arXiv - PHYS - Nuclear Experiment最新文献

{"title":"Flattenicity as \"centrality\" estimator in p-Pb collisions simulated with PYTHIA 8.312 Angantyr","authors":"Antonio Ortiz, Gyula Bencedi, Feng Fan","doi":"arxiv-2407.07724","DOIUrl":"https://doi.org/arxiv-2407.07724","url":null,"abstract":"In this paper, a \"centrality\" estimator based on flattenicity ($rho$) is\u0000studied in proton-led (p-Pb) collisions at $sqrt{s_{rm NN}}=5.02$ TeV using\u0000PYTHIA 8 Angantyr. Although Angantyr is still under development, the existing\u0000implementation is enough to study the particle production in systems where\u0000medium effects are absent. Firstly, ALICE data on pseudorapidity distributions\u0000as a function of the forward multiplicity (V0M), as well as transverse momentum\u0000distributions of identified particles in non-single diffractive p-Pb\u0000collisions, are compared with Angantyr. Secondly, the average number of binary\u0000nucleon-nucleon ($N_{rm coll}$) collisions for different \"centrality\"\u0000estimators are compared. The studies include the following \"centrality\"\u0000estimators: V0M, $rho$ and midrapidity multiplicity (CL1). On one hand, the\u0000\"centrality\" dependence of $langle N_{rm coll} rangle$ for the $rho$\u0000selection shows the smallest deviations ($<8$ %) with respect to that obtained\u0000using impact parameter $b$; on the other hand, the V0M and CL1 yield huge\u0000deviations (up to a factor 2) with respect to the results using $b$. The\u0000particle ratios and nuclear modification factors ($Q_{rm pPb}$) as a function\u0000of $p_{rm T}$ are also studied. The proton-to-pion ratio exhibits a flow-like\u0000peak at intermediate $p_{rm T}$ (2-8 GeV/$c$) with little or no \"centrality\"\u0000dependence for V0M, $rho$ and $b$ selections. The kaon-to-pion ratio as a\u0000function of $p_{rm T}$ is \"centrality\" independent for the same selections. On\u0000the contrary, for the CL1 class the ratios exhibit the typical behaviour\u0000associated with hard physics. Regarding $Q_{rm pPb}$, a peak at intermediate\u0000$p_{rm T}$ ($2-8$ GeV/$c$) for different particle species is observed when the\u0000\"centrality\" is obtained with $b$ or $rho$. The observed features diminish for\u0000the selections based on V0M and CL1.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141588157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations","authors":"Claude Amsler, Horst Breuker, Marcus Bumbar, Matti Cerwenka, Giovanni Costantini, Rafael Ferragut, Markus Fleck, Marco Giammarchi, Angela Gligorova, Giulia Gosta, Eric David Hunter, Carina Killian, Bernadette Kolbinger, Viktoria Kraxberger, Naofumi Kuroda, Moritz Lackner, Marco Leali, Giancarlo Maero, Valerio Mascagna, Yasuyuki Matsuda, Stefano Migliorati, Daniel James Murtagh, Amit Nanda, Lilian Nowak, Simon Rheinfrank, Massimiliano Romé, Martin C. Simon, Minori Tajima, Valerio Toso, Stefan Ulmer, Martin van Beuzekom, Luca Venturelli, Alina Weiser, Eberhard Widmann, Yasunori Yamazaki, Johann Zmeskal","doi":"arxiv-2407.06721","DOIUrl":"https://doi.org/arxiv-2407.06721","url":null,"abstract":"The mechanism of antiproton-nucleus annihilation at rest is not fully\u0000understood, despite substantial previous experimental and theoretical work. In\u0000this study we used slow extracted, sub-keV antiprotons from the ASACUSA\u0000apparatus at CERN to measure the charged particle multiplicities and their\u0000energy deposits from antiproton annihilations at rest on three different\u0000nuclei: carbon, molybdenum and gold. The results are compared with predictions\u0000from different models in the simulation tools Geant4 and FLUKA. A model that\u0000accounts for all the observed features is still missing, as well as\u0000measurements at low energies, to validate such models.