Probing the Symmetry Energy with the Spectral Pion Ratio

(SπRIT Collaboration)

doi:10.1103/PhysRevLett.126.162701

Probing the Symmetry Energy with the Spectral Pion Ratio

(SπRIT Collaboration)

Department of Physics

Research output: Contribution to journal › Article › peer-review

78 Citations (Scopus)

Abstract

Many neutron star properties, such as the proton fraction, reflect the symmetry energy contributions to the equation of state that dominate when neutron and proton densities differ strongly. To constrain these contributions at suprasaturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be 42<L<117 MeV. This value is slightly lower but consistent with the L values deduced from a recent measurement of the neutron skin thickness of Pb208.

Original language	English
Article number	162701
Journal	Physical review letters
Volume	126
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.126.162701
Publication status	Published - 2021 Apr 19

Bibliographical note

Funding Information:
The authors would like to thank Professor Hermann Wolter, Professor Che-Ming Ko, and Professor Pawel Danielewicz and the TMEP Collaboration for many fruitful discussions. This work was supported by the U.S. Department of Energy under Awards No. DE-SC0021235, No. DE-NA0003908, No. DE-FG02-93ER40773, No. DE-FG02-93ER40773, No. DE-SC0019209, No. DE-SC0015266, No. DE-AC02-05CH11231, U.S. National Science Foundation Grant No. PHY-1565546, the Robert A. Welch Foundation (A-1266 and A-1358), the Japanese MEXT, Japan KAKENHI (Grant-in-Aid for Scientific Research on Innovative Areas) Grant No. 24105004, JSPS KAKENHI Grants No. JP16H02179 and No. JP18H05404, the National Research Foundation of Korea under Grants No. 2016K1A3A7A09005578, No. 2018R1A5A1025563, No. 2013M7A1A1075764, the Polish National Science Center (NCN) under Contracts No. UMO-2013/09/B/ST2/04064, No. UMO-2013/-10/M/ST2/00624, the National Natural Science Foundation of China under Grant No. 11375094 and the Tsinghua University Initiative Scientific Research Program, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2094–390783311 (ORIGINS), Project-ID 279384907 - SFB1245, the BMBF via Projects No. 05P15RDFN1, No. EXC-2094-390783311 and the Romanian Ministry of Education and Research through Contract No. PN 19 06 01 01/2019-2022. Computing resources were provided by the NSCL, the HOKUSAI-Great Wave system at RIKEN, and the Institute for Cyber-Enabled Research at Michigan State University.

Publisher Copyright:
© 2021 American Physical Society.

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.126.162701

Cite this

@article{6edcd751a2ba45b1b9f197f7a3a8d16d,

title = "Probing the Symmetry Energy with the Spectral Pion Ratio",

abstract = "Many neutron star properties, such as the proton fraction, reflect the symmetry energy contributions to the equation of state that dominate when neutron and proton densities differ strongly. To constrain these contributions at suprasaturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be 42<L<117 MeV. This value is slightly lower but consistent with the L values deduced from a recent measurement of the neutron skin thickness of Pb208.",

author = "{(SπRIT Collaboration)} and J. Estee and Lynch, {W. G.} and Tsang, {C. Y.} and J. Barney and G. Jhang and Tsang, {M. B.} and R. Wang and M. Kaneko and Lee, {J. W.} and T. Isobe and M. Kurata-Nishimura and T. Murakami and Ahn, {D. S.} and L. Atar and T. Aumann and H. Baba and K. Boretzky and J. Brzychczyk and G. Cerizza and N. Chiga and N. Fukuda and I. Gasparic and B. Hong and A. Horvat and K. Ieki and N. Inabe and Kim, {Y. J.} and T. Kobayashi and Y. Kondo and P. Lasko and Lee, {H. S.} and Y. Leifels and J. {\L}ukasik and J. Manfredi and McIntosh, {A. B.} and P. Morfouace and T. Nakamura and N. Nakatsuka and S. Nishimura and H. Otsu and P. Paw{\l}owski and K. Pelczar and D. Rossi and H. Sakurai and C. Santamaria and H. Sato and H. Scheit and R. Shane and Y. Shimizu and H. Simon",

note = "Funding Information: The authors would like to thank Professor Hermann Wolter, Professor Che-Ming Ko, and Professor Pawel Danielewicz and the TMEP Collaboration for many fruitful discussions. This work was supported by the U.S. Department of Energy under Awards No. DE-SC0021235, No. DE-NA0003908, No. DE-FG02-93ER40773, No. DE-FG02-93ER40773, No. DE-SC0019209, No. DE-SC0015266, No. DE-AC02-05CH11231, U.S. National Science Foundation Grant No. PHY-1565546, the Robert A. Welch Foundation (A-1266 and A-1358), the Japanese MEXT, Japan KAKENHI (Grant-in-Aid for Scientific Research on Innovative Areas) Grant No. 24105004, JSPS KAKENHI Grants No. JP16H02179 and No. JP18H05404, the National Research Foundation of Korea under Grants No. 2016K1A3A7A09005578, No. 2018R1A5A1025563, No. 2013M7A1A1075764, the Polish National Science Center (NCN) under Contracts No. UMO-2013/09/B/ST2/04064, No. UMO-2013/-10/M/ST2/00624, the National Natural Science Foundation of China under Grant No. 11375094 and the Tsinghua University Initiative Scientific Research Program, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy – EXC-2094–390783311 (ORIGINS), Project-ID 279384907 - SFB1245, the BMBF via Projects No. 05P15RDFN1, No. EXC-2094-390783311 and the Romanian Ministry of Education and Research through Contract No. PN 19 06 01 01/2019-2022. Computing resources were provided by the NSCL, the HOKUSAI-Great Wave system at RIKEN, and the Institute for Cyber-Enabled Research at Michigan State University. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = apr,

