Fri·Oct 15, 2021Friday·October 15, 2021

1. 01*

   Neutron transfer in ${}^9$Be + ${}^{159}$Tb system

   Malika Kaushik🇮🇳 · G. Gupta🇮🇳 · V.V. Parkar · S.K. Pandit🇮🇳 · Swati Thakur🇮🇳 · V. Nanal · A. Shrivastava🇮🇳 · R.G. Pillay🇮🇳 · H. Krishnamoorthy🇮🇳 · K. Mahata · S. Pal🇨🇦 · C.S. Palshetkar🇮🇳 · K. Ramachandran🇮🇳 · Pushpendra P. Singh🇮🇳

   One neutron stripping cross sections (${\sigma }_{-1n}$) are measured in ${}^9$Be+${}^{159}$Tb system in the energy range E${}_{cm}$/V${}_B$ $\sim$ 0.79 - 1.24 using offline gamma counting technique. The CRC model calculations including the ground state and the 2${}^{+}$ resonance state of ${}^8$Be, carried out using the FRESCO code, give a reasonable description of the measured data. In addition, comparisons of reduced 1n-stripping cross sections- ${\sigma }_{red}$ with ${}^9$Be for different target nuclei (A $\sim$150-200), and ${\sigma }_{red}$ for ${}^9$Be, ${}^6$Li with ${}^{159}$Tb target are presented. While no strong target dependence is observed with ${}^9$Be projectile, ${\sigma }_{red}$(${}^9$Be) is significantly larger than that for ${}^6$Li, which is consistent with the Q-value for transfer reactions and breakup threshold energy of projectiles.

   nucl-exnucl-thEPJA(2021)·6 citations
2. 02*

   Supernova Preshock Neutronization Burst as a Probe of Non-Standard Neutrino Interactions

   Xu-Run Huang🇨🇳 · Shuai Zha🇨🇳 · Lie-Wen Chen🇨🇳

   Core-collapse supernova (CCSN) provides a unique astrophysical site for studying neutrino-matter interactions. Prior to the shock-breakout neutrino burst during the collapse of the iron core, a preshock ${\nu }_e$ burst arises from the electron capture of nuclei and it is sensitive to the low-energy coherent elastic neutrino-nucleus scattering (CE$\nu$NS) which dominates the neutrino opacity. Since the CE$\nu$NS depends strongly on the non-standard neutrino interactions (NSI) which are completely beyond the standard model and yet to be determined, the detection of the preshock burst thus provides a clean way to extract the NSI information. Within the spherically symmetric general-relativistic hydrodynamic simulation for the CCSN, we investigate the NSI effects on the preshock burst. We find that the NSI can maximally enhance the peak luminosity of the preshock burst almost by a factor of three, reaching a value comparable with that of the shock-breakout burst. Future detection of the preshock burst will have critical implications on astrophysics, neutrino physics and physics beyond the standard model.

   ↳ astro-ph.HEhep-phnucl-exnucl-thApJL(2021)·6 citations
3. 03*

   Transverse single spin asymmetries of forward neutrons in $p$$+$$p$, $p$$+$Al, and $p$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV as a function of transverse and longitudinal momenta

   U.A. Acharya🇺🇸 · C. Aidala🇺🇸 · Y. Akiba🇯🇵 · M. Alfred🇺🇸 · V. Andrieux🇺🇸 · N. Apadula🇺🇸 · H. Asano🇯🇵 · B. Azmoun🇺🇸 · V. Babintsev🇷🇺 · N.S. Bandara🇺🇸 · K.N. Barish🇺🇸 · S. Bathe🇺🇸 and 300 other authors

   In 2015 the PHENIX collaboration at the Relativistic Heavy Ion Collider recorded $p$$+$$p$, $p$$+$Al, and $p$$+$Au collision data at center of mass energies of $\sqrt{s_{{}_{NN}}}=200$ GeV with the proton beam(s) transversely polarized. At very forward rapidities $\eta >6.8$ relative to the polarized proton beam, neutrons were detected either inclusively or in (anti)correlation with detector activity related to hard collisions. The resulting single spin asymmetries, that were previously reported, have now been extracted as a function of the transverse momentum of the neutron as well as its longitudinal momentum fraction $x_F$. The explicit kinematic dependence, combined with the correlation information allows for a closer look at the interplay of different mechanisms suggested to describe these asymmetries, such as hadronic interactions or electromagnetic interactions in ultra-peripheral collisions, UPC. Events that are correlated with a hard collision indeed display a mostly negative asymmetry that increases in magnitude as a function of transverse momentum with only little dependence on $x_F$. In contrast, events that are not likely to have emerged from a hard collision display positive asymmetries for the nuclear collisions with a kinematic dependence that resembles that of a UPC based model. Because the UPC interaction depends strongly on the charge of the nucleus, those effects are very small for $p$$+$$p$ collisions, moderate for $p$$+$Al collisions, and large for $p$$+$Au collisions.

   ↳ hep-exnucl-exPRD(2022)·8 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.