Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F. S. Bergmann; M. Berlowski; H. Bhatt; A. Bondar; M. Buescher; H. Calen; I. Ciepal; H. Clement; E. Czerwinski; K. Demmich; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Foehl; K. Fransson; E. Goldenbaum; A. Goswami; K. Grigoryev; C. -O. Gullstroem; L. Heijkenskjold; V. Hejny; N. Huesken; L. Jarczyk; T. Johansson; B. Kamys; N. G. Kelkar; G. Kemmerling; G. Khatri; A. Khoukaz; O. Khreptak; D. A. Kirillov; S. Kistryn; H. Kleines; B. Klos; W. Krzemien; P. Kulessa; A. Kupsc; A. Kuzmin; K. Lalwani; D. Lersch; B. Lorentz; A. Magierae; R. Maier; P. Marciniewski; B. Marianski; H. -P. Morsch; P. Moskal; H. Ohm; E. Perez del Rio; N. M. Piskunov; D. Prasuhn; D. Pszczel; K. Pysz; A. Pyszniak; J. Ritman; A. Roy; Z. Rudy; O. Rundel; S. Sawant; S. Schadmand; I. Schaetti-Ozerianska; T. Sefzick; V. Serdyuk; B. Shwartz; K. Sitterberg; T. Skorodko; M. Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; E. Stephan; G. Sterzenbach; H. Stockhorst; H. Stroeher; A. Szczurek; A. Trzcinski; R. Varma; M. Wolke; A. Wronska; P. Wuestner; A. Yamamoto; J. Zabierowski; M. J. Zielinski; J. Zlomanczuk; P. Zupranski; M. Zurek

doi:10.1016/j.nuclphysa.2017.01.001

Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berlowski, H. Bhatt, A. Bondar, M. Buescher, H. Calen, I. Ciepal, H. Clement, E. Czerwinski, K. Demmich, R. Engels, A. Erven, W. Erven, W. Eyrich, P. Fedorets, K. FoehlK. Fransson, E. Goldenbaum, A. Goswami, K. Grigoryev, C. -O. Gullstroem, L. Heijkenskjold, V. Hejny, N. Huesken, L. Jarczyk, T. Johansson, B. Kamys, N. G. Kelkar, G. Kemmerling, G. Khatri, A. Khoukaz, O. Khreptak, D. A. Kirillov, S. Kistryn, H. Kleines, B. Klos, W. Krzemien, P. Kulessa, A. Kupsc, A. Kuzmin, K. Lalwani, D. Lersch, B. Lorentz, A. Magierae, R. Maier, P. Marciniewski, B. Marianski, H. -P. Morsch, P. Moskal, H. Ohm, E. Perez del Rio, N. M. Piskunov, D. Prasuhn, D. Pszczel, K. Pysz, A. Pyszniak, J. Ritman, A. Roy, Z. Rudy, O. Rundel, S. Sawant, S. Schadmand, I. Schaetti-Ozerianska, T. Sefzick, V. Serdyuk, B. Shwartz, K. Sitterberg, T. Skorodko, M. Skurzok, J. Smyrski, V. Sopov, R. Stassen, J. Stepaniak, E. Stephan, G. Sterzenbach, H. Stockhorst, H. Stroeher, A. Szczurek, A. Trzcinski, R. Varma, M. Wolke, A. Wronska, P. Wuestner, A. Yamamoto, J. Zabierowski, M. J. Zielinski, J. Zlomanczuk, P. Zupranski, M. Zurek

School of Physics and Astronomy

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

Abstract

The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	102-115
Number of pages	14
Journal	Nuclear Physics A
Volume	959
DOIs	https://doi.org/10.1016/j.nuclphysa.2017.01.001
Publication status	Published - 6 Jan 2017

Keywords

eta-Mesic nuclei
eta meson
QUASI-BOUND STATES
NEAR-THRESHOLD
NUCLEI
SCATTERING
DETECTOR
SYSTEMS

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10.1016/j.nuclphysa.2017.01.001

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Adlarson, P., Augustyniak, W., Bardan, W., Bashkanov, M., Bergmann, F. S., Berlowski, M., Bhatt, H., Bondar, A., Buescher, M., Calen, H., Ciepal, I., Clement, H., Czerwinski, E., Demmich, K., Engels, R., Erven, A., Erven, W., Eyrich, W., Fedorets, P., ... Zurek, M. (2017). Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility. Nuclear Physics A, 959, 102-115. https://doi.org/10.1016/j.nuclphysa.2017.01.001