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"White Paper on Polarized Target Studies with Real Photons in Hall D","authors":"F. Afzal, M. M. Dalton, A. Deur, P. Hurck, C. D. Keith, V. Mathieu, S. Sirca, Z. Yu","doi":"arxiv-2407.06429","DOIUrl":"https://doi.org/arxiv-2407.06429","url":null,"abstract":"This white paper summarizes the Workshop on Polarized Target Studies with\u0000Real Photons in Hall D at Jefferson Lab, that took place on 21 February 2024.\u0000The Workshop included about 45 participants both online and in person at\u0000Florida State University in Tallahassee. Contributions describe the\u0000experimental infrastructure available in Hall D and potential physics\u0000applications. The rate and detection capabilities of Hall D are outlined, as\u0000well as the properties of a circularly polarized photon beam and a polarized\u0000target. Possible physics measurements include light and strange quark baryon\u0000spectroscopy, the GDH sum rule, proton structure accessed through measurement\u0000of Generalized Parton Distributions and modification of nucleon structure\u0000within the nuclear medium.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isochronous mass spectrometry at the RIKEN Rare-RI Ring facility","authors":"D. Nagae, S. Omika, Y. Abe, Y. Yamaguchi, F. Suzaki, K. Wakayama, N. Tadano, R. Igosawa, K. Inomata, H. Arakawa, K. Nishimuro, T. Fujii, T. Mitsui, T. Yamaguchi, T. Suzuki, S. Suzuki, T. Moriguchi, M. Amano, D. Kamioka, A. Ozawa, S. Naimi, Z. Ge, Y. Yanagisawa, H. Baba, S. Michimasa, S. Ota, G. Lorusso, Yu. A. Litvinov, M. Wakasugi, T. Uesaka, Y. Yano","doi":"arxiv-2407.05659","DOIUrl":"https://doi.org/arxiv-2407.05659","url":null,"abstract":"A dedicated isochronous storage ring, named the Rare-RI Ring, was constructed\u0000at the RI Beam Factory of RIKEN, aiming at precision mass measurements of\u0000nuclei located in uncharted territories of the nuclear chart. The Rare-RI Ring\u0000employs the isochronous mass spectrometry technique with the goal to achieve a\u0000relative mass precision of $10^{-6}$ within a measurement time of less than 1\u0000ms. The performance of the facility was demonstrated through mass measurements\u0000of neutron-rich nuclei with well-known masses. Velocity or magnetic rigidity is\u0000measured for every particle prior to its injection into the ring, wherein its\u0000revolution time is accurately determined. The latter quantity is used to\u0000determine the mass of the particle, while the former one is needed for\u0000non-isochronicity corrections. Mass precisions on the order of $10^{-5}$ were\u0000achieved in the first commissioning, which demonstrates that Rare-RI Ring is a\u0000powerful tool for mass spectrometry of short-lived nuclei.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement and analysis of the $^{246}$Cm and $^{248}$Cm neutron capture cross-sections at the EAR2 of the n TOF facility","authors":"V. Alcayne, A. Kimura, E. Mendoza, D. Cano-Ott, O. Aberle, F. Álvarez-Velarde, S. Amaducci, J. Andrzejewski, L. Audouin, V. Bécares, V. Babiano-Suarez, M. Bacak, M. Barbagallo, F. Bečvář, G. Bellia, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero-Ontanaya, F. Calviño, M. Calviani, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, L. A. Damone, M. Diakaki, M. Dietz, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, Z. Eleme, B. Fernández-Domınguez, A. Ferrari, P. Finocchiaro, V. Furman, K. Göbel, R. Garg, A. Gawlik-Ramiega, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, N. Kivel, M. Kokkoris, Y. Kopatch, M. Krtička, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. Lo Meo, S. J. Lonsdale, D. Macina, A. Manna, T. Martınez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, F. Matteucci, E. A. Maugeri, A. Mazzone, A. Mengoni, V. Michalopoulou, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, F. Ogállar, A. Oprea, N. Patronis, A. Pavlik, A. Pérez de