neutrons - 2025 ACF Fall

Tossup

Given these particles’ mean lifetime of 880 seconds (10[2])and the time from freeze-out (10[3])to the onset of (10[1])BBNS, (10[1])one can calculate (10[1])an abundance denoted Y. The timescale of these particles’ capture differentiates (10[1])two reactions that occur (10[1])in AGB (-5[1])stars and (10[1])during supernovae, (10[1]-5[1])called the s- and r-processes. (10[2]-5[2])A different particle (10[1]-5[2])decays into one of these (-5[1])particles (10[1]-5[1])in the first (10[1])step (-5[1])of the (10[1]-5[1])p-p chain. (10[1]-5[2])[emphasize] Above the Chandrasekhar (“chun-druh-SHAY-kur”) limit (-5[2])but (10[1])below the TOV (10[3])limit, these (10[2])particles’ (10[1]-5[1])degeneracy (10[2]-5[2])pressure (10[4]-5[4])keeps (10[1]-5[1])massive (10[1]-5[2])stars (10[1]-5[4])from (-5[1])turning (10[2]-5[1])into black (10[1])holes. (10[9]-5[1])Pulsars (10[1]-5[2])are (10[1])rapidly (10[1])rotating (10[1]-5[2])members (10[1])of a class (-5[1])of extremely (10[1])dense stars (10[3])made of these (10[1])particles. (10[16])For (10[1])10 (10[2])points, (10[1])name these (10[1])subatomic (10[1])particles (-5[1])with no (10[1])charge. (10[6])■END■ (10[35]0[2])

ANSWER: neutrons (Y is the fractional abundance of helium.)