@article{7e1cd7e22dff45b684abc4869b769709,

title = "Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility",

abstract = "The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.",

keywords = "eta-Mesic nuclei, eta meson, QUASI-BOUND STATES, NEAR-THRESHOLD, NUCLEI, SCATTERING, DETECTOR, SYSTEMS",

author = "P. Adlarson and W. Augustyniak and W. Bardan and M. Bashkanov and Bergmann, {F. S.} and M. Berlowski and H. Bhatt and A. Bondar and M. Buescher and H. Calen and I. Ciepal and H. Clement and E. Czerwinski and K. Demmich and R. Engels and A. Erven and W. Erven and W. Eyrich and P. Fedorets and K. Foehl and K. Fransson and E. Goldenbaum and A. Goswami and K. Grigoryev and Gullstroem, {C. -O.} and L. Heijkenskjold and V. Hejny and N. Huesken and L. Jarczyk and T. Johansson and B. Kamys and Kelkar, {N. G.} and G. Kemmerling and G. Khatri and A. Khoukaz and O. Khreptak and Kirillov, {D. A.} and S. Kistryn and H. Kleines and B. Klos and W. Krzemien and P. Kulessa and A. Kupsc and A. Kuzmin and K. Lalwani and D. Lersch and B. Lorentz and A. Magierae and R. Maier and P. Marciniewski and B. Marianski and Morsch, {H. -P.} and P. Moskal and H. Ohm and {del Rio}, {E. Perez} and Piskunov, {N. M.} and D. Prasuhn and D. Pszczel and K. Pysz and A. Pyszniak and J. Ritman and A. Roy and Z. Rudy and O. Rundel and S. Sawant and S. Schadmand and I. Schaetti-Ozerianska and T. Sefzick and V. Serdyuk and B. Shwartz and K. Sitterberg and T. Skorodko and M. Skurzok and J. Smyrski and V. Sopov and R. Stassen and J. Stepaniak and E. Stephan and G. Sterzenbach and H. Stockhorst and H. Stroeher and A. Szczurek and A. Trzcinski and R. Varma and M. Wolke and A. Wronska and P. Wuestner and A. Yamamoto and J. Zabierowski and Zielinski, {M. J.} and J. Zlomanczuk and P. Zupranski and M. Zurek",

year = "2017",

month = jan,

day = "6",

doi = "10.1016/j.nuclphysa.2017.01.001",

language = "English",

volume = "959",

pages = "102--115",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

}

Adlarson, P, Augustyniak, W, Bardan, W, Bashkanov, M, Bergmann, FS, Berlowski, M, Bhatt, H, Bondar, A, Buescher, M, Calen, H, Ciepal, I, Clement, H, Czerwinski, E, Demmich, K, Engels, R, Erven, A, Erven, W, Eyrich, W, Fedorets, P, Foehl, K, Fransson, K, Goldenbaum, E, Goswami, A, Grigoryev, K, Gullstroem, C-O, Heijkenskjold, L, Hejny, V, Huesken, N, Jarczyk, L, Johansson, T, Kamys, B, Kelkar, NG, Kemmerling, G, Khatri, G, Khoukaz, A, Khreptak, O, Kirillov, DA, Kistryn, S, Kleines, H, Klos, B, Krzemien, W, Kulessa, P, Kupsc, A, Kuzmin, A, Lalwani, K, Lersch, D, Lorentz, B, Magierae, A, Maier, R, Marciniewski, P, Marianski, B, Morsch, H-P, Moskal, P, Ohm, H, del Rio, EP, Piskunov, NM, Prasuhn, D, Pszczel, D, Pysz, K, Pyszniak, A, Ritman, J, Roy, A, Rudy, Z, Rundel, O, Sawant, S, Schadmand, S, Schaetti-Ozerianska, I, Sefzick, T, Serdyuk, V, Shwartz, B, Sitterberg, K, Skorodko, T, Skurzok, M, Smyrski, J, Sopov, V, Stassen, R, Stepaniak, J, Stephan, E, Sterzenbach, G, Stockhorst, H, Stroeher, H, Szczurek, A, Trzcinski, A, Varma, R, Wolke, M, Wronska, A, Wuestner, P, Yamamoto, A, Zabierowski, J, Zielinski, MJ, Zlomanczuk, J, Zupranski, P & Zurek, M 2017, 'Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility', Nuclear Physics A, vol. 959, pp. 102-115. https://doi.org/10.1016/j.nuclphysa.2017.01.001

TY - JOUR

T1 - Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

AU - Adlarson, P.

AU - Augustyniak, W.

AU - Bardan, W.

AU - Bashkanov, M.

AU - Bergmann, F. S.

AU - Berlowski, M.

AU - Bhatt, H.

AU - Bondar, A.

AU - Buescher, M.