Rada, J. Perkowski, L. Persanti, I. Porras, J. Praena, J. M. Quesada, D. Radeck, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, Y. Romanets, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, T. Talip, A. Tarifeño-Saldivia, L. Tassan-Got, P. Torres-Sánchez, A. Tsinganis, J. Ulrich, S. Urlass, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, P. J. Woods, T. Wright, P. Žugec","doi":"arxiv-2407.06377","DOIUrl":"https://doi.org/arxiv-2407.06377","url":null,"abstract":"The $^{246}$Cm(n,$gamma$) and $^{248}$Cm(n,$gamma$) cross-sections have\u0000been measured at the Experimental Area 2 (EAR2) of the n_TOF facility at CERN\u0000with three C$_6$D$_6$ detectors. This measurement is part of a collective\u0000effort to improve the capture cross-section data for Minor Actinides (MAs),\u0000which are required to estimate the production and transmutation rates of these\u0000isotopes in light water reactors and innovative reactor systems. In particular,\u0000the neutron capture in $^{246}$Cm and $^{248}$Cm open the path for the\u0000formation of other Cm isotopes and heavier elements such as Bk and Cf and the\u0000knowledge of (n,$gamma$) cross-sections of these Cm isotopes plays an\u0000important role in the transport, transmutation and storage of the spent nuclear\u0000fuel. The reactions $^{246}$Cm(n,$gamma$) and $^{248}$Cm(n,$gamma$) have been\u0000the two first capture measurements analyzed at n_TOF EAR2. Until this\u0000experiment and two recent measurements performed at J-PARC, there was only one\u0000set of data of the capture cross-sections of $^{246}$Cm and $^{248}$Cm, that\u0000was obtained in 1969 in an underground nuclear explosion experiment. In the\u0000measurement at n_TOF a total of 13 resonances of $^{246}$Cm between 4 and 400\u0000eV and 5 of $^{248}$Cm between 7 and 100 eV have been identified and fitted.\u0000The radiative kernels obtained for $^{246}$Cm are compatible with JENDL-5, but\u0000some of them are not with JENDL-4, which has been adopted by JEFF-3.3 and\u0000ENDF/B-VIII.0. The radiative kernels obtained for the first three $^{248}$Cm\u0000resonances are compatible with JENDL-5, however, the other two are not\u0000compatible with any other evaluation and are 20% and 60% larger than JENDL-5.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141577548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improved limit on neutrinoless double beta decay of mohundred~from AMoRE-I","authors":"A. Agrawal, V. V. Alenkov, P. Aryal, J. Beyer, B. Bhandari, R. S. Boiko, K. Boonin, O. Buzanov, C. R. Byeon, N. Chanthima, M. K. Cheoun, J. S. Choe, Seonho Choi, S. Choudhury, J. S. Chung, F. A. Danevich, M. Djamal, D. Drung, C. Enss, A. Fleischmann, A. M. Gangapshev, L. Gastaldo, Y. M. Gavrilyuk, A. M. Gezhaev, O. Gileva, V. D. Grigorieva, V. I. Gurentsov, C. Ha, D. H. Ha, E. J. Ha, D. H. Hwang, E. J. Jeon, J. A. Jeon, H. S. Jo, J. Kaewkhao, C. S. Kang, W. G. Kang, V. V. Kazalov, S. Kempf, A. Khan, S. Khan, D. Y. Kim, G. W. Kim, H. B. Kim, Ho-Jong Kim, H. J. Kim, H. L. Kim, H. S. Kim, M. B. Kim, S. C. Kim, S. K. Kim, S. R. Kim, W. T. Kim, Y. D. Kim, Y. H. Kim, K. Kirdsiri, Y. J. Ko, V. V. Kobychev, V. Kornoukhov, V. V. Kuzminov, D. H. Kwon, C. H. Lee, DongYeup Lee, E. K. Lee, H. J. Lee, H. S. Lee, J. Lee, J. Y. Lee, K. B. Lee, M. H. Lee, M. K. Lee, S. W. Lee, Y. C. Lee, D. S. Leonard, H. S. Lim, B. Mailyan, E. P. Makarov, P. Nyanda, Y. Oh, S. L. Olsen, S. I. Panasenko, H. K. Park, H. S. Park, K. S. Park, S. Y. Park, O. G. Polischuk, H. Prihtiadi, S. Ra, S. S. Ratkevich, G. Rooh, M. B. Sari, J. Seo, K. M. Seo, B. Sharma, K. A. Shin, V. N. Shlegel, K. Siyeon, J. So, N. V. Sokur, J. K. Son, J. W. Song, N. Srisittipokakun, V. I. Tretyak, R. Wirawan, K. R. Woo, H. J. Yeon, Y. S. Yoon, Q. Yue","doi":"arxiv-2407.05618","DOIUrl":"https://doi.org/arxiv-2407.05618","url":null,"abstract":"AMoRE searches for the signature of