= Average correct buzz position

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Buzzes

Player	Team	Opponent	Position	Value
Aaryan Sumesh	Berkeley Archer Queen	Berkeley Boss Bandit	7	10
Joseph Strom	Louisville B	Michigan B	7	10
Misty Chen	Purdue C	Indiana B	12	10
Jeremy Scurlock	Chipola College	Georgia Tech C	12	10
Nathan Whittington	Tennessee A	Georgia Tech F	12	10
Wesley Stine	Clemson A	Clemson C	16	10
Ethen Sun	Toronto C	Waterloo C	17	10
Kevin Hendargo	UCSD A	UCLA C	20	10
Advai Srinivasan	UC Irvine	UCLA B	31	10
Nick Machin	UCLA A	UCLA E	35	10
Taran Knutson	Michigan A	CWRU C	37	-5
Ethan Ma	Illinois Blue	Rose-Hulman A	39	10
Matthew Westley	Purdue A	Iowa A	41	10
Gabriel Nell	Cornell B	Cornell D	41	-5
Kevin Cronk	Virginia Tech C	UNC D	46	10
Ben Weng	Macalester	Wisconsin B	46	-5
Surya Dinesh	MIT A	Brandeis Beethoven	46	-5
Daniel Lu	Washington Pink	Alberta B	46	10
Thomas Wu	Berkeley Skeleton King	Stanford B	49	10
James Xiao	Toronto A	Toronto D	49	-5
Anne Fjeld	Alberta A	Washington Coho	49	-5
Jackson McDonald	Alabama A	Vanderbilt C	54	-5
Bonham Buchannon	Louisville D	Michigan D	55	-5
Camden Walker	WashU Grolars	Purdue B	55	10
Andrew Harms	Michigan State A	WVU B	58	10
Sai Subramanian	CWRU A	Ohio State D	59	-5
Zac Stapler	Pittsburgh	Louisville C	61	-5
Tri Lam	Washington Chum	Boise State	61	10
Meredith Onions	Iowa B	Illinois Canada	63	-5
Benjamin Turner	York	Edinburgh C	63	-5
Andreas Ktori	Durham A	Sheffield A	63	10
Daniel Abrams	Rutgers B	Penn	67	-5
Luke Sauer	Michigan Tech	Minnesota	67	-5
John Rootham	Ottawa D	McGill E	68	10
Eric Morshed	Johns Hopkins	Rowan	71	10
Matthew Kohn	Williams A	Boston College A	71	10
Shaya Farahmand	Georgia Tech B	Georgia A	71	10
Daniel Chen	Emory A	Auburn B	73	10
Antara Bhattacharya	Cambridge A	Imperial B	73	10
Platon Gorokhov	Toronto E	Toronto F	74	10
Nelson Adams-Riley	Sewanne	Mississippi State A	74	-5
Sicheng Jiang	Toronto H	Waterloo B	75	10
Pace Klein	CWRU B	Michigan C	75	10
Liam Rojas	Virginia A	William & Mary B	75	-5
Aarnav Vyas	Illinois Orange	Chicago B	75	-5
Lorie Au-Yeung	UCSC	Berkeley Little Prince	76	10
Alex Dzurick	William Woods University A	Indiana A	76	10
Madeline Strauss	Tufts A	Boston University B	76	-5
Devon Kumar	Tufts C	Dartmouth B	76	-5
Caleb Slusher	South Carolina A	Georgia Tech D	76	10
Darren Kellis	Vanderbilt A	Montevallo	76	-5
James Mogg	Birmingham	Cambridge E	76	10
Jolie Yeh	Warwick	Cardiff	76	-5
Fuller Wray	Virginia Tech A	William & Mary C	77	-5
Zaid Asif	NYU A	NYU B	77	10
Surya Donath	Stanford A	Berkeley Mighty Miner	78	10
Sarah Silverman	Claremont C	UCLA F	78	-5
Nitish Sudhakar	Georgia Tech A	Georgia Tech E	78	-5
Brendan Bridle	Queen's A	McMaster B	79	-5
Jesse Mindel	NCSU A	Liberty B	79	10
Henry Ding	Princeton	George Mason C	79	-5
Eames Weeks	Brown A	Brandeis Bach	79	-5
Steven Su	Harvard	Tufts B	79	-5
Ethan Ririe	UCSD B	USC A	80	-5
Nikola Wu	UCLA D	Claremont B	81	10
Miles Phillips	Florida Tech B	Florida B	81	-5
Stephen Donoghue	Sheffield B	Edinburgh D	81	10
James Haddix	Washington State	Washington Sockeye	83	10
Cranmer McGinn	McMaster C	Guelph A	84	10
Nishad Joshi	Kentucky	WVU A	84	10
Nathan Zhao	Maryland B	Lehigh B	84	10
Ian Saylor	Wisconsin A	Wisconsin C	84	10
Suyog Vibhuti	Washington Steelhead	Arizona State B	84	10
Vishnu Sharma	Texas	Washington Atlantic	84	10
Yoyo Liu	British Columbia C	Washington Masu	84	-5
Brayden Zhang	Vanderbilt B	Tennessee Tech	84	10
Ollie Glin-Conway	Imperial D	Southampton	84	10
Emilie Moore	RIT A	Cornell A	84	10
Elizabeth Ziberman	Stony Brook	Maryland A	85	-5
Ezra Hoogeveen	St. Thomas	Iowa State	85	-5
Peter Smith	Binghamton A	Binghamton C	85	10
Aidan Keenan	Rochester	ESF	86	10
Jacob Ergueta	Florida A	Florida Tech A	87	10
Chris Wang	Toronto B	Toronto G	88	-5
Jeremy Katen	George Mason A	Columbia B	88	10
Jack Meyers	Brown B	Amherst B	88	-5