AU - Calen, H.

AU - Ciepal, I.

AU - Clement, H.

AU - Czerwinski, E.

AU - Demmich, K.

AU - Engels, R.

AU - Erven, A.

AU - Erven, W.

AU - Eyrich, W.

AU - Fedorets, P.

AU - Foehl, K.

AU - Fransson, K.

AU - Goldenbaum, E.

AU - Goswami, A.

AU - Grigoryev, K.

AU - Gullstroem, C. -O.

AU - Heijkenskjold, L.

AU - Hejny, V.

AU - Huesken, N.

AU - Jarczyk, L.

AU - Johansson, T.

AU - Kamys, B.

AU - Kelkar, N. G.

AU - Kemmerling, G.

AU - Khatri, G.

AU - Khoukaz, A.

AU - Khreptak, O.

AU - Kirillov, D. A.

AU - Kistryn, S.

AU - Kleines, H.

AU - Klos, B.

AU - Krzemien, W.

AU - Kulessa, P.

AU - Kupsc, A.

AU - Kuzmin, A.

AU - Lalwani, K.

AU - Lersch, D.

AU - Lorentz, B.

AU - Magierae, A.

AU - Maier, R.

AU - Marciniewski, P.

AU - Marianski, B.

AU - Morsch, H. -P.

AU - Moskal, P.

AU - Ohm, H.

AU - del Rio, E. Perez

AU - Piskunov, N. M.

AU - Prasuhn, D.

AU - Pszczel, D.

AU - Pysz, K.

AU - Pyszniak, A.

AU - Ritman, J.

AU - Roy, A.

AU - Rudy, Z.

AU - Rundel, O.

AU - Sawant, S.

AU - Schadmand, S.

AU - Schaetti-Ozerianska, I.

AU - Sefzick, T.

AU - Serdyuk, V.

AU - Shwartz, B.

AU - Sitterberg, K.

AU - Skorodko, T.

AU - Skurzok, M.

AU - Smyrski, J.

AU - Sopov, V.

AU - Stassen, R.

AU - Stepaniak, J.

AU - Stephan, E.

AU - Sterzenbach, G.

AU - Stockhorst, H.

AU - Stroeher, H.

AU - Szczurek, A.

AU - Trzcinski, A.

AU - Varma, R.

AU - Wolke, M.

AU - Wronska, A.

AU - Wuestner, P.

AU - Yamamoto, A.

AU - Zabierowski, J.

AU - Zielinski, M. J.

AU - Zlomanczuk, J.

AU - Zupranski, P.

AU - Zurek, M.

PY - 2017/1/6

Y1 - 2017/1/6

N2 - The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.

AB - The search for He-4-eta bound states was performed with the WASA-at-COSY facility via the measurement of the excitation function for the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) processes. The deuteron beam momentum was varied continuously between 2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd -> He-4 eta reaction ranging from Q = 70 MeV to Q = 30 MeV. The luminosity was determined based on the dd -> (3)Hen reaction and the quasi-free proton proton scattering via dd -> ppn(spectator)n(spectator) reactions. The excitation functions, determined independently for the measured reactions, do not reveal a structure which could be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the total cross sections for the bound state production and decay in dd -> (4He-eta)(bound) -> (3)Hen pi(0) and dd -> (He-4-eta)(bound) -> (3)Hep pi(-) processes were determined taking into account the isospin relation between the both of the considered channels. The results of the analysis depend on the assumptions of the N* (1535) momentum distribution in the anticipated mesic-He-4. Assuming, as in the previous works, that this is identical with the distribution of nucleons bound with 20 MeV in He-4, we determined that (for the mesic bound state width in the range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about 3 nb and about 6 nb for n pi(0) and p pi(-) channels, respectively. However, based on the recent theoretical findings of the N*(1535) momentum distribution in the N*-He-3 nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector acceptance decreases and hence the corresponding upper limits are 5 nb and 10 nb for n pi(0) and p pi(-) channels respectively. (C) 2017 Elsevier B.V. All rights reserved.

KW - eta-Mesic nuclei

KW - eta meson

KW - QUASI-BOUND STATES

KW - NEAR-THRESHOLD

KW - NUCLEI

KW - SCATTERING

KW - DETECTOR

KW - SYSTEMS

U2 - 10.1016/j.nuclphysa.2017.01.001

DO - 10.1016/j.nuclphysa.2017.01.001

M3 - Article

VL - 959

SP - 102

EP - 115

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

ER -

Search for eta-mesic He-4 in the dd -> (3)Hen pi(0) and dd -> (3)Hep pi(-) reactions with the WASA-at-COSY facility

Abstract

Keywords

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