day = "19",

doi = "10.1103/PhysRevLett.126.162701",

language = "English",

volume = "126",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "16",

}

TY - JOUR

T1 - Probing the Symmetry Energy with the Spectral Pion Ratio

AU - (SπRIT Collaboration)

AU - Estee, J.

AU - Lynch, W. G.

AU - Tsang, C. Y.

AU - Barney, J.

AU - Jhang, G.

AU - Tsang, M. B.

AU - Wang, R.

AU - Kaneko, M.

AU - Lee, J. W.

AU - Isobe, T.

AU - Kurata-Nishimura, M.

AU - Murakami, T.

AU - Ahn, D. S.

AU - Atar, L.

AU - Aumann, T.

AU - Baba, H.

AU - Boretzky, K.

AU - Brzychczyk, J.

AU - Cerizza, G.

AU - Chiga, N.

AU - Fukuda, N.

AU - Gasparic, I.

AU - Hong, B.

AU - Horvat, A.

AU - Ieki, K.

AU - Inabe, N.

AU - Kim, Y. J.

AU - Kobayashi, T.

AU - Kondo, Y.

AU - Lasko, P.

AU - Lee, H. S.

AU - Leifels, Y.

AU - Łukasik, J.

AU - Manfredi, J.

AU - McIntosh, A. B.

AU - Morfouace, P.

AU - Nakamura, T.

AU - Nakatsuka, N.

AU - Nishimura, S.

AU - Otsu, H.

AU - Pawłowski, P.

AU - Pelczar, K.

AU - Rossi, D.

AU - Sakurai, H.

AU - Santamaria, C.

AU - Sato, H.

AU - Scheit, H.

AU - Shane, R.

AU - Shimizu, Y.

AU - Simon, H.

N1 - Funding Information: The authors would like to thank Professor Hermann Wolter, Professor Che-Ming Ko, and Professor Pawel Danielewicz and the TMEP Collaboration for many fruitful discussions. This work was supported by the U.S. Department of Energy under Awards No. DE-SC0021235, No. DE-NA0003908, No. DE-FG02-93ER40773, No. DE-FG02-93ER40773, No. DE-SC0019209, No. DE-SC0015266, No. DE-AC02-05CH11231, U.S. National Science Foundation Grant No. PHY-1565546, the Robert A. Welch Foundation (A-1266 and A-1358), the Japanese MEXT, Japan KAKENHI (Grant-in-Aid for Scientific Research on Innovative Areas) Grant No. 24105004, JSPS KAKENHI Grants No. JP16H02179 and No. JP18H05404, the National Research Foundation of Korea under Grants No. 2016K1A3A7A09005578, No. 2018R1A5A1025563, No. 2013M7A1A1075764, the Polish National Science Center (NCN) under Contracts No. UMO-2013/09/B/ST2/04064, No. UMO-2013/-10/M/ST2/00624, the National Natural Science Foundation of China under Grant No. 11375094 and the Tsinghua University Initiative Scientific Research Program, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2094–390783311 (ORIGINS), Project-ID 279384907 - SFB1245, the BMBF via Projects No. 05P15RDFN1, No. EXC-2094-390783311 and the Romanian Ministry of Education and Research through Contract No. PN 19 06 01 01/2019-2022. Computing resources were provided by the NSCL, the HOKUSAI-Great Wave system at RIKEN, and the Institute for Cyber-Enabled Research at Michigan State University. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/4/19

Y1 - 2021/4/19

N2 - Many neutron star properties, such as the proton fraction, reflect the symmetry energy contributions to the equation of state that dominate when neutron and proton densities differ strongly. To constrain these contributions at suprasaturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be 42<L<117 MeV. This value is slightly lower but consistent with the L values deduced from a recent measurement of the neutron skin thickness of Pb208.

AB - Many neutron star properties, such as the proton fraction, reflect the symmetry energy contributions to the equation of state that dominate when neutron and proton densities differ strongly. To constrain these contributions at suprasaturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be 42<L<117 MeV. This value is slightly lower but consistent with the L values deduced from a recent measurement of the neutron skin thickness of Pb208.

UR - http://www.scopus.com/inward/record.url?scp=85105275453&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.162701

DO - 10.1103/PhysRevLett.126.162701

M3 - Article

C2 - 33961456

AN - SCOPUS:85105275453

SN - 0031-9007

VL - 126

JO - Physical review letters

JF - Physical review letters

IS - 16

M1 - 162701

ER -

Probing the Symmetry Energy with the Spectral Pion Ratio

Abstract

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