\rm in}$. The averaged value is $r_{m}({\rm EXP})=3.380$fm. Eventually, we obtain $r_{\rm skin}({\rm EXP})=-0.01$fm from the averaged $r_{\rm m}({\rm EXP})$~fm and $r_p({\rm PCNP})=3.385$fm.
    Keywords Nuclear Theory ; Nuclear Experiment
    Subject code 612
    Publishing date 2020-12-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Book ; Online: Neutron skin $r_{\rm skin}^{208}$ determined from reaction cross section for proton scattering

    Tagami, Shingo / Wakasa, Tomotsugu / Matsui, Jun / Takechi, Maya / Yahiro, Masanobu

    A preliminary result of PREX-II

    2020  

    Abstract: Reaction cross sections $\sigma_{\rm R}({\rm EXP})$ are available as a function of $E_{\rm lab}$ for $p$+$^{208}$Pb scattering. We tested the chiral (Kyushu) $g$-matrix folding model for $^{12}$C scattering on $^{9}$Be, $^{12}$C, $^{27}$Al targets in $30 ...

    Abstract Reaction cross sections $\sigma_{\rm R}({\rm EXP})$ are available as a function of $E_{\rm lab}$ for $p$+$^{208}$Pb scattering. We tested the chiral (Kyushu) $g$-matrix folding model for $^{12}$C scattering on $^{9}$Be, $^{12}$C, $^{27}$Al targets in $30 \lsim E_{\rm lab} \lsim 400 $~MeV. We found that the Kyushu $g$-matrix folding model is reliable for $\sigma_{\rm R}$ in $30 \lsim E_{\rm lab} \lsim 100 $MeV and $250 \lsim E_{\rm lab} \lsim 400$MeV. We determine $r_{\rm skin}^{208}({\rm EXP})$ from $\sigma_{\rm R}({\rm EXP})$ for $p$+$^{208}$Pb scattering in $30 \leq E_{\rm lab} \leq 100$MeV, using the Kyushu $g$-matrix folding model with the densities calculated with Gongny-D1S HFB (GHFB) with and without the angular momentum projection (AMP). The Kyushu $g$-matrix folding model with the GHFB+AMP densities underestimate $\sigma_{\rm R}$ in $30 \leq E_{\rm in} \leq 100$MeV by 0.97. Since the $r_{\rm m}({\rm AMP})$ calculated with GHFB+AMP is close to the lower bound 5.54fm of $r_{\rm m}({\rm PREX})$, we can identify the $\sigma_{\rm R}({\rm AMP})$ with the lower bound of $\sigma_{\rm R}({\rm PREX})$. The $r_{\rm p}({\rm PREX})$ and $r_{\rm n}({\rm PREX})$ in PREX are most reliable. The $r_{\rm p}({\rm AMP})$ and $r_{\rm n}({\rm AMP})$ slightly underestimate the central value $r_{\rm p}({\rm PREX})=$5.45~fm by 0.1\% and the central value $r_{n}({\rm PREX})=$5.78fm by 3.6\%, respectively. The small deviation allows us to scale the GHFB+AMP densities so as to reproduce $\sigma_{\rm R}({\rm EXP})$. In $E_{\rm in}=30 \sim 100$MeV, we determine the $r_{m}$ from measured $\sigma_{\rm R}({\rm EXP})$ and take the weighted mean and its error. The value is $r_{m}=5.616 \pm 0.022$fm, leading to $r_{\rm skin}^{208}=0.27 \pm 0.03$fm. Our result $r_{\rm skin}^{208}({\rm EXP})=0.27 \pm 0.03$~fm is consistent with a preliminary result of PREX-II.
    Keywords Nuclear Theory ; Nuclear Experiment
    Subject code 612
    Publishing date 2020-10-05
    Publishing country us
    Document type Book ; Online
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  5. Book ; Online: Reanalyses for $^{42-51}$Ca scattering on a $^{12}$C target at $280$ MeV/nucleon based on chiral $g$ folding mode with Gogny-D1S Hartree-Fock-Bogoliubov densities

    Takechi, Maya / Wakasa, Tomotsugu / Matsui, Shingo Tagami Jun / Yahiro, Masanobu

    2020  

    Abstract: In the previous paper, we predicted reaction cross sections $\sigma_{\rm R}$ for $^{40-60,62,64}$Ca+$^{12}$C scattering at $280$~MeV/nucleon, since Tanaka {\it el al.} measured interaction cross sections $\sigma_{\rm I}$ for $^{42-51}$Ca in RIKEN and ... ...

