1
|
Adamczewski-Musch J, Arnold O, Atomssa ET, Behnke C, Belounnas A, Belyaev A, Berger-Chen JC, Biernat J, Blanco A, Blume C, Böhmer M, Chernenko S, Chlad L, Chudoba P, Ciepał I, Deveaux C, Dittert D, Dreyer J, Epple E, Fabbietti L, Fateev O, Fonte P, Franco C, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Golubeva M, Greifenhagen R, Guber F, Gumberidze M, Harabasz S, Heinz T, Hennino T, Höhne C, Holzmann R, Ierusalimov A, Ivashkin A, Kämpfer B, Kardan B, Koenig I, Koenig W, Kolb BW, Korcyl G, Kornakov G, Kornas F, Kotte R, Kuboś J, Kugler A, Kunz T, Kurepin A, Kurilkin A, Kurilkin P, Ladygin V, Lalik R, Lapidus K, Lebedev A, Linev S, Lopes L, Lorenz M, Mahmoud T, Maier L, Malige A, Markert J, Maurus S, Metag V, Michel J, Mihaylov DM, Mikhaylov V, Morozov S, Müntz C, Münzer R, Naumann L, Nowakowski K, Parpottas Y, Pechenov V, Pechenova O, Petukhov O, Pietraszko J, Prozorov AP, Przygoda W, Ramstein B, Rathod N, Reshetin A, Rodriguez-Ramos P, Rost A, Sadovsky A, Salabura P, Scheib T, Schmidt-Sommerfeld K, Schuldes H, Schwab E, Scozzi F, Seck F, Sellheim P, Siebenson J, Silva L, Smyrski J, Spataro S, Spies S, Ströbele H, Stroth J, Strzempek P, Sturm C, Svoboda O, Szala M, Tlusty P, Traxler M, Tsertos H, Ungethüm C, Vázquez Doce O, Wagner V, Wendisch C, Wiebusch MG, Wirth J, Wójcik D, Zanevsky Y, Zumbruch P, Curceanu C, Piscicchia K, Scordo A. Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter. Phys Rev Lett 2019; 123:022002. [PMID: 31386541 DOI: 10.1103/physrevlett.123.022002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/29/2019] [Indexed: 06/10/2023]
Abstract
We present the first observation of K^{-} and ϕ absorption within nuclear matter by means of π^{-}-induced reactions on C and W targets at an incident beam momentum of 1.7 GeV/c studied with HADES at SIS18/GSI. The double ratio (K^{-}/K^{+})_{W}/(K^{-}/K^{+})_{C} is found to be 0.319±0.009(stat)_{-0.012}^{+0.014}(syst) indicating a larger absorption of K^{-} in heavier targets as compared to lighter ones. The measured ϕ/K^{-} ratios in π^{-}+C and π^{-}+W reactions within the HADES acceptance are found to be equal to 0.55±0.04(stat)_{-0.07}^{+0.06}(syst) and to 0.63±0.06(stat)_{-0.11}^{+0.11}(syst), respectively. The similar ratios measured in the two different reactions demonstrate for the first time experimentally that the dynamics of the ϕ meson in nuclear medium is strongly coupled to the K^{-} dynamics. The large difference in the ϕ production off C and W nuclei is discussed in terms of a strong ϕN in-medium coupling. These results are relevant for the description of heavy-ion collisions and the structure of neutron stars.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - C Curceanu
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
| | - K Piscicchia
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
- CENTRO FERMI - Museo Storico della Fisica e Centro Studi e Ricerche "Enrico Fermi", 00184 Rome, Italy
| | - A Scordo
- INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
| |
Collapse
|
2
|
Ramstein B, Adamczewski-Musch J, Arnold O, Arnoldi-Meadows B, Belounnas A, Belyaev A, Biernat J, Blanco A, Blume C, Böhmer M, Bordalo P, Chlad L, Chudoba P, Ciepał I, Deveaux C, Dittert D, Dreyer J, Fabbietti L, Fateev O, Fonte P, Franco C, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Gillitzer A, Golubeva M, Greifenhagen R, Guber F, Gumberidze M, Harabasz S, Heinz T, Hennino T, Himmelreich M, Höhne C, Holzmann R, Ierusalimov A, Ivanov V, Ivashkin A, Kämpfer B, Kajetanowicz M, Kampert KH, Karavicheva T, Kardan B, Khomyakov V, Koenig I, Koenig W, Korcyl G, Kornakov G, Kornas F, Kotte R, Kozela A, Kuboś J, Kugler A, Kunz T, Kurepin A, Kurilkin P, Kushpil V, Ladygin V, Lalik R, Lebedev A, Linev S, Liu M, Lopes L, Lorenz M, Lykasov G, Mahmoud T, Malakhov A, Markert J, Maurus S, Metag V, Michel J, Mihaylov D, Mikhaylov V, Morozov S, Müntz C, Naumann L, Nowakowski K, Parpottas Y, Patel V, Pauly C, Pechenov V, Pechenova O, Pereira A, Petousis V, Petukhov O, Pfeifer D, Pietraszko J, Przygoda W, Pysz K, Ramos S, Reshetin A, Ritman L, Rodriguez-Ramos P, Rost A, Sadovsky A, Salabura P, Scheib T, Schuldes H, Schwab E, Scozzi F, Seck F, Sellheim P, Selyuzhenkov I, Silva L, Smyrski J, Sobiella M, Spataro S, Spies S, Ströbele H, Stroth J, Strzempek P, Svoboda O, Szala M, Taranenko A, Tlusty P, Traxler M, Troyan A, Tsertos H, Wagner V, Wendisch C, Wiebusch M, Wintz P, Wirth J, Włoch B, Zhilin A, Zinchenko A, Zumbruch P, Zuschke M. Time-Like Baryon Transitions studies with HADES. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201919901008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The HADES collaboration uses the e+e− production as a probe of the resonance matter produced in collisions at incident energies of 1-3.5 GeV/nucleon at GSI. Elementary reactions provide useful references for these studies and give information on resonance Dalitz decays (R→Ne+e−). Such processes are sensitive to the structure of time-like electromagnetic baryon transitions in a kinematic range where (off-shell) vector mesons play a crucial role. Results obtained in proton-proton reactions and in a commissioning pion-beam experiment are reported and prospects for future pion beam experiments and for first hyperon Dalitz decay measurements are described. The connection with the investigations of medium effects to be continued with HADES in the next years at SIS18 and SIS100 is also discussed.
Collapse
|
3
|
Mikhaylov V, Kugler A, Kushpil V, Svoboda O, Tlustý P, Golubeva M, Guber F, Ivashkin A, Morozov S, Klochkov V, Selyuzhenkov I, Senger A. The very forward hadron calorimeter PSD for the future CBM@FAIR experiment. EPJ Web Conf 2019. [DOI: 10.1051/epjconf/201920411004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The Projectile Spectator Detector (PSD) of the CBM experiment at the future FAIR facility is a compensating lead-scintillator calorimeter designed to measure the energy distribution of the forward going projectile nucleons and nuclei fragments (reaction spectators) produced close to the beam rapidity. The detector performance for the centrality and reaction plane determination is reviewed based on Monte-Carlo simulations of gold-gold collisions by means of four different heavy-ion event generators. The PSD energy resolution and the linearity of the response measured at CERN PS for the PSD supermodule consisting of 9 modules are presented. Predictions of the calorimeter radiation conditions at CBM and response measurement of one PSD module equipped with neutron irradiated MPPCs used for the light read out are discussed.
Collapse
|
4
|
Fortney SM, Mikhaylov V, Lee SM, Kobzev Y, Gonzalez RR, Greenleaf JE. Body temperature and thermoregulation during submaximal exercise after 115-day spaceflight. Aviat Space Environ Med 1998; 69:137-141. [PMID: 9491252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
BACKGROUND Altered thermoregulation has been reported following spaceflight simulations (bed rest and water immersion) but has never been examined after actual spaceflight. HYPOTHESIS We tested the null hypothesis that body temperatures and heat loss responses during exercise would be similar before and after spaceflight. METHODS Two male crewmembers of the 115-d Mir 18 mission performed supine submaximal cycle exercise (20 min at 40% and 20 min at 65% of preflight VO2peak) once at 145-146 d preflight and once at 5 d postflight (R + 5). RESULTS After flight neither crewmember could complete the exercise protocol, stopping after 28-29 min. The core temperature (Tin, ingestible telemetry pill) at test termination was similar (37.8 degrees C for both subjects) pre- and postflight despite shorter postflight test duration. The slopes of the skin blood flow (laser Doppler)/Tin relationship (subject 1: 396 vs. 214; subject 2: 704 vs. 143% change Perfusion Unit/degree C), and the sweating rate (dew point hygrometry)/Tin relationship (subject 1: 6.3 vs. 2.0; subject 2: 4.6 vs. 0.7 mg.min-1.cm-2.degree C-1), were both reduced postflight without appreciable change in the Tin thresholds for sweating or skin blood flow. CONCLUSION In this preliminary report for two crewmembers, the sensitivity of the heat loss responses were reduced after long-duration spaceflight, resulting in a faster rate of rise in core temperature.
Collapse
Affiliation(s)
- S M Fortney
- NASA Johnson Space Center, Houston, TX 77058, USA
| | | | | | | | | | | |
Collapse
|