neutrinoless double beta decay of\u0000$^{100}$Mo with a 100 kg sample of enriched $^{100}$Mo. Scintillating molybdate\u0000crystals coupled with a metallic magnetic calorimeter operate at milli-Kelvin\u0000temperatures to measure the energy of electrons emitted in the decay. As a\u0000demonstration of the full-scale AMoRE, we conducted AMoRE-I, a pre-experiment\u0000with 18 molybdate crystals, at the Yangyang Underground Laboratory for over two\u0000years. The exposure was 8.02 kg$cdot$year (or 3.89\u0000kg$_{mathrm{^{100}Mo}}cdot$year) and the total background rate near the\u0000Q-value was 0.025 $pm$ 0.002 counts/keV/kg/year. We observed no indication of\u0000$0nubetabeta$ decay and report a new lower limit of the half-life of\u0000$^{100}$Mo $0nubetabeta$ decay as $\u0000T^{0nu}_{1/2}>3.0times10^{24}~mathrm{years}$ at 90% confidence level. The\u0000effective Majorana mass limit range is $m_{betabeta}<$(210--610) meV using\u0000nuclear matrix elements estimated in the framework of different models,\u0000including the recent shell model calculations.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disentangling sources of momentum fluctuations in Xe+Xe and Pb+Pb collisions with the ATLAS detector","authors":"ATLAS Collaboration","doi":"arxiv-2407.06413","DOIUrl":"https://doi.org/arxiv-2407.06413","url":null,"abstract":"High-energy nuclear collisions create a quark-gluon plasma, whose initial\u0000condition and subsequent expansion vary from event to event, impacting the\u0000distribution of the event-wise average transverse momentum\u0000($P([p_{mathrm{T}}])$). Distinguishing between contributions from fluctuations\u0000in the size of the nuclear overlap area (geometrical component) and other\u0000sources at fixed size (intrinsic component) presents a challenge. Here, these\u0000two components are distinguished by measuring the mean, variance, and skewness\u0000of $P([p_{mathrm{T}}])$ in $^{208}$Pb+$^{208}$Pb and $^{129}$Xe+$^{129}$Xe\u0000collisions at $sqrt{s_{{mathrm{NN}}}} = 5.02$ and 5.44 TeV, respectively,\u0000using the ATLAS detector at the LHC. All observables show distinct changes in\u0000behavior in ultra-central collisions, where the geometrical variations are\u0000suppressed as the overlap area reaches its maximum. These results demonstrate a\u0000new technique to disentangle geometrical and intrinsic fluctuations, enabling\u0000constraints on initial condition and properties of the quark-gluon plasma, such\u0000as the speed of sound.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-Neutron Adding on $^{34}$S","authors":"A. N. Kuchera, C. R. Hoffman, G. Ryan, I. B. D'Amato, O. M. Guarinello, P. S. Kielb, R. Aggarwal, S. Ajayi, A. L. Conley, I. Conroy, P. D. Cottle, J. C. Esparza, S. Genty, K. Hanselman, M. Heinze, D. Houlihan, B. Kelly, M. I. Khawaja, E. Lopez-Saavedra, G. W. McCann, A. B. Morelock, L. A. Riley, A. Sandrik, V. Sitaraman, M. Spieker, C. Wibisono, I. Wiedenhover","doi":"arxiv-2407.06030","DOIUrl":"https://doi.org/arxiv-2407.06030","url":null,"abstract":"Purpose: Single-neutron adding data was collected in order to determine the\u0000distribution of the single-neutron strength of the $0f_{7/2}$, $1p_{3/2}$,\u0000$1p_{1/2}$ and $0f_{5/2}$ orbitals outside of $Z=16, N=18$, $^{34}$S. Methods: The $^{34}$S($d$,$p$)$^{35}$S reaction has been measured at 8 MeV/u\u0000to investigate cross sections to excited states in $^{35}$S. Outgoing proton\u0000yields and momenta were analyzed by the Super-Enge Split-Pole Spectrograph in\u0000conjunction with the CeBrA demonstrator located at the John D. Fox Laboratory\u0000at Florida State University. Angular distributions were compared with Distorted\u0000Wave Born Approximation calculations in order to extract single-neutron\u0000spectroscopic overlaps. Results: Spectroscopic overlaps and strengths were determined for states in\u0000$^{35}$S