    Abstract In the previous paper, we predicted reaction cross sections $\sigma_{\rm R}$ for $^{40-60,62,64}$Ca+$^{12}$C scattering at $280$~MeV/nucleon, since Tanaka {\it el al.} measured interaction cross sections $\sigma_{\rm I}$ for $^{42-51}$Ca in RIKEN and determined neutron skin $r_{\rm skin}({\rm RIKEN})$ using the optical limit of the Glauber model with the Woos-Saxon densities. Our purpose is to reanalyze the $r_{\rm skin}$ from the $\sigma_{\rm I}$. Our analysis is superior to theirs, since the chiral $g$-matrix folding model (the GHFB and GHFB+AMP densities) is much better than the optical limit of the Glauber model (the Woos-Saxon densities). Our model is the chiral $g$-matrix folding model with the densities scaled from the GHFB and GHFB+AMP densities. We scale the GHFB and GHFB+AMP densities so that the $\sigma_{\rm R}$ of the scaled densities can agree with the central values of $\sigma_{\rm I}$ under the condition that the proton radius of the scaled proton density equals the data determined from the isotope shift based on the electron scattering. The $r_{\rm skin}$ thus determined are close to their results $r_{\rm skin}^{42-51}({\rm RIKEN})$. For $^{48}$Ca, our value $r_{\rm skin}^{48}$ is 0.105 $\pm$ 0.06~fm, while their value is $r_{\rm m}^{48}({\rm RIKEN})=0.146 \pm 0.06$~fm. We take the weighted mean and its error of $r_{\rm skin}^{48}(\sigma_{\rm I})= 0.105 \pm 0.06$~fm and $r_{\rm skin}^{48}(E1{\rm pE}) =0.17 \pm 0.03$~fm of the high-resolution $E1$ polarizability experiment (E1{\rm pE}). Our final result is $r_{\rm skin}^{48}=0.157 \pm 0.027$~fm. Our conclusion is $r_{\rm skin}^{48}=0.157 \pm 0.027$~fm for $^{48}$Ca. For $^{42-47,49-51}$Ca, our results on $r_{\rm skin}$ are similar to theirs. Our result for $^{48}$Ca is related to CREX.

    Comment: 6 pages, 3 figure
    Keywords Nuclear Theory ; Nuclear Experiment
    Subject code 612
    Publishing date 2020-09-01
    Publishing country us
    Document type Book ; Online
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  6. Article ; Online: A new approach for deducing rms proton radii from charge-changing reactions of neutron-rich nuclei and the reaction-target dependence.

    Zhang, Jichao / Sun, Baohua / Tanihata, Isao / Kanungo, Rituparna / Scheidenberger, Christoph / Terashima, Satoru / Wang, Feng / Ameil, Frederic / Atkinson, Joel / Ayyad, Yassid / Bagchi, Soumya / Cortina-Gil, Dolores / Dillmann, Iris / Estradé, Alfredo / Evdokimov, Alexey / Farinon, Fabio / Geissel, Hans / Guastalla, Giulia / Janik, Rudolf /
    Kaur, Satbir / Knöbel, Ronja / Kurcewicz, Jan / Litvinov, Yury / Marta, Michele / Mostazo, Magdalena / Mukha, Ivan / Nociforo, Chiara / Ong, Hooi Jin / Pietri, Stephane / Prochazka, Andrej / Sitar, Branislav / Strmen, Peter / Takechi, Maya / Tanaka, Junki / Vargas, Jossitt / Weick, Helmut / Winfield, John Stuart

    Science bulletin

    2024  

    Abstract: We report the charge-changing cross sections ( ... ...

    Abstract We report the charge-changing cross sections (σ
    Language English
    Publishing date 2024-03-26
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2816140-3
    ISSN 2095-9281 ; 2095-9273
    ISSN (online) 2095-9281
    ISSN 2095-9273
    DOI 10.1016/j.scib.2024.03.051
    Database MEDical Literature Analysis and Retrieval System OnLINE

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