Owen Gibbs	Boston College B	Dartmouth C	89	10
Charlie Weaver	Virginia Tech B	VCU A	92	-5
Will Barash	Brandeis Mozart	Dartmouth A	94	10
Winston Zuo	UC Santa Barbara	USC B	96	10
Oliver Thompson	CWRU D	Ohio State A	96	10
Alexander Rutten	Columbia A	Lehigh A	96	10
Jake Scoville	RIT B	Binghamton B	99	10
Jas Wang	UCLA F	Claremont C	100	10
Chris Chang	USC A	UCSD B	100	10
Charlie Ruff	McGill A	Carleton B	100	10
Susanna Liao	Waterloo A	Toronto I	100	10
Daniel Luebs	Michigan State B	Michigan State D	100	10
Ezra Zareba	UNC B	Liberty A	100	10
Vedang Singhal	UNC C	Tusculum A	100	10
Jason Lee	Rutgers A	Vassar B	100	10
William Henley	Illinois Champaign	Purdue D	100	10
Theodor Martin	WashU Grizzlers	Illinois Urbana	100	10
Luc Vulliez	Amherst A	Vermont A	100	10
Nikhil Nair	Boston University B	Tufts A	100	10
Brandon Wiltse	Washington Chinook	British Columbia A	100	10
Advaith Jagannath	Cambridge C	Oxford	100	10
Michael Shipman	Cambridge D	Imperial C	100	10
Anirudh Terdal	LSE	Bristol	100	10
Andrew McKenzie	Ohio State B	Michigan State C	101	10
Drake Smith	Carleton A	McGill C	102	10
Yishak Kelkay	ERAU Daytona A	South Florida A	102	10
Jacky Li	MIT B	Williams B	103	10
Alex Wong	Rutgers D	Maryland C	105	10
Nathan Woolery	Louisville C	Pittsburgh	106	10
Peyton Legg	UCF A	Florida State A	107	-5
James Headon	Edinburgh A	Durham D	109	10
Abhay Ariyapappillil	Ottawa B	Ottawa C	110	10
Bailey Lacefield	Toronto G	Toronto B	110	10
Leonard Castine	Penn	Rutgers B	110	10
Yvonne Pan	Amherst B	Brown B	110	10
Kenner Bailey	Boston University A	Williams C	110	10
Eric Zhu	Cornell D	Cornell B	110	10
Christian Humeniuk	McMaster A	Brock A	111	10
Michael Xu	McMaster B	Queen's A	111	10
Will Marcotte	Toronto D	Toronto A	111	10
Matthew Andersen	Florida B	Florida Tech B	111	10
Juan Landaeta	Florida State A	UCF A	111	10
Manobhiram Vegendla	Ohio State D	CWRU A	111	10
Arjun Saulnier	CWRU C	Michigan A	111	10
Jack Rabaut	Michigan D	Louisville D	111	10
Owen Banks	Duke A	JMU B	111	10
Walter Carson	NCSU B	JMU A	111	10
Fern Fang	VCU A	Virginia Tech B	111	10
William Erwin	William & Mary B	Virginia A	111	10
Cara Leonard	William & Mary C	Virginia Tech A	111	10
Brayden Whitlow	George Mason C	Princeton	111	10
Margaret Withers	George Mason B	Rutgers C	111	10
Xavier Bornhorst	Maryland A	Stony Brook	111	10
Yiwei Jiang	NYU C	Vassar A	111	0
Ben Schindelman	Vassar A	NYU C	111	10
Tishe Sonuga	Chicago B	Illinois Orange	111	10
Brian Qian	Illinois Canada	Iowa B	111	10
Henry L'Heureux	Minnesota	Michigan Tech	111	10
Drew Wetterlind	Iowa State	St. Thomas	111	10
Will Demos	Wisconsin B	Macalester	111	10
Nathaniel Martin	Brandeis Bach	Brown A	111	10
Kaitlyn Farrin	Brandeis Beethoven	MIT A	111	10
Jackson Price	Dartmouth B	Tufts C	111	10
Dylan Tanouye	Tufts B	Harvard	111	10
Logan Van Pelt	Washington Coho	Alberta A	111	0
Grace Lovitt	Washington Masu	British Columbia C	111	10
Will Hughes	Auburn A	Auburn C	111	10
Andrew Heller	Georgia Tech E	Georgia Tech A	111	10
Towery McNeil	Mississippi State A	Sewanne	111	10
Andrew Wilson	Montevallo	Vanderbilt A	111	10
Edward Zhang	Vanderbilt C	Alabama A	111	10
James Bramley	Durham C	Edinburgh B	111	10
Musa Ahmed	Edinburgh C	York	111	10
Aeron Wheel	Cardiff	Warwick	111	10

Summary

Tournament	Edition	TUH	Conv. %	Neg %	Average Buzz
UK (North)	UK	5	100%	20%	95.00
UK (South)	UK	7	100%	14%	92.00
Northern California	US	4	100%	0%	52.50
Southern California	US	7	100%	29%	66.14
Eastern Canada (1)	US	4	100%	0%	95.00
Eastern Canada (2)	US	9	100%	33%	88.11
Florida	US	4	100%	50%	102.75
Great Lakes	US	11	100%	36%	87.27
Lower Mid-Atlantic	US	9	100%	33%	97.78
Upper Mid-Atlantic	US	12	100%	25%	97.92
Midwest	US	9	100%	22%	71.67
North	US	4	100%	75%	104.25
Northeast	US	12	100%	50%	101.75
Pacific	US	8	88%	25%	81.29
Southeast	US	12	100%	33%	74.92
Upstate NY	US	5	100%	20%	92.80