up through 6~MeV in excitation energy. Each orbital was observed to\u0000have fragmented strength where a single level carried the majority. The\u0000single-neutron centroids of the $0f_{7/2}$, $1p_{3/2}$, $1p_{1/2}$ and\u0000$0f_{5/2}$ orbitals were determined to be $2360^{+90}_{-40}$~keV,\u0000$3280^{+80}_{-50}$~keV, $4780^{+60}_{-40}$~keV, and $gtrsim7500$~keV,\u0000respectively. Conclusion: A previous discrepancy in the literature with respect to\u0000distribution of the neutron $1p_{1/2}$ strength was resolved. The integration\u0000of the normalized spectroscopic strengths, up to 5.1~MeV in excitation energy,\u0000revealed fully-vacant occupancies for the $0f_{7/2}$, $1p_{3/2}$, and\u0000$1p_{1/2}$ orbitals, as expected. The spacing in the single-neutron energies\u0000highlighted a reduction in the traditional $N=28$ shell-gap, relative to both\u0000the $1p$ spin-orbit energy difference ($N=32$) and the lower limit on the\u0000$N=34$ shell spacing.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Search for nuclear modifications of B$^+$ meson production in pPb collisions at $sqrt{s_mathrm{NN}}$ = 8.16 TeV","authors":"CMS Collaboration","doi":"arxiv-2407.05402","DOIUrl":"https://doi.org/arxiv-2407.05402","url":null,"abstract":"Nuclear medium effects on B$^+$ meson production are studied using the\u0000binary-collision scaled cross section ratio between events of different\u0000multiplicities from proton-lead collisions. Data, collected by the CMS\u0000experiment in 2016 at a nucleon-nucleon center-of-mass energy of\u0000$sqrt{s_mathrm{NN}}$ = 8.16 TeV, corresponding to an integrated luminosity of\u0000175 nb$^{-1}$, were used. The scaling factors in the ratio are determined using\u0000a novel approach based on the Z $to$ $mu^+mu^-$ cross sections measured in\u0000the same events. The scaled ratio for B$^+$ is consistent with unity for all\u0000event multiplicities, putting stringent constraints on nuclear modification for\u0000heavy flavor.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isomer production studied with simultaneous decay curve analysis for alpha-particle induced reactions on natural platinum up to 29 MeV","authors":"Naohiko Otuka, Sandor Takacs, Masayuki Aikawa, Shuichiro Ebata, Hiromitsu Haba","doi":"arxiv-2407.05081","DOIUrl":"https://doi.org/arxiv-2407.05081","url":null,"abstract":"The isomeric ratios of $^{198}$Au, $^{197}$Hg and $^{195}$Hg produced by\u0000$alpha$-particle induced reactions on natural platinum were investigated\u0000experimentally up to 29 MeV by using the standard stacked foil activation\u0000technique and $gamma$-ray spectrometry. The isomeric ratios of $^{197}$Hg and\u0000$^{195}$Hg determined by the conventional activation cross section formula\u0000showed strong cooling time dependence. The time dependence was resolved by\u0000adjusting the isomeric transition branching ratios for the two isotopes within\u0000a simultaneous decay curve analysis framework. Our analysis suggests\u000094.5$pm$0.7% and 48.9$pm$1.8% as the isomeric transition branching ratios of\u0000$^{197m}$Hg (24 h) and $^{195m}$Hg (42 h), respectively. The isomeric ratios\u0000and independent production cross sections of $^{198}$Au, $^{197}$Hg, $^{195}$Hg\u0000and some other Hg, Au and Pt isotopes were also measured down to 6 MeV with\u0000these corrected isomeric transition branching ratios, and compared with\u0000predictions of statistical and pre-equilibrium models by TALYS-2.0 to discuss\u0000spin cuto? parameter dependence. We found the measured isomeric ratios are\u0000better predicted if we reduce the spin cuto? parameter to half or less from\u0000that estimated with the rigid body moment of inertia.","PeriodicalId":501206,"journal":{"name":"arXiv - PHYS - Nuclear Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141569030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}